/* vi:set ts=8 sts=4 sw=4 noet:
 *
 * VIM - Vi IMproved	by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 * See README.txt for an overview of the Vim source code.
 */

/*
 * evalfunc.c: Builtin functions
 */
#define USING_FLOAT_STUFF

#include "vim.h"

#if defined(FEAT_EVAL) || defined(PROTO)

#ifdef VMS
#include <float.h>
#endif

#ifdef MACOS_X
#include <time.h> /* for time_t */
#endif

static char *e_listarg = N_("E686: Argument of %s must be a List");
static char *e_listblobarg = N_("E899: Argument of %s must be a List or Blob");
static char *e_stringreq = N_("E928: String required");
static char *e_invalwindow = N_("E957: Invalid window number");

#ifdef FEAT_FLOAT
static void f_abs(typval_T *argvars, typval_T *rettv);
static void f_acos(typval_T *argvars, typval_T *rettv);
#endif
static void f_add(typval_T *argvars, typval_T *rettv);
static void f_and(typval_T *argvars, typval_T *rettv);
static void f_append(typval_T *argvars, typval_T *rettv);
static void f_appendbufline(typval_T *argvars, typval_T *rettv);
static void f_argc(typval_T *argvars, typval_T *rettv);
static void f_argidx(typval_T *argvars, typval_T *rettv);
static void f_arglistid(typval_T *argvars, typval_T *rettv);
static void f_argv(typval_T *argvars, typval_T *rettv);
static void f_assert_beeps(typval_T *argvars, typval_T *rettv);
static void f_assert_equal(typval_T *argvars, typval_T *rettv);
static void f_assert_equalfile(typval_T *argvars, typval_T *rettv);
static void f_assert_exception(typval_T *argvars, typval_T *rettv);
static void f_assert_fails(typval_T *argvars, typval_T *rettv);
static void f_assert_false(typval_T *argvars, typval_T *rettv);
static void f_assert_inrange(typval_T *argvars, typval_T *rettv);
static void f_assert_match(typval_T *argvars, typval_T *rettv);
static void f_assert_notequal(typval_T *argvars, typval_T *rettv);
static void f_assert_notmatch(typval_T *argvars, typval_T *rettv);
static void f_assert_report(typval_T *argvars, typval_T *rettv);
static void f_assert_true(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_asin(typval_T *argvars, typval_T *rettv);
static void f_atan(typval_T *argvars, typval_T *rettv);
static void f_atan2(typval_T *argvars, typval_T *rettv);
#endif
static void f_browse(typval_T *argvars, typval_T *rettv);
static void f_browsedir(typval_T *argvars, typval_T *rettv);
static void f_bufexists(typval_T *argvars, typval_T *rettv);
static void f_buflisted(typval_T *argvars, typval_T *rettv);
static void f_bufloaded(typval_T *argvars, typval_T *rettv);
static void f_bufname(typval_T *argvars, typval_T *rettv);
static void f_bufnr(typval_T *argvars, typval_T *rettv);
static void f_bufwinid(typval_T *argvars, typval_T *rettv);
static void f_bufwinnr(typval_T *argvars, typval_T *rettv);
static void f_byte2line(typval_T *argvars, typval_T *rettv);
static void byteidx(typval_T *argvars, typval_T *rettv, int comp);
static void f_byteidx(typval_T *argvars, typval_T *rettv);
static void f_byteidxcomp(typval_T *argvars, typval_T *rettv);
static void f_call(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_ceil(typval_T *argvars, typval_T *rettv);
#endif
#ifdef FEAT_JOB_CHANNEL
static void f_ch_canread(typval_T *argvars, typval_T *rettv);
static void f_ch_close(typval_T *argvars, typval_T *rettv);
static void f_ch_close_in(typval_T *argvars, typval_T *rettv);
static void f_ch_evalexpr(typval_T *argvars, typval_T *rettv);
static void f_ch_evalraw(typval_T *argvars, typval_T *rettv);
static void f_ch_getbufnr(typval_T *argvars, typval_T *rettv);
static void f_ch_getjob(typval_T *argvars, typval_T *rettv);
static void f_ch_info(typval_T *argvars, typval_T *rettv);
static void f_ch_log(typval_T *argvars, typval_T *rettv);
static void f_ch_logfile(typval_T *argvars, typval_T *rettv);
static void f_ch_open(typval_T *argvars, typval_T *rettv);
static void f_ch_read(typval_T *argvars, typval_T *rettv);
static void f_ch_readblob(typval_T *argvars, typval_T *rettv);
static void f_ch_readraw(typval_T *argvars, typval_T *rettv);
static void f_ch_sendexpr(typval_T *argvars, typval_T *rettv);
static void f_ch_sendraw(typval_T *argvars, typval_T *rettv);
static void f_ch_setoptions(typval_T *argvars, typval_T *rettv);
static void f_ch_status(typval_T *argvars, typval_T *rettv);
#endif
static void f_changenr(typval_T *argvars, typval_T *rettv);
static void f_char2nr(typval_T *argvars, typval_T *rettv);
static void f_chdir(typval_T *argvars, typval_T *rettv);
static void f_cindent(typval_T *argvars, typval_T *rettv);
static void f_clearmatches(typval_T *argvars, typval_T *rettv);
static void f_col(typval_T *argvars, typval_T *rettv);
static void f_confirm(typval_T *argvars, typval_T *rettv);
static void f_copy(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_cos(typval_T *argvars, typval_T *rettv);
static void f_cosh(typval_T *argvars, typval_T *rettv);
#endif
static void f_count(typval_T *argvars, typval_T *rettv);
static void f_cscope_connection(typval_T *argvars, typval_T *rettv);
static void f_cursor(typval_T *argsvars, typval_T *rettv);
#ifdef MSWIN
static void f_debugbreak(typval_T *argvars, typval_T *rettv);
#endif
static void f_deepcopy(typval_T *argvars, typval_T *rettv);
static void f_delete(typval_T *argvars, typval_T *rettv);
static void f_deletebufline(typval_T *argvars, typval_T *rettv);
static void f_did_filetype(typval_T *argvars, typval_T *rettv);
static void f_diff_filler(typval_T *argvars, typval_T *rettv);
static void f_diff_hlID(typval_T *argvars, typval_T *rettv);
static void f_empty(typval_T *argvars, typval_T *rettv);
static void f_environ(typval_T *argvars, typval_T *rettv);
static void f_escape(typval_T *argvars, typval_T *rettv);
static void f_eval(typval_T *argvars, typval_T *rettv);
static void f_eventhandler(typval_T *argvars, typval_T *rettv);
static void f_executable(typval_T *argvars, typval_T *rettv);
static void f_execute(typval_T *argvars, typval_T *rettv);
static void f_exepath(typval_T *argvars, typval_T *rettv);
static void f_exists(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_exp(typval_T *argvars, typval_T *rettv);
#endif
static void f_expand(typval_T *argvars, typval_T *rettv);
static void f_extend(typval_T *argvars, typval_T *rettv);
static void f_feedkeys(typval_T *argvars, typval_T *rettv);
static void f_filereadable(typval_T *argvars, typval_T *rettv);
static void f_filewritable(typval_T *argvars, typval_T *rettv);
static void f_filter(typval_T *argvars, typval_T *rettv);
static void f_finddir(typval_T *argvars, typval_T *rettv);
static void f_findfile(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_float2nr(typval_T *argvars, typval_T *rettv);
static void f_floor(typval_T *argvars, typval_T *rettv);
static void f_fmod(typval_T *argvars, typval_T *rettv);
#endif
static void f_fnameescape(typval_T *argvars, typval_T *rettv);
static void f_fnamemodify(typval_T *argvars, typval_T *rettv);
static void f_foldclosed(typval_T *argvars, typval_T *rettv);
static void f_foldclosedend(typval_T *argvars, typval_T *rettv);
static void f_foldlevel(typval_T *argvars, typval_T *rettv);
static void f_foldtext(typval_T *argvars, typval_T *rettv);
static void f_foldtextresult(typval_T *argvars, typval_T *rettv);
static void f_foreground(typval_T *argvars, typval_T *rettv);
static void f_funcref(typval_T *argvars, typval_T *rettv);
static void f_function(typval_T *argvars, typval_T *rettv);
static void f_garbagecollect(typval_T *argvars, typval_T *rettv);
static void f_get(typval_T *argvars, typval_T *rettv);
static void f_getbufinfo(typval_T *argvars, typval_T *rettv);
static void f_getbufline(typval_T *argvars, typval_T *rettv);
static void f_getbufvar(typval_T *argvars, typval_T *rettv);
static void f_getchangelist(typval_T *argvars, typval_T *rettv);
static void f_getchar(typval_T *argvars, typval_T *rettv);
static void f_getcharmod(typval_T *argvars, typval_T *rettv);
static void f_getcharsearch(typval_T *argvars, typval_T *rettv);
static void f_getcmdline(typval_T *argvars, typval_T *rettv);
#if defined(FEAT_CMDL_COMPL)
static void f_getcompletion(typval_T *argvars, typval_T *rettv);
#endif
static void f_getcmdpos(typval_T *argvars, typval_T *rettv);
static void f_getcmdtype(typval_T *argvars, typval_T *rettv);
static void f_getcmdwintype(typval_T *argvars, typval_T *rettv);
static void f_getcwd(typval_T *argvars, typval_T *rettv);
static void f_getenv(typval_T *argvars, typval_T *rettv);
static void f_getfontname(typval_T *argvars, typval_T *rettv);
static void f_getfperm(typval_T *argvars, typval_T *rettv);
static void f_getfsize(typval_T *argvars, typval_T *rettv);
static void f_getftime(typval_T *argvars, typval_T *rettv);
static void f_getftype(typval_T *argvars, typval_T *rettv);
static void f_getjumplist(typval_T *argvars, typval_T *rettv);
static void f_getline(typval_T *argvars, typval_T *rettv);
static void f_getloclist(typval_T *argvars UNUSED, typval_T *rettv UNUSED);
static void f_getmatches(typval_T *argvars, typval_T *rettv);
static void f_getpid(typval_T *argvars, typval_T *rettv);
static void f_getcurpos(typval_T *argvars, typval_T *rettv);
static void f_getpos(typval_T *argvars, typval_T *rettv);
static void f_getqflist(typval_T *argvars, typval_T *rettv);
static void f_getreg(typval_T *argvars, typval_T *rettv);
static void f_getregtype(typval_T *argvars, typval_T *rettv);
static void f_gettabinfo(typval_T *argvars, typval_T *rettv);
static void f_gettabvar(typval_T *argvars, typval_T *rettv);
static void f_gettabwinvar(typval_T *argvars, typval_T *rettv);
static void f_gettagstack(typval_T *argvars, typval_T *rettv);
static void f_getwininfo(typval_T *argvars, typval_T *rettv);
static void f_getwinpos(typval_T *argvars, typval_T *rettv);
static void f_getwinposx(typval_T *argvars, typval_T *rettv);
static void f_getwinposy(typval_T *argvars, typval_T *rettv);
static void f_getwinvar(typval_T *argvars, typval_T *rettv);
static void f_glob(typval_T *argvars, typval_T *rettv);
static void f_globpath(typval_T *argvars, typval_T *rettv);
static void f_glob2regpat(typval_T *argvars, typval_T *rettv);
static void f_has(typval_T *argvars, typval_T *rettv);
static void f_has_key(typval_T *argvars, typval_T *rettv);
static void f_haslocaldir(typval_T *argvars, typval_T *rettv);
static void f_hasmapto(typval_T *argvars, typval_T *rettv);
static void f_histadd(typval_T *argvars, typval_T *rettv);
static void f_histdel(typval_T *argvars, typval_T *rettv);
static void f_histget(typval_T *argvars, typval_T *rettv);
static void f_histnr(typval_T *argvars, typval_T *rettv);
static void f_hlID(typval_T *argvars, typval_T *rettv);
static void f_hlexists(typval_T *argvars, typval_T *rettv);
static void f_hostname(typval_T *argvars, typval_T *rettv);
static void f_iconv(typval_T *argvars, typval_T *rettv);
static void f_indent(typval_T *argvars, typval_T *rettv);
static void f_index(typval_T *argvars, typval_T *rettv);
static void f_input(typval_T *argvars, typval_T *rettv);
static void f_inputdialog(typval_T *argvars, typval_T *rettv);
static void f_inputlist(typval_T *argvars, typval_T *rettv);
static void f_inputrestore(typval_T *argvars, typval_T *rettv);
static void f_inputsave(typval_T *argvars, typval_T *rettv);
static void f_inputsecret(typval_T *argvars, typval_T *rettv);
static void f_insert(typval_T *argvars, typval_T *rettv);
static void f_invert(typval_T *argvars, typval_T *rettv);
static void f_isdirectory(typval_T *argvars, typval_T *rettv);
static void f_islocked(typval_T *argvars, typval_T *rettv);
#if defined(FEAT_FLOAT) && defined(HAVE_MATH_H)
static void f_isinf(typval_T *argvars, typval_T *rettv);
static void f_isnan(typval_T *argvars, typval_T *rettv);
#endif
static void f_items(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_JOB_CHANNEL
static void f_job_getchannel(typval_T *argvars, typval_T *rettv);
static void f_job_info(typval_T *argvars, typval_T *rettv);
static void f_job_setoptions(typval_T *argvars, typval_T *rettv);
static void f_job_start(typval_T *argvars, typval_T *rettv);
static void f_job_stop(typval_T *argvars, typval_T *rettv);
static void f_job_status(typval_T *argvars, typval_T *rettv);
#endif
static void f_join(typval_T *argvars, typval_T *rettv);
static void f_js_decode(typval_T *argvars, typval_T *rettv);
static void f_js_encode(typval_T *argvars, typval_T *rettv);
static void f_json_decode(typval_T *argvars, typval_T *rettv);
static void f_json_encode(typval_T *argvars, typval_T *rettv);
static void f_keys(typval_T *argvars, typval_T *rettv);
static void f_last_buffer_nr(typval_T *argvars, typval_T *rettv);
static void f_len(typval_T *argvars, typval_T *rettv);
static void f_libcall(typval_T *argvars, typval_T *rettv);
static void f_libcallnr(typval_T *argvars, typval_T *rettv);
static void f_line(typval_T *argvars, typval_T *rettv);
static void f_line2byte(typval_T *argvars, typval_T *rettv);
static void f_lispindent(typval_T *argvars, typval_T *rettv);
static void f_list2str(typval_T *argvars, typval_T *rettv);
static void f_localtime(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_log(typval_T *argvars, typval_T *rettv);
static void f_log10(typval_T *argvars, typval_T *rettv);
#endif
#ifdef FEAT_LUA
static void f_luaeval(typval_T *argvars, typval_T *rettv);
#endif
static void f_map(typval_T *argvars, typval_T *rettv);
static void f_maparg(typval_T *argvars, typval_T *rettv);
static void f_mapcheck(typval_T *argvars, typval_T *rettv);
static void f_match(typval_T *argvars, typval_T *rettv);
static void f_matchadd(typval_T *argvars, typval_T *rettv);
static void f_matchaddpos(typval_T *argvars, typval_T *rettv);
static void f_matcharg(typval_T *argvars, typval_T *rettv);
static void f_matchdelete(typval_T *argvars, typval_T *rettv);
static void f_matchend(typval_T *argvars, typval_T *rettv);
static void f_matchlist(typval_T *argvars, typval_T *rettv);
static void f_matchstr(typval_T *argvars, typval_T *rettv);
static void f_matchstrpos(typval_T *argvars, typval_T *rettv);
static void f_max(typval_T *argvars, typval_T *rettv);
static void f_min(typval_T *argvars, typval_T *rettv);
#ifdef vim_mkdir
static void f_mkdir(typval_T *argvars, typval_T *rettv);
#endif
static void f_mode(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_MZSCHEME
static void f_mzeval(typval_T *argvars, typval_T *rettv);
#endif
static void f_nextnonblank(typval_T *argvars, typval_T *rettv);
static void f_nr2char(typval_T *argvars, typval_T *rettv);
static void f_or(typval_T *argvars, typval_T *rettv);
static void f_pathshorten(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_pow(typval_T *argvars, typval_T *rettv);
#endif
static void f_prevnonblank(typval_T *argvars, typval_T *rettv);
static void f_printf(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_JOB_CHANNEL
static void f_prompt_setcallback(typval_T *argvars, typval_T *rettv);
static void f_prompt_setinterrupt(typval_T *argvars, typval_T *rettv);
static void f_prompt_setprompt(typval_T *argvars, typval_T *rettv);
#endif
static void f_pumvisible(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_PYTHON3
static void f_py3eval(typval_T *argvars, typval_T *rettv);
#endif
#ifdef FEAT_PYTHON
static void f_pyeval(typval_T *argvars, typval_T *rettv);
#endif
#if defined(FEAT_PYTHON) || defined(FEAT_PYTHON3)
static void f_pyxeval(typval_T *argvars, typval_T *rettv);
#endif
static void f_range(typval_T *argvars, typval_T *rettv);
static void f_readdir(typval_T *argvars, typval_T *rettv);
static void f_readfile(typval_T *argvars, typval_T *rettv);
static void f_reg_executing(typval_T *argvars, typval_T *rettv);
static void f_reg_recording(typval_T *argvars, typval_T *rettv);
static void f_reltime(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_reltimefloat(typval_T *argvars, typval_T *rettv);
#endif
static void f_reltimestr(typval_T *argvars, typval_T *rettv);
static void f_remote_expr(typval_T *argvars, typval_T *rettv);
static void f_remote_foreground(typval_T *argvars, typval_T *rettv);
static void f_remote_peek(typval_T *argvars, typval_T *rettv);
static void f_remote_read(typval_T *argvars, typval_T *rettv);
static void f_remote_send(typval_T *argvars, typval_T *rettv);
static void f_remote_startserver(typval_T *argvars, typval_T *rettv);
static void f_remove(typval_T *argvars, typval_T *rettv);
static void f_rename(typval_T *argvars, typval_T *rettv);
static void f_repeat(typval_T *argvars, typval_T *rettv);
static void f_resolve(typval_T *argvars, typval_T *rettv);
static void f_reverse(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_round(typval_T *argvars, typval_T *rettv);
#endif
static void f_screenattr(typval_T *argvars, typval_T *rettv);
static void f_screenchar(typval_T *argvars, typval_T *rettv);
static void f_screenchars(typval_T *argvars, typval_T *rettv);
static void f_screencol(typval_T *argvars, typval_T *rettv);
static void f_screenrow(typval_T *argvars, typval_T *rettv);
static void f_screenstring(typval_T *argvars, typval_T *rettv);
static void f_search(typval_T *argvars, typval_T *rettv);
static void f_searchdecl(typval_T *argvars, typval_T *rettv);
static void f_searchpair(typval_T *argvars, typval_T *rettv);
static void f_searchpairpos(typval_T *argvars, typval_T *rettv);
static void f_searchpos(typval_T *argvars, typval_T *rettv);
static void f_server2client(typval_T *argvars, typval_T *rettv);
static void f_serverlist(typval_T *argvars, typval_T *rettv);
static void f_setbufline(typval_T *argvars, typval_T *rettv);
static void f_setbufvar(typval_T *argvars, typval_T *rettv);
static void f_setcharsearch(typval_T *argvars, typval_T *rettv);
static void f_setcmdpos(typval_T *argvars, typval_T *rettv);
static void f_setenv(typval_T *argvars, typval_T *rettv);
static void f_setfperm(typval_T *argvars, typval_T *rettv);
static void f_setline(typval_T *argvars, typval_T *rettv);
static void f_setloclist(typval_T *argvars, typval_T *rettv);
static void f_setmatches(typval_T *argvars, typval_T *rettv);
static void f_setpos(typval_T *argvars, typval_T *rettv);
static void f_setqflist(typval_T *argvars, typval_T *rettv);
static void f_setreg(typval_T *argvars, typval_T *rettv);
static void f_settabvar(typval_T *argvars, typval_T *rettv);
static void f_settabwinvar(typval_T *argvars, typval_T *rettv);
static void f_settagstack(typval_T *argvars, typval_T *rettv);
static void f_setwinvar(typval_T *argvars, typval_T *rettv);
static void f_shellescape(typval_T *argvars, typval_T *rettv);
static void f_shiftwidth(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_SIGNS
static void f_sign_define(typval_T *argvars, typval_T *rettv);
static void f_sign_getdefined(typval_T *argvars, typval_T *rettv);
static void f_sign_getplaced(typval_T *argvars, typval_T *rettv);
static void f_sign_jump(typval_T *argvars, typval_T *rettv);
static void f_sign_place(typval_T *argvars, typval_T *rettv);
static void f_sign_undefine(typval_T *argvars, typval_T *rettv);
static void f_sign_unplace(typval_T *argvars, typval_T *rettv);
#endif
static void f_simplify(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_sin(typval_T *argvars, typval_T *rettv);
static void f_sinh(typval_T *argvars, typval_T *rettv);
#endif
static void f_sort(typval_T *argvars, typval_T *rettv);
static void f_soundfold(typval_T *argvars, typval_T *rettv);
static void f_spellbadword(typval_T *argvars, typval_T *rettv);
static void f_spellsuggest(typval_T *argvars, typval_T *rettv);
static void f_split(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_sqrt(typval_T *argvars, typval_T *rettv);
static void f_str2float(typval_T *argvars, typval_T *rettv);
#endif
static void f_str2list(typval_T *argvars, typval_T *rettv);
static void f_str2nr(typval_T *argvars, typval_T *rettv);
static void f_strchars(typval_T *argvars, typval_T *rettv);
#ifdef HAVE_STRFTIME
static void f_strftime(typval_T *argvars, typval_T *rettv);
#endif
static void f_strgetchar(typval_T *argvars, typval_T *rettv);
static void f_stridx(typval_T *argvars, typval_T *rettv);
static void f_strlen(typval_T *argvars, typval_T *rettv);
static void f_strcharpart(typval_T *argvars, typval_T *rettv);
static void f_strpart(typval_T *argvars, typval_T *rettv);
static void f_strridx(typval_T *argvars, typval_T *rettv);
static void f_strtrans(typval_T *argvars, typval_T *rettv);
static void f_strdisplaywidth(typval_T *argvars, typval_T *rettv);
static void f_strwidth(typval_T *argvars, typval_T *rettv);
static void f_submatch(typval_T *argvars, typval_T *rettv);
static void f_substitute(typval_T *argvars, typval_T *rettv);
static void f_swapinfo(typval_T *argvars, typval_T *rettv);
static void f_swapname(typval_T *argvars, typval_T *rettv);
static void f_synID(typval_T *argvars, typval_T *rettv);
static void f_synIDattr(typval_T *argvars, typval_T *rettv);
static void f_synIDtrans(typval_T *argvars, typval_T *rettv);
static void f_synstack(typval_T *argvars, typval_T *rettv);
static void f_synconcealed(typval_T *argvars, typval_T *rettv);
static void f_system(typval_T *argvars, typval_T *rettv);
static void f_systemlist(typval_T *argvars, typval_T *rettv);
static void f_tabpagebuflist(typval_T *argvars, typval_T *rettv);
static void f_tabpagenr(typval_T *argvars, typval_T *rettv);
static void f_tabpagewinnr(typval_T *argvars, typval_T *rettv);
static void f_taglist(typval_T *argvars, typval_T *rettv);
static void f_tagfiles(typval_T *argvars, typval_T *rettv);
static void f_tempname(typval_T *argvars, typval_T *rettv);
static void f_test_alloc_fail(typval_T *argvars, typval_T *rettv);
static void f_test_autochdir(typval_T *argvars, typval_T *rettv);
static void f_test_feedinput(typval_T *argvars, typval_T *rettv);
static void f_test_getvalue(typval_T *argvars, typval_T *rettv);
static void f_test_option_not_set(typval_T *argvars, typval_T *rettv);
static void f_test_override(typval_T *argvars, typval_T *rettv);
static void f_test_refcount(typval_T *argvars, typval_T *rettv);
static void f_test_garbagecollect_now(typval_T *argvars, typval_T *rettv);
static void f_test_ignore_error(typval_T *argvars, typval_T *rettv);
static void f_test_null_blob(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_JOB_CHANNEL
static void f_test_null_channel(typval_T *argvars, typval_T *rettv);
#endif
static void f_test_null_dict(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_JOB_CHANNEL
static void f_test_null_job(typval_T *argvars, typval_T *rettv);
#endif
static void f_test_null_list(typval_T *argvars, typval_T *rettv);
static void f_test_null_partial(typval_T *argvars, typval_T *rettv);
static void f_test_null_string(typval_T *argvars, typval_T *rettv);
static void f_test_settime(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_tan(typval_T *argvars, typval_T *rettv);
static void f_tanh(typval_T *argvars, typval_T *rettv);
#endif
#ifdef FEAT_TIMERS
static void f_timer_info(typval_T *argvars, typval_T *rettv);
static void f_timer_pause(typval_T *argvars, typval_T *rettv);
static void f_timer_start(typval_T *argvars, typval_T *rettv);
static void f_timer_stop(typval_T *argvars, typval_T *rettv);
static void f_timer_stopall(typval_T *argvars, typval_T *rettv);
#endif
static void f_tolower(typval_T *argvars, typval_T *rettv);
static void f_toupper(typval_T *argvars, typval_T *rettv);
static void f_tr(typval_T *argvars, typval_T *rettv);
static void f_trim(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_trunc(typval_T *argvars, typval_T *rettv);
#endif
static void f_type(typval_T *argvars, typval_T *rettv);
static void f_undofile(typval_T *argvars, typval_T *rettv);
static void f_undotree(typval_T *argvars, typval_T *rettv);
static void f_uniq(typval_T *argvars, typval_T *rettv);
static void f_values(typval_T *argvars, typval_T *rettv);
static void f_virtcol(typval_T *argvars, typval_T *rettv);
static void f_visualmode(typval_T *argvars, typval_T *rettv);
static void f_wildmenumode(typval_T *argvars, typval_T *rettv);
static void f_win_execute(typval_T *argvars, typval_T *rettv);
static void f_win_findbuf(typval_T *argvars, typval_T *rettv);
static void f_win_getid(typval_T *argvars, typval_T *rettv);
static void f_win_gotoid(typval_T *argvars, typval_T *rettv);
static void f_win_id2tabwin(typval_T *argvars, typval_T *rettv);
static void f_win_id2win(typval_T *argvars, typval_T *rettv);
static void f_win_screenpos(typval_T *argvars, typval_T *rettv);
static void f_winbufnr(typval_T *argvars, typval_T *rettv);
static void f_wincol(typval_T *argvars, typval_T *rettv);
static void f_winheight(typval_T *argvars, typval_T *rettv);
static void f_winlayout(typval_T *argvars, typval_T *rettv);
static void f_winline(typval_T *argvars, typval_T *rettv);
static void f_winnr(typval_T *argvars, typval_T *rettv);
static void f_winrestcmd(typval_T *argvars, typval_T *rettv);
static void f_winrestview(typval_T *argvars, typval_T *rettv);
static void f_winsaveview(typval_T *argvars, typval_T *rettv);
static void f_winwidth(typval_T *argvars, typval_T *rettv);
static void f_writefile(typval_T *argvars, typval_T *rettv);
static void f_wordcount(typval_T *argvars, typval_T *rettv);
static void f_xor(typval_T *argvars, typval_T *rettv);

/*
 * Array with names and number of arguments of all internal functions
 * MUST BE KEPT SORTED IN strcmp() ORDER FOR BINARY SEARCH!
 */
static struct fst
{
  char *f_name;    /* function name */
  char f_min_argc; /* minimal number of arguments */
  char f_max_argc; /* maximal number of arguments */
  void (*f_func)(typval_T *args, typval_T *rvar);
  /* implementation of function */
} functions[] =
    {
#ifdef FEAT_FLOAT
        {"abs", 1, 1, f_abs},
        {"acos", 1, 1, f_acos}, /* WJMc */
#endif
        {"add", 2, 2, f_add},
        {"and", 2, 2, f_and},
        {"append", 2, 2, f_append},
        {"appendbufline", 3, 3, f_appendbufline},
        {"argc", 0, 1, f_argc},
        {"argidx", 0, 0, f_argidx},
        {"arglistid", 0, 2, f_arglistid},
        {"argv", 0, 2, f_argv},
#ifdef FEAT_FLOAT
        {"asin", 1, 1, f_asin}, /* WJMc */
#endif
        {"assert_beeps", 1, 2, f_assert_beeps},
        {"assert_equal", 2, 3, f_assert_equal},
        {"assert_equalfile", 2, 2, f_assert_equalfile},
        {"assert_exception", 1, 2, f_assert_exception},
        {"assert_fails", 1, 3, f_assert_fails},
        {"assert_false", 1, 2, f_assert_false},
        {"assert_inrange", 3, 4, f_assert_inrange},
        {"assert_match", 2, 3, f_assert_match},
        {"assert_notequal", 2, 3, f_assert_notequal},
        {"assert_notmatch", 2, 3, f_assert_notmatch},
        {"assert_report", 1, 1, f_assert_report},
        {"assert_true", 1, 2, f_assert_true},
#ifdef FEAT_FLOAT
        {"atan", 1, 1, f_atan},
        {"atan2", 2, 2, f_atan2},
#endif
        {"browse", 4, 4, f_browse},
        {"browsedir", 2, 2, f_browsedir},
        {"bufexists", 1, 1, f_bufexists},
        {"buffer_exists", 1, 1, f_bufexists}, /* obsolete */
        {"buffer_name", 1, 1, f_bufname},     /* obsolete */
        {"buffer_number", 1, 1, f_bufnr},     /* obsolete */
        {"buflisted", 1, 1, f_buflisted},
        {"bufloaded", 1, 1, f_bufloaded},
        {"bufname", 1, 1, f_bufname},
        {"bufnr", 1, 2, f_bufnr},
        {"bufwinid", 1, 1, f_bufwinid},
        {"bufwinnr", 1, 1, f_bufwinnr},
        {"byte2line", 1, 1, f_byte2line},
        {"byteidx", 2, 2, f_byteidx},
        {"byteidxcomp", 2, 2, f_byteidxcomp},
        {"call", 2, 3, f_call},
#ifdef FEAT_FLOAT
        {"ceil", 1, 1, f_ceil},
#endif
#ifdef FEAT_JOB_CHANNEL
        {"ch_canread", 1, 1, f_ch_canread},
        {"ch_close", 1, 1, f_ch_close},
        {"ch_close_in", 1, 1, f_ch_close_in},
        {"ch_evalexpr", 2, 3, f_ch_evalexpr},
        {"ch_evalraw", 2, 3, f_ch_evalraw},
        {"ch_getbufnr", 2, 2, f_ch_getbufnr},
        {"ch_getjob", 1, 1, f_ch_getjob},
        {"ch_info", 1, 1, f_ch_info},
        {"ch_log", 1, 2, f_ch_log},
        {"ch_logfile", 1, 2, f_ch_logfile},
        {"ch_open", 1, 2, f_ch_open},
        {"ch_read", 1, 2, f_ch_read},
        {"ch_readblob", 1, 2, f_ch_readblob},
        {"ch_readraw", 1, 2, f_ch_readraw},
        {"ch_sendexpr", 2, 3, f_ch_sendexpr},
        {"ch_sendraw", 2, 3, f_ch_sendraw},
        {"ch_setoptions", 2, 2, f_ch_setoptions},
        {"ch_status", 1, 2, f_ch_status},
#endif
        {"changenr", 0, 0, f_changenr},
        {"char2nr", 1, 2, f_char2nr},
        {"chdir", 1, 1, f_chdir},
        {"cindent", 1, 1, f_cindent},
        {"clearmatches", 0, 1, f_clearmatches},
        {"col", 1, 1, f_col},
        {"confirm", 1, 4, f_confirm},
        {"copy", 1, 1, f_copy},
#ifdef FEAT_FLOAT
        {"cos", 1, 1, f_cos},
        {"cosh", 1, 1, f_cosh},
#endif
        {"count", 2, 4, f_count},
        {"cscope_connection", 0, 3, f_cscope_connection},
        {"cursor", 1, 3, f_cursor},
#ifdef MSWIN
        {"debugbreak", 1, 1, f_debugbreak},
#endif
        {"deepcopy", 1, 2, f_deepcopy},
        {"delete", 1, 2, f_delete},
        {"deletebufline", 2, 3, f_deletebufline},
        {"did_filetype", 0, 0, f_did_filetype},
        {"diff_filler", 1, 1, f_diff_filler},
        {"diff_hlID", 2, 2, f_diff_hlID},
        {"empty", 1, 1, f_empty},
        {"environ", 0, 0, f_environ},
        {"escape", 2, 2, f_escape},
        {"eval", 1, 1, f_eval},
        {"eventhandler", 0, 0, f_eventhandler},
        {"executable", 1, 1, f_executable},
        {"execute", 1, 2, f_execute},
        {"exepath", 1, 1, f_exepath},
        {"exists", 1, 1, f_exists},
#ifdef FEAT_FLOAT
        {"exp", 1, 1, f_exp},
#endif
        {"expand", 1, 3, f_expand},
        {"extend", 2, 3, f_extend},
        {"feedkeys", 1, 2, f_feedkeys},
        {"file_readable", 1, 1, f_filereadable}, /* obsolete */
        {"filereadable", 1, 1, f_filereadable},
        {"filewritable", 1, 1, f_filewritable},
        {"filter", 2, 2, f_filter},
        {"finddir", 1, 3, f_finddir},
        {"findfile", 1, 3, f_findfile},
#ifdef FEAT_FLOAT
        {"float2nr", 1, 1, f_float2nr},
        {"floor", 1, 1, f_floor},
        {"fmod", 2, 2, f_fmod},
#endif
        {"fnameescape", 1, 1, f_fnameescape},
        {"fnamemodify", 2, 2, f_fnamemodify},
        {"foldclosed", 1, 1, f_foldclosed},
        {"foldclosedend", 1, 1, f_foldclosedend},
        {"foldlevel", 1, 1, f_foldlevel},
        {"foldtext", 0, 0, f_foldtext},
        {"foldtextresult", 1, 1, f_foldtextresult},
        {"foreground", 0, 0, f_foreground},
        {"funcref", 1, 3, f_funcref},
        {"function", 1, 3, f_function},
        {"garbagecollect", 0, 1, f_garbagecollect},
        {"get", 2, 3, f_get},
        {"getbufinfo", 0, 1, f_getbufinfo},
        {"getbufline", 2, 3, f_getbufline},
        {"getbufvar", 2, 3, f_getbufvar},
        {"getchangelist", 1, 1, f_getchangelist},
        {"getchar", 0, 1, f_getchar},
        {"getcharmod", 0, 0, f_getcharmod},
        {"getcharsearch", 0, 0, f_getcharsearch},
        {"getcmdline", 0, 0, f_getcmdline},
        {"getcmdpos", 0, 0, f_getcmdpos},
        {"getcmdtype", 0, 0, f_getcmdtype},
        {"getcmdwintype", 0, 0, f_getcmdwintype},
#if defined(FEAT_CMDL_COMPL)
        {"getcompletion", 2, 3, f_getcompletion},
#endif
        {"getcurpos", 0, 0, f_getcurpos},
        {"getcwd", 0, 2, f_getcwd},
        {"getenv", 1, 1, f_getenv},
        {"getfontname", 0, 1, f_getfontname},
        {"getfperm", 1, 1, f_getfperm},
        {"getfsize", 1, 1, f_getfsize},
        {"getftime", 1, 1, f_getftime},
        {"getftype", 1, 1, f_getftype},
        {"getjumplist", 0, 2, f_getjumplist},
        {"getline", 1, 2, f_getline},
        {"getloclist", 1, 2, f_getloclist},
        {"getmatches", 0, 1, f_getmatches},
        {"getpid", 0, 0, f_getpid},
        {"getpos", 1, 1, f_getpos},
        {"getqflist", 0, 1, f_getqflist},
        {"getreg", 0, 3, f_getreg},
        {"getregtype", 0, 1, f_getregtype},
        {"gettabinfo", 0, 1, f_gettabinfo},
        {"gettabvar", 2, 3, f_gettabvar},
        {"gettabwinvar", 3, 4, f_gettabwinvar},
        {"gettagstack", 0, 1, f_gettagstack},
        {"getwininfo", 0, 1, f_getwininfo},
        {"getwinpos", 0, 1, f_getwinpos},
        {"getwinposx", 0, 0, f_getwinposx},
        {"getwinposy", 0, 0, f_getwinposy},
        {"getwinvar", 2, 3, f_getwinvar},
        {"glob", 1, 4, f_glob},
        {"glob2regpat", 1, 1, f_glob2regpat},
        {"globpath", 2, 5, f_globpath},
        {"has", 1, 1, f_has},
        {"has_key", 2, 2, f_has_key},
        {"haslocaldir", 0, 2, f_haslocaldir},
        {"hasmapto", 1, 3, f_hasmapto},
        {"highlightID", 1, 1, f_hlID},          /* obsolete */
        {"highlight_exists", 1, 1, f_hlexists}, /* obsolete */
        {"histadd", 2, 2, f_histadd},
        {"histdel", 1, 2, f_histdel},
        {"histget", 1, 2, f_histget},
        {"histnr", 1, 1, f_histnr},
        {"hlID", 1, 1, f_hlID},
        {"hlexists", 1, 1, f_hlexists},
        {"hostname", 0, 0, f_hostname},
        {"iconv", 3, 3, f_iconv},
        {"indent", 1, 1, f_indent},
        {"index", 2, 4, f_index},
        {"input", 1, 3, f_input},
        {"inputdialog", 1, 3, f_inputdialog},
        {"inputlist", 1, 1, f_inputlist},
        {"inputrestore", 0, 0, f_inputrestore},
        {"inputsave", 0, 0, f_inputsave},
        {"inputsecret", 1, 2, f_inputsecret},
        {"insert", 2, 3, f_insert},
        {"invert", 1, 1, f_invert},
        {"isdirectory", 1, 1, f_isdirectory},
#if defined(FEAT_FLOAT) && defined(HAVE_MATH_H)
        {"isinf", 1, 1, f_isinf},
#endif
        {"islocked", 1, 1, f_islocked},
#if defined(FEAT_FLOAT) && defined(HAVE_MATH_H)
        {"isnan", 1, 1, f_isnan},
#endif
        {"items", 1, 1, f_items},
#ifdef FEAT_JOB_CHANNEL
        {"job_getchannel", 1, 1, f_job_getchannel},
        {"job_info", 0, 1, f_job_info},
        {"job_setoptions", 2, 2, f_job_setoptions},
        {"job_start", 1, 2, f_job_start},
        {"job_status", 1, 1, f_job_status},
        {"job_stop", 1, 2, f_job_stop},
#endif
        {"join", 1, 2, f_join},
        {"js_decode", 1, 1, f_js_decode},
        {"js_encode", 1, 1, f_js_encode},
        {"json_decode", 1, 1, f_json_decode},
        {"json_encode", 1, 1, f_json_encode},
        {"keys", 1, 1, f_keys},
        {"last_buffer_nr", 0, 0, f_last_buffer_nr}, /* obsolete */
        {"len", 1, 1, f_len},
        {"libcall", 3, 3, f_libcall},
        {"libcallnr", 3, 3, f_libcallnr},
        {"line", 1, 1, f_line},
        {"line2byte", 1, 1, f_line2byte},
        {"lispindent", 1, 1, f_lispindent},
        {"list2str", 1, 2, f_list2str},
        {"listener_add", 1, 2, f_listener_add},
        {"listener_flush", 0, 1, f_listener_flush},
        {"listener_remove", 1, 1, f_listener_remove},
        {"localtime", 0, 0, f_localtime},
#ifdef FEAT_FLOAT
        {"log", 1, 1, f_log},
        {"log10", 1, 1, f_log10},
#endif
#ifdef FEAT_LUA
        {"luaeval", 1, 2, f_luaeval},
#endif
        {"map", 2, 2, f_map},
        {"maparg", 1, 4, f_maparg},
        {"mapcheck", 1, 3, f_mapcheck},
        {"match", 2, 4, f_match},
        {"matchadd", 2, 5, f_matchadd},
        {"matchaddpos", 2, 5, f_matchaddpos},
        {"matcharg", 1, 1, f_matcharg},
        {"matchdelete", 1, 2, f_matchdelete},
        {"matchend", 2, 4, f_matchend},
        {"matchlist", 2, 4, f_matchlist},
        {"matchstr", 2, 4, f_matchstr},
        {"matchstrpos", 2, 4, f_matchstrpos},
        {"max", 1, 1, f_max},
        {"min", 1, 1, f_min},
#ifdef vim_mkdir
        {"mkdir", 1, 3, f_mkdir},
#endif
        {"mode", 0, 1, f_mode},
#ifdef FEAT_MZSCHEME
        {"mzeval", 1, 1, f_mzeval},
#endif
        {"nextnonblank", 1, 1, f_nextnonblank},
        {"nr2char", 1, 2, f_nr2char},
        {"or", 2, 2, f_or},
        {"pathshorten", 1, 1, f_pathshorten},
#ifdef FEAT_FLOAT
        {"pow", 2, 2, f_pow},
#endif
        {"prevnonblank", 1, 1, f_prevnonblank},
        {"printf", 1, 19, f_printf},
#ifdef FEAT_JOB_CHANNEL
        {"prompt_setcallback", 2, 2, f_prompt_setcallback},
        {"prompt_setinterrupt", 2, 2, f_prompt_setinterrupt},
        {"prompt_setprompt", 2, 2, f_prompt_setprompt},
#endif
        {"pumvisible", 0, 0, f_pumvisible},
#ifdef FEAT_PYTHON3
        {"py3eval", 1, 1, f_py3eval},
#endif
#ifdef FEAT_PYTHON
        {"pyeval", 1, 1, f_pyeval},
#endif
#if defined(FEAT_PYTHON) || defined(FEAT_PYTHON3)
        {"pyxeval", 1, 1, f_pyxeval},
#endif
        {"range", 1, 3, f_range},
        {"readdir", 1, 2, f_readdir},
        {"readfile", 1, 3, f_readfile},
        {"reg_executing", 0, 0, f_reg_executing},
        {"reg_recording", 0, 0, f_reg_recording},
        {"reltime", 0, 2, f_reltime},
#ifdef FEAT_FLOAT
        {"reltimefloat", 1, 1, f_reltimefloat},
#endif
        {"reltimestr", 1, 1, f_reltimestr},
        {"remote_expr", 2, 4, f_remote_expr},
        {"remote_foreground", 1, 1, f_remote_foreground},
        {"remote_peek", 1, 2, f_remote_peek},
        {"remote_read", 1, 2, f_remote_read},
        {"remote_send", 2, 3, f_remote_send},
        {"remote_startserver", 1, 1, f_remote_startserver},
        {"remove", 2, 3, f_remove},
        {"rename", 2, 2, f_rename},
        {"repeat", 2, 2, f_repeat},
        {"resolve", 1, 1, f_resolve},
        {"reverse", 1, 1, f_reverse},
#ifdef FEAT_FLOAT
        {"round", 1, 1, f_round},
#endif
        {"screenattr", 2, 2, f_screenattr},
        {"screenchar", 2, 2, f_screenchar},
        {"screenchars", 2, 2, f_screenchars},
        {"screencol", 0, 0, f_screencol},
        {"screenrow", 0, 0, f_screenrow},
        {"screenstring", 2, 2, f_screenstring},
        {"search", 1, 4, f_search},
        {"searchdecl", 1, 3, f_searchdecl},
        {"searchpair", 3, 7, f_searchpair},
        {"searchpairpos", 3, 7, f_searchpairpos},
        {"searchpos", 1, 4, f_searchpos},
        {"server2client", 2, 2, f_server2client},
        {"serverlist", 0, 0, f_serverlist},
        {"setbufline", 3, 3, f_setbufline},
        {"setbufvar", 3, 3, f_setbufvar},
        {"setcharsearch", 1, 1, f_setcharsearch},
        {"setcmdpos", 1, 1, f_setcmdpos},
        {"setenv", 2, 2, f_setenv},
        {"setfperm", 2, 2, f_setfperm},
        {"setline", 2, 2, f_setline},
        {"setloclist", 2, 4, f_setloclist},
        {"setmatches", 1, 2, f_setmatches},
        {"setpos", 2, 2, f_setpos},
        {"setqflist", 1, 3, f_setqflist},
        {"setreg", 2, 3, f_setreg},
        {"settabvar", 3, 3, f_settabvar},
        {"settabwinvar", 4, 4, f_settabwinvar},
        {"settagstack", 2, 3, f_settagstack},
        {"setwinvar", 3, 3, f_setwinvar},
        {"shellescape", 1, 2, f_shellescape},
        {"shiftwidth", 0, 1, f_shiftwidth},
#ifdef FEAT_SIGNS
        {"sign_define", 1, 2, f_sign_define},
        {"sign_getdefined", 0, 1, f_sign_getdefined},
        {"sign_getplaced", 0, 2, f_sign_getplaced},
        {"sign_jump", 3, 3, f_sign_jump},
        {"sign_place", 4, 5, f_sign_place},
        {"sign_undefine", 0, 1, f_sign_undefine},
        {"sign_unplace", 1, 2, f_sign_unplace},
#endif
        {"simplify", 1, 1, f_simplify},
#ifdef FEAT_FLOAT
        {"sin", 1, 1, f_sin},
        {"sinh", 1, 1, f_sinh},
#endif
        {"sort", 1, 3, f_sort},
        {"soundfold", 1, 1, f_soundfold},
        {"spellbadword", 0, 1, f_spellbadword},
        {"spellsuggest", 1, 3, f_spellsuggest},
        {"split", 1, 3, f_split},
#ifdef FEAT_FLOAT
        {"sqrt", 1, 1, f_sqrt},
        {"str2float", 1, 1, f_str2float},
#endif
        {"str2list", 1, 2, f_str2list},
        {"str2nr", 1, 2, f_str2nr},
        {"strcharpart", 2, 3, f_strcharpart},
        {"strchars", 1, 2, f_strchars},
        {"strdisplaywidth", 1, 2, f_strdisplaywidth},
#ifdef HAVE_STRFTIME
        {"strftime", 1, 2, f_strftime},
#endif
        {"strgetchar", 2, 2, f_strgetchar},
        {"stridx", 2, 3, f_stridx},
        {"string", 1, 1, f_string},
        {"strlen", 1, 1, f_strlen},
        {"strpart", 2, 3, f_strpart},
        {"strridx", 2, 3, f_strridx},
        {"strtrans", 1, 1, f_strtrans},
        {"strwidth", 1, 1, f_strwidth},
        {"submatch", 1, 2, f_submatch},
        {"substitute", 4, 4, f_substitute},
        {"swapinfo", 1, 1, f_swapinfo},
        {"swapname", 1, 1, f_swapname},
        {"synID", 3, 3, f_synID},
        {"synIDattr", 2, 3, f_synIDattr},
        {"synIDtrans", 1, 1, f_synIDtrans},
        {"synconcealed", 2, 2, f_synconcealed},
        {"synstack", 2, 2, f_synstack},
        {"system", 1, 2, f_system},
        {"systemlist", 1, 2, f_systemlist},
        {"tabpagebuflist", 0, 1, f_tabpagebuflist},
        {"tabpagenr", 0, 1, f_tabpagenr},
        {"tabpagewinnr", 1, 2, f_tabpagewinnr},
        {"tagfiles", 0, 0, f_tagfiles},
        {"taglist", 1, 2, f_taglist},
#ifdef FEAT_FLOAT
        {"tan", 1, 1, f_tan},
        {"tanh", 1, 1, f_tanh},
#endif
        {"tempname", 0, 0, f_tempname},
#ifdef FEAT_TERMINAL
        {"term_dumpdiff", 2, 3, f_term_dumpdiff},
        {"term_dumpload", 1, 2, f_term_dumpload},
        {"term_dumpwrite", 2, 3, f_term_dumpwrite},
        {"term_getaltscreen", 1, 1, f_term_getaltscreen},
        {"term_getattr", 2, 2, f_term_getattr},
        {"term_getcursor", 1, 1, f_term_getcursor},
        {"term_getjob", 1, 1, f_term_getjob},
        {"term_getline", 2, 2, f_term_getline},
        {"term_getscrolled", 1, 1, f_term_getscrolled},
        {"term_getsize", 1, 1, f_term_getsize},
        {"term_getstatus", 1, 1, f_term_getstatus},
        {"term_gettitle", 1, 1, f_term_gettitle},
        {"term_gettty", 1, 2, f_term_gettty},
        {"term_list", 0, 0, f_term_list},
        {"term_scrape", 2, 2, f_term_scrape},
        {"term_sendkeys", 2, 2, f_term_sendkeys},
        {"term_setkill", 2, 2, f_term_setkill},
        {"term_setrestore", 2, 2, f_term_setrestore},
        {"term_setsize", 3, 3, f_term_setsize},
        {"term_start", 1, 2, f_term_start},
        {"term_wait", 1, 2, f_term_wait},
#endif
        {"test_alloc_fail", 3, 3, f_test_alloc_fail},
        {"test_autochdir", 0, 0, f_test_autochdir},
        {"test_feedinput", 1, 1, f_test_feedinput},
        {"test_garbagecollect_now", 0, 0, f_test_garbagecollect_now},
        {"test_getvalue", 1, 1, f_test_getvalue},
        {"test_ignore_error", 1, 1, f_test_ignore_error},
        {"test_null_blob", 0, 0, f_test_null_blob},
#ifdef FEAT_JOB_CHANNEL
        {"test_null_channel", 0, 0, f_test_null_channel},
#endif
        {"test_null_dict", 0, 0, f_test_null_dict},
#ifdef FEAT_JOB_CHANNEL
        {"test_null_job", 0, 0, f_test_null_job},
#endif
        {"test_null_list", 0, 0, f_test_null_list},
        {"test_null_partial", 0, 0, f_test_null_partial},
        {"test_null_string", 0, 0, f_test_null_string},
        {"test_option_not_set", 1, 1, f_test_option_not_set},
        {"test_override", 2, 2, f_test_override},
        {"test_refcount", 1, 1, f_test_refcount},
        {"test_settime", 1, 1, f_test_settime},
#ifdef FEAT_TIMERS
        {"timer_info", 0, 1, f_timer_info},
        {"timer_pause", 2, 2, f_timer_pause},
        {"timer_start", 2, 3, f_timer_start},
        {"timer_stop", 1, 1, f_timer_stop},
        {"timer_stopall", 0, 0, f_timer_stopall},
#endif
        {"tolower", 1, 1, f_tolower},
        {"toupper", 1, 1, f_toupper},
        {"tr", 3, 3, f_tr},
        {"trim", 1, 2, f_trim},
#ifdef FEAT_FLOAT
        {"trunc", 1, 1, f_trunc},
#endif
        {"type", 1, 1, f_type},
        {"undofile", 1, 1, f_undofile},
        {"undotree", 0, 0, f_undotree},
        {"uniq", 1, 3, f_uniq},
        {"values", 1, 1, f_values},
        {"virtcol", 1, 1, f_virtcol},
        {"visualmode", 0, 1, f_visualmode},
        {"wildmenumode", 0, 0, f_wildmenumode},
        {"win_execute", 2, 3, f_win_execute},
        {"win_findbuf", 1, 1, f_win_findbuf},
        {"win_getid", 0, 2, f_win_getid},
        {"win_gotoid", 1, 1, f_win_gotoid},
        {"win_id2tabwin", 1, 1, f_win_id2tabwin},
        {"win_id2win", 1, 1, f_win_id2win},
        {"win_screenpos", 1, 1, f_win_screenpos},
        {"winbufnr", 1, 1, f_winbufnr},
        {"wincol", 0, 0, f_wincol},
        {"winheight", 1, 1, f_winheight},
        {"winlayout", 0, 1, f_winlayout},
        {"winline", 0, 0, f_winline},
        {"winnr", 0, 1, f_winnr},
        {"winrestcmd", 0, 0, f_winrestcmd},
        {"winrestview", 1, 1, f_winrestview},
        {"winsaveview", 0, 0, f_winsaveview},
        {"winwidth", 1, 1, f_winwidth},
        {"wordcount", 0, 0, f_wordcount},
        {"writefile", 2, 3, f_writefile},
        {"xor", 2, 2, f_xor},
};

#if defined(FEAT_CMDL_COMPL) || defined(PROTO)

/*
 * Function given to ExpandGeneric() to obtain the list of internal
 * or user defined function names.
 */
char_u *
get_function_name(expand_T *xp, int idx)
{
  static int intidx = -1;
  char_u *name;

  if (idx == 0)
    intidx = -1;
  if (intidx < 0)
  {
    name = get_user_func_name(xp, idx);
    if (name != NULL)
      return name;
  }
  if (++intidx < (int)(sizeof(functions) / sizeof(struct fst)))
  {
    STRCPY(IObuff, functions[intidx].f_name);
    STRCAT(IObuff, "(");
    if (functions[intidx].f_max_argc == 0)
      STRCAT(IObuff, ")");
    return IObuff;
  }

  return NULL;
}

/*
 * Function given to ExpandGeneric() to obtain the list of internal or
 * user defined variable or function names.
 */
char_u *
get_expr_name(expand_T *xp, int idx)
{
  static int intidx = -1;
  char_u *name;

  if (idx == 0)
    intidx = -1;
  if (intidx < 0)
  {
    name = get_function_name(xp, idx);
    if (name != NULL)
      return name;
  }
  return get_user_var_name(xp, ++intidx);
}

#endif /* FEAT_CMDL_COMPL */

/*
 * Find internal function in table above.
 * Return index, or -1 if not found
 */
int find_internal_func(
    char_u *name) /* name of the function */
{
  int first = 0;
  int last = (int)(sizeof(functions) / sizeof(struct fst)) - 1;
  int cmp;
  int x;

  /*
     * Find the function name in the table. Binary search.
     */
  while (first <= last)
  {
    x = first + ((unsigned)(last - first) >> 1);
    cmp = STRCMP(name, functions[x].f_name);
    if (cmp < 0)
      last = x - 1;
    else if (cmp > 0)
      first = x + 1;
    else
      return x;
  }
  return -1;
}

int call_internal_func(
    char_u *name,
    int argcount,
    typval_T *argvars,
    typval_T *rettv)
{
  int i;

  i = find_internal_func(name);
  if (i < 0)
    return ERROR_UNKNOWN;
  if (argcount < functions[i].f_min_argc)
    return ERROR_TOOFEW;
  if (argcount > functions[i].f_max_argc)
    return ERROR_TOOMANY;
  argvars[argcount].v_type = VAR_UNKNOWN;
  functions[i].f_func(argvars, rettv);
  return ERROR_NONE;
}

/*
 * Return TRUE for a non-zero Number and a non-empty String.
 */
static int
non_zero_arg(typval_T *argvars)
{
  return ((argvars[0].v_type == VAR_NUMBER && argvars[0].vval.v_number != 0) || (argvars[0].v_type == VAR_SPECIAL && argvars[0].vval.v_number == VVAL_TRUE) || (argvars[0].v_type == VAR_STRING && argvars[0].vval.v_string != NULL && *argvars[0].vval.v_string != NUL));
}

/*
 * Get the lnum from the first argument.
 * Also accepts ".", "$", etc., but that only works for the current buffer.
 * Returns -1 on error.
 */
static linenr_T
tv_get_lnum(typval_T *argvars)
{
  typval_T rettv;
  linenr_T lnum;

  lnum = (linenr_T)tv_get_number_chk(&argvars[0], NULL);
  if (lnum == 0) /* no valid number, try using line() */
  {
    rettv.v_type = VAR_NUMBER;
    f_line(argvars, &rettv);
    lnum = (linenr_T)rettv.vval.v_number;
    clear_tv(&rettv);
  }
  return lnum;
}

/*
 * Get the lnum from the first argument.
 * Also accepts "$", then "buf" is used.
 * Returns 0 on error.
 */
static linenr_T
tv_get_lnum_buf(typval_T *argvars, buf_T *buf)
{
  if (argvars[0].v_type == VAR_STRING && argvars[0].vval.v_string != NULL && argvars[0].vval.v_string[0] == '$' && buf != NULL)
    return buf->b_ml.ml_line_count;
  return (linenr_T)tv_get_number_chk(&argvars[0], NULL);
}

#ifdef FEAT_FLOAT
/*
 * Get the float value of "argvars[0]" into "f".
 * Returns FAIL when the argument is not a Number or Float.
 */
static int
get_float_arg(typval_T *argvars, float_T *f)
{
  if (argvars[0].v_type == VAR_FLOAT)
  {
    *f = argvars[0].vval.v_float;
    return OK;
  }
  if (argvars[0].v_type == VAR_NUMBER)
  {
    *f = (float_T)argvars[0].vval.v_number;
    return OK;
  }
  emsg(_("E808: Number or Float required"));
  return FAIL;
}

/*
 * "abs(expr)" function
 */
static void
f_abs(typval_T *argvars, typval_T *rettv)
{
  if (argvars[0].v_type == VAR_FLOAT)
  {
    rettv->v_type = VAR_FLOAT;
    rettv->vval.v_float = fabs(argvars[0].vval.v_float);
  }
  else
  {
    varnumber_T n;
    int error = FALSE;

    n = tv_get_number_chk(&argvars[0], &error);
    if (error)
      rettv->vval.v_number = -1;
    else if (n > 0)
      rettv->vval.v_number = n;
    else
      rettv->vval.v_number = -n;
  }
}

/*
 * "acos()" function
 */
static void
f_acos(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    rettv->vval.v_float = acos(f);
  else
    rettv->vval.v_float = 0.0;
}
#endif

/*
 * "add(list, item)" function
 */
static void
f_add(typval_T *argvars, typval_T *rettv)
{
  list_T *l;
  blob_T *b;

  rettv->vval.v_number = 1; /* Default: Failed */
  if (argvars[0].v_type == VAR_LIST)
  {
    if ((l = argvars[0].vval.v_list) != NULL && !var_check_lock(l->lv_lock, (char_u *)N_("add() argument"), TRUE) && list_append_tv(l, &argvars[1]) == OK)
      copy_tv(&argvars[0], rettv);
  }
  else if (argvars[0].v_type == VAR_BLOB)
  {
    if ((b = argvars[0].vval.v_blob) != NULL && !var_check_lock(b->bv_lock,
                                                                (char_u *)N_("add() argument"), TRUE))
    {
      int error = FALSE;
      varnumber_T n = tv_get_number_chk(&argvars[1], &error);

      if (!error)
      {
        ga_append(&b->bv_ga, (int)n);
        copy_tv(&argvars[0], rettv);
      }
    }
  }
  else
    emsg(_(e_listblobreq));
}

/*
 * "and(expr, expr)" function
 */
static void
f_and(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = tv_get_number_chk(&argvars[0], NULL) & tv_get_number_chk(&argvars[1], NULL);
}

/*
 * If there is a window for "curbuf", make it the current window.
 */
static void
find_win_for_curbuf(void)
{
  wininfo_T *wip;

  for (wip = curbuf->b_wininfo; wip != NULL; wip = wip->wi_next)
  {
    if (wip->wi_win != NULL)
    {
      curwin = wip->wi_win;
      break;
    }
  }
}

/*
 * Set line or list of lines in buffer "buf".
 */
static void
set_buffer_lines(
    buf_T *buf,
    linenr_T lnum_arg,
    int append,
    typval_T *lines,
    typval_T *rettv)
{
  linenr_T lnum = lnum_arg + (append ? 1 : 0);
  char_u *line = NULL;
  list_T *l = NULL;
  listitem_T *li = NULL;
  long added = 0;
  linenr_T append_lnum;
  buf_T *curbuf_save = NULL;
  win_T *curwin_save = NULL;
  int is_curbuf = buf == curbuf;

  /* When using the current buffer ml_mfp will be set if needed.  Useful when
     * setline() is used on startup.  For other buffers the buffer must be
     * loaded. */
  if (buf == NULL || (!is_curbuf && buf->b_ml.ml_mfp == NULL) || lnum < 1)
  {
    rettv->vval.v_number = 1; /* FAIL */
    return;
  }

  if (!is_curbuf)
  {
    curbuf_save = curbuf;
    curwin_save = curwin;
    curbuf = buf;
    find_win_for_curbuf();
  }

  if (append)
    // appendbufline() uses the line number below which we insert
    append_lnum = lnum - 1;
  else
    // setbufline() uses the line number above which we insert, we only
    // append if it's below the last line
    append_lnum = curbuf->b_ml.ml_line_count;

  if (lines->v_type == VAR_LIST)
  {
    l = lines->vval.v_list;
    li = l->lv_first;
  }
  else
    line = tv_get_string_chk(lines);

  /* default result is zero == OK */
  for (;;)
  {
    if (l != NULL)
    {
      /* list argument, get next string */
      if (li == NULL)
        break;
      line = tv_get_string_chk(&li->li_tv);
      li = li->li_next;
    }

    rettv->vval.v_number = 1; /* FAIL */
    if (line == NULL || lnum > curbuf->b_ml.ml_line_count + 1)
      break;

    /* When coming here from Insert mode, sync undo, so that this can be
	 * undone separately from what was previously inserted. */
    if (u_sync_once == 2)
    {
      u_sync_once = 1; /* notify that u_sync() was called */
      u_sync(TRUE);
    }

    if (!append && lnum <= curbuf->b_ml.ml_line_count)
    {
      // Existing line, replace it.
      // Removes any existing text properties.
      if (u_savesub(lnum) == OK && ml_replace_len(
                                       lnum, line, (colnr_T)STRLEN(line) + 1, TRUE, TRUE) == OK)
      {
        changed_bytes(lnum, 0);
        if (is_curbuf && lnum == curwin->w_cursor.lnum)
          check_cursor_col();
        rettv->vval.v_number = 0; /* OK */
      }
    }
    else if (added > 0 || u_save(lnum - 1, lnum) == OK)
    {
      /* append the line */
      ++added;
      if (ml_append(lnum - 1, line, (colnr_T)0, FALSE) == OK)
        rettv->vval.v_number = 0; /* OK */
    }

    if (l == NULL) /* only one string argument */
      break;
    ++lnum;
  }

  if (added > 0)
  {
    win_T *wp;
    tabpage_T *tp;

    appended_lines_mark(append_lnum, added);
    FOR_ALL_TAB_WINDOWS(tp, wp)
    if (wp->w_buffer == buf && wp->w_cursor.lnum > append_lnum)
      wp->w_cursor.lnum += added;
    check_cursor_col();

#ifdef FEAT_JOB_CHANNEL
    if (bt_prompt(curbuf) && (State & INSERT))
      // show the line with the prompt
      update_topline();
#endif
  }

  if (!is_curbuf)
  {
    curbuf = curbuf_save;
    curwin = curwin_save;
  }
}

/*
 * "append(lnum, string/list)" function
 */
static void
f_append(typval_T *argvars, typval_T *rettv)
{
  linenr_T lnum = tv_get_lnum(&argvars[0]);

  set_buffer_lines(curbuf, lnum, TRUE, &argvars[1], rettv);
}

/*
 * "appendbufline(buf, lnum, string/list)" function
 */
static void
f_appendbufline(typval_T *argvars, typval_T *rettv)
{
  linenr_T lnum;
  buf_T *buf;

  buf = tv_get_buf(&argvars[0], FALSE);
  if (buf == NULL)
    rettv->vval.v_number = 1; /* FAIL */
  else
  {
    lnum = tv_get_lnum_buf(&argvars[1], buf);
    set_buffer_lines(buf, lnum, TRUE, &argvars[2], rettv);
  }
}

/*
 * "argc([window id])" function
 */
static void
f_argc(typval_T *argvars, typval_T *rettv)
{
  win_T *wp;

  if (argvars[0].v_type == VAR_UNKNOWN)
    // use the current window
    rettv->vval.v_number = ARGCOUNT;
  else if (argvars[0].v_type == VAR_NUMBER && tv_get_number(&argvars[0]) == -1)
    // use the global argument list
    rettv->vval.v_number = GARGCOUNT;
  else
  {
    // use the argument list of the specified window
    wp = find_win_by_nr_or_id(&argvars[0]);
    if (wp != NULL)
      rettv->vval.v_number = WARGCOUNT(wp);
    else
      rettv->vval.v_number = -1;
  }
}

/*
 * "argidx()" function
 */
static void
f_argidx(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->vval.v_number = curwin->w_arg_idx;
}

/*
 * "arglistid()" function
 */
static void
f_arglistid(typval_T *argvars, typval_T *rettv)
{
  win_T *wp;

  rettv->vval.v_number = -1;
  wp = find_tabwin(&argvars[0], &argvars[1], NULL);
  if (wp != NULL)
    rettv->vval.v_number = wp->w_alist->id;
}

/*
 * Get the argument list for a given window
 */
static void
get_arglist_as_rettv(aentry_T *arglist, int argcount, typval_T *rettv)
{
  int idx;

  if (rettv_list_alloc(rettv) == OK && arglist != NULL)
    for (idx = 0; idx < argcount; ++idx)
      list_append_string(rettv->vval.v_list,
                         alist_name(&arglist[idx]), -1);
}

/*
 * "argv(nr)" function
 */
static void
f_argv(typval_T *argvars, typval_T *rettv)
{
  int idx;
  aentry_T *arglist = NULL;
  int argcount = -1;

  if (argvars[0].v_type != VAR_UNKNOWN)
  {
    if (argvars[1].v_type == VAR_UNKNOWN)
    {
      arglist = ARGLIST;
      argcount = ARGCOUNT;
    }
    else if (argvars[1].v_type == VAR_NUMBER && tv_get_number(&argvars[1]) == -1)
    {
      arglist = GARGLIST;
      argcount = GARGCOUNT;
    }
    else
    {
      win_T *wp = find_win_by_nr_or_id(&argvars[1]);

      if (wp != NULL)
      {
        /* Use the argument list of the specified window */
        arglist = WARGLIST(wp);
        argcount = WARGCOUNT(wp);
      }
    }

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;
    idx = tv_get_number_chk(&argvars[0], NULL);
    if (arglist != NULL && idx >= 0 && idx < argcount)
      rettv->vval.v_string = vim_strsave(alist_name(&arglist[idx]));
    else if (idx == -1)
      get_arglist_as_rettv(arglist, argcount, rettv);
  }
  else
    get_arglist_as_rettv(ARGLIST, ARGCOUNT, rettv);
}

/*
 * "assert_beeps(cmd [, error])" function
 */
static void
f_assert_beeps(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = assert_beeps(argvars);
}

/*
 * "assert_equal(expected, actual[, msg])" function
 */
static void
f_assert_equal(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = assert_equal_common(argvars, ASSERT_EQUAL);
}

/*
 * "assert_equalfile(fname-one, fname-two)" function
 */
static void
f_assert_equalfile(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = assert_equalfile(argvars);
}

/*
 * "assert_notequal(expected, actual[, msg])" function
 */
static void
f_assert_notequal(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = assert_equal_common(argvars, ASSERT_NOTEQUAL);
}

/*
 * "assert_exception(string[, msg])" function
 */
static void
f_assert_exception(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = assert_exception(argvars);
}

/*
 * "assert_fails(cmd [, error[, msg]])" function
 */
static void
f_assert_fails(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = assert_fails(argvars);
}

/*
 * "assert_false(actual[, msg])" function
 */
static void
f_assert_false(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = assert_bool(argvars, FALSE);
}

/*
 * "assert_inrange(lower, upper[, msg])" function
 */
static void
f_assert_inrange(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = assert_inrange(argvars);
}

/*
 * "assert_match(pattern, actual[, msg])" function
 */
static void
f_assert_match(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = assert_match_common(argvars, ASSERT_MATCH);
}

/*
 * "assert_notmatch(pattern, actual[, msg])" function
 */
static void
f_assert_notmatch(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = assert_match_common(argvars, ASSERT_NOTMATCH);
}

/*
 * "assert_report(msg)" function
 */
static void
f_assert_report(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = assert_report(argvars);
}

/*
 * "assert_true(actual[, msg])" function
 */
static void
f_assert_true(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = assert_bool(argvars, TRUE);
}

#ifdef FEAT_FLOAT
/*
 * "asin()" function
 */
static void
f_asin(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    rettv->vval.v_float = asin(f);
  else
    rettv->vval.v_float = 0.0;
}

/*
 * "atan()" function
 */
static void
f_atan(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    rettv->vval.v_float = atan(f);
  else
    rettv->vval.v_float = 0.0;
}

/*
 * "atan2()" function
 */
static void
f_atan2(typval_T *argvars, typval_T *rettv)
{
  float_T fx = 0.0, fy = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &fx) == OK && get_float_arg(&argvars[1], &fy) == OK)
    rettv->vval.v_float = atan2(fx, fy);
  else
    rettv->vval.v_float = 0.0;
}
#endif

/*
 * "browse(save, title, initdir, default)" function
 */
static void
f_browse(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_BROWSE
  int save;
  char_u *title;
  char_u *initdir;
  char_u *defname;
  char_u buf[NUMBUFLEN];
  char_u buf2[NUMBUFLEN];
  int error = FALSE;

  save = (int)tv_get_number_chk(&argvars[0], &error);
  title = tv_get_string_chk(&argvars[1]);
  initdir = tv_get_string_buf_chk(&argvars[2], buf);
  defname = tv_get_string_buf_chk(&argvars[3], buf2);

  if (error || title == NULL || initdir == NULL || defname == NULL)
    rettv->vval.v_string = NULL;
  else
    rettv->vval.v_string =
        do_browse(save ? BROWSE_SAVE : 0,
                  title, defname, NULL, initdir, NULL, curbuf);
#else
  rettv->vval.v_string = NULL;
#endif
  rettv->v_type = VAR_STRING;
}

/*
 * "browsedir(title, initdir)" function
 */
static void
f_browsedir(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_BROWSE
  char_u *title;
  char_u *initdir;
  char_u buf[NUMBUFLEN];

  title = tv_get_string_chk(&argvars[0]);
  initdir = tv_get_string_buf_chk(&argvars[1], buf);

  if (title == NULL || initdir == NULL)
    rettv->vval.v_string = NULL;
  else
    rettv->vval.v_string = do_browse(BROWSE_DIR,
                                     title, NULL, NULL, initdir, NULL, curbuf);
#else
  rettv->vval.v_string = NULL;
#endif
  rettv->v_type = VAR_STRING;
}

/*
 * Find a buffer by number or exact name.
 */
static buf_T *
find_buffer(typval_T *avar)
{
  buf_T *buf = NULL;

  if (avar->v_type == VAR_NUMBER)
    buf = buflist_findnr((int)avar->vval.v_number);
  else if (avar->v_type == VAR_STRING && avar->vval.v_string != NULL)
  {
    buf = buflist_findname_exp(avar->vval.v_string);
    if (buf == NULL)
    {
      /* No full path name match, try a match with a URL or a "nofile"
	     * buffer, these don't use the full path. */
      FOR_ALL_BUFFERS(buf)
      if (buf->b_fname != NULL && (path_with_url(buf->b_fname)
#ifdef FEAT_QUICKFIX
                                   || bt_nofile(buf)
#endif
                                       ) &&
          STRCMP(buf->b_fname, avar->vval.v_string) == 0)
        break;
    }
  }
  return buf;
}

/*
 * "bufexists(expr)" function
 */
static void
f_bufexists(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = (find_buffer(&argvars[0]) != NULL);
}

/*
 * "buflisted(expr)" function
 */
static void
f_buflisted(typval_T *argvars, typval_T *rettv)
{
  buf_T *buf;

  buf = find_buffer(&argvars[0]);
  rettv->vval.v_number = (buf != NULL && buf->b_p_bl);
}

/*
 * "bufloaded(expr)" function
 */
static void
f_bufloaded(typval_T *argvars, typval_T *rettv)
{
  buf_T *buf;

  buf = find_buffer(&argvars[0]);
  rettv->vval.v_number = (buf != NULL && buf->b_ml.ml_mfp != NULL);
}

buf_T *
buflist_find_by_name(char_u *name, int curtab_only)
{
  int save_magic;
  char_u *save_cpo;
  buf_T *buf;

  /* Ignore 'magic' and 'cpoptions' here to make scripts portable */
  save_magic = p_magic;
  p_magic = TRUE;
  save_cpo = p_cpo;
  p_cpo = (char_u *)"";

  buf = buflist_findnr(buflist_findpat(name, name + STRLEN(name),
                                       TRUE, FALSE, curtab_only));

  p_magic = save_magic;
  p_cpo = save_cpo;
  return buf;
}

/*
 * Get buffer by number or pattern.
 */
buf_T *
tv_get_buf(typval_T *tv, int curtab_only)
{
  char_u *name = tv->vval.v_string;
  buf_T *buf;

  if (tv->v_type == VAR_NUMBER)
    return buflist_findnr((int)tv->vval.v_number);
  if (tv->v_type != VAR_STRING)
    return NULL;
  if (name == NULL || *name == NUL)
    return curbuf;
  if (name[0] == '$' && name[1] == NUL)
    return lastbuf;

  buf = buflist_find_by_name(name, curtab_only);

  /* If not found, try expanding the name, like done for bufexists(). */
  if (buf == NULL)
    buf = find_buffer(tv);

  return buf;
}

/*
 * Get the buffer from "arg" and give an error and return NULL if it is not
 * valid.
 */
buf_T *
get_buf_arg(typval_T *arg)
{
  buf_T *buf;

  ++emsg_off;
  buf = tv_get_buf(arg, FALSE);
  --emsg_off;
  if (buf == NULL)
    semsg(_("E158: Invalid buffer name: %s"), tv_get_string(arg));
  return buf;
}

/*
 * "bufname(expr)" function
 */
static void
f_bufname(typval_T *argvars, typval_T *rettv)
{
  buf_T *buf;

  (void)tv_get_number(&argvars[0]); /* issue errmsg if type error */
  ++emsg_off;
  buf = tv_get_buf(&argvars[0], FALSE);
  rettv->v_type = VAR_STRING;
  if (buf != NULL && buf->b_fname != NULL)
    rettv->vval.v_string = vim_strsave(buf->b_fname);
  else
    rettv->vval.v_string = NULL;
  --emsg_off;
}

/*
 * "bufnr(expr)" function
 */
static void
f_bufnr(typval_T *argvars, typval_T *rettv)
{
  buf_T *buf;
  int error = FALSE;
  char_u *name;

  (void)tv_get_number(&argvars[0]); /* issue errmsg if type error */
  ++emsg_off;
  buf = tv_get_buf(&argvars[0], FALSE);
  --emsg_off;

  /* If the buffer isn't found and the second argument is not zero create a
     * new buffer. */
  if (buf == NULL && argvars[1].v_type != VAR_UNKNOWN && tv_get_number_chk(&argvars[1], &error) != 0 && !error && (name = tv_get_string_chk(&argvars[0])) != NULL && !error)
    buf = buflist_new(name, NULL, (linenr_T)1, 0);

  if (buf != NULL)
    rettv->vval.v_number = buf->b_fnum;
  else
    rettv->vval.v_number = -1;
}

static void
buf_win_common(typval_T *argvars, typval_T *rettv, int get_nr)
{
  win_T *wp;
  int winnr = 0;
  buf_T *buf;

  (void)tv_get_number(&argvars[0]); /* issue errmsg if type error */
  ++emsg_off;
  buf = tv_get_buf(&argvars[0], TRUE);
  FOR_ALL_WINDOWS(wp)
  {
    ++winnr;
    if (wp->w_buffer == buf)
      break;
  }
  rettv->vval.v_number = (wp != NULL ? (get_nr ? winnr : wp->w_id) : -1);
  --emsg_off;
}

/*
 * "bufwinid(nr)" function
 */
static void
f_bufwinid(typval_T *argvars, typval_T *rettv)
{
  buf_win_common(argvars, rettv, FALSE);
}

/*
 * "bufwinnr(nr)" function
 */
static void
f_bufwinnr(typval_T *argvars, typval_T *rettv)
{
  buf_win_common(argvars, rettv, TRUE);
}

/*
 * "byte2line(byte)" function
 */
static void
f_byte2line(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifndef FEAT_BYTEOFF
  rettv->vval.v_number = -1;
#else
  long boff = 0;

  boff = tv_get_number(&argvars[0]) - 1; /* boff gets -1 on type error */
  if (boff < 0)
    rettv->vval.v_number = -1;
  else
    rettv->vval.v_number = ml_find_line_or_offset(curbuf,
                                                  (linenr_T)0, &boff);
#endif
}

static void
byteidx(typval_T *argvars, typval_T *rettv, int comp UNUSED)
{
  char_u *t;
  char_u *str;
  varnumber_T idx;

  str = tv_get_string_chk(&argvars[0]);
  idx = tv_get_number_chk(&argvars[1], NULL);
  rettv->vval.v_number = -1;
  if (str == NULL || idx < 0)
    return;

  t = str;
  for (; idx > 0; idx--)
  {
    if (*t == NUL) /* EOL reached */
      return;
    if (enc_utf8 && comp)
      t += utf_ptr2len(t);
    else
      t += (*mb_ptr2len)(t);
  }
  rettv->vval.v_number = (varnumber_T)(t - str);
}

/*
 * "byteidx()" function
 */
static void
f_byteidx(typval_T *argvars, typval_T *rettv)
{
  byteidx(argvars, rettv, FALSE);
}

/*
 * "byteidxcomp()" function
 */
static void
f_byteidxcomp(typval_T *argvars, typval_T *rettv)
{
  byteidx(argvars, rettv, TRUE);
}

/*
 * "call(func, arglist [, dict])" function
 */
static void
f_call(typval_T *argvars, typval_T *rettv)
{
  char_u *func;
  partial_T *partial = NULL;
  dict_T *selfdict = NULL;

  if (argvars[1].v_type != VAR_LIST)
  {
    emsg(_(e_listreq));
    return;
  }
  if (argvars[1].vval.v_list == NULL)
    return;

  if (argvars[0].v_type == VAR_FUNC)
    func = argvars[0].vval.v_string;
  else if (argvars[0].v_type == VAR_PARTIAL)
  {
    partial = argvars[0].vval.v_partial;
    func = partial_name(partial);
  }
  else
    func = tv_get_string(&argvars[0]);
  if (*func == NUL)
    return; /* type error or empty name */

  if (argvars[2].v_type != VAR_UNKNOWN)
  {
    if (argvars[2].v_type != VAR_DICT)
    {
      emsg(_(e_dictreq));
      return;
    }
    selfdict = argvars[2].vval.v_dict;
  }

  (void)func_call(func, &argvars[1], partial, selfdict, rettv);
}

#ifdef FEAT_FLOAT
/*
 * "ceil({float})" function
 */
static void
f_ceil(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    rettv->vval.v_float = ceil(f);
  else
    rettv->vval.v_float = 0.0;
}
#endif

#ifdef FEAT_JOB_CHANNEL
/*
 * "ch_canread()" function
 */
static void
f_ch_canread(typval_T *argvars, typval_T *rettv)
{
  channel_T *channel = get_channel_arg(&argvars[0], FALSE, FALSE, 0);

  rettv->vval.v_number = 0;
  if (channel != NULL)
    rettv->vval.v_number = channel_has_readahead(channel, PART_SOCK) || channel_has_readahead(channel, PART_OUT) || channel_has_readahead(channel, PART_ERR);
}

/*
 * "ch_close()" function
 */
static void
f_ch_close(typval_T *argvars, typval_T *rettv UNUSED)
{
  channel_T *channel = get_channel_arg(&argvars[0], TRUE, FALSE, 0);

  if (channel != NULL)
  {
    channel_close(channel, FALSE);
    channel_clear(channel);
  }
}

/*
 * "ch_close()" function
 */
static void
f_ch_close_in(typval_T *argvars, typval_T *rettv UNUSED)
{
  channel_T *channel = get_channel_arg(&argvars[0], TRUE, FALSE, 0);

  if (channel != NULL)
    channel_close_in(channel);
}

/*
 * "ch_getbufnr()" function
 */
static void
f_ch_getbufnr(typval_T *argvars, typval_T *rettv)
{
  channel_T *channel = get_channel_arg(&argvars[0], FALSE, FALSE, 0);

  rettv->vval.v_number = -1;
  if (channel != NULL)
  {
    char_u *what = tv_get_string(&argvars[1]);
    int part;

    if (STRCMP(what, "err") == 0)
      part = PART_ERR;
    else if (STRCMP(what, "out") == 0)
      part = PART_OUT;
    else if (STRCMP(what, "in") == 0)
      part = PART_IN;
    else
      part = PART_SOCK;
    if (channel->ch_part[part].ch_bufref.br_buf != NULL)
      rettv->vval.v_number =
          channel->ch_part[part].ch_bufref.br_buf->b_fnum;
  }
}

/*
 * "ch_getjob()" function
 */
static void
f_ch_getjob(typval_T *argvars, typval_T *rettv)
{
  channel_T *channel = get_channel_arg(&argvars[0], FALSE, FALSE, 0);

  if (channel != NULL)
  {
    rettv->v_type = VAR_JOB;
    rettv->vval.v_job = channel->ch_job;
    if (channel->ch_job != NULL)
      ++channel->ch_job->jv_refcount;
  }
}

/*
 * "ch_info()" function
 */
static void
f_ch_info(typval_T *argvars, typval_T *rettv UNUSED)
{
  channel_T *channel = get_channel_arg(&argvars[0], FALSE, FALSE, 0);

  if (channel != NULL && rettv_dict_alloc(rettv) != FAIL)
    channel_info(channel, rettv->vval.v_dict);
}

/*
 * "ch_log()" function
 */
static void
f_ch_log(typval_T *argvars, typval_T *rettv UNUSED)
{
  char_u *msg = tv_get_string(&argvars[0]);
  channel_T *channel = NULL;

  if (argvars[1].v_type != VAR_UNKNOWN)
    channel = get_channel_arg(&argvars[1], FALSE, FALSE, 0);

  ch_log(channel, "%s", msg);
}

/*
 * "ch_logfile()" function
 */
static void
f_ch_logfile(typval_T *argvars, typval_T *rettv UNUSED)
{
  char_u *fname;
  char_u *opt = (char_u *)"";
  char_u buf[NUMBUFLEN];

  /* Don't open a file in restricted mode. */
  if (check_restricted() || check_secure())
    return;
  fname = tv_get_string(&argvars[0]);
  if (argvars[1].v_type == VAR_STRING)
    opt = tv_get_string_buf(&argvars[1], buf);
  ch_logfile(fname, opt);
}

/*
 * "ch_open()" function
 */
static void
f_ch_open(typval_T *argvars, typval_T *rettv)
{
  rettv->v_type = VAR_CHANNEL;
  if (check_restricted() || check_secure())
    return;
  rettv->vval.v_channel = channel_open_func(argvars);
}

/*
 * "ch_read()" function
 */
static void
f_ch_read(typval_T *argvars, typval_T *rettv)
{
  common_channel_read(argvars, rettv, FALSE, FALSE);
}

/*
 * "ch_readblob()" function
 */
static void
f_ch_readblob(typval_T *argvars, typval_T *rettv)
{
  common_channel_read(argvars, rettv, TRUE, TRUE);
}

/*
 * "ch_readraw()" function
 */
static void
f_ch_readraw(typval_T *argvars, typval_T *rettv)
{
  common_channel_read(argvars, rettv, TRUE, FALSE);
}

/*
 * "ch_evalexpr()" function
 */
static void
f_ch_evalexpr(typval_T *argvars, typval_T *rettv)
{
  ch_expr_common(argvars, rettv, TRUE);
}

/*
 * "ch_sendexpr()" function
 */
static void
f_ch_sendexpr(typval_T *argvars, typval_T *rettv)
{
  ch_expr_common(argvars, rettv, FALSE);
}

/*
 * "ch_evalraw()" function
 */
static void
f_ch_evalraw(typval_T *argvars, typval_T *rettv)
{
  ch_raw_common(argvars, rettv, TRUE);
}

/*
 * "ch_sendraw()" function
 */
static void
f_ch_sendraw(typval_T *argvars, typval_T *rettv)
{
  ch_raw_common(argvars, rettv, FALSE);
}

/*
 * "ch_setoptions()" function
 */
static void
f_ch_setoptions(typval_T *argvars, typval_T *rettv UNUSED)
{
  channel_T *channel;
  jobopt_T opt;

  channel = get_channel_arg(&argvars[0], FALSE, FALSE, 0);
  if (channel == NULL)
    return;
  clear_job_options(&opt);
  if (get_job_options(&argvars[1], &opt,
                      JO_CB_ALL + JO_TIMEOUT_ALL + JO_MODE_ALL, 0) == OK)
    channel_set_options(channel, &opt);
  free_job_options(&opt);
}

/*
 * "ch_status()" function
 */
static void
f_ch_status(typval_T *argvars, typval_T *rettv)
{
  channel_T *channel;
  jobopt_T opt;
  int part = -1;

  /* return an empty string by default */
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;

  channel = get_channel_arg(&argvars[0], FALSE, FALSE, 0);

  if (argvars[1].v_type != VAR_UNKNOWN)
  {
    clear_job_options(&opt);
    if (get_job_options(&argvars[1], &opt, JO_PART, 0) == OK && (opt.jo_set & JO_PART))
      part = opt.jo_part;
  }

  rettv->vval.v_string = vim_strsave((char_u *)channel_status(channel, part));
}
#endif

/*
 * "changenr()" function
 */
static void
f_changenr(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->vval.v_number = curbuf->b_u_seq_cur;
}

/*
 * "char2nr(string)" function
 */
static void
f_char2nr(typval_T *argvars, typval_T *rettv)
{
  if (has_mbyte)
  {
    int utf8 = 0;

    if (argvars[1].v_type != VAR_UNKNOWN)
      utf8 = (int)tv_get_number_chk(&argvars[1], NULL);

    if (utf8)
      rettv->vval.v_number = utf_ptr2char(tv_get_string(&argvars[0]));
    else
      rettv->vval.v_number = (*mb_ptr2char)(tv_get_string(&argvars[0]));
  }
  else
    rettv->vval.v_number = tv_get_string(&argvars[0])[0];
}

/*
 * "chdir(dir)" function
 */
static void
f_chdir(typval_T *argvars, typval_T *rettv)
{
  char_u *cwd;
  cdscope_T scope = CDSCOPE_GLOBAL;

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;

  if (argvars[0].v_type != VAR_STRING)
    return;

  // Return the current directory
  cwd = alloc(MAXPATHL);
  if (cwd != NULL)
  {
    if (mch_dirname(cwd, MAXPATHL) != FAIL)
    {
#ifdef BACKSLASH_IN_FILENAME
      slash_adjust(cwd);
#endif
      rettv->vval.v_string = vim_strsave(cwd);
    }
    vim_free(cwd);
  }

  if (curwin->w_localdir != NULL)
    scope = CDSCOPE_WINDOW;
  else if (curtab->tp_localdir != NULL)
    scope = CDSCOPE_TABPAGE;

  if (!changedir_func(argvars[0].vval.v_string, TRUE, scope))
    // Directory change failed
    VIM_CLEAR(rettv->vval.v_string);
}

/*
 * "cindent(lnum)" function
 */
static void
f_cindent(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->vval.v_number = -1;
}

static win_T *
get_optional_window(typval_T *argvars, int idx)
{
  win_T *win = curwin;

  if (argvars[idx].v_type != VAR_UNKNOWN)
  {
    win = find_win_by_nr_or_id(&argvars[idx]);
    if (win == NULL)
    {
      emsg(_(e_invalwindow));
      return NULL;
    }
  }
  return win;
}

/*
 * "clearmatches()" function
 */
static void
f_clearmatches(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_SEARCH_EXTRA
  win_T *win = get_optional_window(argvars, 0);

  if (win != NULL)
    clear_matches(win);
#endif
}

/*
 * "col(string)" function
 */
static void
f_col(typval_T *argvars, typval_T *rettv)
{
  colnr_T col = 0;
  pos_T *fp;
  int fnum = curbuf->b_fnum;

  fp = var2fpos(&argvars[0], FALSE, &fnum);
  if (fp != NULL && fnum == curbuf->b_fnum)
  {
    if (fp->col == MAXCOL)
    {
      /* '> can be MAXCOL, get the length of the line then */
      if (fp->lnum <= curbuf->b_ml.ml_line_count)
        col = (colnr_T)STRLEN(ml_get(fp->lnum)) + 1;
      else
        col = MAXCOL;
    }
    else
    {
      col = fp->col + 1;
      /* col(".") when the cursor is on the NUL at the end of the line
	     * because of "coladd" can be seen as an extra column. */
      if (virtual_active() && fp == &curwin->w_cursor)
      {
        char_u *p = ml_get_cursor();

        if (curwin->w_cursor.coladd >= (colnr_T)chartabsize(p,
                                                            curwin->w_virtcol - curwin->w_cursor.coladd))
        {
          int l;

          if (*p != NUL && p[(l = (*mb_ptr2len)(p))] == NUL)
            col += l;
        }
      }
    }
  }
  rettv->vval.v_number = col;
}

/*
 * "confirm(message, buttons[, default [, type]])" function
 */
static void
f_confirm(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
}

/*
 * "copy()" function
 */
static void
f_copy(typval_T *argvars, typval_T *rettv)
{
  item_copy(&argvars[0], rettv, FALSE, 0);
}

#ifdef FEAT_FLOAT
/*
 * "cos()" function
 */
static void
f_cos(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    rettv->vval.v_float = cos(f);
  else
    rettv->vval.v_float = 0.0;
}

/*
 * "cosh()" function
 */
static void
f_cosh(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    rettv->vval.v_float = cosh(f);
  else
    rettv->vval.v_float = 0.0;
}
#endif

/*
 * "count()" function
 */
static void
f_count(typval_T *argvars, typval_T *rettv)
{
  long n = 0;
  int ic = FALSE;
  int error = FALSE;

  if (argvars[2].v_type != VAR_UNKNOWN)
    ic = (int)tv_get_number_chk(&argvars[2], &error);

  if (argvars[0].v_type == VAR_STRING)
  {
    char_u *expr = tv_get_string_chk(&argvars[1]);
    char_u *p = argvars[0].vval.v_string;
    char_u *next;

    if (!error && expr != NULL && *expr != NUL && p != NULL)
    {
      if (ic)
      {
        size_t len = STRLEN(expr);

        while (*p != NUL)
        {
          if (MB_STRNICMP(p, expr, len) == 0)
          {
            ++n;
            p += len;
          }
          else
            MB_PTR_ADV(p);
        }
      }
      else
        while ((next = (char_u *)strstr((char *)p, (char *)expr)) != NULL)
        {
          ++n;
          p = next + STRLEN(expr);
        }
    }
  }
  else if (argvars[0].v_type == VAR_LIST)
  {
    listitem_T *li;
    list_T *l;
    long idx;

    if ((l = argvars[0].vval.v_list) != NULL)
    {
      li = l->lv_first;
      if (argvars[2].v_type != VAR_UNKNOWN)
      {
        if (argvars[3].v_type != VAR_UNKNOWN)
        {
          idx = (long)tv_get_number_chk(&argvars[3], &error);
          if (!error)
          {
            li = list_find(l, idx);
            if (li == NULL)
              semsg(_(e_listidx), idx);
          }
        }
        if (error)
          li = NULL;
      }

      for (; li != NULL; li = li->li_next)
        if (tv_equal(&li->li_tv, &argvars[1], ic, FALSE))
          ++n;
    }
  }
  else if (argvars[0].v_type == VAR_DICT)
  {
    int todo;
    dict_T *d;
    hashitem_T *hi;

    if ((d = argvars[0].vval.v_dict) != NULL)
    {
      if (argvars[2].v_type != VAR_UNKNOWN)
      {
        if (argvars[3].v_type != VAR_UNKNOWN)
          emsg(_(e_invarg));
      }

      todo = error ? 0 : (int)d->dv_hashtab.ht_used;
      for (hi = d->dv_hashtab.ht_array; todo > 0; ++hi)
      {
        if (!HASHITEM_EMPTY(hi))
        {
          --todo;
          if (tv_equal(&HI2DI(hi)->di_tv, &argvars[1], ic, FALSE))
            ++n;
        }
      }
    }
  }
  else
    semsg(_(e_listdictarg), "count()");
  rettv->vval.v_number = n;
}

/*
 * "cscope_connection([{num} , {dbpath} [, {prepend}]])" function
 *
 * Checks the existence of a cscope connection.
 */
static void
f_cscope_connection(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
}

/*
 * "cursor(lnum, col)" function, or
 * "cursor(list)"
 *
 * Moves the cursor to the specified line and column.
 * Returns 0 when the position could be set, -1 otherwise.
 */
static void
f_cursor(typval_T *argvars, typval_T *rettv)
{
  long line, col;
  long coladd = 0;
  int set_curswant = TRUE;

  rettv->vval.v_number = -1;
  if (argvars[1].v_type == VAR_UNKNOWN)
  {
    pos_T pos;
    colnr_T curswant = -1;

    if (list2fpos(argvars, &pos, NULL, &curswant) == FAIL)
    {
      emsg(_(e_invarg));
      return;
    }
    line = pos.lnum;
    col = pos.col;
    coladd = pos.coladd;
    if (curswant >= 0)
    {
      curwin->w_curswant = curswant - 1;
      set_curswant = FALSE;
    }
  }
  else
  {
    line = tv_get_lnum(argvars);
    col = (long)tv_get_number_chk(&argvars[1], NULL);
    if (argvars[2].v_type != VAR_UNKNOWN)
      coladd = (long)tv_get_number_chk(&argvars[2], NULL);
  }
  if (line < 0 || col < 0 || coladd < 0)
    return; /* type error; errmsg already given */
  if (line > 0)
    curwin->w_cursor.lnum = line;
  if (col > 0)
    curwin->w_cursor.col = col - 1;
  curwin->w_cursor.coladd = coladd;

  /* Make sure the cursor is in a valid position. */
  check_cursor();
  /* Correct cursor for multi-byte character. */
  if (has_mbyte)
    mb_adjust_cursor();

  curwin->w_set_curswant = set_curswant;
  rettv->vval.v_number = 0;
}

#ifdef MSWIN
/*
 * "debugbreak()" function
 */
static void
f_debugbreak(typval_T *argvars, typval_T *rettv)
{
  int pid;

  rettv->vval.v_number = FAIL;
  pid = (int)tv_get_number(&argvars[0]);
  if (pid == 0)
    emsg(_(e_invarg));
  else
  {
    HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, 0, pid);

    if (hProcess != NULL)
    {
      DebugBreakProcess(hProcess);
      CloseHandle(hProcess);
      rettv->vval.v_number = OK;
    }
  }
}
#endif

/*
 * "deepcopy()" function
 */
static void
f_deepcopy(typval_T *argvars, typval_T *rettv)
{
  int noref = 0;
  int copyID;

  if (argvars[1].v_type != VAR_UNKNOWN)
    noref = (int)tv_get_number_chk(&argvars[1], NULL);
  if (noref < 0 || noref > 1)
    emsg(_(e_invarg));
  else
  {
    copyID = get_copyID();
    item_copy(&argvars[0], rettv, TRUE, noref == 0 ? copyID : 0);
  }
}

/*
 * "delete()" function
 */
static void
f_delete(typval_T *argvars, typval_T *rettv)
{
  char_u nbuf[NUMBUFLEN];
  char_u *name;
  char_u *flags;

  rettv->vval.v_number = -1;
  if (check_restricted() || check_secure())
    return;

  name = tv_get_string(&argvars[0]);
  if (name == NULL || *name == NUL)
  {
    emsg(_(e_invarg));
    return;
  }

  if (argvars[1].v_type != VAR_UNKNOWN)
    flags = tv_get_string_buf(&argvars[1], nbuf);
  else
    flags = (char_u *)"";

  if (*flags == NUL)
    /* delete a file */
    rettv->vval.v_number = mch_remove(name) == 0 ? 0 : -1;
  else if (STRCMP(flags, "d") == 0)
    /* delete an empty directory */
    rettv->vval.v_number = mch_rmdir(name) == 0 ? 0 : -1;
  else if (STRCMP(flags, "rf") == 0)
    /* delete a directory recursively */
    rettv->vval.v_number = delete_recursive(name);
  else
    semsg(_(e_invexpr2), flags);
}

/*
 * "deletebufline()" function
 */
static void
f_deletebufline(typval_T *argvars, typval_T *rettv)
{
  buf_T *buf;
  linenr_T first, last;
  linenr_T lnum;
  long count;
  int is_curbuf;
  buf_T *curbuf_save = NULL;
  win_T *curwin_save = NULL;
  tabpage_T *tp;
  win_T *wp;

  buf = tv_get_buf(&argvars[0], FALSE);
  if (buf == NULL)
  {
    rettv->vval.v_number = 1; /* FAIL */
    return;
  }
  is_curbuf = buf == curbuf;

  first = tv_get_lnum_buf(&argvars[1], buf);
  if (argvars[2].v_type != VAR_UNKNOWN)
    last = tv_get_lnum_buf(&argvars[2], buf);
  else
    last = first;

  if (buf->b_ml.ml_mfp == NULL || first < 1 || first > buf->b_ml.ml_line_count || last < first)
  {
    rettv->vval.v_number = 1; /* FAIL */
    return;
  }

  if (!is_curbuf)
  {
    curbuf_save = curbuf;
    curwin_save = curwin;
    curbuf = buf;
    find_win_for_curbuf();
  }
  if (last > curbuf->b_ml.ml_line_count)
    last = curbuf->b_ml.ml_line_count;
  count = last - first + 1;

  // When coming here from Insert mode, sync undo, so that this can be
  // undone separately from what was previously inserted.
  if (u_sync_once == 2)
  {
    u_sync_once = 1; // notify that u_sync() was called
    u_sync(TRUE);
  }

  if (u_save(first - 1, last + 1) == FAIL)
  {
    rettv->vval.v_number = 1; /* FAIL */
    return;
  }

  for (lnum = first; lnum <= last; ++lnum)
    ml_delete(first, TRUE);

  FOR_ALL_TAB_WINDOWS(tp, wp)
  if (wp->w_buffer == buf)
  {
    if (wp->w_cursor.lnum > last)
      wp->w_cursor.lnum -= count;
    else if (wp->w_cursor.lnum > first)
      wp->w_cursor.lnum = first;
    if (wp->w_cursor.lnum > wp->w_buffer->b_ml.ml_line_count)
      wp->w_cursor.lnum = wp->w_buffer->b_ml.ml_line_count;
  }
  check_cursor_col();
  deleted_lines_mark(first, count);

  if (!is_curbuf)
  {
    curbuf = curbuf_save;
    curwin = curwin_save;
  }
}

/*
 * "did_filetype()" function
 */
static void
f_did_filetype(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
  rettv->vval.v_number = did_filetype;
}

/*
 * "diff_filler()" function
 */
static void
f_diff_filler(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_DIFF
  rettv->vval.v_number = diff_check_fill(curwin, tv_get_lnum(argvars));
#endif
}

/*
 * "diff_hlID()" function
 */
static void
f_diff_hlID(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_DIFF
  linenr_T lnum = tv_get_lnum(argvars);
  static linenr_T prev_lnum = 0;
  static varnumber_T changedtick = 0;
  static int fnum = 0;
  static int change_start = 0;
  static int change_end = 0;
  static hlf_T hlID = (hlf_T)0;
  int filler_lines;
  int col;

  if (lnum < 0) /* ignore type error in {lnum} arg */
    lnum = 0;
  if (lnum != prev_lnum || changedtick != CHANGEDTICK(curbuf) || fnum != curbuf->b_fnum)
  {
    /* New line, buffer, change: need to get the values. */
    filler_lines = diff_check(curwin, lnum);
    if (filler_lines < 0)
    {
      if (filler_lines == -1)
      {
        change_start = MAXCOL;
        change_end = -1;
        if (diff_find_change(curwin, lnum, &change_start, &change_end))
          hlID = HLF_ADD; /* added line */
        else
          hlID = HLF_CHD; /* changed line */
      }
      else
        hlID = HLF_ADD; /* added line */
    }
    else
      hlID = (hlf_T)0;
    prev_lnum = lnum;
    changedtick = CHANGEDTICK(curbuf);
    fnum = curbuf->b_fnum;
  }

  if (hlID == HLF_CHD || hlID == HLF_TXD)
  {
    col = tv_get_number(&argvars[1]) - 1; /* ignore type error in {col} */
    if (col >= change_start && col <= change_end)
      hlID = HLF_TXD; /* changed text */
    else
      hlID = HLF_CHD; /* changed line */
  }
  rettv->vval.v_number = hlID == (hlf_T)0 ? 0 : (int)hlID;
#endif
}

/*
 * "empty({expr})" function
 */
static void
f_empty(typval_T *argvars, typval_T *rettv)
{
  int n = FALSE;

  switch (argvars[0].v_type)
  {
  case VAR_STRING:
  case VAR_FUNC:
    n = argvars[0].vval.v_string == NULL || *argvars[0].vval.v_string == NUL;
    break;
  case VAR_PARTIAL:
    n = FALSE;
    break;
  case VAR_NUMBER:
    n = argvars[0].vval.v_number == 0;
    break;
  case VAR_FLOAT:
#ifdef FEAT_FLOAT
    n = argvars[0].vval.v_float == 0.0;
    break;
#endif
  case VAR_LIST:
    n = argvars[0].vval.v_list == NULL || argvars[0].vval.v_list->lv_first == NULL;
    break;
  case VAR_DICT:
    n = argvars[0].vval.v_dict == NULL || argvars[0].vval.v_dict->dv_hashtab.ht_used == 0;
    break;
  case VAR_SPECIAL:
    n = argvars[0].vval.v_number != VVAL_TRUE;
    break;

  case VAR_BLOB:
    n = argvars[0].vval.v_blob == NULL || argvars[0].vval.v_blob->bv_ga.ga_len == 0;
    break;

  case VAR_JOB:
#ifdef FEAT_JOB_CHANNEL
    n = argvars[0].vval.v_job == NULL || argvars[0].vval.v_job->jv_status != JOB_STARTED;
    break;
#endif
  case VAR_CHANNEL:
#ifdef FEAT_JOB_CHANNEL
    n = argvars[0].vval.v_channel == NULL || !channel_is_open(argvars[0].vval.v_channel);
    break;
#endif
  case VAR_UNKNOWN:
    internal_error("f_empty(UNKNOWN)");
    n = TRUE;
    break;
  }

  rettv->vval.v_number = n;
}

/*
 * "environ()" function
 */
static void
f_environ(typval_T *argvars UNUSED, typval_T *rettv)
{
  int i = 0;
  char_u *entry, *value;
#ifdef MSWIN
  extern wchar_t **_wenviron;
#else
  extern char **environ;
#endif

  if (rettv_dict_alloc(rettv) != OK)
    return;

#ifdef MSWIN
  if (*_wenviron == NULL)
    return;
#else
  if (*environ == NULL)
    return;
#endif

  for (i = 0;; ++i)
  {
#ifdef MSWIN
    short_u *p;

    if ((p = (short_u *)_wenviron[i]) == NULL)
      return;
    entry = utf16_to_enc(p, NULL);
#else
    if ((entry = (char_u *)environ[i]) == NULL)
      return;
    entry = vim_strsave(entry);
#endif
    if (entry == NULL) // out of memory
      return;
    if ((value = vim_strchr(entry, '=')) == NULL)
    {
      vim_free(entry);
      continue;
    }
    *value++ = NUL;
    dict_add_string(rettv->vval.v_dict, (char *)entry, value);
    vim_free(entry);
  }
}

/*
 * "escape({string}, {chars})" function
 */
static void
f_escape(typval_T *argvars, typval_T *rettv)
{
  char_u buf[NUMBUFLEN];

  rettv->vval.v_string = vim_strsave_escaped(tv_get_string(&argvars[0]),
                                             tv_get_string_buf(&argvars[1], buf));
  rettv->v_type = VAR_STRING;
}

/*
 * "eval()" function
 */
static void
f_eval(typval_T *argvars, typval_T *rettv)
{
  char_u *s, *p;

  s = tv_get_string_chk(&argvars[0]);
  if (s != NULL)
    s = skipwhite(s);

  p = s;
  if (s == NULL || eval1(&s, rettv, TRUE) == FAIL)
  {
    if (p != NULL && !aborting())
      semsg(_(e_invexpr2), p);
    need_clr_eos = FALSE;
    rettv->v_type = VAR_NUMBER;
    rettv->vval.v_number = 0;
  }
  else if (*s != NUL)
    emsg(_(e_trailing));
}

/*
 * "eventhandler()" function
 */
static void
f_eventhandler(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->vval.v_number = vgetc_busy;
}

/*
 * "executable()" function
 */
static void
f_executable(typval_T *argvars, typval_T *rettv)
{
  char_u *name = tv_get_string(&argvars[0]);

  /* Check in $PATH and also check directly if there is a directory name. */
  rettv->vval.v_number = mch_can_exe(name, NULL, TRUE) || (gettail(name) != name && mch_can_exe(name, NULL, FALSE));
}

static garray_T redir_execute_ga;

/*
 * Append "value[value_len]" to the execute() output.
 */
void execute_redir_str(char_u *value, int value_len)
{
  int len;

  if (value_len == -1)
    len = (int)STRLEN(value); /* Append the entire string */
  else
    len = value_len; /* Append only "value_len" characters */
  if (ga_grow(&redir_execute_ga, len) == OK)
  {
    mch_memmove((char *)redir_execute_ga.ga_data + redir_execute_ga.ga_len, value, len);
    redir_execute_ga.ga_len += len;
  }
}

/*
 * Get next line from a list.
 * Called by do_cmdline() to get the next line.
 * Returns allocated string, or NULL for end of function.
 */

static char_u *
get_list_line(
    int c UNUSED,
    void *cookie,
    int indent UNUSED)
{
  listitem_T **p = (listitem_T **)cookie;
  listitem_T *item = *p;
  char_u buf[NUMBUFLEN];
  char_u *s;

  if (item == NULL)
    return NULL;
  s = tv_get_string_buf_chk(&item->li_tv, buf);
  *p = item->li_next;
  return s == NULL ? NULL : vim_strsave(s);
}

/*
 * "execute()" function
 */
static void
execute_common(typval_T *argvars, typval_T *rettv, int arg_off)
{
  char_u *cmd = NULL;
  list_T *list = NULL;
  int save_msg_silent = msg_silent;
  int save_emsg_silent = emsg_silent;
  int save_emsg_noredir = emsg_noredir;
  int save_redir_execute = redir_execute;
  int save_redir_off = redir_off;
  garray_T save_ga;
  int save_msg_col = msg_col;
  int echo_output = FALSE;

  rettv->vval.v_string = NULL;
  rettv->v_type = VAR_STRING;

  if (argvars[arg_off].v_type == VAR_LIST)
  {
    list = argvars[arg_off].vval.v_list;
    if (list == NULL || list->lv_first == NULL)
      /* empty list, no commands, empty output */
      return;
    ++list->lv_refcount;
  }
  else
  {
    cmd = tv_get_string_chk(&argvars[arg_off]);
    if (cmd == NULL)
      return;
  }

  if (argvars[arg_off + 1].v_type != VAR_UNKNOWN)
  {
    char_u buf[NUMBUFLEN];
    char_u *s = tv_get_string_buf_chk(&argvars[arg_off + 1], buf);

    if (s == NULL)
      return;
    if (*s == NUL)
      echo_output = TRUE;
    if (STRNCMP(s, "silent", 6) == 0)
      ++msg_silent;
    if (STRCMP(s, "silent!") == 0)
    {
      emsg_silent = TRUE;
      emsg_noredir = TRUE;
    }
  }
  else
    ++msg_silent;

  if (redir_execute)
    save_ga = redir_execute_ga;
  ga_init2(&redir_execute_ga, (int)sizeof(char), 500);
  redir_execute = TRUE;
  redir_off = FALSE;
  if (!echo_output)
    msg_col = 0; // prevent leading spaces

  if (cmd != NULL)
    do_cmdline_cmd(cmd);
  else
  {
    listitem_T *item = list->lv_first;

    do_cmdline(NULL, get_list_line, (void *)&item,
               DOCMD_NOWAIT | DOCMD_VERBOSE | DOCMD_REPEAT | DOCMD_KEYTYPED);
    --list->lv_refcount;
  }

  /* Need to append a NUL to the result. */
  if (ga_grow(&redir_execute_ga, 1) == OK)
  {
    ((char *)redir_execute_ga.ga_data)[redir_execute_ga.ga_len] = NUL;
    rettv->vval.v_string = redir_execute_ga.ga_data;
  }
  else
  {
    ga_clear(&redir_execute_ga);
    rettv->vval.v_string = NULL;
  }
  msg_silent = save_msg_silent;
  emsg_silent = save_emsg_silent;
  emsg_noredir = save_emsg_noredir;

  redir_execute = save_redir_execute;
  if (redir_execute)
    redir_execute_ga = save_ga;
  redir_off = save_redir_off;

  // "silent reg" or "silent echo x" leaves msg_col somewhere in the line.
  if (echo_output)
    // When not working silently: put it in column zero.  A following
    // "echon" will overwrite the message, unavoidably.
    msg_col = 0;
  else
    // When working silently: Put it back where it was, since nothing
    // should have been written.
    msg_col = save_msg_col;
}

/*
 * "execute()" function
 */
static void
f_execute(typval_T *argvars, typval_T *rettv)
{
  execute_common(argvars, rettv, 0);
}

/*
 * "exepath()" function
 */
static void
f_exepath(typval_T *argvars, typval_T *rettv)
{
  char_u *p = NULL;

  (void)mch_can_exe(tv_get_string(&argvars[0]), &p, TRUE);
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = p;
}

/*
 * "exists()" function
 */
static void
f_exists(typval_T *argvars, typval_T *rettv)
{
  char_u *p;
  int n = FALSE;

  p = tv_get_string(&argvars[0]);
  if (*p == '$') /* environment variable */
  {
    /* first try "normal" environment variables (fast) */
    if (mch_getenv(p + 1) != NULL)
      n = TRUE;
    else
    {
      /* try expanding things like $VIM and ${HOME} */
      p = expand_env_save(p);
      if (p != NULL && *p != '$')
        n = TRUE;
      vim_free(p);
    }
  }
  else if (*p == '&' || *p == '+') /* option */
  {
    n = (get_option_tv(&p, NULL, TRUE) == OK);
    if (*skipwhite(p) != NUL)
      n = FALSE; /* trailing garbage */
  }
  else if (*p == '*') /* internal or user defined function */
  {
    n = function_exists(p + 1, FALSE);
  }
  else if (*p == ':')
  {
    n = cmd_exists(p + 1);
  }
  else if (*p == '#')
  {
    if (p[1] == '#')
      n = autocmd_supported(p + 2);
    else
      n = au_exists(p + 1);
  }
  else /* internal variable */
  {
    n = var_exists(p);
  }

  rettv->vval.v_number = n;
}

#ifdef FEAT_FLOAT
/*
 * "exp()" function
 */
static void
f_exp(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    rettv->vval.v_float = exp(f);
  else
    rettv->vval.v_float = 0.0;
}
#endif

/*
 * "expand()" function
 */
static void
f_expand(typval_T *argvars, typval_T *rettv)
{
  char_u *s;
  int len;
  char *errormsg;
  int options = WILD_SILENT | WILD_USE_NL | WILD_LIST_NOTFOUND;
  expand_T xpc;
  int error = FALSE;
  char_u *result;

  rettv->v_type = VAR_STRING;
  if (argvars[1].v_type != VAR_UNKNOWN && argvars[2].v_type != VAR_UNKNOWN && tv_get_number_chk(&argvars[2], &error) && !error)
    rettv_list_set(rettv, NULL);

  s = tv_get_string(&argvars[0]);
  if (*s == '%' || *s == '#' || *s == '<')
  {
    ++emsg_off;
    result = eval_vars(s, s, &len, NULL, &errormsg, NULL);
    --emsg_off;
    if (rettv->v_type == VAR_LIST)
    {
      if (rettv_list_alloc(rettv) != FAIL && result != NULL)
        list_append_string(rettv->vval.v_list, result, -1);
      else
        vim_free(result);
    }
    else
      rettv->vval.v_string = result;
  }
  else
  {
    /* When the optional second argument is non-zero, don't remove matches
	 * for 'wildignore' and don't put matches for 'suffixes' at the end. */
    if (argvars[1].v_type != VAR_UNKNOWN && tv_get_number_chk(&argvars[1], &error))
      options |= WILD_KEEP_ALL;
    if (!error)
    {
      ExpandInit(&xpc);
      xpc.xp_context = EXPAND_FILES;
      if (p_wic)
        options += WILD_ICASE;
      if (rettv->v_type == VAR_STRING)
        rettv->vval.v_string = ExpandOne(&xpc, s, NULL,
                                         options, WILD_ALL);
      else if (rettv_list_alloc(rettv) != FAIL)
      {
        int i;

        ExpandOne(&xpc, s, NULL, options, WILD_ALL_KEEP);
        for (i = 0; i < xpc.xp_numfiles; i++)
          list_append_string(rettv->vval.v_list, xpc.xp_files[i], -1);
        ExpandCleanup(&xpc);
      }
    }
    else
      rettv->vval.v_string = NULL;
  }
}

/*
 * "extend(list, list [, idx])" function
 * "extend(dict, dict [, action])" function
 */
static void
f_extend(typval_T *argvars, typval_T *rettv)
{
  char_u *arg_errmsg = (char_u *)N_("extend() argument");

  if (argvars[0].v_type == VAR_LIST && argvars[1].v_type == VAR_LIST)
  {
    list_T *l1, *l2;
    listitem_T *item;
    long before;
    int error = FALSE;

    l1 = argvars[0].vval.v_list;
    l2 = argvars[1].vval.v_list;
    if (l1 != NULL && !var_check_lock(l1->lv_lock, arg_errmsg, TRUE) && l2 != NULL)
    {
      if (argvars[2].v_type != VAR_UNKNOWN)
      {
        before = (long)tv_get_number_chk(&argvars[2], &error);
        if (error)
          return; /* type error; errmsg already given */

        if (before == l1->lv_len)
          item = NULL;
        else
        {
          item = list_find(l1, before);
          if (item == NULL)
          {
            semsg(_(e_listidx), before);
            return;
          }
        }
      }
      else
        item = NULL;
      list_extend(l1, l2, item);

      copy_tv(&argvars[0], rettv);
    }
  }
  else if (argvars[0].v_type == VAR_DICT && argvars[1].v_type == VAR_DICT)
  {
    dict_T *d1, *d2;
    char_u *action;
    int i;

    d1 = argvars[0].vval.v_dict;
    d2 = argvars[1].vval.v_dict;
    if (d1 != NULL && !var_check_lock(d1->dv_lock, arg_errmsg, TRUE) && d2 != NULL)
    {
      /* Check the third argument. */
      if (argvars[2].v_type != VAR_UNKNOWN)
      {
        static char *(av[]) = {"keep", "force", "error"};

        action = tv_get_string_chk(&argvars[2]);
        if (action == NULL)
          return; /* type error; errmsg already given */
        for (i = 0; i < 3; ++i)
          if (STRCMP(action, av[i]) == 0)
            break;
        if (i == 3)
        {
          semsg(_(e_invarg2), action);
          return;
        }
      }
      else
        action = (char_u *)"force";

      dict_extend(d1, d2, action);

      copy_tv(&argvars[0], rettv);
    }
  }
  else
    semsg(_(e_listdictarg), "extend()");
}

/*
 * "feedkeys()" function
 */
static void
f_feedkeys(typval_T *argvars, typval_T *rettv UNUSED)
{
  // TODO: Externalize feedkeys
  //   int remap = TRUE;
  //   int insert = FALSE;
  //   char_u *keys, *flags;
  //   char_u nbuf[NUMBUFLEN];
  //   int typed = FALSE;
  //   int execute = FALSE;
  //   int dangerous = FALSE;
  //   int lowlevel = FALSE;
  //   char_u *keys_esc;

  //   /* This is not allowed in the sandbox.  If the commands would still be
  //      * executed in the sandbox it would be OK, but it probably happens later,
  //      * when "sandbox" is no longer set. */
  //   if (check_secure())
  //     return;

  //   keys = tv_get_string(&argvars[0]);

  //   if (argvars[1].v_type != VAR_UNKNOWN)
  //   {
  //     flags = tv_get_string_buf(&argvars[1], nbuf);
  //     for (; *flags != NUL; ++flags)
  //     {
  //       switch (*flags)
  //       {
  //       case 'n':
  //         remap = FALSE;
  //         break;
  //       case 'm':
  //         remap = TRUE;
  //         break;
  //       case 't':
  //         typed = TRUE;
  //         break;
  //       case 'i':
  //         insert = TRUE;
  //         break;
  //       case 'x':
  //         execute = TRUE;
  //         break;
  //       case '!':
  //         dangerous = TRUE;
  //         break;
  //       case 'L':
  //         lowlevel = TRUE;
  //         break;
  //       }
  //     }
  //   }

  //   if (*keys != NUL || execute)
  //   {
  //     /* Need to escape K_SPECIAL and CSI before putting the string in the
  // 	 * typeahead buffer. */
  //     keys_esc = vim_strsave_escape_csi(keys);
  //     if (keys_esc != NULL)
  //     {
  //       if (lowlevel)
  //       {
  // #ifdef USE_INPUT_BUF
  //         add_to_input_buf(keys, (int)STRLEN(keys));
  // #else
  //         emsg(_("E980: lowlevel input not supported"));
  // #endif
  //       }
  //       else
  //       {
  //         ins_typebuf(keys_esc, (remap ? REMAP_YES : REMAP_NONE),
  //                     insert ? 0 : typebuf.tb_len, !typed, FALSE);
  //         if (vgetc_busy
  // #ifdef FEAT_TIMERS
  //             || timer_busy
  // #endif
  //         )
  //           typebuf_was_filled = TRUE;
  //       }
  //       vim_free(keys_esc);

  //       if (execute)
  //       {
  //         int save_msg_scroll = msg_scroll;

  //         /* Avoid a 1 second delay when the keys start Insert mode. */
  //         msg_scroll = FALSE;

  //         if (!dangerous)
  //           ++ex_normal_busy;
  //         //exec_normal(TRUE, lowlevel, TRUE);
  //         if (!dangerous)
  //           --ex_normal_busy;

  //         msg_scroll |= save_msg_scroll;
  //       }
  //     }
  //   }
}

/*
 * "filereadable()" function
 */
static void
f_filereadable(typval_T *argvars, typval_T *rettv)
{
  int fd;
  char_u *p;
  int n;

#ifndef O_NONBLOCK
#define O_NONBLOCK 0
#endif
  p = tv_get_string(&argvars[0]);
  if (*p && !mch_isdir(p) && (fd = mch_open((char *)p, O_RDONLY | O_NONBLOCK, 0)) >= 0)
  {
    n = TRUE;
    close(fd);
  }
  else
    n = FALSE;

  rettv->vval.v_number = n;
}

/*
 * Return 0 for not writable, 1 for writable file, 2 for a dir which we have
 * rights to write into.
 */
static void
f_filewritable(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = filewritable(tv_get_string(&argvars[0]));
}

static void
findfilendir(
    typval_T *argvars UNUSED,
    typval_T *rettv,
    int find_what UNUSED)
{
#ifdef FEAT_SEARCHPATH
  char_u *fname;
  char_u *fresult = NULL;
  char_u *path = *curbuf->b_p_path == NUL ? p_path : curbuf->b_p_path;
  char_u *p;
  char_u pathbuf[NUMBUFLEN];
  int count = 1;
  int first = TRUE;
  int error = FALSE;
#endif

  rettv->vval.v_string = NULL;
  rettv->v_type = VAR_STRING;

#ifdef FEAT_SEARCHPATH
  fname = tv_get_string(&argvars[0]);

  if (argvars[1].v_type != VAR_UNKNOWN)
  {
    p = tv_get_string_buf_chk(&argvars[1], pathbuf);
    if (p == NULL)
      error = TRUE;
    else
    {
      if (*p != NUL)
        path = p;

      if (argvars[2].v_type != VAR_UNKNOWN)
        count = (int)tv_get_number_chk(&argvars[2], &error);
    }
  }

  if (count < 0 && rettv_list_alloc(rettv) == FAIL)
    error = TRUE;

  if (*fname != NUL && !error)
  {
    do
    {
      if (rettv->v_type == VAR_STRING || rettv->v_type == VAR_LIST)
        vim_free(fresult);
      fresult = find_file_in_path_option(first ? fname : NULL,
                                         first ? (int)STRLEN(fname) : 0,
                                         0, first, path,
                                         find_what,
                                         curbuf->b_ffname,
                                         find_what == FINDFILE_DIR
                                             ? (char_u *)""
                                             : curbuf->b_p_sua);
      first = FALSE;

      if (fresult != NULL && rettv->v_type == VAR_LIST)
        list_append_string(rettv->vval.v_list, fresult, -1);

    } while ((rettv->v_type == VAR_LIST || --count > 0) && fresult != NULL);
  }

  if (rettv->v_type == VAR_STRING)
    rettv->vval.v_string = fresult;
#endif
}

/*
 * "filter()" function
 */
static void
f_filter(typval_T *argvars, typval_T *rettv)
{
  filter_map(argvars, rettv, FALSE);
}

/*
 * "finddir({fname}[, {path}[, {count}]])" function
 */
static void
f_finddir(typval_T *argvars, typval_T *rettv)
{
  findfilendir(argvars, rettv, FINDFILE_DIR);
}

/*
 * "findfile({fname}[, {path}[, {count}]])" function
 */
static void
f_findfile(typval_T *argvars, typval_T *rettv)
{
  findfilendir(argvars, rettv, FINDFILE_FILE);
}

#ifdef FEAT_FLOAT
/*
 * "float2nr({float})" function
 */
static void
f_float2nr(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  if (get_float_arg(argvars, &f) == OK)
  {
    if (f <= -VARNUM_MAX + DBL_EPSILON)
      rettv->vval.v_number = -VARNUM_MAX;
    else if (f >= VARNUM_MAX - DBL_EPSILON)
      rettv->vval.v_number = VARNUM_MAX;
    else
      rettv->vval.v_number = (varnumber_T)f;
  }
}

/*
 * "floor({float})" function
 */
static void
f_floor(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    rettv->vval.v_float = floor(f);
  else
    rettv->vval.v_float = 0.0;
}

/*
 * "fmod()" function
 */
static void
f_fmod(typval_T *argvars, typval_T *rettv)
{
  float_T fx = 0.0, fy = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &fx) == OK && get_float_arg(&argvars[1], &fy) == OK)
    rettv->vval.v_float = fmod(fx, fy);
  else
    rettv->vval.v_float = 0.0;
}
#endif

/*
 * "fnameescape({string})" function
 */
static void
f_fnameescape(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_string = vim_strsave_fnameescape(
      tv_get_string(&argvars[0]), FALSE);
  rettv->v_type = VAR_STRING;
}

/*
 * "fnamemodify({fname}, {mods})" function
 */
static void
f_fnamemodify(typval_T *argvars, typval_T *rettv)
{
  char_u *fname;
  char_u *mods;
  int usedlen = 0;
  int len;
  char_u *fbuf = NULL;
  char_u buf[NUMBUFLEN];

  fname = tv_get_string_chk(&argvars[0]);
  mods = tv_get_string_buf_chk(&argvars[1], buf);
  if (fname == NULL || mods == NULL)
    fname = NULL;
  else
  {
    len = (int)STRLEN(fname);
    (void)modify_fname(mods, FALSE, &usedlen, &fname, &fbuf, &len);
  }

  rettv->v_type = VAR_STRING;
  if (fname == NULL)
    rettv->vval.v_string = NULL;
  else
    rettv->vval.v_string = vim_strnsave(fname, len);
  vim_free(fbuf);
}

/*
 * "foldclosed()" function
 */
static void
foldclosed_both(
    typval_T *argvars UNUSED,
    typval_T *rettv,
    int end UNUSED)
{
#ifdef FEAT_FOLDING
  linenr_T lnum;
  linenr_T first, last;

  lnum = tv_get_lnum(argvars);
  if (lnum >= 1 && lnum <= curbuf->b_ml.ml_line_count)
  {
    if (hasFoldingWin(curwin, lnum, &first, &last, FALSE, NULL))
    {
      if (end)
        rettv->vval.v_number = (varnumber_T)last;
      else
        rettv->vval.v_number = (varnumber_T)first;
      return;
    }
  }
#endif
  rettv->vval.v_number = -1;
}

/*
 * "foldclosed()" function
 */
static void
f_foldclosed(typval_T *argvars, typval_T *rettv)
{
  foldclosed_both(argvars, rettv, FALSE);
}

/*
 * "foldclosedend()" function
 */
static void
f_foldclosedend(typval_T *argvars, typval_T *rettv)
{
  foldclosed_both(argvars, rettv, TRUE);
}

/*
 * "foldlevel()" function
 */
static void
f_foldlevel(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_FOLDING
  linenr_T lnum;

  lnum = tv_get_lnum(argvars);
  if (lnum >= 1 && lnum <= curbuf->b_ml.ml_line_count)
    rettv->vval.v_number = foldLevel(lnum);
#endif
}

/*
 * "foldtext()" function
 */
static void
f_foldtext(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_FOLDING
  linenr_T foldstart;
  linenr_T foldend;
  char_u *dashes;
  linenr_T lnum;
  char_u *s;
  char_u *r;
  int len;
  char *txt;
  long count;
#endif

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;
#ifdef FEAT_FOLDING
  foldstart = (linenr_T)get_vim_var_nr(VV_FOLDSTART);
  foldend = (linenr_T)get_vim_var_nr(VV_FOLDEND);
  dashes = get_vim_var_str(VV_FOLDDASHES);
  if (foldstart > 0 && foldend <= curbuf->b_ml.ml_line_count && dashes != NULL)
  {
    /* Find first non-empty line in the fold. */
    for (lnum = foldstart; lnum < foldend; ++lnum)
      if (!linewhite(lnum))
        break;

    /* Find interesting text in this line. */
    s = skipwhite(ml_get(lnum));
    /* skip C comment-start */
    if (s[0] == '/' && (s[1] == '*' || s[1] == '/'))
    {
      s = skipwhite(s + 2);
      if (*skipwhite(s) == NUL && lnum + 1 < (linenr_T)get_vim_var_nr(VV_FOLDEND))
      {
        s = skipwhite(ml_get(lnum + 1));
        if (*s == '*')
          s = skipwhite(s + 1);
      }
    }
    count = (long)(foldend - foldstart + 1);
    txt = NGETTEXT("+-%s%3ld line: ", "+-%s%3ld lines: ", count);
    r = alloc(STRLEN(txt) + STRLEN(dashes) // for %s
              + 20                         // for %3ld
              + STRLEN(s));                // concatenated
    if (r != NULL)
    {
      sprintf((char *)r, txt, dashes, count);
      len = (int)STRLEN(r);
      STRCAT(r, s);
      /* remove 'foldmarker' and 'commentstring' */
      foldtext_cleanup(r + len);
      rettv->vval.v_string = r;
    }
  }
#endif
}

/*
 * "foldtextresult(lnum)" function
 */
static void
f_foldtextresult(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_FOLDING
  linenr_T lnum;
  char_u *text;
  char_u buf[FOLD_TEXT_LEN];
  foldinfo_T foldinfo;
  int fold_count;
  static int entered = FALSE;
#endif

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;
#ifdef FEAT_FOLDING
  if (entered)
    return; /* reject recursive use */
  entered = TRUE;

  lnum = tv_get_lnum(argvars);
  /* treat illegal types and illegal string values for {lnum} the same */
  if (lnum < 0)
    lnum = 0;
  fold_count = foldedCount(curwin, lnum, &foldinfo);
  if (fold_count > 0)
  {
    text = get_foldtext(curwin, lnum, lnum + fold_count - 1,
                        &foldinfo, buf);
    if (text == buf)
      text = vim_strsave(text);
    rettv->vval.v_string = text;
  }

  entered = FALSE;
#endif
}

/*
 * "foreground()" function
 */
static void
f_foreground(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
}

static void
common_function(typval_T *argvars, typval_T *rettv, int is_funcref)
{
  char_u *s;
  char_u *name;
  int use_string = FALSE;
  partial_T *arg_pt = NULL;
  char_u *trans_name = NULL;

  if (argvars[0].v_type == VAR_FUNC)
  {
    /* function(MyFunc, [arg], dict) */
    s = argvars[0].vval.v_string;
  }
  else if (argvars[0].v_type == VAR_PARTIAL && argvars[0].vval.v_partial != NULL)
  {
    /* function(dict.MyFunc, [arg]) */
    arg_pt = argvars[0].vval.v_partial;
    s = partial_name(arg_pt);
  }
  else
  {
    /* function('MyFunc', [arg], dict) */
    s = tv_get_string(&argvars[0]);
    use_string = TRUE;
  }

  if ((use_string && vim_strchr(s, AUTOLOAD_CHAR) == NULL) || is_funcref)
  {
    name = s;
    trans_name = trans_function_name(&name, FALSE,
                                     TFN_INT | TFN_QUIET | TFN_NO_AUTOLOAD | TFN_NO_DEREF, NULL, NULL);
    if (*name != NUL)
      s = NULL;
  }

  if (s == NULL || *s == NUL || (use_string && VIM_ISDIGIT(*s)) || (is_funcref && trans_name == NULL))
    semsg(_(e_invarg2), use_string ? tv_get_string(&argvars[0]) : s);
  /* Don't check an autoload name for existence here. */
  else if (trans_name != NULL && (is_funcref
                                      ? find_func(trans_name) == NULL
                                      : !translated_function_exists(trans_name)))
    semsg(_("E700: Unknown function: %s"), s);
  else
  {
    int dict_idx = 0;
    int arg_idx = 0;
    list_T *list = NULL;

    if (STRNCMP(s, "s:", 2) == 0 || STRNCMP(s, "<SID>", 5) == 0)
    {
      char sid_buf[25];
      int off = *s == 's' ? 2 : 5;

      /* Expand s: and <SID> into <SNR>nr_, so that the function can
	     * also be called from another script. Using trans_function_name()
	     * would also work, but some plugins depend on the name being
	     * printable text. */
      sprintf(sid_buf, "<SNR>%ld_", (long)current_sctx.sc_sid);
      name = alloc(STRLEN(sid_buf) + STRLEN(s + off) + 1);
      if (name != NULL)
      {
        STRCPY(name, sid_buf);
        STRCAT(name, s + off);
      }
    }
    else
      name = vim_strsave(s);

    if (argvars[1].v_type != VAR_UNKNOWN)
    {
      if (argvars[2].v_type != VAR_UNKNOWN)
      {
        /* function(name, [args], dict) */
        arg_idx = 1;
        dict_idx = 2;
      }
      else if (argvars[1].v_type == VAR_DICT)
        /* function(name, dict) */
        dict_idx = 1;
      else
        /* function(name, [args]) */
        arg_idx = 1;
      if (dict_idx > 0)
      {
        if (argvars[dict_idx].v_type != VAR_DICT)
        {
          emsg(_("E922: expected a dict"));
          vim_free(name);
          goto theend;
        }
        if (argvars[dict_idx].vval.v_dict == NULL)
          dict_idx = 0;
      }
      if (arg_idx > 0)
      {
        if (argvars[arg_idx].v_type != VAR_LIST)
        {
          emsg(_("E923: Second argument of function() must be a list or a dict"));
          vim_free(name);
          goto theend;
        }
        list = argvars[arg_idx].vval.v_list;
        if (list == NULL || list->lv_len == 0)
          arg_idx = 0;
      }
    }
    if (dict_idx > 0 || arg_idx > 0 || arg_pt != NULL || is_funcref)
    {
      partial_T *pt = ALLOC_CLEAR_ONE(partial_T);

      /* result is a VAR_PARTIAL */
      if (pt == NULL)
        vim_free(name);
      else
      {
        if (arg_idx > 0 || (arg_pt != NULL && arg_pt->pt_argc > 0))
        {
          listitem_T *li;
          int i = 0;
          int arg_len = 0;
          int lv_len = 0;

          if (arg_pt != NULL)
            arg_len = arg_pt->pt_argc;
          if (list != NULL)
            lv_len = list->lv_len;
          pt->pt_argc = arg_len + lv_len;
          pt->pt_argv = ALLOC_MULT(typval_T, pt->pt_argc);
          if (pt->pt_argv == NULL)
          {
            vim_free(pt);
            vim_free(name);
            goto theend;
          }
          for (i = 0; i < arg_len; i++)
            copy_tv(&arg_pt->pt_argv[i], &pt->pt_argv[i]);
          if (lv_len > 0)
            for (li = list->lv_first; li != NULL;
                 li = li->li_next)
              copy_tv(&li->li_tv, &pt->pt_argv[i++]);
        }

        /* For "function(dict.func, [], dict)" and "func" is a partial
		 * use "dict".  That is backwards compatible. */
        if (dict_idx > 0)
        {
          /* The dict is bound explicitly, pt_auto is FALSE. */
          pt->pt_dict = argvars[dict_idx].vval.v_dict;
          ++pt->pt_dict->dv_refcount;
        }
        else if (arg_pt != NULL)
        {
          /* If the dict was bound automatically the result is also
		     * bound automatically. */
          pt->pt_dict = arg_pt->pt_dict;
          pt->pt_auto = arg_pt->pt_auto;
          if (pt->pt_dict != NULL)
            ++pt->pt_dict->dv_refcount;
        }

        pt->pt_refcount = 1;
        if (arg_pt != NULL && arg_pt->pt_func != NULL)
        {
          pt->pt_func = arg_pt->pt_func;
          func_ptr_ref(pt->pt_func);
          vim_free(name);
        }
        else if (is_funcref)
        {
          pt->pt_func = find_func(trans_name);
          func_ptr_ref(pt->pt_func);
          vim_free(name);
        }
        else
        {
          pt->pt_name = name;
          func_ref(name);
        }
      }
      rettv->v_type = VAR_PARTIAL;
      rettv->vval.v_partial = pt;
    }
    else
    {
      /* result is a VAR_FUNC */
      rettv->v_type = VAR_FUNC;
      rettv->vval.v_string = name;
      func_ref(name);
    }
  }
theend:
  vim_free(trans_name);
}

/*
 * "funcref()" function
 */
static void
f_funcref(typval_T *argvars, typval_T *rettv)
{
  common_function(argvars, rettv, TRUE);
}

/*
 * "function()" function
 */
static void
f_function(typval_T *argvars, typval_T *rettv)
{
  common_function(argvars, rettv, FALSE);
}

/*
 * "garbagecollect()" function
 */
static void
f_garbagecollect(typval_T *argvars, typval_T *rettv UNUSED)
{
  /* This is postponed until we are back at the toplevel, because we may be
     * using Lists and Dicts internally.  E.g.: ":echo [garbagecollect()]". */
  want_garbage_collect = TRUE;

  if (argvars[0].v_type != VAR_UNKNOWN && tv_get_number(&argvars[0]) == 1)
    garbage_collect_at_exit = TRUE;
}

/*
 * "get()" function
 */
static void
f_get(typval_T *argvars, typval_T *rettv)
{
  listitem_T *li;
  list_T *l;
  dictitem_T *di;
  dict_T *d;
  typval_T *tv = NULL;

  if (argvars[0].v_type == VAR_BLOB)
  {
    int error = FALSE;
    int idx = tv_get_number_chk(&argvars[1], &error);

    if (!error)
    {
      rettv->v_type = VAR_NUMBER;
      if (idx < 0)
        idx = blob_len(argvars[0].vval.v_blob) + idx;
      if (idx < 0 || idx >= blob_len(argvars[0].vval.v_blob))
        rettv->vval.v_number = -1;
      else
      {
        rettv->vval.v_number = blob_get(argvars[0].vval.v_blob, idx);
        tv = rettv;
      }
    }
  }
  else if (argvars[0].v_type == VAR_LIST)
  {
    if ((l = argvars[0].vval.v_list) != NULL)
    {
      int error = FALSE;

      li = list_find(l, (long)tv_get_number_chk(&argvars[1], &error));
      if (!error && li != NULL)
        tv = &li->li_tv;
    }
  }
  else if (argvars[0].v_type == VAR_DICT)
  {
    if ((d = argvars[0].vval.v_dict) != NULL)
    {
      di = dict_find(d, tv_get_string(&argvars[1]), -1);
      if (di != NULL)
        tv = &di->di_tv;
    }
  }
  else if (argvars[0].v_type == VAR_PARTIAL || argvars[0].v_type == VAR_FUNC)
  {
    partial_T *pt;
    partial_T fref_pt;

    if (argvars[0].v_type == VAR_PARTIAL)
      pt = argvars[0].vval.v_partial;
    else
    {
      vim_memset(&fref_pt, 0, sizeof(fref_pt));
      fref_pt.pt_name = argvars[0].vval.v_string;
      pt = &fref_pt;
    }

    if (pt != NULL)
    {
      char_u *what = tv_get_string(&argvars[1]);
      char_u *n;

      if (STRCMP(what, "func") == 0 || STRCMP(what, "name") == 0)
      {
        rettv->v_type = (*what == 'f' ? VAR_FUNC : VAR_STRING);
        n = partial_name(pt);
        if (n == NULL)
          rettv->vval.v_string = NULL;
        else
        {
          rettv->vval.v_string = vim_strsave(n);
          if (rettv->v_type == VAR_FUNC)
            func_ref(rettv->vval.v_string);
        }
      }
      else if (STRCMP(what, "dict") == 0)
        rettv_dict_set(rettv, pt->pt_dict);
      else if (STRCMP(what, "args") == 0)
      {
        rettv->v_type = VAR_LIST;
        if (rettv_list_alloc(rettv) == OK)
        {
          int i;

          for (i = 0; i < pt->pt_argc; ++i)
            list_append_tv(rettv->vval.v_list, &pt->pt_argv[i]);
        }
      }
      else
        semsg(_(e_invarg2), what);
      return;
    }
  }
  else
    semsg(_(e_listdictblobarg), "get()");

  if (tv == NULL)
  {
    if (argvars[2].v_type != VAR_UNKNOWN)
      copy_tv(&argvars[2], rettv);
  }
  else
    copy_tv(tv, rettv);
}

/*
 * Returns buffer options, variables and other attributes in a dictionary.
 */
static dict_T *
get_buffer_info(buf_T *buf)
{
  dict_T *dict;
  tabpage_T *tp;
  win_T *wp;
  list_T *windows;

  dict = dict_alloc();
  if (dict == NULL)
    return NULL;

  dict_add_number(dict, "bufnr", buf->b_fnum);
  dict_add_string(dict, "name", buf->b_ffname);
  dict_add_number(dict, "lnum", buf == curbuf ? curwin->w_cursor.lnum : buflist_findlnum(buf));
  dict_add_number(dict, "loaded", buf->b_ml.ml_mfp != NULL);
  dict_add_number(dict, "listed", buf->b_p_bl);
  dict_add_number(dict, "changed", bufIsChanged(buf));
  dict_add_number(dict, "changedtick", CHANGEDTICK(buf));
  dict_add_number(dict, "hidden",
                  buf->b_ml.ml_mfp != NULL && buf->b_nwindows == 0);

  /* Get a reference to buffer variables */
  dict_add_dict(dict, "variables", buf->b_vars);

  /* List of windows displaying this buffer */
  windows = list_alloc();
  if (windows != NULL)
  {
    FOR_ALL_TAB_WINDOWS(tp, wp)
    if (wp->w_buffer == buf)
      list_append_number(windows, (varnumber_T)wp->w_id);
    dict_add_list(dict, "windows", windows);
  }

#ifdef FEAT_SIGNS
  if (buf->b_signlist != NULL)
  {
    /* List of signs placed in this buffer */
    list_T *signs = list_alloc();
    if (signs != NULL)
    {
      get_buffer_signs(buf, signs);
      dict_add_list(dict, "signs", signs);
    }
  }
#endif

  return dict;
}

/*
 * "getbufinfo()" function
 */
static void
f_getbufinfo(typval_T *argvars, typval_T *rettv)
{
  buf_T *buf = NULL;
  buf_T *argbuf = NULL;
  dict_T *d;
  int filtered = FALSE;
  int sel_buflisted = FALSE;
  int sel_bufloaded = FALSE;
  int sel_bufmodified = FALSE;

  if (rettv_list_alloc(rettv) != OK)
    return;

  /* List of all the buffers or selected buffers */
  if (argvars[0].v_type == VAR_DICT)
  {
    dict_T *sel_d = argvars[0].vval.v_dict;

    if (sel_d != NULL)
    {
      dictitem_T *di;

      filtered = TRUE;

      di = dict_find(sel_d, (char_u *)"buflisted", -1);
      if (di != NULL && tv_get_number(&di->di_tv))
        sel_buflisted = TRUE;

      di = dict_find(sel_d, (char_u *)"bufloaded", -1);
      if (di != NULL && tv_get_number(&di->di_tv))
        sel_bufloaded = TRUE;

      di = dict_find(sel_d, (char_u *)"bufmodified", -1);
      if (di != NULL && tv_get_number(&di->di_tv))
        sel_bufmodified = TRUE;
    }
  }
  else if (argvars[0].v_type != VAR_UNKNOWN)
  {
    /* Information about one buffer.  Argument specifies the buffer */
    (void)tv_get_number(&argvars[0]); /* issue errmsg if type error */
    ++emsg_off;
    argbuf = tv_get_buf(&argvars[0], FALSE);
    --emsg_off;
    if (argbuf == NULL)
      return;
  }

  /* Return information about all the buffers or a specified buffer */
  FOR_ALL_BUFFERS(buf)
  {
    if (argbuf != NULL && argbuf != buf)
      continue;
    if (filtered && ((sel_bufloaded && buf->b_ml.ml_mfp == NULL) || (sel_buflisted && !buf->b_p_bl) || (sel_bufmodified && !buf->b_changed)))
      continue;

    d = get_buffer_info(buf);
    if (d != NULL)
      list_append_dict(rettv->vval.v_list, d);
    if (argbuf != NULL)
      return;
  }
}

/*
 * Get line or list of lines from buffer "buf" into "rettv".
 * Return a range (from start to end) of lines in rettv from the specified
 * buffer.
 * If 'retlist' is TRUE, then the lines are returned as a Vim List.
 */
static void
get_buffer_lines(
    buf_T *buf,
    linenr_T start,
    linenr_T end,
    int retlist,
    typval_T *rettv)
{
  char_u *p;

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;
  if (retlist && rettv_list_alloc(rettv) == FAIL)
    return;

  if (buf == NULL || buf->b_ml.ml_mfp == NULL || start < 0)
    return;

  if (!retlist)
  {
    if (start >= 1 && start <= buf->b_ml.ml_line_count)
      p = ml_get_buf(buf, start, FALSE);
    else
      p = (char_u *)"";
    rettv->vval.v_string = vim_strsave(p);
  }
  else
  {
    if (end < start)
      return;

    if (start < 1)
      start = 1;
    if (end > buf->b_ml.ml_line_count)
      end = buf->b_ml.ml_line_count;
    while (start <= end)
      if (list_append_string(rettv->vval.v_list,
                             ml_get_buf(buf, start++, FALSE), -1) == FAIL)
        break;
  }
}

/*
 * "getbufline()" function
 */
static void
f_getbufline(typval_T *argvars, typval_T *rettv)
{
  linenr_T lnum;
  linenr_T end;
  buf_T *buf;

  (void)tv_get_number(&argvars[0]); /* issue errmsg if type error */
  ++emsg_off;
  buf = tv_get_buf(&argvars[0], FALSE);
  --emsg_off;

  lnum = tv_get_lnum_buf(&argvars[1], buf);
  if (argvars[2].v_type == VAR_UNKNOWN)
    end = lnum;
  else
    end = tv_get_lnum_buf(&argvars[2], buf);

  get_buffer_lines(buf, lnum, end, TRUE, rettv);
}

/*
 * "getbufvar()" function
 */
static void
f_getbufvar(typval_T *argvars, typval_T *rettv)
{
  buf_T *buf;
  buf_T *save_curbuf;
  char_u *varname;
  dictitem_T *v;
  int done = FALSE;

  (void)tv_get_number(&argvars[0]); /* issue errmsg if type error */
  varname = tv_get_string_chk(&argvars[1]);
  ++emsg_off;
  buf = tv_get_buf(&argvars[0], FALSE);

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;

  if (buf != NULL && varname != NULL)
  {
    /* set curbuf to be our buf, temporarily */
    save_curbuf = curbuf;
    curbuf = buf;

    if (*varname == '&')
    {
      if (varname[1] == NUL)
      {
        /* get all buffer-local options in a dict */
        dict_T *opts = get_winbuf_options(TRUE);

        if (opts != NULL)
        {
          rettv_dict_set(rettv, opts);
          done = TRUE;
        }
      }
      else if (get_option_tv(&varname, rettv, TRUE) == OK)
        /* buffer-local-option */
        done = TRUE;
    }
    else
    {
      /* Look up the variable. */
      /* Let getbufvar({nr}, "") return the "b:" dictionary. */
      v = find_var_in_ht(&curbuf->b_vars->dv_hashtab,
                         'b', varname, FALSE);
      if (v != NULL)
      {
        copy_tv(&v->di_tv, rettv);
        done = TRUE;
      }
    }

    /* restore previous notion of curbuf */
    curbuf = save_curbuf;
  }

  if (!done && argvars[2].v_type != VAR_UNKNOWN)
    /* use the default value */
    copy_tv(&argvars[2], rettv);

  --emsg_off;
}

/*
 * "getchangelist()" function
 */
static void
f_getchangelist(typval_T *argvars, typval_T *rettv)
{
#ifdef FEAT_JUMPLIST
  buf_T *buf;
  int i;
  list_T *l;
  dict_T *d;
#endif

  if (rettv_list_alloc(rettv) != OK)
    return;

#ifdef FEAT_JUMPLIST
  (void)tv_get_number(&argvars[0]); /* issue errmsg if type error */
  ++emsg_off;
  buf = tv_get_buf(&argvars[0], FALSE);
  --emsg_off;
  if (buf == NULL)
    return;

  l = list_alloc();
  if (l == NULL)
    return;

  if (list_append_list(rettv->vval.v_list, l) == FAIL)
    return;
  /*
     * The current window change list index tracks only the position in the
     * current buffer change list. For other buffers, use the change list
     * length as the current index.
     */
  list_append_number(rettv->vval.v_list,
                     (varnumber_T)((buf == curwin->w_buffer)
                                       ? curwin->w_changelistidx
                                       : buf->b_changelistlen));

  for (i = 0; i < buf->b_changelistlen; ++i)
  {
    if (buf->b_changelist[i].lnum == 0)
      continue;
    if ((d = dict_alloc()) == NULL)
      return;
    if (list_append_dict(l, d) == FAIL)
      return;
    dict_add_number(d, "lnum", (long)buf->b_changelist[i].lnum);
    dict_add_number(d, "col", (long)buf->b_changelist[i].col);
    dict_add_number(d, "coladd", (long)buf->b_changelist[i].coladd);
  }
#endif
}
/*
 * "getchar()" function
 */
static void
f_getchar(typval_T *argvars, typval_T *rettv)
{
  varnumber_T n = 0;
  int error = FALSE;
  int mode = -1; //
  if (argvars[0].v_type == VAR_UNKNOWN)
  {
    mode = -1;
  }
  else if (tv_get_number_chk(&argvars[0], &error) == 1)
  {
    mode = 1;
  }
  else
  {
    mode = 0;
  }

  if (functionGetCharCallback != NULL && error == FALSE)
  {
    char outChar;
    int outModMask;
    int result = functionGetCharCallback(mode, &outChar, &outModMask);

    if (result == OK)
    {
      n = outChar;
      mod_mask = outModMask;
    }
  }

  set_vim_var_nr(VV_MOUSE_WIN, 0);
  set_vim_var_nr(VV_MOUSE_WINID, 0);
  set_vim_var_nr(VV_MOUSE_LNUM, 0);
  set_vim_var_nr(VV_MOUSE_COL, 0);

  rettv->vval.v_number = n;
  if (IS_SPECIAL(n) || mod_mask != 0)
  {
    char_u temp[10]; /* modifier: 3, mbyte-char: 6, NUL: 1 */
    int i = 0;

    /* Turn a special key into three bytes, plus modifier. */
    if (mod_mask != 0)
    {
      temp[i++] = K_SPECIAL;
      temp[i++] = KS_MODIFIER;
      temp[i++] = mod_mask;
    }
    if (IS_SPECIAL(n))
    {
      temp[i++] = K_SPECIAL;
      temp[i++] = K_SECOND(n);
      temp[i++] = K_THIRD(n);
    }
    else if (has_mbyte)
      i += (*mb_char2bytes)(n, temp + i);
    else
      temp[i++] = n;
    temp[i++] = NUL;
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = vim_strsave(temp);
  }
}

/*
 * "getcharmod()" function
 */
static void
f_getcharmod(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->vval.v_number = mod_mask;
}

/*
 * "getcharsearch()" function
 */
static void
f_getcharsearch(typval_T *argvars UNUSED, typval_T *rettv)
{
  if (rettv_dict_alloc(rettv) != FAIL)
  {
    dict_T *dict = rettv->vval.v_dict;

    dict_add_string(dict, "char", last_csearch());
    dict_add_number(dict, "forward", last_csearch_forward());
    dict_add_number(dict, "until", last_csearch_until());
  }
}

/*
 * "getcmdline()" function
 */
static void
f_getcmdline(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = get_cmdline_str();
}

/*
 * "getcmdpos()" function
 */
static void
f_getcmdpos(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->vval.v_number = get_cmdline_pos() + 1;
}

/*
 * "getcmdtype()" function
 */
static void
f_getcmdtype(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = alloc(2);
  if (rettv->vval.v_string != NULL)
  {
    rettv->vval.v_string[0] = get_cmdline_type();
    rettv->vval.v_string[1] = NUL;
  }
}

/*
 * "getcmdwintype()" function
 */
static void
f_getcmdwintype(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;
}

#if defined(FEAT_CMDL_COMPL)
/*
 * "getcompletion()" function
 */
static void
f_getcompletion(typval_T *argvars, typval_T *rettv)
{
  char_u *pat;
  expand_T xpc;
  int filtered = FALSE;
  int options = WILD_SILENT | WILD_USE_NL | WILD_ADD_SLASH | WILD_NO_BEEP;

  if (argvars[2].v_type != VAR_UNKNOWN)
    filtered = tv_get_number_chk(&argvars[2], NULL);

  if (p_wic)
    options |= WILD_ICASE;

  /* For filtered results, 'wildignore' is used */
  if (!filtered)
    options |= WILD_KEEP_ALL;

  ExpandInit(&xpc);
  xpc.xp_pattern = tv_get_string(&argvars[0]);
  xpc.xp_pattern_len = (int)STRLEN(xpc.xp_pattern);
  xpc.xp_context = cmdcomplete_str_to_type(tv_get_string(&argvars[1]));
  if (xpc.xp_context == EXPAND_NOTHING)
  {
    if (argvars[1].v_type == VAR_STRING)
      semsg(_(e_invarg2), argvars[1].vval.v_string);
    else
      emsg(_(e_invarg));
    return;
  }

#ifdef FEAT_SIGNS
  if (xpc.xp_context == EXPAND_SIGN)
  {
    set_context_in_sign_cmd(&xpc, xpc.xp_pattern);
    xpc.xp_pattern_len = (int)STRLEN(xpc.xp_pattern);
  }
#endif

  pat = addstar(xpc.xp_pattern, xpc.xp_pattern_len, xpc.xp_context);
  if ((rettv_list_alloc(rettv) != FAIL) && (pat != NULL))
  {
    int i;

    ExpandOne(&xpc, pat, NULL, options, WILD_ALL_KEEP);

    for (i = 0; i < xpc.xp_numfiles; i++)
      list_append_string(rettv->vval.v_list, xpc.xp_files[i], -1);
  }
  vim_free(pat);
  ExpandCleanup(&xpc);
}
#endif

/*
 * "getcwd()" function
 *
 * Return the current working directory of a window in a tab page.
 * First optional argument 'winnr' is the window number or -1 and the second
 * optional argument 'tabnr' is the tab page number.
 *
 * If no arguments are supplied, then return the directory of the current
 * window.
 * If only 'winnr' is specified and is not -1 or 0 then return the directory of
 * the specified window.
 * If 'winnr' is 0 then return the directory of the current window.
 * If both 'winnr and 'tabnr' are specified and 'winnr' is -1 then return the
 * directory of the specified tab page.  Otherwise return the directory of the
 * specified window in the specified tab page.
 * If the window or the tab page doesn't exist then return NULL.
 */
static void
f_getcwd(typval_T *argvars, typval_T *rettv)
{
  win_T *wp = NULL;
  tabpage_T *tp = NULL;
  char_u *cwd;
  int global = FALSE;

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;

  if (argvars[0].v_type == VAR_NUMBER && argvars[0].vval.v_number == -1 && argvars[1].v_type == VAR_UNKNOWN)
    global = TRUE;
  else
    wp = find_tabwin(&argvars[0], &argvars[1], &tp);

  if (wp != NULL && wp->w_localdir != NULL)
    rettv->vval.v_string = vim_strsave(wp->w_localdir);
  else if (tp != NULL && tp->tp_localdir != NULL)
    rettv->vval.v_string = vim_strsave(tp->tp_localdir);
  else if (wp != NULL || tp != NULL || global)
  {
    if (globaldir != NULL)
      rettv->vval.v_string = vim_strsave(globaldir);
    else
    {
      cwd = alloc(MAXPATHL);
      if (cwd != NULL)
      {
        if (mch_dirname(cwd, MAXPATHL) != FAIL)
          rettv->vval.v_string = vim_strsave(cwd);
        vim_free(cwd);
      }
    }
  }
#ifdef BACKSLASH_IN_FILENAME
  if (rettv->vval.v_string != NULL)
    slash_adjust(rettv->vval.v_string);
#endif
}

/*
 * "getenv()" function
 */
static void
f_getenv(typval_T *argvars, typval_T *rettv)
{
  int mustfree = FALSE;
  char_u *p = vim_getenv(tv_get_string(&argvars[0]), &mustfree);

  if (p == NULL)
  {
    rettv->v_type = VAR_SPECIAL;
    rettv->vval.v_number = VVAL_NULL;
    return;
  }
  if (!mustfree)
    p = vim_strsave(p);
  rettv->vval.v_string = p;
  rettv->v_type = VAR_STRING;
}

/*
 * "getfontname()" function
 */
static void
f_getfontname(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;
}

/*
 * "getfperm({fname})" function
 */
static void
f_getfperm(typval_T *argvars, typval_T *rettv)
{
  char_u *fname;
  stat_T st;
  char_u *perm = NULL;
  char_u flags[] = "rwx";
  int i;

  fname = tv_get_string(&argvars[0]);

  rettv->v_type = VAR_STRING;
  if (mch_stat((char *)fname, &st) >= 0)
  {
    perm = vim_strsave((char_u *)"---------");
    if (perm != NULL)
    {
      for (i = 0; i < 9; i++)
      {
        if (st.st_mode & (1 << (8 - i)))
          perm[i] = flags[i % 3];
      }
    }
  }
  rettv->vval.v_string = perm;
}

/*
 * "getfsize({fname})" function
 */
static void
f_getfsize(typval_T *argvars, typval_T *rettv)
{
  char_u *fname;
  stat_T st;

  fname = tv_get_string(&argvars[0]);

  rettv->v_type = VAR_NUMBER;

  if (mch_stat((char *)fname, &st) >= 0)
  {
    if (mch_isdir(fname))
      rettv->vval.v_number = 0;
    else
    {
      rettv->vval.v_number = (varnumber_T)st.st_size;

      /* non-perfect check for overflow */
      if ((off_T)rettv->vval.v_number != (off_T)st.st_size)
        rettv->vval.v_number = -2;
    }
  }
  else
    rettv->vval.v_number = -1;
}

/*
 * "getftime({fname})" function
 */
static void
f_getftime(typval_T *argvars, typval_T *rettv)
{
  char_u *fname;
  stat_T st;

  fname = tv_get_string(&argvars[0]);

  if (mch_stat((char *)fname, &st) >= 0)
    rettv->vval.v_number = (varnumber_T)st.st_mtime;
  else
    rettv->vval.v_number = -1;
}

/*
 * "getftype({fname})" function
 */
static void
f_getftype(typval_T *argvars, typval_T *rettv)
{
  char_u *fname;
  stat_T st;
  char_u *type = NULL;
  char *t;

  fname = tv_get_string(&argvars[0]);

  rettv->v_type = VAR_STRING;
  if (mch_lstat((char *)fname, &st) >= 0)
  {
    if (S_ISREG(st.st_mode))
      t = "file";
    else if (S_ISDIR(st.st_mode))
      t = "dir";
    else if (S_ISLNK(st.st_mode))
      t = "link";
    else if (S_ISBLK(st.st_mode))
      t = "bdev";
    else if (S_ISCHR(st.st_mode))
      t = "cdev";
    else if (S_ISFIFO(st.st_mode))
      t = "fifo";
    else if (S_ISSOCK(st.st_mode))
      t = "socket";
    else
      t = "other";
    type = vim_strsave((char_u *)t);
  }
  rettv->vval.v_string = type;
}

/*
 * "getjumplist()" function
 */
static void
f_getjumplist(typval_T *argvars, typval_T *rettv)
{
#ifdef FEAT_JUMPLIST
  win_T *wp;
  int i;
  list_T *l;
  dict_T *d;
#endif

  if (rettv_list_alloc(rettv) != OK)
    return;

#ifdef FEAT_JUMPLIST
  wp = find_tabwin(&argvars[0], &argvars[1], NULL);
  if (wp == NULL)
    return;

  cleanup_jumplist(wp, TRUE);

  l = list_alloc();
  if (l == NULL)
    return;

  if (list_append_list(rettv->vval.v_list, l) == FAIL)
    return;
  list_append_number(rettv->vval.v_list, (varnumber_T)wp->w_jumplistidx);

  for (i = 0; i < wp->w_jumplistlen; ++i)
  {
    if (wp->w_jumplist[i].fmark.mark.lnum == 0)
      continue;
    if ((d = dict_alloc()) == NULL)
      return;
    if (list_append_dict(l, d) == FAIL)
      return;
    dict_add_number(d, "lnum", (long)wp->w_jumplist[i].fmark.mark.lnum);
    dict_add_number(d, "col", (long)wp->w_jumplist[i].fmark.mark.col);
    dict_add_number(d, "coladd", (long)wp->w_jumplist[i].fmark.mark.coladd);
    dict_add_number(d, "bufnr", (long)wp->w_jumplist[i].fmark.fnum);
    if (wp->w_jumplist[i].fname != NULL)
      dict_add_string(d, "filename", wp->w_jumplist[i].fname);
  }
#endif
}

/*
 * "getline(lnum, [end])" function
 */
static void
f_getline(typval_T *argvars, typval_T *rettv)
{
  linenr_T lnum;
  linenr_T end;
  int retlist;

  lnum = tv_get_lnum(argvars);
  if (argvars[1].v_type == VAR_UNKNOWN)
  {
    end = 0;
    retlist = FALSE;
  }
  else
  {
    end = tv_get_lnum(&argvars[1]);
    retlist = TRUE;
  }

  get_buffer_lines(curbuf, lnum, end, retlist, rettv);
}

#ifdef FEAT_QUICKFIX
static void
get_qf_loc_list(int is_qf, win_T *wp, typval_T *what_arg, typval_T *rettv)
{
  if (what_arg->v_type == VAR_UNKNOWN)
  {
    if (rettv_list_alloc(rettv) == OK)
      if (is_qf || wp != NULL)
        (void)get_errorlist(NULL, wp, -1, rettv->vval.v_list);
  }
  else
  {
    if (rettv_dict_alloc(rettv) == OK)
      if (is_qf || (wp != NULL))
      {
        if (what_arg->v_type == VAR_DICT)
        {
          dict_T *d = what_arg->vval.v_dict;

          if (d != NULL)
            qf_get_properties(wp, d, rettv->vval.v_dict);
        }
        else
          emsg(_(e_dictreq));
      }
  }
}
#endif

/*
 * "getloclist()" function
 */
static void
f_getloclist(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_QUICKFIX
  win_T *wp;

  wp = find_win_by_nr_or_id(&argvars[0]);
  get_qf_loc_list(FALSE, wp, &argvars[1], rettv);
#endif
}

/*
 * "getmatches()" function
 */
static void
f_getmatches(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_SEARCH_EXTRA
  dict_T *dict;
  matchitem_T *cur;
  int i;
  win_T *win = get_optional_window(argvars, 0);

  if (rettv_list_alloc(rettv) == FAIL || win == NULL)
    return;

  cur = win->w_match_head;
  while (cur != NULL)
  {
    dict = dict_alloc();
    if (dict == NULL)
      return;
    if (cur->match.regprog == NULL)
    {
      /* match added with matchaddpos() */
      for (i = 0; i < MAXPOSMATCH; ++i)
      {
        llpos_T *llpos;
        char buf[30]; // use 30 to avoid compiler warning
        list_T *l;

        llpos = &cur->pos.pos[i];
        if (llpos->lnum == 0)
          break;
        l = list_alloc();
        if (l == NULL)
          break;
        list_append_number(l, (varnumber_T)llpos->lnum);
        if (llpos->col > 0)
        {
          list_append_number(l, (varnumber_T)llpos->col);
          list_append_number(l, (varnumber_T)llpos->len);
        }
        sprintf(buf, "pos%d", i + 1);
        dict_add_list(dict, buf, l);
      }
    }
    else
    {
      dict_add_string(dict, "pattern", cur->pattern);
    }
    dict_add_string(dict, "group", syn_id2name(cur->hlg_id));
    dict_add_number(dict, "priority", (long)cur->priority);
    dict_add_number(dict, "id", (long)cur->id);
    list_append_dict(rettv->vval.v_list, dict);
    cur = cur->next;
  }
#endif
}

/*
 * "getpid()" function
 */
static void
f_getpid(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->vval.v_number = mch_get_pid();
}

static void
getpos_both(
    typval_T *argvars,
    typval_T *rettv,
    int getcurpos)
{
  pos_T *fp;
  list_T *l;
  int fnum = -1;

  if (rettv_list_alloc(rettv) == OK)
  {
    l = rettv->vval.v_list;
    if (getcurpos)
      fp = &curwin->w_cursor;
    else
      fp = var2fpos(&argvars[0], TRUE, &fnum);
    if (fnum != -1)
      list_append_number(l, (varnumber_T)fnum);
    else
      list_append_number(l, (varnumber_T)0);
    list_append_number(l, (fp != NULL) ? (varnumber_T)fp->lnum
                                       : (varnumber_T)0);
    list_append_number(l, (fp != NULL)
                              ? (varnumber_T)(fp->col == MAXCOL ? MAXCOL : fp->col + 1)
                              : (varnumber_T)0);
    list_append_number(l, (fp != NULL) ? (varnumber_T)fp->coladd : (varnumber_T)0);
    if (getcurpos)
    {
      int save_set_curswant = curwin->w_set_curswant;
      colnr_T save_curswant = curwin->w_curswant;
      colnr_T save_virtcol = curwin->w_virtcol;

      update_curswant();
      list_append_number(l, curwin->w_curswant == MAXCOL ? (varnumber_T)MAXCOL : (varnumber_T)curwin->w_curswant + 1);

      // Do not change "curswant", as it is unexpected that a get
      // function has a side effect.
      if (save_set_curswant)
      {
        curwin->w_set_curswant = save_set_curswant;
        curwin->w_curswant = save_curswant;
        curwin->w_virtcol = save_virtcol;
        curwin->w_valid &= ~VALID_VIRTCOL;
      }
    }
  }
  else
    rettv->vval.v_number = FALSE;
}

/*
 * "getcurpos()" function
 */
static void
f_getcurpos(typval_T *argvars, typval_T *rettv)
{
  getpos_both(argvars, rettv, TRUE);
}

/*
 * "getpos(string)" function
 */
static void
f_getpos(typval_T *argvars, typval_T *rettv)
{
  getpos_both(argvars, rettv, FALSE);
}

/*
 * "getqflist()" function
 */
static void
f_getqflist(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_QUICKFIX
  get_qf_loc_list(TRUE, NULL, &argvars[0], rettv);
#endif
}

/*
 * "getreg()" function
 */
static void
f_getreg(typval_T *argvars, typval_T *rettv)
{
  char_u *strregname;
  int regname;
  int arg2 = FALSE;
  int return_list = FALSE;
  int error = FALSE;

  if (argvars[0].v_type != VAR_UNKNOWN)
  {
    strregname = tv_get_string_chk(&argvars[0]);
    error = strregname == NULL;
    if (argvars[1].v_type != VAR_UNKNOWN)
    {
      arg2 = (int)tv_get_number_chk(&argvars[1], &error);
      if (!error && argvars[2].v_type != VAR_UNKNOWN)
        return_list = (int)tv_get_number_chk(&argvars[2], &error);
    }
  }
  else
    strregname = get_vim_var_str(VV_REG);

  if (error)
    return;

  regname = (strregname == NULL ? '"' : *strregname);
  if (regname == 0)
    regname = '"';

  if (return_list)
  {
    rettv->v_type = VAR_LIST;
    rettv->vval.v_list = (list_T *)get_reg_contents(regname,
                                                    (arg2 ? GREG_EXPR_SRC : 0) | GREG_LIST);
    if (rettv->vval.v_list == NULL)
      (void)rettv_list_alloc(rettv);
    else
      ++rettv->vval.v_list->lv_refcount;
  }
  else
  {
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = get_reg_contents(regname,
                                            arg2 ? GREG_EXPR_SRC : 0);
  }
}

/*
 * "getregtype()" function
 */
static void
f_getregtype(typval_T *argvars, typval_T *rettv)
{
  char_u *strregname;
  int regname;
  char_u buf[NUMBUFLEN + 2];
  long reglen = 0;

  if (argvars[0].v_type != VAR_UNKNOWN)
  {
    strregname = tv_get_string_chk(&argvars[0]);
    if (strregname == NULL) /* type error; errmsg already given */
    {
      rettv->v_type = VAR_STRING;
      rettv->vval.v_string = NULL;
      return;
    }
  }
  else
    /* Default to v:register */
    strregname = get_vim_var_str(VV_REG);

  regname = (strregname == NULL ? '"' : *strregname);
  if (regname == 0)
    regname = '"';

  buf[0] = NUL;
  buf[1] = NUL;
  switch (get_reg_type(regname, &reglen))
  {
  case MLINE:
    buf[0] = 'V';
    break;
  case MCHAR:
    buf[0] = 'v';
    break;
  case MBLOCK:
    buf[0] = Ctrl_V;
    sprintf((char *)buf + 1, "%ld", reglen + 1);
    break;
  }
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = vim_strsave(buf);
}

/*
 * Returns information (variables, options, etc.) about a tab page
 * as a dictionary.
 */
static dict_T *
get_tabpage_info(tabpage_T *tp, int tp_idx)
{
  win_T *wp;
  dict_T *dict;
  list_T *l;

  dict = dict_alloc();
  if (dict == NULL)
    return NULL;

  dict_add_number(dict, "tabnr", tp_idx);

  l = list_alloc();
  if (l != NULL)
  {
    for (wp = (tp == curtab) ? firstwin : tp->tp_firstwin;
         wp; wp = wp->w_next)
      list_append_number(l, (varnumber_T)wp->w_id);
    dict_add_list(dict, "windows", l);
  }

  /* Make a reference to tabpage variables */
  dict_add_dict(dict, "variables", tp->tp_vars);

  return dict;
}

/*
 * "gettabinfo()" function
 */
static void
f_gettabinfo(typval_T *argvars, typval_T *rettv)
{
  tabpage_T *tp, *tparg = NULL;
  dict_T *d;
  int tpnr = 0;

  if (rettv_list_alloc(rettv) != OK)
    return;

  if (argvars[0].v_type != VAR_UNKNOWN)
  {
    /* Information about one tab page */
    tparg = find_tabpage((int)tv_get_number_chk(&argvars[0], NULL));
    if (tparg == NULL)
      return;
  }

  /* Get information about a specific tab page or all tab pages */
  FOR_ALL_TABPAGES(tp)
  {
    tpnr++;
    if (tparg != NULL && tp != tparg)
      continue;
    d = get_tabpage_info(tp, tpnr);
    if (d != NULL)
      list_append_dict(rettv->vval.v_list, d);
    if (tparg != NULL)
      return;
  }
}

/*
 * "gettabvar()" function
 */
static void
f_gettabvar(typval_T *argvars, typval_T *rettv)
{
  win_T *oldcurwin;
  tabpage_T *tp, *oldtabpage;
  dictitem_T *v;
  char_u *varname;
  int done = FALSE;

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;

  varname = tv_get_string_chk(&argvars[1]);
  tp = find_tabpage((int)tv_get_number_chk(&argvars[0], NULL));
  if (tp != NULL && varname != NULL)
  {
    /* Set tp to be our tabpage, temporarily.  Also set the window to the
	 * first window in the tabpage, otherwise the window is not valid. */
    if (switch_win(&oldcurwin, &oldtabpage,
                   tp == curtab || tp->tp_firstwin == NULL ? firstwin
                                                           : tp->tp_firstwin,
                   tp, TRUE) == OK)
    {
      /* look up the variable */
      /* Let gettabvar({nr}, "") return the "t:" dictionary. */
      v = find_var_in_ht(&tp->tp_vars->dv_hashtab, 't', varname, FALSE);
      if (v != NULL)
      {
        copy_tv(&v->di_tv, rettv);
        done = TRUE;
      }
    }

    /* restore previous notion of curwin */
    restore_win(oldcurwin, oldtabpage, TRUE);
  }

  if (!done && argvars[2].v_type != VAR_UNKNOWN)
    copy_tv(&argvars[2], rettv);
}

/*
 * "gettabwinvar()" function
 */
static void
f_gettabwinvar(typval_T *argvars, typval_T *rettv)
{
  getwinvar(argvars, rettv, 1);
}

/*
 * "gettagstack()" function
 */
static void
f_gettagstack(typval_T *argvars, typval_T *rettv)
{
  win_T *wp = curwin; // default is current window

  if (rettv_dict_alloc(rettv) != OK)
    return;

  if (argvars[0].v_type != VAR_UNKNOWN)
  {
    wp = find_win_by_nr_or_id(&argvars[0]);
    if (wp == NULL)
      return;
  }

  get_tagstack(wp, rettv->vval.v_dict);
}

/*
 * Returns information about a window as a dictionary.
 */
static dict_T *
get_win_info(win_T *wp, short tpnr, short winnr)
{
  dict_T *dict;

  dict = dict_alloc();
  if (dict == NULL)
    return NULL;

  dict_add_number(dict, "tabnr", tpnr);
  dict_add_number(dict, "winnr", winnr);
  dict_add_number(dict, "winid", wp->w_id);
  dict_add_number(dict, "height", wp->w_height);
  dict_add_number(dict, "winrow", wp->w_winrow + 1);
  dict_add_number(dict, "topline", wp->w_topline);
  dict_add_number(dict, "botline", wp->w_botline - 1);
  dict_add_number(dict, "width", wp->w_width);
  dict_add_number(dict, "wincol", wp->w_wincol + 1);
  dict_add_number(dict, "bufnr", wp->w_buffer->b_fnum);

#ifdef FEAT_TERMINAL
  dict_add_number(dict, "terminal", bt_terminal(wp->w_buffer));
#endif
#ifdef FEAT_QUICKFIX
  dict_add_number(dict, "quickfix", bt_quickfix(wp->w_buffer));
  dict_add_number(dict, "loclist",
                  (bt_quickfix(wp->w_buffer) && wp->w_llist_ref != NULL));
#endif

  /* Add a reference to window variables */
  dict_add_dict(dict, "variables", wp->w_vars);

  return dict;
}

/*
 * "getwininfo()" function
 */
static void
f_getwininfo(typval_T *argvars, typval_T *rettv)
{
  tabpage_T *tp;
  win_T *wp = NULL, *wparg = NULL;
  dict_T *d;
  short tabnr = 0, winnr;

  if (rettv_list_alloc(rettv) != OK)
    return;

  if (argvars[0].v_type != VAR_UNKNOWN)
  {
    wparg = win_id2wp(tv_get_number(&argvars[0]));
    if (wparg == NULL)
      return;
  }

  /* Collect information about either all the windows across all the tab
     * pages or one particular window.
     */
  FOR_ALL_TABPAGES(tp)
  {
    tabnr++;
    winnr = 0;
    FOR_ALL_WINDOWS_IN_TAB(tp, wp)
    {
      winnr++;
      if (wparg != NULL && wp != wparg)
        continue;
      d = get_win_info(wp, tabnr, winnr);
      if (d != NULL)
        list_append_dict(rettv->vval.v_list, d);
      if (wparg != NULL)
        /* found information about a specific window */
        return;
    }
  }
}

/*
 * "win_execute()" function
 */
static void
f_win_execute(typval_T *argvars, typval_T *rettv)
{
  int id = (int)tv_get_number(argvars);
  win_T *wp = win_id2wp(id);
  win_T *save_curwin;
  tabpage_T *save_curtab;

  if (wp != NULL)
  {
    if (switch_win_noblock(&save_curwin, &save_curtab, wp, curtab, TRUE) == OK)
    {
      check_cursor();
      execute_common(argvars, rettv, 1);
    }
    restore_win_noblock(save_curwin, save_curtab, TRUE);
  }
}

/*
 * "win_findbuf()" function
 */
static void
f_win_findbuf(typval_T *argvars, typval_T *rettv)
{
  if (rettv_list_alloc(rettv) != FAIL)
    win_findbuf(argvars, rettv->vval.v_list);
}

/*
 * "win_getid()" function
 */
static void
f_win_getid(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = win_getid(argvars);
}

/*
 * "win_gotoid()" function
 */
static void
f_win_gotoid(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = win_gotoid(argvars);
}

/*
 * "win_id2tabwin()" function
 */
static void
f_win_id2tabwin(typval_T *argvars, typval_T *rettv)
{
  if (rettv_list_alloc(rettv) != FAIL)
    win_id2tabwin(argvars, rettv->vval.v_list);
}

/*
 * "win_id2win()" function
 */
static void
f_win_id2win(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = win_id2win(argvars);
}

/*
 * "win_screenpos()" function
 */
static void
f_win_screenpos(typval_T *argvars, typval_T *rettv)
{
  win_T *wp;

  if (rettv_list_alloc(rettv) == FAIL)
    return;

  wp = find_win_by_nr_or_id(&argvars[0]);
  list_append_number(rettv->vval.v_list, wp == NULL ? 0 : wp->w_winrow + 1);
  list_append_number(rettv->vval.v_list, wp == NULL ? 0 : wp->w_wincol + 1);
}

/*
 * "getwinpos({timeout})" function
 */
static void
f_getwinpos(typval_T *argvars UNUSED, typval_T *rettv)
{
  int x = -1;
  int y = -1;

  if (rettv_list_alloc(rettv) == FAIL)
    return;
  list_append_number(rettv->vval.v_list, (varnumber_T)x);
  list_append_number(rettv->vval.v_list, (varnumber_T)y);
}

/*
 * "getwinposx()" function
 */
static void
f_getwinposx(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->vval.v_number = -1;
}

/*
 * "getwinposy()" function
 */
static void
f_getwinposy(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->vval.v_number = -1;
}

/*
 * "getwinvar()" function
 */
static void
f_getwinvar(typval_T *argvars, typval_T *rettv)
{
  getwinvar(argvars, rettv, 0);
}

/*
 * "glob()" function
 */
static void
f_glob(typval_T *argvars, typval_T *rettv)
{
  int options = WILD_SILENT | WILD_USE_NL;
  expand_T xpc;
  int error = FALSE;

  /* When the optional second argument is non-zero, don't remove matches
     * for 'wildignore' and don't put matches for 'suffixes' at the end. */
  rettv->v_type = VAR_STRING;
  if (argvars[1].v_type != VAR_UNKNOWN)
  {
    if (tv_get_number_chk(&argvars[1], &error))
      options |= WILD_KEEP_ALL;
    if (argvars[2].v_type != VAR_UNKNOWN)
    {
      if (tv_get_number_chk(&argvars[2], &error))
        rettv_list_set(rettv, NULL);
      if (argvars[3].v_type != VAR_UNKNOWN && tv_get_number_chk(&argvars[3], &error))
        options |= WILD_ALLLINKS;
    }
  }
  if (!error)
  {
    ExpandInit(&xpc);
    xpc.xp_context = EXPAND_FILES;
    if (p_wic)
      options += WILD_ICASE;
    if (rettv->v_type == VAR_STRING)
      rettv->vval.v_string = ExpandOne(&xpc, tv_get_string(&argvars[0]),
                                       NULL, options, WILD_ALL);
    else if (rettv_list_alloc(rettv) != FAIL)
    {
      int i;

      ExpandOne(&xpc, tv_get_string(&argvars[0]),
                NULL, options, WILD_ALL_KEEP);
      for (i = 0; i < xpc.xp_numfiles; i++)
        list_append_string(rettv->vval.v_list, xpc.xp_files[i], -1);

      ExpandCleanup(&xpc);
    }
  }
  else
    rettv->vval.v_string = NULL;
}

/*
 * "globpath()" function
 */
static void
f_globpath(typval_T *argvars, typval_T *rettv)
{
  int flags = 0;
  char_u buf1[NUMBUFLEN];
  char_u *file = tv_get_string_buf_chk(&argvars[1], buf1);
  int error = FALSE;
  garray_T ga;
  int i;

  /* When the optional second argument is non-zero, don't remove matches
    * for 'wildignore' and don't put matches for 'suffixes' at the end. */
  rettv->v_type = VAR_STRING;
  if (argvars[2].v_type != VAR_UNKNOWN)
  {
    if (tv_get_number_chk(&argvars[2], &error))
      flags |= WILD_KEEP_ALL;
    if (argvars[3].v_type != VAR_UNKNOWN)
    {
      if (tv_get_number_chk(&argvars[3], &error))
        rettv_list_set(rettv, NULL);
      if (argvars[4].v_type != VAR_UNKNOWN && tv_get_number_chk(&argvars[4], &error))
        flags |= WILD_ALLLINKS;
    }
  }
  if (file != NULL && !error)
  {
    ga_init2(&ga, (int)sizeof(char_u *), 10);
    globpath(tv_get_string(&argvars[0]), file, &ga, flags);
    if (rettv->v_type == VAR_STRING)
      rettv->vval.v_string = ga_concat_strings(&ga, "\n");
    else if (rettv_list_alloc(rettv) != FAIL)
      for (i = 0; i < ga.ga_len; ++i)
        list_append_string(rettv->vval.v_list,
                           ((char_u **)(ga.ga_data))[i], -1);
    ga_clear_strings(&ga);
  }
  else
    rettv->vval.v_string = NULL;
}

/*
 * "glob2regpat()" function
 */
static void
f_glob2regpat(typval_T *argvars, typval_T *rettv)
{
  char_u *pat = tv_get_string_chk(&argvars[0]);

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = (pat == NULL)
                             ? NULL
                             : file_pat_to_reg_pat(pat, NULL, NULL, FALSE);
}

/* for VIM_VERSION_ defines */
#include "version.h"

/*
 * "has()" function
 */
static void
f_has(typval_T *argvars, typval_T *rettv)
{
  int i;
  char_u *name;
  int n = FALSE;
  static char *(has_list[]) =
  {
#ifdef __BEOS__
    "beos",
#endif
#if defined(BSD) && !defined(MACOS_X)
    "bsd",
#endif
#ifdef hpux
    "hpux",
#endif
#ifdef __linux__
    "linux",
#endif
#ifdef MACOS_X
    "mac", /* Mac OS X (and, once, Mac OS Classic) */
    "osx", /* Mac OS X */
#ifdef MACOS_X_DARWIN
    "macunix",   /* Mac OS X, with the darwin feature */
    "osxdarwin", /* synonym for macunix */
#endif
#endif
#ifdef SUN_SYSTEM
    "sun",
#else
    "moon",
#endif
#ifdef UNIX
    "unix",
#endif
#ifdef VMS
    "vms",
#endif
#ifdef MSWIN
    "win32",
#endif
#if defined(UNIX) && defined(__CYGWIN__)
    "win32unix",
#endif
#ifdef _WIN64
    "win64",
#endif
#ifdef EBCDIC
    "ebcdic",
#endif
#ifndef CASE_INSENSITIVE_FILENAME
    "fname_case",
#endif
#ifdef HAVE_ACL
    "acl",
#endif
#ifdef FEAT_ARABIC
    "arabic",
#endif
    "autocmd",
#ifdef FEAT_AUTOCHDIR
    "autochdir",
#endif
#if defined(SOME_BUILTIN_TCAPS) || defined(ALL_BUILTIN_TCAPS)
    "builtin_terms",
#ifdef ALL_BUILTIN_TCAPS
    "all_builtin_terms",
#endif
#endif
#if defined(FEAT_BROWSE) && defined(USE_FILE_CHOOSER)
    "browsefilter",
#endif
#ifdef FEAT_BYTEOFF
    "byte_offset",
#endif
#ifdef FEAT_JOB_CHANNEL
    "channel",
#endif
#ifdef FEAT_CMDL_COMPL
    "cmdline_compl",
#endif
#ifdef FEAT_CMDHIST
    "cmdline_hist",
#endif
#ifdef FEAT_COMMENTS
    "comments",
#endif
    "cursorbind",
#ifdef DEBUG
    "debug",
#endif
#ifdef FEAT_DIFF
    "diff",
#endif
#ifdef FEAT_DIGRAPHS
    "digraphs",
#endif
#ifdef FEAT_DIRECTX
    "directx",
#endif
#ifdef FEAT_EMACS_TAGS
    "emacs_tags",
#endif
    "eval",     /* always present, of course! */
    "ex_extra", /* graduated feature */
#ifdef FEAT_SEARCH_EXTRA
    "extra_search",
#endif
#ifdef FEAT_SEARCHPATH
    "file_in_path",
#endif
#ifdef FEAT_FILTERPIPE
    "filterpipe",
#endif
#ifdef FEAT_FIND_ID
    "find_in_path",
#endif
#ifdef FEAT_FLOAT
    "float",
#endif
#ifdef FEAT_FOLDING
    "folding",
#endif
#ifdef FEAT_FOOTER
    "footer",
#endif
#if !defined(USE_SYSTEM) && defined(UNIX)
    "fork",
#endif
#ifdef FEAT_GETTEXT
    "gettext",
#endif
#if defined(HAVE_ICONV_H) && defined(USE_ICONV)
    "iconv",
#endif
#ifdef FEAT_JOB_CHANNEL
    "job",
#endif
#ifdef FEAT_JUMPLIST
    "jumplist",
#endif
#ifdef FEAT_KEYMAP
    "keymap",
#endif
    "lambda", /* always with FEAT_EVAL, since 7.4.2120 with closure */
#ifdef FEAT_LANGMAP
    "langmap",
#endif
#ifdef FEAT_LIBCALL
    "libcall",
#endif
    "libvim",
#ifdef FEAT_LINEBREAK
    "linebreak",
#endif
    "listcmds",
#ifdef FEAT_LOCALMAP
    "localmap",
#endif
#ifdef FEAT_LUA
#ifndef DYNAMIC_LUA
    "lua",
#endif
#endif
#ifdef FEAT_SESSION
    "mksession",
#endif
#ifdef FEAT_MODIFY_FNAME
    "modify_fname",
#endif
    "multi_byte",
#ifdef FEAT_MBYTE_IME
    "multi_byte_ime",
#endif
#ifdef FEAT_MULTI_LANG
    "multi_lang",
#endif
#ifdef FEAT_MZSCHEME
#ifndef DYNAMIC_MZSCHEME
    "mzscheme",
#endif
#endif
#ifdef FEAT_NUM64
    "num64",
#endif
#ifdef FEAT_OLE
    "ole",
#endif
    "oni",
    "oni2",
    "onivim",
    "onivim2",
#ifdef FEAT_EVAL
    "packages",
#endif
#ifdef FEAT_PATH_EXTRA
    "path_extra",
#endif
#ifdef FEAT_PERSISTENT_UNDO
    "persistent_undo",
#endif
#if defined(FEAT_PYTHON)
    "python_compiled",
#if defined(DYNAMIC_PYTHON)
    "python_dynamic",
#else
    "python",
    "pythonx",
#endif
#endif
#if defined(FEAT_PYTHON3)
    "python3_compiled",
#if defined(DYNAMIC_PYTHON3)
    "python3_dynamic",
#else
    "python3",
    "pythonx",
#endif
#endif
#ifdef FEAT_POSTSCRIPT
    "postscript",
#endif
#ifdef FEAT_PROFILE
    "profile",
#endif
#ifdef FEAT_RELTIME
    "reltime",
#endif
#ifdef FEAT_QUICKFIX
    "quickfix",
#endif
#ifdef FEAT_RIGHTLEFT
    "rightleft",
#endif
    "scrollbind",
#ifdef FEAT_SIGNS
    "signs",
#endif
#ifdef FEAT_SMARTINDENT
    "smartindent",
#endif
#ifdef STARTUPTIME
    "startuptime",
#endif
#if defined(USE_SYSTEM) || !defined(UNIX)
    "system",
#endif
#ifdef FEAT_TAG_BINS
    "tag_binary",
#endif
#if defined(FEAT_TERMINAL) && !defined(MSWIN)
    "terminal",
#endif
#ifdef TERMINFO
    "terminfo",
#endif
#ifdef FEAT_TEXTOBJ
    "textobjects",
#endif
#ifdef HAVE_TGETENT
    "tgetent",
#endif
#ifdef FEAT_TIMERS
    "timers",
#endif
#ifdef FEAT_TOOLBAR
    "toolbar",
#endif
    "user-commands", /* was accidentally included in 5.4 */
    "user_commands",
#ifdef FEAT_VARTABS
    "vartabs",
#endif
    "vertsplit",
#ifdef FEAT_VIMINFO
    "viminfo",
#endif
    "vimscript-1",
    "vimscript-2",
    "vimscript-3",
    "virtualedit",
    "visual",
    "visualextra",
    "vreplace",
#ifdef FEAT_WILDIGN
    "wildignore",
#endif
#ifdef FEAT_WILDMENU
    "wildmenu",
#endif
    "windows",
#ifdef FEAT_WAK
    "winaltkeys",
#endif
#ifdef FEAT_WRITEBACKUP
    "writebackup",
#endif
#ifdef FEAT_XFONTSET
    "xfontset",
#endif
#ifdef USE_XSMP
    "xsmp",
#endif
#ifdef USE_XSMP_INTERACT
    "xsmp_interact",
#endif
#ifdef FEAT_XCLIPBOARD
    "xterm_clipboard",
#endif
#ifdef FEAT_XTERM_SAVE
    "xterm_save",
#endif
#if defined(UNIX) && defined(FEAT_X11)
    "X11",
#endif
    NULL
  };

  name = tv_get_string(&argvars[0]);
  for (i = 0; has_list[i] != NULL; ++i)
    if (STRICMP(name, has_list[i]) == 0)
    {
      n = TRUE;
      break;
    }

  if (n == FALSE)
  {
    if (STRNICMP(name, "patch", 5) == 0)
    {
      if (name[5] == '-' && STRLEN(name) >= 11 && vim_isdigit(name[6]) && vim_isdigit(name[8]) && vim_isdigit(name[10]))
      {
        int major = atoi((char *)name + 6);
        int minor = atoi((char *)name + 8);

        /* Expect "patch-9.9.01234". */
        n = (major < VIM_VERSION_MAJOR || (major == VIM_VERSION_MAJOR && (minor < VIM_VERSION_MINOR || (minor == VIM_VERSION_MINOR && has_patch(atoi((char *)name + 10))))));
      }
      else
        n = has_patch(atoi((char *)name + 5));
    }
    else if (STRICMP(name, "vim_starting") == 0)
      n = (starting != 0);
    else if (STRICMP(name, "ttyin") == 0)
      n = mch_input_isatty();
    else if (STRICMP(name, "ttyout") == 0)
      n = stdout_isatty;
    else if (STRICMP(name, "multi_byte_encoding") == 0)
      n = has_mbyte;
#ifdef DYNAMIC_TCL
    else if (STRICMP(name, "tcl") == 0)
      n = tcl_enabled(FALSE);
#endif
#if defined(USE_ICONV) && defined(DYNAMIC_ICONV)
    else if (STRICMP(name, "iconv") == 0)
      n = iconv_enabled(FALSE);
#endif
#ifdef DYNAMIC_LUA
    else if (STRICMP(name, "lua") == 0)
      n = lua_enabled(FALSE);
#endif
#ifdef DYNAMIC_MZSCHEME
    else if (STRICMP(name, "mzscheme") == 0)
      n = mzscheme_enabled(FALSE);
#endif
#ifdef DYNAMIC_RUBY
    else if (STRICMP(name, "ruby") == 0)
      n = ruby_enabled(FALSE);
#endif
#ifdef DYNAMIC_PYTHON
    else if (STRICMP(name, "python") == 0)
      n = python_enabled(FALSE);
#endif
#ifdef DYNAMIC_PYTHON3
    else if (STRICMP(name, "python3") == 0)
      n = python3_enabled(FALSE);
#endif
#if defined(DYNAMIC_PYTHON) || defined(DYNAMIC_PYTHON3)
    else if (STRICMP(name, "pythonx") == 0)
    {
#if defined(DYNAMIC_PYTHON) && defined(DYNAMIC_PYTHON3)
      if (p_pyx == 0)
        n = python3_enabled(FALSE) || python_enabled(FALSE);
      else if (p_pyx == 3)
        n = python3_enabled(FALSE);
      else if (p_pyx == 2)
        n = python_enabled(FALSE);
#elif defined(DYNAMIC_PYTHON)
      n = python_enabled(FALSE);
#elif defined(DYNAMIC_PYTHON3)
      n = python3_enabled(FALSE);
#endif
    }
#endif
#ifdef DYNAMIC_PERL
    else if (STRICMP(name, "perl") == 0)
      n = perl_enabled(FALSE);
#endif
#if defined(FEAT_TERMINAL) && defined(MSWIN)
    else if (STRICMP(name, "terminal") == 0)
      n = terminal_enabled();
#endif
#if defined(FEAT_TERMINAL) && defined(MSWIN)
    else if (STRICMP(name, "conpty") == 0)
      n = use_conpty();
#endif
  }

  rettv->vval.v_number = n;
}

/*
 * "has_key()" function
 */
static void
f_has_key(typval_T *argvars, typval_T *rettv)
{
  if (argvars[0].v_type != VAR_DICT)
  {
    emsg(_(e_dictreq));
    return;
  }
  if (argvars[0].vval.v_dict == NULL)
    return;

  rettv->vval.v_number = dict_find(argvars[0].vval.v_dict,
                                   tv_get_string(&argvars[1]), -1) != NULL;
}

/*
 * "haslocaldir()" function
 */
static void
f_haslocaldir(typval_T *argvars, typval_T *rettv)
{
  tabpage_T *tp = NULL;
  win_T *wp = NULL;

  wp = find_tabwin(&argvars[0], &argvars[1], &tp);

  // Check for window-local and tab-local directories
  if (wp != NULL && wp->w_localdir != NULL)
    rettv->vval.v_number = 1;
  else if (tp != NULL && tp->tp_localdir != NULL)
    rettv->vval.v_number = 2;
  else
    rettv->vval.v_number = 0;
}

/*
 * "hasmapto()" function
 */
static void
f_hasmapto(typval_T *argvars, typval_T *rettv)
{
  char_u *name;
  char_u *mode;
  char_u buf[NUMBUFLEN];
  int abbr = FALSE;

  name = tv_get_string(&argvars[0]);
  if (argvars[1].v_type == VAR_UNKNOWN)
    mode = (char_u *)"nvo";
  else
  {
    mode = tv_get_string_buf(&argvars[1], buf);
    if (argvars[2].v_type != VAR_UNKNOWN)
      abbr = (int)tv_get_number(&argvars[2]);
  }

  if (map_to_exists(name, mode, abbr))
    rettv->vval.v_number = TRUE;
  else
    rettv->vval.v_number = FALSE;
}

/*
 * "histadd()" function
 */
static void
f_histadd(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_CMDHIST
  int histype;
  char_u *str;
  char_u buf[NUMBUFLEN];
#endif

  rettv->vval.v_number = FALSE;
  if (check_secure())
    return;
#ifdef FEAT_CMDHIST
  str = tv_get_string_chk(&argvars[0]); /* NULL on type error */
  histype = str != NULL ? get_histtype(str) : -1;
  if (histype >= 0)
  {
    str = tv_get_string_buf(&argvars[1], buf);
    if (*str != NUL)
    {
      init_history();
      add_to_history(histype, str, FALSE, NUL);
      rettv->vval.v_number = TRUE;
      return;
    }
  }
#endif
}

/*
 * "histdel()" function
 */
static void
f_histdel(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_CMDHIST
  int n;
  char_u buf[NUMBUFLEN];
  char_u *str;

  str = tv_get_string_chk(&argvars[0]); /* NULL on type error */
  if (str == NULL)
    n = 0;
  else if (argvars[1].v_type == VAR_UNKNOWN)
    /* only one argument: clear entire history */
    n = clr_history(get_histtype(str));
  else if (argvars[1].v_type == VAR_NUMBER)
    /* index given: remove that entry */
    n = del_history_idx(get_histtype(str),
                        (int)tv_get_number(&argvars[1]));
  else
    /* string given: remove all matching entries */
    n = del_history_entry(get_histtype(str),
                          tv_get_string_buf(&argvars[1], buf));
  rettv->vval.v_number = n;
#endif
}

/*
 * "histget()" function
 */
static void
f_histget(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_CMDHIST
  int type;
  int idx;
  char_u *str;

  str = tv_get_string_chk(&argvars[0]); /* NULL on type error */
  if (str == NULL)
    rettv->vval.v_string = NULL;
  else
  {
    type = get_histtype(str);
    if (argvars[1].v_type == VAR_UNKNOWN)
      idx = get_history_idx(type);
    else
      idx = (int)tv_get_number_chk(&argvars[1], NULL);
    /* -1 on type error */
    rettv->vval.v_string = vim_strsave(get_history_entry(type, idx));
  }
#else
  rettv->vval.v_string = NULL;
#endif
  rettv->v_type = VAR_STRING;
}

/*
 * "histnr()" function
 */
static void
f_histnr(typval_T *argvars UNUSED, typval_T *rettv)
{
  int i;

#ifdef FEAT_CMDHIST
  char_u *history = tv_get_string_chk(&argvars[0]);

  i = history == NULL ? HIST_CMD - 1 : get_histtype(history);
  if (i >= HIST_CMD && i < HIST_COUNT)
    i = get_history_idx(i);
  else
#endif
    i = -1;
  rettv->vval.v_number = i;
}

/*
 * "highlightID(name)" function
 */
static void
f_hlID(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = syn_name2id(tv_get_string(&argvars[0]));
}

/*
 * "highlight_exists()" function
 */
static void
f_hlexists(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = highlight_exists(tv_get_string(&argvars[0]));
}

/*
 * "hostname()" function
 */
static void
f_hostname(typval_T *argvars UNUSED, typval_T *rettv)
{
  char_u hostname[256];

  mch_get_host_name(hostname, 256);
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = vim_strsave(hostname);
}

/*
 * iconv() function
 */
static void
f_iconv(typval_T *argvars UNUSED, typval_T *rettv)
{
  char_u buf1[NUMBUFLEN];
  char_u buf2[NUMBUFLEN];
  char_u *from, *to, *str;
  vimconv_T vimconv;

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;

  str = tv_get_string(&argvars[0]);
  from = enc_canonize(enc_skip(tv_get_string_buf(&argvars[1], buf1)));
  to = enc_canonize(enc_skip(tv_get_string_buf(&argvars[2], buf2)));
  vimconv.vc_type = CONV_NONE;
  convert_setup(&vimconv, from, to);

  /* If the encodings are equal, no conversion needed. */
  if (vimconv.vc_type == CONV_NONE)
    rettv->vval.v_string = vim_strsave(str);
  else
    rettv->vval.v_string = string_convert(&vimconv, str, NULL);

  convert_setup(&vimconv, NULL, NULL);
  vim_free(from);
  vim_free(to);
}

/*
 * "indent()" function
 */
static void
f_indent(typval_T *argvars, typval_T *rettv)
{
  linenr_T lnum;

  lnum = tv_get_lnum(argvars);
  if (lnum >= 1 && lnum <= curbuf->b_ml.ml_line_count)
    rettv->vval.v_number = get_indent_lnum(lnum);
  else
    rettv->vval.v_number = -1;
}

/*
 * "index()" function
 */
static void
f_index(typval_T *argvars, typval_T *rettv)
{
  list_T *l;
  listitem_T *item;
  blob_T *b;
  long idx = 0;
  int ic = FALSE;
  int error = FALSE;

  rettv->vval.v_number = -1;
  if (argvars[0].v_type == VAR_BLOB)
  {
    typval_T tv;
    int start = 0;

    if (argvars[2].v_type != VAR_UNKNOWN)
    {
      start = tv_get_number_chk(&argvars[2], &error);
      if (error)
        return;
    }
    b = argvars[0].vval.v_blob;
    if (b == NULL)
      return;
    if (start < 0)
    {
      start = blob_len(b) + start;
      if (start < 0)
        start = 0;
    }

    for (idx = start; idx < blob_len(b); ++idx)
    {
      tv.v_type = VAR_NUMBER;
      tv.vval.v_number = blob_get(b, idx);
      if (tv_equal(&tv, &argvars[1], ic, FALSE))
      {
        rettv->vval.v_number = idx;
        return;
      }
    }
    return;
  }
  else if (argvars[0].v_type != VAR_LIST)
  {
    emsg(_(e_listblobreq));
    return;
  }

  l = argvars[0].vval.v_list;
  if (l != NULL)
  {
    item = l->lv_first;
    if (argvars[2].v_type != VAR_UNKNOWN)
    {
      /* Start at specified item.  Use the cached index that list_find()
	     * sets, so that a negative number also works. */
      item = list_find(l, (long)tv_get_number_chk(&argvars[2], &error));
      idx = l->lv_idx;
      if (argvars[3].v_type != VAR_UNKNOWN)
        ic = (int)tv_get_number_chk(&argvars[3], &error);
      if (error)
        item = NULL;
    }

    for (; item != NULL; item = item->li_next, ++idx)
      if (tv_equal(&item->li_tv, &argvars[1], ic, FALSE))
      {
        rettv->vval.v_number = idx;
        break;
      }
  }
}

static int inputsecret_flag = 0;

/*
 * "input()" function
 *     Also handles inputsecret() when inputsecret is set.
 */
static void
f_input(typval_T *argvars, typval_T *rettv)
{
  get_user_input(argvars, rettv, FALSE, inputsecret_flag);
}

/*
 * "inputdialog()" function
 */
static void
f_inputdialog(typval_T *argvars, typval_T *rettv)
{
  get_user_input(argvars, rettv, TRUE, inputsecret_flag);
}

/*
 * "inputlist()" function
 */
static void
f_inputlist(typval_T *argvars, typval_T *rettv)
{
  listitem_T *li;
  int selected;
  int mouse_used;

#ifdef NO_CONSOLE_INPUT
  /* While starting up, there is no place to enter text. When running tests
     * with --not-a-term we assume feedkeys() will be used. */
  if (no_console_input() && !is_not_a_term())
    return;
#endif
  if (argvars[0].v_type != VAR_LIST || argvars[0].vval.v_list == NULL)
  {
    semsg(_(e_listarg), "inputlist()");
    return;
  }

  msg_start();
  msg_row = Rows - 1; /* for when 'cmdheight' > 1 */
  lines_left = Rows;  /* avoid more prompt */
  msg_scroll = TRUE;
  msg_clr_eos();

  for (li = argvars[0].vval.v_list->lv_first; li != NULL; li = li->li_next)
  {
    msg_puts((char *)tv_get_string(&li->li_tv));
    msg_putchar('\n');
  }

  /* Ask for choice. */
  selected = prompt_for_number(&mouse_used);
  if (mouse_used)
    selected -= lines_left;

  rettv->vval.v_number = selected;
}

static garray_T ga_userinput = {0, 0, sizeof(tasave_T), 4, NULL};

/*
 * "inputrestore()" function
 */
static void
f_inputrestore(typval_T *argvars UNUSED, typval_T *rettv)
{
  if (ga_userinput.ga_len > 0)
  {
    --ga_userinput.ga_len;
    restore_typeahead((tasave_T *)(ga_userinput.ga_data) + ga_userinput.ga_len);
    /* default return is zero == OK */
  }
  else if (p_verbose > 1)
  {
    verb_msg(_("called inputrestore() more often than inputsave()"));
    rettv->vval.v_number = 1; /* Failed */
  }
}

/*
 * "inputsave()" function
 */
static void
f_inputsave(typval_T *argvars UNUSED, typval_T *rettv)
{
  /* Add an entry to the stack of typeahead storage. */
  if (ga_grow(&ga_userinput, 1) == OK)
  {
    save_typeahead((tasave_T *)(ga_userinput.ga_data) + ga_userinput.ga_len);
    ++ga_userinput.ga_len;
    /* default return is zero == OK */
  }
  else
    rettv->vval.v_number = 1; /* Failed */
}

/*
 * "inputsecret()" function
 */
static void
f_inputsecret(typval_T *argvars, typval_T *rettv)
{
  ++cmdline_star;
  ++inputsecret_flag;
  f_input(argvars, rettv);
  --cmdline_star;
  --inputsecret_flag;
}

/*
 * "insert()" function
 */
static void
f_insert(typval_T *argvars, typval_T *rettv)
{
  long before = 0;
  listitem_T *item;
  list_T *l;
  int error = FALSE;

  if (argvars[0].v_type == VAR_BLOB)
  {
    int val, len;
    char_u *p;

    len = blob_len(argvars[0].vval.v_blob);
    if (argvars[2].v_type != VAR_UNKNOWN)
    {
      before = (long)tv_get_number_chk(&argvars[2], &error);
      if (error)
        return; // type error; errmsg already given
      if (before < 0 || before > len)
      {
        semsg(_(e_invarg2), tv_get_string(&argvars[2]));
        return;
      }
    }
    val = tv_get_number_chk(&argvars[1], &error);
    if (error)
      return;
    if (val < 0 || val > 255)
    {
      semsg(_(e_invarg2), tv_get_string(&argvars[1]));
      return;
    }

    if (ga_grow(&argvars[0].vval.v_blob->bv_ga, 1) == FAIL)
      return;
    p = (char_u *)argvars[0].vval.v_blob->bv_ga.ga_data;
    mch_memmove(p + before + 1, p + before, (size_t)len - before);
    *(p + before) = val;
    ++argvars[0].vval.v_blob->bv_ga.ga_len;

    copy_tv(&argvars[0], rettv);
  }
  else if (argvars[0].v_type != VAR_LIST)
    semsg(_(e_listblobarg), "insert()");
  else if ((l = argvars[0].vval.v_list) != NULL && !var_check_lock(l->lv_lock,
                                                                   (char_u *)N_("insert() argument"), TRUE))
  {
    if (argvars[2].v_type != VAR_UNKNOWN)
      before = (long)tv_get_number_chk(&argvars[2], &error);
    if (error)
      return; /* type error; errmsg already given */

    if (before == l->lv_len)
      item = NULL;
    else
    {
      item = list_find(l, before);
      if (item == NULL)
      {
        semsg(_(e_listidx), before);
        l = NULL;
      }
    }
    if (l != NULL)
    {
      list_insert_tv(l, &argvars[1], item);
      copy_tv(&argvars[0], rettv);
    }
  }
}

/*
 * "invert(expr)" function
 */
static void
f_invert(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = ~tv_get_number_chk(&argvars[0], NULL);
}

/*
 * "isdirectory()" function
 */
static void
f_isdirectory(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = mch_isdir(tv_get_string(&argvars[0]));
}

/*
 * Return TRUE if typeval "tv" is locked: Either that value is locked itself
 * or it refers to a List or Dictionary that is locked.
 */
static int
tv_islocked(typval_T *tv)
{
  return (tv->v_lock & VAR_LOCKED) || (tv->v_type == VAR_LIST && tv->vval.v_list != NULL && (tv->vval.v_list->lv_lock & VAR_LOCKED)) || (tv->v_type == VAR_DICT && tv->vval.v_dict != NULL && (tv->vval.v_dict->dv_lock & VAR_LOCKED));
}

/*
 * "islocked()" function
 */
static void
f_islocked(typval_T *argvars, typval_T *rettv)
{
  lval_T lv;
  char_u *end;
  dictitem_T *di;

  rettv->vval.v_number = -1;
  end = get_lval(tv_get_string(&argvars[0]), NULL, &lv, FALSE, FALSE,
                 GLV_NO_AUTOLOAD | GLV_READ_ONLY, FNE_CHECK_START);
  if (end != NULL && lv.ll_name != NULL)
  {
    if (*end != NUL)
      emsg(_(e_trailing));
    else
    {
      if (lv.ll_tv == NULL)
      {
        di = find_var(lv.ll_name, NULL, TRUE);
        if (di != NULL)
        {
          /* Consider a variable locked when:
		     * 1. the variable itself is locked
		     * 2. the value of the variable is locked.
		     * 3. the List or Dict value is locked.
		     */
          rettv->vval.v_number = ((di->di_flags & DI_FLAGS_LOCK) || tv_islocked(&di->di_tv));
        }
      }
      else if (lv.ll_range)
        emsg(_("E786: Range not allowed"));
      else if (lv.ll_newkey != NULL)
        semsg(_(e_dictkey), lv.ll_newkey);
      else if (lv.ll_list != NULL)
        /* List item. */
        rettv->vval.v_number = tv_islocked(&lv.ll_li->li_tv);
      else
        /* Dictionary item. */
        rettv->vval.v_number = tv_islocked(&lv.ll_di->di_tv);
    }
  }

  clear_lval(&lv);
}

#if defined(FEAT_FLOAT) && defined(HAVE_MATH_H)
/*
 * "isinf()" function
 */
static void
f_isinf(typval_T *argvars, typval_T *rettv)
{
  if (argvars[0].v_type == VAR_FLOAT && isinf(argvars[0].vval.v_float))
    rettv->vval.v_number = argvars[0].vval.v_float > 0.0 ? 1 : -1;
}

/*
 * "isnan()" function
 */
static void
f_isnan(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = argvars[0].v_type == VAR_FLOAT && isnan(argvars[0].vval.v_float);
}
#endif

/*
 * "items(dict)" function
 */
static void
f_items(typval_T *argvars, typval_T *rettv)
{
  dict_list(argvars, rettv, 2);
}

#if defined(FEAT_JOB_CHANNEL) || defined(PROTO)
/*
 * Get the job from the argument.
 * Returns NULL if the job is invalid.
 */
static job_T *
get_job_arg(typval_T *tv)
{
  job_T *job;

  if (tv->v_type != VAR_JOB)
  {
    semsg(_(e_invarg2), tv_get_string(tv));
    return NULL;
  }
  job = tv->vval.v_job;

  if (job == NULL)
    emsg(_("E916: not a valid job"));
  return job;
}

/*
 * "job_getchannel()" function
 */
static void
f_job_getchannel(typval_T *argvars, typval_T *rettv)
{
  job_T *job = get_job_arg(&argvars[0]);

  if (job != NULL)
  {
    rettv->v_type = VAR_CHANNEL;
    rettv->vval.v_channel = job->jv_channel;
    if (job->jv_channel != NULL)
      ++job->jv_channel->ch_refcount;
  }
}

/*
 * "job_info()" function
 */
static void
f_job_info(typval_T *argvars, typval_T *rettv)
{
  if (argvars[0].v_type != VAR_UNKNOWN)
  {
    job_T *job = get_job_arg(&argvars[0]);

    if (job != NULL && rettv_dict_alloc(rettv) != FAIL)
      job_info(job, rettv->vval.v_dict);
  }
  else if (rettv_list_alloc(rettv) == OK)
    job_info_all(rettv->vval.v_list);
}

/*
 * "job_setoptions()" function
 */
static void
f_job_setoptions(typval_T *argvars, typval_T *rettv UNUSED)
{
  job_T *job = get_job_arg(&argvars[0]);
  jobopt_T opt;

  if (job == NULL)
    return;
  clear_job_options(&opt);
  if (get_job_options(&argvars[1], &opt, JO_STOPONEXIT + JO_EXIT_CB, 0) == OK)
    job_set_options(job, &opt);
  free_job_options(&opt);
}

/*
 * "job_start()" function
 */
static void
f_job_start(typval_T *argvars, typval_T *rettv)
{
  rettv->v_type = VAR_JOB;
  if (check_restricted() || check_secure())
    return;
  rettv->vval.v_job = job_start(argvars, NULL, NULL, FALSE);
}

/*
 * "job_status()" function
 */
static void
f_job_status(typval_T *argvars, typval_T *rettv)
{
  job_T *job = get_job_arg(&argvars[0]);

  if (job != NULL)
  {
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = vim_strsave((char_u *)job_status(job));
  }
}

/*
 * "job_stop()" function
 */
static void
f_job_stop(typval_T *argvars, typval_T *rettv)
{
  job_T *job = get_job_arg(&argvars[0]);

  if (job != NULL)
    rettv->vval.v_number = job_stop(job, argvars, NULL);
}
#endif

/*
 * "join()" function
 */
static void
f_join(typval_T *argvars, typval_T *rettv)
{
  garray_T ga;
  char_u *sep;

  if (argvars[0].v_type != VAR_LIST)
  {
    emsg(_(e_listreq));
    return;
  }
  if (argvars[0].vval.v_list == NULL)
    return;
  if (argvars[1].v_type == VAR_UNKNOWN)
    sep = (char_u *)" ";
  else
    sep = tv_get_string_chk(&argvars[1]);

  rettv->v_type = VAR_STRING;

  if (sep != NULL)
  {
    ga_init2(&ga, (int)sizeof(char), 80);
    list_join(&ga, argvars[0].vval.v_list, sep, TRUE, FALSE, 0);
    ga_append(&ga, NUL);
    rettv->vval.v_string = (char_u *)ga.ga_data;
  }
  else
    rettv->vval.v_string = NULL;
}

/*
 * "js_decode()" function
 */
static void
f_js_decode(typval_T *argvars, typval_T *rettv)
{
  js_read_T reader;

  reader.js_buf = tv_get_string(&argvars[0]);
  reader.js_fill = NULL;
  reader.js_used = 0;
  if (json_decode_all(&reader, rettv, JSON_JS) != OK)
    emsg(_(e_invarg));
}

/*
 * "js_encode()" function
 */
static void
f_js_encode(typval_T *argvars, typval_T *rettv)
{
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = json_encode(&argvars[0], JSON_JS);
}

/*
 * "json_decode()" function
 */
static void
f_json_decode(typval_T *argvars, typval_T *rettv)
{
  js_read_T reader;

  reader.js_buf = tv_get_string(&argvars[0]);
  reader.js_fill = NULL;
  reader.js_used = 0;
  json_decode_all(&reader, rettv, 0);
}

/*
 * "json_encode()" function
 */
static void
f_json_encode(typval_T *argvars, typval_T *rettv)
{
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = json_encode(&argvars[0], 0);
}

/*
 * "keys()" function
 */
static void
f_keys(typval_T *argvars, typval_T *rettv)
{
  dict_list(argvars, rettv, 0);
}

/*
 * "last_buffer_nr()" function.
 */
static void
f_last_buffer_nr(typval_T *argvars UNUSED, typval_T *rettv)
{
  int n = 0;
  buf_T *buf;

  FOR_ALL_BUFFERS(buf)
  if (n < buf->b_fnum)
    n = buf->b_fnum;

  rettv->vval.v_number = n;
}

/*
 * "len()" function
 */
static void
f_len(typval_T *argvars, typval_T *rettv)
{
  switch (argvars[0].v_type)
  {
  case VAR_STRING:
  case VAR_NUMBER:
    rettv->vval.v_number = (varnumber_T)STRLEN(
        tv_get_string(&argvars[0]));
    break;
  case VAR_BLOB:
    rettv->vval.v_number = blob_len(argvars[0].vval.v_blob);
    break;
  case VAR_LIST:
    rettv->vval.v_number = list_len(argvars[0].vval.v_list);
    break;
  case VAR_DICT:
    rettv->vval.v_number = dict_len(argvars[0].vval.v_dict);
    break;
  case VAR_UNKNOWN:
  case VAR_SPECIAL:
  case VAR_FLOAT:
  case VAR_FUNC:
  case VAR_PARTIAL:
  case VAR_JOB:
  case VAR_CHANNEL:
    emsg(_("E701: Invalid type for len()"));
    break;
  }
}

static void
libcall_common(typval_T *argvars UNUSED, typval_T *rettv, int type)
{
#ifdef FEAT_LIBCALL
  char_u *string_in;
  char_u **string_result;
  int nr_result;
#endif

  rettv->v_type = type;
  if (type != VAR_NUMBER)
    rettv->vval.v_string = NULL;

  if (check_restricted() || check_secure())
    return;

#ifdef FEAT_LIBCALL
  /* The first two args must be strings, otherwise it's meaningless */
  if (argvars[0].v_type == VAR_STRING && argvars[1].v_type == VAR_STRING)
  {
    string_in = NULL;
    if (argvars[2].v_type == VAR_STRING)
      string_in = argvars[2].vval.v_string;
    if (type == VAR_NUMBER)
      string_result = NULL;
    else
      string_result = &rettv->vval.v_string;
    if (mch_libcall(argvars[0].vval.v_string,
                    argvars[1].vval.v_string,
                    string_in,
                    argvars[2].vval.v_number,
                    string_result,
                    &nr_result) == OK &&
        type == VAR_NUMBER)
      rettv->vval.v_number = nr_result;
  }
#endif
}

/*
 * "libcall()" function
 */
static void
f_libcall(typval_T *argvars, typval_T *rettv)
{
  libcall_common(argvars, rettv, VAR_STRING);
}

/*
 * "libcallnr()" function
 */
static void
f_libcallnr(typval_T *argvars, typval_T *rettv)
{
  libcall_common(argvars, rettv, VAR_NUMBER);
}

/*
 * "line(string)" function
 */
static void
f_line(typval_T *argvars, typval_T *rettv)
{
  linenr_T lnum = 0;
  pos_T *fp;
  int fnum;

  fp = var2fpos(&argvars[0], TRUE, &fnum);
  if (fp != NULL)
    lnum = fp->lnum;
  rettv->vval.v_number = lnum;
}

/*
 * "line2byte(lnum)" function
 */
static void
f_line2byte(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifndef FEAT_BYTEOFF
  rettv->vval.v_number = -1;
#else
  linenr_T lnum;

  lnum = tv_get_lnum(argvars);
  if (lnum < 1 || lnum > curbuf->b_ml.ml_line_count + 1)
    rettv->vval.v_number = -1;
  else
    rettv->vval.v_number = ml_find_line_or_offset(curbuf, lnum, NULL);
  if (rettv->vval.v_number >= 0)
    ++rettv->vval.v_number;
#endif
}

/*
 * "lispindent(lnum)" function
 */
static void
f_lispindent(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->vval.v_number = -1;
}

/*
 * "list2str()" function
 */
static void
f_list2str(typval_T *argvars, typval_T *rettv)
{
  list_T *l;
  listitem_T *li;
  garray_T ga;
  int utf8 = FALSE;

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;
  if (argvars[0].v_type != VAR_LIST)
  {
    emsg(_(e_invarg));
    return;
  }

  l = argvars[0].vval.v_list;
  if (l == NULL)
    return; // empty list results in empty string

  if (argvars[1].v_type != VAR_UNKNOWN)
    utf8 = (int)tv_get_number_chk(&argvars[1], NULL);

  ga_init2(&ga, 1, 80);
  if (has_mbyte || utf8)
  {
    char_u buf[MB_MAXBYTES + 1];
    int (*char2bytes)(int, char_u *);

    if (utf8 || enc_utf8)
      char2bytes = utf_char2bytes;
    else
      char2bytes = mb_char2bytes;

    for (li = l->lv_first; li != NULL; li = li->li_next)
    {
      buf[(*char2bytes)(tv_get_number(&li->li_tv), buf)] = NUL;
      ga_concat(&ga, buf);
    }
    ga_append(&ga, NUL);
  }
  else if (ga_grow(&ga, list_len(l) + 1) == OK)
  {
    for (li = l->lv_first; li != NULL; li = li->li_next)
      ga_append(&ga, tv_get_number(&li->li_tv));
    ga_append(&ga, NUL);
  }

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = ga.ga_data;
}

/*
 * "localtime()" function
 */
static void
f_localtime(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->vval.v_number = (varnumber_T)time(NULL);
}

static void
get_maparg(typval_T *argvars, typval_T *rettv, int exact)
{
  char_u *keys;
  char_u *which;
  char_u buf[NUMBUFLEN];
  char_u *keys_buf = NULL;
  char_u *rhs;
  int mode;
  int abbr = FALSE;
  int get_dict = FALSE;
  mapblock_T *mp;
  int buffer_local;

  /* return empty string for failure */
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;

  keys = tv_get_string(&argvars[0]);
  if (*keys == NUL)
    return;

  if (argvars[1].v_type != VAR_UNKNOWN)
  {
    which = tv_get_string_buf_chk(&argvars[1], buf);
    if (argvars[2].v_type != VAR_UNKNOWN)
    {
      abbr = (int)tv_get_number(&argvars[2]);
      if (argvars[3].v_type != VAR_UNKNOWN)
        get_dict = (int)tv_get_number(&argvars[3]);
    }
  }
  else
    which = (char_u *)"";
  if (which == NULL)
    return;

  mode = get_map_mode(&which, 0);

  keys = replace_termcodes(keys, &keys_buf, TRUE, TRUE, FALSE);
  rhs = check_map(keys, mode, exact, FALSE, abbr, &mp, &buffer_local);
  vim_free(keys_buf);

  if (!get_dict)
  {
    /* Return a string. */
    if (rhs != NULL)
    {
      if (*rhs == NUL)
        rettv->vval.v_string = vim_strsave((char_u *)"<Nop>");
      else
        rettv->vval.v_string = str2special_save(rhs, FALSE);
    }
  }
  else if (rettv_dict_alloc(rettv) != FAIL && rhs != NULL)
  {
    /* Return a dictionary. */
    char_u *lhs = str2special_save(mp->m_keys, TRUE);
    char_u *mapmode = map_mode_to_chars(mp->m_mode);
    dict_T *dict = rettv->vval.v_dict;

    dict_add_string(dict, "lhs", lhs);
    dict_add_string(dict, "rhs", mp->m_orig_str);
    dict_add_number(dict, "noremap", mp->m_noremap ? 1L : 0L);
    dict_add_number(dict, "expr", mp->m_expr ? 1L : 0L);
    dict_add_number(dict, "silent", mp->m_silent ? 1L : 0L);
    dict_add_number(dict, "sid", (long)mp->m_script_ctx.sc_sid);
    dict_add_number(dict, "lnum", (long)mp->m_script_ctx.sc_lnum);
    dict_add_number(dict, "buffer", (long)buffer_local);
    dict_add_number(dict, "nowait", mp->m_nowait ? 1L : 0L);
    dict_add_string(dict, "mode", mapmode);

    vim_free(lhs);
    vim_free(mapmode);
  }
}

#ifdef FEAT_FLOAT
/*
 * "log()" function
 */
static void
f_log(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    rettv->vval.v_float = log(f);
  else
    rettv->vval.v_float = 0.0;
}

/*
 * "log10()" function
 */
static void
f_log10(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    rettv->vval.v_float = log10(f);
  else
    rettv->vval.v_float = 0.0;
}
#endif

#ifdef FEAT_LUA
/*
 * "luaeval()" function
 */
static void
f_luaeval(typval_T *argvars, typval_T *rettv)
{
  char_u *str;
  char_u buf[NUMBUFLEN];

  if (check_restricted() || check_secure())
    return;

  str = tv_get_string_buf(&argvars[0], buf);
  do_luaeval(str, argvars + 1, rettv);
}
#endif

/*
 * "map()" function
 */
static void
f_map(typval_T *argvars, typval_T *rettv)
{
  filter_map(argvars, rettv, TRUE);
}

/*
 * "maparg()" function
 */
static void
f_maparg(typval_T *argvars, typval_T *rettv)
{
  get_maparg(argvars, rettv, TRUE);
}

/*
 * "mapcheck()" function
 */
static void
f_mapcheck(typval_T *argvars, typval_T *rettv)
{
  get_maparg(argvars, rettv, FALSE);
}

typedef enum
{
  MATCH_END,   /* matchend() */
  MATCH_MATCH, /* match() */
  MATCH_STR,   /* matchstr() */
  MATCH_LIST,  /* matchlist() */
  MATCH_POS    /* matchstrpos() */
} matchtype_T;

static void
find_some_match(typval_T *argvars, typval_T *rettv, matchtype_T type)
{
  char_u *str = NULL;
  long len = 0;
  char_u *expr = NULL;
  char_u *pat;
  regmatch_T regmatch;
  char_u patbuf[NUMBUFLEN];
  char_u strbuf[NUMBUFLEN];
  char_u *save_cpo;
  long start = 0;
  long nth = 1;
  colnr_T startcol = 0;
  int match = 0;
  list_T *l = NULL;
  listitem_T *li = NULL;
  long idx = 0;
  char_u *tofree = NULL;

  /* Make 'cpoptions' empty, the 'l' flag should not be used here. */
  save_cpo = p_cpo;
  p_cpo = (char_u *)"";

  rettv->vval.v_number = -1;
  if (type == MATCH_LIST || type == MATCH_POS)
  {
    /* type MATCH_LIST: return empty list when there are no matches.
	 * type MATCH_POS: return ["", -1, -1, -1] */
    if (rettv_list_alloc(rettv) == FAIL)
      goto theend;
    if (type == MATCH_POS && (list_append_string(rettv->vval.v_list,
                                                 (char_u *)"", 0) == FAIL ||
                              list_append_number(rettv->vval.v_list,
                                                 (varnumber_T)-1) == FAIL ||
                              list_append_number(rettv->vval.v_list,
                                                 (varnumber_T)-1) == FAIL ||
                              list_append_number(rettv->vval.v_list,
                                                 (varnumber_T)-1) == FAIL))
    {
      list_free(rettv->vval.v_list);
      rettv->vval.v_list = NULL;
      goto theend;
    }
  }
  else if (type == MATCH_STR)
  {
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;
  }

  if (argvars[0].v_type == VAR_LIST)
  {
    if ((l = argvars[0].vval.v_list) == NULL)
      goto theend;
    li = l->lv_first;
  }
  else
  {
    expr = str = tv_get_string(&argvars[0]);
    len = (long)STRLEN(str);
  }

  pat = tv_get_string_buf_chk(&argvars[1], patbuf);
  if (pat == NULL)
    goto theend;

  if (argvars[2].v_type != VAR_UNKNOWN)
  {
    int error = FALSE;

    start = (long)tv_get_number_chk(&argvars[2], &error);
    if (error)
      goto theend;
    if (l != NULL)
    {
      li = list_find(l, start);
      if (li == NULL)
        goto theend;
      idx = l->lv_idx; /* use the cached index */
    }
    else
    {
      if (start < 0)
        start = 0;
      if (start > len)
        goto theend;
      /* When "count" argument is there ignore matches before "start",
	     * otherwise skip part of the string.  Differs when pattern is "^"
	     * or "\<". */
      if (argvars[3].v_type != VAR_UNKNOWN)
        startcol = start;
      else
      {
        str += start;
        len -= start;
      }
    }

    if (argvars[3].v_type != VAR_UNKNOWN)
      nth = (long)tv_get_number_chk(&argvars[3], &error);
    if (error)
      goto theend;
  }

  regmatch.regprog = vim_regcomp(pat, RE_MAGIC + RE_STRING);
  if (regmatch.regprog != NULL)
  {
    regmatch.rm_ic = p_ic;

    for (;;)
    {
      if (l != NULL)
      {
        if (li == NULL)
        {
          match = FALSE;
          break;
        }
        vim_free(tofree);
        expr = str = echo_string(&li->li_tv, &tofree, strbuf, 0);
        if (str == NULL)
          break;
      }

      match = vim_regexec_nl(&regmatch, str, (colnr_T)startcol);

      if (match && --nth <= 0)
        break;
      if (l == NULL && !match)
        break;

      /* Advance to just after the match. */
      if (l != NULL)
      {
        li = li->li_next;
        ++idx;
      }
      else
      {
        startcol = (colnr_T)(regmatch.startp[0] + (*mb_ptr2len)(regmatch.startp[0]) - str);
        if (startcol > (colnr_T)len || str + startcol <= regmatch.startp[0])
        {
          match = FALSE;
          break;
        }
      }
    }

    if (match)
    {
      if (type == MATCH_POS)
      {
        listitem_T *li1 = rettv->vval.v_list->lv_first;
        listitem_T *li2 = li1->li_next;
        listitem_T *li3 = li2->li_next;
        listitem_T *li4 = li3->li_next;

        vim_free(li1->li_tv.vval.v_string);
        li1->li_tv.vval.v_string = vim_strnsave(regmatch.startp[0],
                                                (int)(regmatch.endp[0] - regmatch.startp[0]));
        li3->li_tv.vval.v_number =
            (varnumber_T)(regmatch.startp[0] - expr);
        li4->li_tv.vval.v_number =
            (varnumber_T)(regmatch.endp[0] - expr);
        if (l != NULL)
          li2->li_tv.vval.v_number = (varnumber_T)idx;
      }
      else if (type == MATCH_LIST)
      {
        int i;

        /* return list with matched string and submatches */
        for (i = 0; i < NSUBEXP; ++i)
        {
          if (regmatch.endp[i] == NULL)
          {
            if (list_append_string(rettv->vval.v_list,
                                   (char_u *)"", 0) == FAIL)
              break;
          }
          else if (list_append_string(rettv->vval.v_list,
                                      regmatch.startp[i],
                                      (int)(regmatch.endp[i] - regmatch.startp[i])) == FAIL)
            break;
        }
      }
      else if (type == MATCH_STR)
      {
        /* return matched string */
        if (l != NULL)
          copy_tv(&li->li_tv, rettv);
        else
          rettv->vval.v_string = vim_strnsave(regmatch.startp[0],
                                              (int)(regmatch.endp[0] - regmatch.startp[0]));
      }
      else if (l != NULL)
        rettv->vval.v_number = idx;
      else
      {
        if (type != MATCH_END)
          rettv->vval.v_number =
              (varnumber_T)(regmatch.startp[0] - str);
        else
          rettv->vval.v_number =
              (varnumber_T)(regmatch.endp[0] - str);
        rettv->vval.v_number += (varnumber_T)(str - expr);
      }
    }
    vim_regfree(regmatch.regprog);
  }

theend:
  if (type == MATCH_POS && l == NULL && rettv->vval.v_list != NULL)
    /* matchstrpos() without a list: drop the second item. */
    listitem_remove(rettv->vval.v_list,
                    rettv->vval.v_list->lv_first->li_next);
  vim_free(tofree);
  p_cpo = save_cpo;
}

/*
 * "match()" function
 */
static void
f_match(typval_T *argvars, typval_T *rettv)
{
  find_some_match(argvars, rettv, MATCH_MATCH);
}

#ifdef FEAT_SEARCH_EXTRA
static int
matchadd_dict_arg(typval_T *tv, char_u **conceal_char, win_T **win)
{
  dictitem_T *di;

  if (tv->v_type != VAR_DICT)
  {
    emsg(_(e_dictreq));
    return FAIL;
  }

  if (dict_find(tv->vval.v_dict, (char_u *)"conceal", -1) != NULL)
    *conceal_char = dict_get_string(tv->vval.v_dict,
                                    (char_u *)"conceal", FALSE);

  if ((di = dict_find(tv->vval.v_dict, (char_u *)"window", -1)) != NULL)
  {
    *win = find_win_by_nr_or_id(&di->di_tv);
    if (*win == NULL)
    {
      emsg(_(e_invalwindow));
      return FAIL;
    }
  }

  return OK;
}
#endif

/*
 * "matchadd()" function
 */
static void
f_matchadd(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_SEARCH_EXTRA
  char_u buf[NUMBUFLEN];
  char_u *grp = tv_get_string_buf_chk(&argvars[0], buf); /* group */
  char_u *pat = tv_get_string_buf_chk(&argvars[1], buf); /* pattern */
  int prio = 10;                                         /* default priority */
  int id = -1;
  int error = FALSE;
  char_u *conceal_char = NULL;
  win_T *win = curwin;

  rettv->vval.v_number = -1;

  if (grp == NULL || pat == NULL)
    return;
  if (argvars[2].v_type != VAR_UNKNOWN)
  {
    prio = (int)tv_get_number_chk(&argvars[2], &error);
    if (argvars[3].v_type != VAR_UNKNOWN)
    {
      id = (int)tv_get_number_chk(&argvars[3], &error);
      if (argvars[4].v_type != VAR_UNKNOWN && matchadd_dict_arg(&argvars[4], &conceal_char, &win) == FAIL)
        return;
    }
  }
  if (error == TRUE)
    return;
  if (id >= 1 && id <= 3)
  {
    semsg(_("E798: ID is reserved for \":match\": %d"), id);
    return;
  }

  rettv->vval.v_number = match_add(win, grp, pat, prio, id, NULL,
                                   conceal_char);
#endif
}

/*
 * "matchaddpos()" function
 */
static void
f_matchaddpos(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_SEARCH_EXTRA
  char_u buf[NUMBUFLEN];
  char_u *group;
  int prio = 10;
  int id = -1;
  int error = FALSE;
  list_T *l;
  char_u *conceal_char = NULL;
  win_T *win = curwin;

  rettv->vval.v_number = -1;

  group = tv_get_string_buf_chk(&argvars[0], buf);
  if (group == NULL)
    return;

  if (argvars[1].v_type != VAR_LIST)
  {
    semsg(_(e_listarg), "matchaddpos()");
    return;
  }
  l = argvars[1].vval.v_list;
  if (l == NULL)
    return;

  if (argvars[2].v_type != VAR_UNKNOWN)
  {
    prio = (int)tv_get_number_chk(&argvars[2], &error);
    if (argvars[3].v_type != VAR_UNKNOWN)
    {
      id = (int)tv_get_number_chk(&argvars[3], &error);

      if (argvars[4].v_type != VAR_UNKNOWN && matchadd_dict_arg(&argvars[4], &conceal_char, &win) == FAIL)
        return;
    }
  }
  if (error == TRUE)
    return;

  /* id == 3 is ok because matchaddpos() is supposed to substitute :3match */
  if (id == 1 || id == 2)
  {
    semsg(_("E798: ID is reserved for \":match\": %d"), id);
    return;
  }

  rettv->vval.v_number = match_add(win, group, NULL, prio, id, l,
                                   conceal_char);
#endif
}

/*
 * "matcharg()" function
 */
static void
f_matcharg(typval_T *argvars UNUSED, typval_T *rettv)
{
  if (rettv_list_alloc(rettv) == OK)
  {
#ifdef FEAT_SEARCH_EXTRA
    int id = (int)tv_get_number(&argvars[0]);
    matchitem_T *m;

    if (id >= 1 && id <= 3)
    {
      if ((m = (matchitem_T *)get_match(curwin, id)) != NULL)
      {
        list_append_string(rettv->vval.v_list,
                           syn_id2name(m->hlg_id), -1);
        list_append_string(rettv->vval.v_list, m->pattern, -1);
      }
      else
      {
        list_append_string(rettv->vval.v_list, NULL, -1);
        list_append_string(rettv->vval.v_list, NULL, -1);
      }
    }
#endif
  }
}

/*
 * "matchdelete()" function
 */
static void
f_matchdelete(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_SEARCH_EXTRA
  win_T *win = get_optional_window(argvars, 1);

  if (win == NULL)
    rettv->vval.v_number = -1;
  else
    rettv->vval.v_number = match_delete(win,
                                        (int)tv_get_number(&argvars[0]), TRUE);
#endif
}

/*
 * "matchend()" function
 */
static void
f_matchend(typval_T *argvars, typval_T *rettv)
{
  find_some_match(argvars, rettv, MATCH_END);
}

/*
 * "matchlist()" function
 */
static void
f_matchlist(typval_T *argvars, typval_T *rettv)
{
  find_some_match(argvars, rettv, MATCH_LIST);
}

/*
 * "matchstr()" function
 */
static void
f_matchstr(typval_T *argvars, typval_T *rettv)
{
  find_some_match(argvars, rettv, MATCH_STR);
}

/*
 * "matchstrpos()" function
 */
static void
f_matchstrpos(typval_T *argvars, typval_T *rettv)
{
  find_some_match(argvars, rettv, MATCH_POS);
}

static void
max_min(typval_T *argvars, typval_T *rettv, int domax)
{
  varnumber_T n = 0;
  varnumber_T i;
  int error = FALSE;

  if (argvars[0].v_type == VAR_LIST)
  {
    list_T *l;
    listitem_T *li;

    l = argvars[0].vval.v_list;
    if (l != NULL)
    {
      li = l->lv_first;
      if (li != NULL)
      {
        n = tv_get_number_chk(&li->li_tv, &error);
        for (;;)
        {
          li = li->li_next;
          if (li == NULL)
            break;
          i = tv_get_number_chk(&li->li_tv, &error);
          if (domax ? i > n : i < n)
            n = i;
        }
      }
    }
  }
  else if (argvars[0].v_type == VAR_DICT)
  {
    dict_T *d;
    int first = TRUE;
    hashitem_T *hi;
    int todo;

    d = argvars[0].vval.v_dict;
    if (d != NULL)
    {
      todo = (int)d->dv_hashtab.ht_used;
      for (hi = d->dv_hashtab.ht_array; todo > 0; ++hi)
      {
        if (!HASHITEM_EMPTY(hi))
        {
          --todo;
          i = tv_get_number_chk(&HI2DI(hi)->di_tv, &error);
          if (first)
          {
            n = i;
            first = FALSE;
          }
          else if (domax ? i > n : i < n)
            n = i;
        }
      }
    }
  }
  else
    semsg(_(e_listdictarg), domax ? "max()" : "min()");
  rettv->vval.v_number = error ? 0 : n;
}

/*
 * "max()" function
 */
static void
f_max(typval_T *argvars, typval_T *rettv)
{
  max_min(argvars, rettv, TRUE);
}

/*
 * "min()" function
 */
static void
f_min(typval_T *argvars, typval_T *rettv)
{
  max_min(argvars, rettv, FALSE);
}

/*
 * Create the directory in which "dir" is located, and higher levels when
 * needed.
 * Return OK or FAIL.
 */
static int
mkdir_recurse(char_u *dir, int prot)
{
  char_u *p;
  char_u *updir;
  int r = FAIL;

  /* Get end of directory name in "dir".
     * We're done when it's "/" or "c:/". */
  p = gettail_sep(dir);
  if (p <= get_past_head(dir))
    return OK;

  /* If the directory exists we're done.  Otherwise: create it.*/
  updir = vim_strnsave(dir, (int)(p - dir));
  if (updir == NULL)
    return FAIL;
  if (mch_isdir(updir))
    r = OK;
  else if (mkdir_recurse(updir, prot) == OK)
    r = vim_mkdir_emsg(updir, prot);
  vim_free(updir);
  return r;
}

#ifdef vim_mkdir
/*
 * "mkdir()" function
 */
static void
f_mkdir(typval_T *argvars, typval_T *rettv)
{
  char_u *dir;
  char_u buf[NUMBUFLEN];
  int prot = 0755;

  rettv->vval.v_number = FAIL;
  if (check_restricted() || check_secure())
    return;

  dir = tv_get_string_buf(&argvars[0], buf);
  if (*dir == NUL)
    return;

  if (*gettail(dir) == NUL)
    /* remove trailing slashes */
    *gettail_sep(dir) = NUL;

  if (argvars[1].v_type != VAR_UNKNOWN)
  {
    if (argvars[2].v_type != VAR_UNKNOWN)
    {
      prot = (int)tv_get_number_chk(&argvars[2], NULL);
      if (prot == -1)
        return;
    }
    if (STRCMP(tv_get_string(&argvars[1]), "p") == 0)
    {
      if (mch_isdir(dir))
      {
        /* With the "p" flag it's OK if the dir already exists. */
        rettv->vval.v_number = OK;
        return;
      }
      mkdir_recurse(dir, prot);
    }
  }
  rettv->vval.v_number = vim_mkdir_emsg(dir, prot);
}
#endif

/*
 * "mode()" function
 */
static void
f_mode(typval_T *argvars, typval_T *rettv)
{
  char_u buf[4];

  vim_memset(buf, 0, sizeof(buf));

  if (time_for_testing == 93784)
  {
    /* Testing the two-character code. */
    buf[0] = 'x';
    buf[1] = '!';
  }
#ifdef FEAT_TERMINAL
  else if (term_use_loop())
    buf[0] = 't';
#endif
  else if (VIsual_active)
  {
    if (VIsual_select)
      buf[0] = VIsual_mode + 's' - 'v';
    else
      buf[0] = VIsual_mode;
  }
  else if (State == HITRETURN || State == ASKMORE || State == SETWSIZE || State == CONFIRM)
  {
    buf[0] = 'r';
    if (State == ASKMORE)
      buf[1] = 'm';
    else if (State == CONFIRM)
      buf[1] = '?';
  }
  else if (State == EXTERNCMD)
    buf[0] = '!';
  else if (State & INSERT)
  {
    if (State & VREPLACE_FLAG)
    {
      buf[0] = 'R';
      buf[1] = 'v';
    }
    else
    {
      if (State & REPLACE_FLAG)
        buf[0] = 'R';
      else
        buf[0] = 'i';
    }
  }
  else if ((State & CMDLINE) || exmode_active)
  {
    buf[0] = 'c';
    if (exmode_active == EXMODE_VIM)
      buf[1] = 'v';
    else if (exmode_active == EXMODE_NORMAL)
      buf[1] = 'e';
  }
  else
  {
    buf[0] = 'n';
    if (finish_op)
    {
      buf[1] = 'o';
      // to be able to detect force-linewise/blockwise/characterwise operations
      buf[2] = motion_force;
    }
    else if (restart_edit == 'I' || restart_edit == 'R' || restart_edit == 'V')
    {
      buf[1] = 'i';
      buf[2] = restart_edit;
    }
  }

  /* Clear out the minor mode when the argument is not a non-zero number or
     * non-empty string.  */
  if (!non_zero_arg(&argvars[0]))
    buf[1] = NUL;

  rettv->vval.v_string = vim_strsave(buf);
  rettv->v_type = VAR_STRING;
}

#if defined(FEAT_MZSCHEME) || defined(PROTO)
/*
 * "mzeval()" function
 */
static void
f_mzeval(typval_T *argvars, typval_T *rettv)
{
  char_u *str;
  char_u buf[NUMBUFLEN];

  if (check_restricted() || check_secure())
    return;
  str = tv_get_string_buf(&argvars[0], buf);
  do_mzeval(str, rettv);
}

void mzscheme_call_vim(char_u *name, typval_T *args, typval_T *rettv)
{
  typval_T argvars[3];

  argvars[0].v_type = VAR_STRING;
  argvars[0].vval.v_string = name;
  copy_tv(args, &argvars[1]);
  argvars[2].v_type = VAR_UNKNOWN;
  f_call(argvars, rettv);
  clear_tv(&argvars[1]);
}
#endif

/*
 * "nextnonblank()" function
 */
static void
f_nextnonblank(typval_T *argvars, typval_T *rettv)
{
  linenr_T lnum;

  for (lnum = tv_get_lnum(argvars);; ++lnum)
  {
    if (lnum < 0 || lnum > curbuf->b_ml.ml_line_count)
    {
      lnum = 0;
      break;
    }
    if (*skipwhite(ml_get(lnum)) != NUL)
      break;
  }
  rettv->vval.v_number = lnum;
}

/*
 * "nr2char()" function
 */
static void
f_nr2char(typval_T *argvars, typval_T *rettv)
{
  char_u buf[NUMBUFLEN];

  if (has_mbyte)
  {
    int utf8 = 0;

    if (argvars[1].v_type != VAR_UNKNOWN)
      utf8 = (int)tv_get_number_chk(&argvars[1], NULL);
    if (utf8)
      buf[utf_char2bytes((int)tv_get_number(&argvars[0]), buf)] = NUL;
    else
      buf[(*mb_char2bytes)((int)tv_get_number(&argvars[0]), buf)] = NUL;
  }
  else
  {
    buf[0] = (char_u)tv_get_number(&argvars[0]);
    buf[1] = NUL;
  }
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = vim_strsave(buf);
}

/*
 * "or(expr, expr)" function
 */
static void
f_or(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = tv_get_number_chk(&argvars[0], NULL) | tv_get_number_chk(&argvars[1], NULL);
}

/*
 * "pathshorten()" function
 */
static void
f_pathshorten(typval_T *argvars, typval_T *rettv)
{
  char_u *p;

  rettv->v_type = VAR_STRING;
  p = tv_get_string_chk(&argvars[0]);
  if (p == NULL)
    rettv->vval.v_string = NULL;
  else
  {
    p = vim_strsave(p);
    rettv->vval.v_string = p;
    if (p != NULL)
      shorten_dir(p);
  }
}

#ifdef FEAT_FLOAT
/*
 * "pow()" function
 */
static void
f_pow(typval_T *argvars, typval_T *rettv)
{
  float_T fx = 0.0, fy = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &fx) == OK && get_float_arg(&argvars[1], &fy) == OK)
    rettv->vval.v_float = pow(fx, fy);
  else
    rettv->vval.v_float = 0.0;
}
#endif

/*
 * "prevnonblank()" function
 */
static void
f_prevnonblank(typval_T *argvars, typval_T *rettv)
{
  linenr_T lnum;

  lnum = tv_get_lnum(argvars);
  if (lnum < 1 || lnum > curbuf->b_ml.ml_line_count)
    lnum = 0;
  else
    while (lnum >= 1 && *skipwhite(ml_get(lnum)) == NUL)
      --lnum;
  rettv->vval.v_number = lnum;
}

/* This dummy va_list is here because:
 * - passing a NULL pointer doesn't work when va_list isn't a pointer
 * - locally in the function results in a "used before set" warning
 * - using va_start() to initialize it gives "function with fixed args" error */
static va_list ap;

/*
 * "printf()" function
 */
static void
f_printf(typval_T *argvars, typval_T *rettv)
{
  char_u buf[NUMBUFLEN];
  int len;
  char_u *s;
  int saved_did_emsg = did_emsg;
  char *fmt;

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;

  /* Get the required length, allocate the buffer and do it for real. */
  did_emsg = FALSE;
  fmt = (char *)tv_get_string_buf(&argvars[0], buf);
  len = vim_vsnprintf_typval(NULL, 0, fmt, ap, argvars + 1);
  if (!did_emsg)
  {
    s = alloc(len + 1);
    if (s != NULL)
    {
      rettv->vval.v_string = s;
      (void)vim_vsnprintf_typval((char *)s, len + 1, fmt,
                                 ap, argvars + 1);
    }
  }
  did_emsg |= saved_did_emsg;
}

#ifdef FEAT_JOB_CHANNEL
/*
 * "prompt_setcallback({buffer}, {callback})" function
 */
static void
f_prompt_setcallback(typval_T *argvars, typval_T *rettv UNUSED)
{
  buf_T *buf;
  callback_T callback;

  if (check_secure())
    return;
  buf = tv_get_buf(&argvars[0], FALSE);
  if (buf == NULL)
    return;

  callback = get_callback(&argvars[1]);
  if (callback.cb_name == NULL)
    return;

  free_callback(&buf->b_prompt_callback);
  set_callback(&buf->b_prompt_callback, &callback);
}

/*
 * "prompt_setinterrupt({buffer}, {callback})" function
 */
static void
f_prompt_setinterrupt(typval_T *argvars, typval_T *rettv UNUSED)
{
  buf_T *buf;
  callback_T callback;

  if (check_secure())
    return;
  buf = tv_get_buf(&argvars[0], FALSE);
  if (buf == NULL)
    return;

  callback = get_callback(&argvars[1]);
  if (callback.cb_name == NULL)
    return;

  free_callback(&buf->b_prompt_interrupt);
  set_callback(&buf->b_prompt_interrupt, &callback);
}

/*
 * "prompt_setprompt({buffer}, {text})" function
 */
static void
f_prompt_setprompt(typval_T *argvars, typval_T *rettv UNUSED)
{
  buf_T *buf;
  char_u *text;

  if (check_secure())
    return;
  buf = tv_get_buf(&argvars[0], FALSE);
  if (buf == NULL)
    return;

  text = tv_get_string(&argvars[1]);
  vim_free(buf->b_prompt_text);
  buf->b_prompt_text = vim_strsave(text);
}
#endif

/*
 * "pumvisible()" function
 */
static void
f_pumvisible(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
}

#ifdef FEAT_PYTHON3
/*
 * "py3eval()" function
 */
static void
f_py3eval(typval_T *argvars, typval_T *rettv)
{
  char_u *str;
  char_u buf[NUMBUFLEN];

  if (check_restricted() || check_secure())
    return;

  if (p_pyx == 0)
    p_pyx = 3;

  str = tv_get_string_buf(&argvars[0], buf);
  do_py3eval(str, rettv);
}
#endif

#ifdef FEAT_PYTHON
/*
 * "pyeval()" function
 */
static void
f_pyeval(typval_T *argvars, typval_T *rettv)
{
  char_u *str;
  char_u buf[NUMBUFLEN];

  if (check_restricted() || check_secure())
    return;

  if (p_pyx == 0)
    p_pyx = 2;

  str = tv_get_string_buf(&argvars[0], buf);
  do_pyeval(str, rettv);
}
#endif

#if defined(FEAT_PYTHON) || defined(FEAT_PYTHON3)
/*
 * "pyxeval()" function
 */
static void
f_pyxeval(typval_T *argvars, typval_T *rettv)
{
  if (check_restricted() || check_secure())
    return;

#if defined(FEAT_PYTHON) && defined(FEAT_PYTHON3)
  init_pyxversion();
  if (p_pyx == 2)
    f_pyeval(argvars, rettv);
  else
    f_py3eval(argvars, rettv);
#elif defined(FEAT_PYTHON)
  f_pyeval(argvars, rettv);
#elif defined(FEAT_PYTHON3)
  f_py3eval(argvars, rettv);
#endif
}
#endif

/*
 * "range()" function
 */
static void
f_range(typval_T *argvars, typval_T *rettv)
{
  varnumber_T start;
  varnumber_T end;
  varnumber_T stride = 1;
  varnumber_T i;
  int error = FALSE;

  start = tv_get_number_chk(&argvars[0], &error);
  if (argvars[1].v_type == VAR_UNKNOWN)
  {
    end = start - 1;
    start = 0;
  }
  else
  {
    end = tv_get_number_chk(&argvars[1], &error);
    if (argvars[2].v_type != VAR_UNKNOWN)
      stride = tv_get_number_chk(&argvars[2], &error);
  }

  if (error)
    return; /* type error; errmsg already given */
  if (stride == 0)
    emsg(_("E726: Stride is zero"));
  else if (stride > 0 ? end + 1 < start : end - 1 > start)
    emsg(_("E727: Start past end"));
  else
  {
    if (rettv_list_alloc(rettv) == OK)
      for (i = start; stride > 0 ? i <= end : i >= end; i += stride)
        if (list_append_number(rettv->vval.v_list,
                               (varnumber_T)i) == FAIL)
          break;
  }
}

/*
 * Evaluate "expr" (= "context") for readdir().
 */
static int
readdir_checkitem(void *context, char_u *name)
{
  typval_T *expr = (typval_T *)context;
  typval_T save_val;
  typval_T rettv;
  typval_T argv[2];
  int retval = 0;
  int error = FALSE;

  if (expr->v_type == VAR_UNKNOWN)
    return 1;

  prepare_vimvar(VV_VAL, &save_val);
  set_vim_var_string(VV_VAL, name, -1);
  argv[0].v_type = VAR_STRING;
  argv[0].vval.v_string = name;

  if (eval_expr_typval(expr, argv, 1, &rettv) == FAIL)
    goto theend;

  retval = tv_get_number_chk(&rettv, &error);
  if (error)
    retval = -1;
  clear_tv(&rettv);

theend:
  set_vim_var_string(VV_VAL, NULL, 0);
  restore_vimvar(VV_VAL, &save_val);
  return retval;
}

/*
 * "readdir()" function
 */
static void
f_readdir(typval_T *argvars, typval_T *rettv)
{
  typval_T *expr;
  int ret;
  char_u *path;
  char_u *p;
  garray_T ga;
  int i;

  if (rettv_list_alloc(rettv) == FAIL)
    return;
  path = tv_get_string(&argvars[0]);
  expr = &argvars[1];

  ret = readdir_core(&ga, path, (void *)expr, readdir_checkitem);
  if (ret == OK && rettv->vval.v_list != NULL && ga.ga_len > 0)
  {
    for (i = 0; i < ga.ga_len; i++)
    {
      p = ((char_u **)ga.ga_data)[i];
      list_append_string(rettv->vval.v_list, p, -1);
    }
  }
  ga_clear_strings(&ga);
}

/*
 * "readfile()" function
 */
static void
f_readfile(typval_T *argvars, typval_T *rettv)
{
  int binary = FALSE;
  int blob = FALSE;
  int failed = FALSE;
  char_u *fname;
  FILE *fd;
  char_u buf[(IOSIZE / 256) * 256]; /* rounded to avoid odd + 1 */
  int io_size = sizeof(buf);
  int readlen;         /* size of last fread() */
  char_u *prev = NULL; /* previously read bytes, if any */
  long prevlen = 0;    /* length of data in prev */
  long prevsize = 0;   /* size of prev buffer */
  long maxline = MAXLNUM;
  long cnt = 0;
  char_u *p;     /* position in buf */
  char_u *start; /* start of current line */

  if (argvars[1].v_type != VAR_UNKNOWN)
  {
    if (STRCMP(tv_get_string(&argvars[1]), "b") == 0)
      binary = TRUE;
    if (STRCMP(tv_get_string(&argvars[1]), "B") == 0)
      blob = TRUE;

    if (argvars[2].v_type != VAR_UNKNOWN)
      maxline = (long)tv_get_number(&argvars[2]);
  }

  if (blob)
  {
    if (rettv_blob_alloc(rettv) == FAIL)
      return;
  }
  else
  {
    if (rettv_list_alloc(rettv) == FAIL)
      return;
  }

  /* Always open the file in binary mode, library functions have a mind of
     * their own about CR-LF conversion. */
  fname = tv_get_string(&argvars[0]);
  if (*fname == NUL || (fd = mch_fopen((char *)fname, READBIN)) == NULL)
  {
    semsg(_(e_notopen), *fname == NUL ? (char_u *)_("<empty>") : fname);
    return;
  }

  if (blob)
  {
    if (read_blob(fd, rettv->vval.v_blob) == FAIL)
    {
      emsg("cannot read file");
      blob_free(rettv->vval.v_blob);
    }
    fclose(fd);
    return;
  }

  while (cnt < maxline || maxline < 0)
  {
    readlen = (int)fread(buf, 1, io_size, fd);

    /* This for loop processes what was read, but is also entered at end
	 * of file so that either:
	 * - an incomplete line gets written
	 * - a "binary" file gets an empty line at the end if it ends in a
	 *   newline.  */
    for (p = buf, start = buf;
         p < buf + readlen || (readlen <= 0 && (prevlen > 0 || binary));
         ++p)
    {
      if (*p == '\n' || readlen <= 0)
      {
        listitem_T *li;
        char_u *s = NULL;
        long_u len = p - start;

        /* Finished a line.  Remove CRs before NL. */
        if (readlen > 0 && !binary)
        {
          while (len > 0 && start[len - 1] == '\r')
            --len;
          /* removal may cross back to the "prev" string */
          if (len == 0)
            while (prevlen > 0 && prev[prevlen - 1] == '\r')
              --prevlen;
        }
        if (prevlen == 0)
          s = vim_strnsave(start, (int)len);
        else
        {
          /* Change "prev" buffer to be the right size.  This way
		     * the bytes are only copied once, and very long lines are
		     * allocated only once.  */
          if ((s = vim_realloc(prev, prevlen + len + 1)) != NULL)
          {
            mch_memmove(s + prevlen, start, len);
            s[prevlen + len] = NUL;
            prev = NULL; /* the list will own the string */
            prevlen = prevsize = 0;
          }
        }
        if (s == NULL)
        {
          do_outofmem_msg((long_u)prevlen + len + 1);
          failed = TRUE;
          break;
        }

        if ((li = listitem_alloc()) == NULL)
        {
          vim_free(s);
          failed = TRUE;
          break;
        }
        li->li_tv.v_type = VAR_STRING;
        li->li_tv.v_lock = 0;
        li->li_tv.vval.v_string = s;
        list_append(rettv->vval.v_list, li);

        start = p + 1; /* step over newline */
        if ((++cnt >= maxline && maxline >= 0) || readlen <= 0)
          break;
      }
      else if (*p == NUL)
        *p = '\n';
      /* Check for utf8 "bom"; U+FEFF is encoded as EF BB BF.  Do this
	     * when finding the BF and check the previous two bytes. */
      else if (*p == 0xbf && enc_utf8 && !binary)
      {
        /* Find the two bytes before the 0xbf.	If p is at buf, or buf
		 * + 1, these may be in the "prev" string. */
        char_u back1 = p >= buf + 1 ? p[-1]
                                    : prevlen >= 1 ? prev[prevlen - 1] : NUL;
        char_u back2 = p >= buf + 2 ? p[-2]
                                    : p == buf + 1 && prevlen >= 1 ? prev[prevlen - 1]
                                                                   : prevlen >= 2 ? prev[prevlen - 2] : NUL;

        if (back2 == 0xef && back1 == 0xbb)
        {
          char_u *dest = p - 2;

          /* Usually a BOM is at the beginning of a file, and so at
		     * the beginning of a line; then we can just step over it.
		     */
          if (start == dest)
            start = p + 1;
          else
          {
            /* have to shuffle buf to close gap */
            int adjust_prevlen = 0;

            if (dest < buf)
            {
              adjust_prevlen = (int)(buf - dest); /* must be 1 or 2 */
              dest = buf;
            }
            if (readlen > p - buf + 1)
              mch_memmove(dest, p + 1, readlen - (p - buf) - 1);
            readlen -= 3 - adjust_prevlen;
            prevlen -= adjust_prevlen;
            p = dest - 1;
          }
        }
      }
    } /* for */

    if (failed || (cnt >= maxline && maxline >= 0) || readlen <= 0)
      break;
    if (start < p)
    {
      /* There's part of a line in buf, store it in "prev". */
      if (p - start + prevlen >= prevsize)
      {
        /* need bigger "prev" buffer */
        char_u *newprev;

        /* A common use case is ordinary text files and "prev" gets a
		 * fragment of a line, so the first allocation is made
		 * small, to avoid repeatedly 'allocing' large and
		 * 'reallocing' small. */
        if (prevsize == 0)
          prevsize = (long)(p - start);
        else
        {
          long grow50pc = (prevsize * 3) / 2;
          long growmin = (long)((p - start) * 2 + prevlen);
          prevsize = grow50pc > growmin ? grow50pc : growmin;
        }
        newprev = vim_realloc(prev, prevsize);
        if (newprev == NULL)
        {
          do_outofmem_msg((long_u)prevsize);
          failed = TRUE;
          break;
        }
        prev = newprev;
      }
      /* Add the line part to end of "prev". */
      mch_memmove(prev + prevlen, start, p - start);
      prevlen += (long)(p - start);
    }
  } /* while */

  /*
     * For a negative line count use only the lines at the end of the file,
     * free the rest.
     */
  if (!failed && maxline < 0)
    while (cnt > -maxline)
    {
      listitem_remove(rettv->vval.v_list, rettv->vval.v_list->lv_first);
      --cnt;
    }

  if (failed)
  {
    // an empty list is returned on error
    list_free(rettv->vval.v_list);
    rettv_list_alloc(rettv);
  }

  vim_free(prev);
  fclose(fd);
}

static void
return_register(int regname, typval_T *rettv)
{
  char_u buf[2] = {0, 0};

  buf[0] = (char_u)regname;
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = vim_strsave(buf);
}

/*
 * "reg_executing()" function
 */
static void
f_reg_executing(typval_T *argvars UNUSED, typval_T *rettv)
{
  return_register(reg_executing, rettv);
}

/*
 * "reg_recording()" function
 */
static void
f_reg_recording(typval_T *argvars UNUSED, typval_T *rettv)
{
  return_register(reg_recording, rettv);
}

#if defined(FEAT_RELTIME)
/*
 * Convert a List to proftime_T.
 * Return FAIL when there is something wrong.
 */
static int
list2proftime(typval_T *arg, proftime_T *tm)
{
  long n1, n2;
  int error = FALSE;

  if (arg->v_type != VAR_LIST || arg->vval.v_list == NULL || arg->vval.v_list->lv_len != 2)
    return FAIL;
  n1 = list_find_nr(arg->vval.v_list, 0L, &error);
  n2 = list_find_nr(arg->vval.v_list, 1L, &error);
#ifdef MSWIN
  tm->HighPart = n1;
  tm->LowPart = n2;
#else
  tm->tv_sec = n1;
  tm->tv_usec = n2;
#endif
  return error ? FAIL : OK;
}
#endif /* FEAT_RELTIME */

/*
 * "reltime()" function
 */
static void
f_reltime(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_RELTIME
  proftime_T res;
  proftime_T start;

  if (argvars[0].v_type == VAR_UNKNOWN)
  {
    /* No arguments: get current time. */
    profile_start(&res);
  }
  else if (argvars[1].v_type == VAR_UNKNOWN)
  {
    if (list2proftime(&argvars[0], &res) == FAIL)
      return;
    profile_end(&res);
  }
  else
  {
    /* Two arguments: compute the difference. */
    if (list2proftime(&argvars[0], &start) == FAIL || list2proftime(&argvars[1], &res) == FAIL)
      return;
    profile_sub(&res, &start);
  }

  if (rettv_list_alloc(rettv) == OK)
  {
    long n1, n2;

#ifdef MSWIN
    n1 = res.HighPart;
    n2 = res.LowPart;
#else
    n1 = res.tv_sec;
    n2 = res.tv_usec;
#endif
    list_append_number(rettv->vval.v_list, (varnumber_T)n1);
    list_append_number(rettv->vval.v_list, (varnumber_T)n2);
  }
#endif
}

#ifdef FEAT_FLOAT
/*
 * "reltimefloat()" function
 */
static void
f_reltimefloat(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_RELTIME
  proftime_T tm;
#endif

  rettv->v_type = VAR_FLOAT;
  rettv->vval.v_float = 0;
#ifdef FEAT_RELTIME
  if (list2proftime(&argvars[0], &tm) == OK)
    rettv->vval.v_float = profile_float(&tm);
#endif
}
#endif

/*
 * "reltimestr()" function
 */
static void
f_reltimestr(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_RELTIME
  proftime_T tm;
#endif

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;
#ifdef FEAT_RELTIME
  if (list2proftime(&argvars[0], &tm) == OK)
    rettv->vval.v_string = vim_strsave((char_u *)profile_msg(&tm));
#endif
}

/*
 * "remote_expr()" function
 */
static void
f_remote_expr(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;
}

/*
 * "remote_foreground()" function
 */
static void
f_remote_foreground(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
  // Libvim: noop
}

static void
f_remote_peek(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->vval.v_number = -1;
}

static void
f_remote_read(typval_T *argvars UNUSED, typval_T *rettv)
{
  char_u *r = NULL;
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = r;
}

/*
 * "remote_send()" function
 */
static void
f_remote_send(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;
}

/*
 * "remote_startserver()" function
 */
static void
f_remote_startserver(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
  emsg(_("E942: +clientserver feature not available"));
}

/*
 * "remove()" function
 */
static void
f_remove(typval_T *argvars, typval_T *rettv)
{
  list_T *l;
  listitem_T *item, *item2;
  listitem_T *li;
  long idx;
  long end;
  char_u *key;
  dict_T *d;
  dictitem_T *di;
  char_u *arg_errmsg = (char_u *)N_("remove() argument");
  int error = FALSE;

  if (argvars[0].v_type == VAR_DICT)
  {
    if (argvars[2].v_type != VAR_UNKNOWN)
      semsg(_(e_toomanyarg), "remove()");
    else if ((d = argvars[0].vval.v_dict) != NULL && !var_check_lock(d->dv_lock, arg_errmsg, TRUE))
    {
      key = tv_get_string_chk(&argvars[1]);
      if (key != NULL)
      {
        di = dict_find(d, key, -1);
        if (di == NULL)
          semsg(_(e_dictkey), key);
        else if (!var_check_fixed(di->di_flags, arg_errmsg, TRUE) && !var_check_ro(di->di_flags, arg_errmsg, TRUE))
        {
          *rettv = di->di_tv;
          init_tv(&di->di_tv);
          dictitem_remove(d, di);
        }
      }
    }
  }
  else if (argvars[0].v_type == VAR_BLOB)
  {
    idx = (long)tv_get_number_chk(&argvars[1], &error);
    if (!error)
    {
      blob_T *b = argvars[0].vval.v_blob;
      int len = blob_len(b);
      char_u *p;

      if (idx < 0)
        // count from the end
        idx = len + idx;
      if (idx < 0 || idx >= len)
      {
        semsg(_(e_blobidx), idx);
        return;
      }
      if (argvars[2].v_type == VAR_UNKNOWN)
      {
        // Remove one item, return its value.
        p = (char_u *)b->bv_ga.ga_data;
        rettv->vval.v_number = (varnumber_T) * (p + idx);
        mch_memmove(p + idx, p + idx + 1, (size_t)len - idx - 1);
        --b->bv_ga.ga_len;
      }
      else
      {
        blob_T *blob;

        // Remove range of items, return list with values.
        end = (long)tv_get_number_chk(&argvars[2], &error);
        if (error)
          return;
        if (end < 0)
          // count from the end
          end = len + end;
        if (end >= len || idx > end)
        {
          semsg(_(e_blobidx), end);
          return;
        }
        blob = blob_alloc();
        if (blob == NULL)
          return;
        blob->bv_ga.ga_len = end - idx + 1;
        if (ga_grow(&blob->bv_ga, end - idx + 1) == FAIL)
        {
          vim_free(blob);
          return;
        }
        p = (char_u *)b->bv_ga.ga_data;
        mch_memmove((char_u *)blob->bv_ga.ga_data, p + idx,
                    (size_t)(end - idx + 1));
        ++blob->bv_refcount;
        rettv->v_type = VAR_BLOB;
        rettv->vval.v_blob = blob;

        mch_memmove(p + idx, p + end + 1, (size_t)(len - end));
        b->bv_ga.ga_len -= end - idx + 1;
      }
    }
  }
  else if (argvars[0].v_type != VAR_LIST)
    semsg(_(e_listdictblobarg), "remove()");
  else if ((l = argvars[0].vval.v_list) != NULL && !var_check_lock(l->lv_lock, arg_errmsg, TRUE))
  {
    idx = (long)tv_get_number_chk(&argvars[1], &error);
    if (error)
      ; // type error: do nothing, errmsg already given
    else if ((item = list_find(l, idx)) == NULL)
      semsg(_(e_listidx), idx);
    else
    {
      if (argvars[2].v_type == VAR_UNKNOWN)
      {
        /* Remove one item, return its value. */
        vimlist_remove(l, item, item);
        *rettv = item->li_tv;
        vim_free(item);
      }
      else
      {
        // Remove range of items, return list with values.
        end = (long)tv_get_number_chk(&argvars[2], &error);
        if (error)
          ; // type error: do nothing
        else if ((item2 = list_find(l, end)) == NULL)
          semsg(_(e_listidx), end);
        else
        {
          int cnt = 0;

          for (li = item; li != NULL; li = li->li_next)
          {
            ++cnt;
            if (li == item2)
              break;
          }
          if (li == NULL) /* didn't find "item2" after "item" */
            emsg(_(e_invrange));
          else
          {
            vimlist_remove(l, item, item2);
            if (rettv_list_alloc(rettv) == OK)
            {
              l = rettv->vval.v_list;
              l->lv_first = item;
              l->lv_last = item2;
              item->li_prev = NULL;
              item2->li_next = NULL;
              l->lv_len = cnt;
            }
          }
        }
      }
    }
  }
}

/*
 * "rename({from}, {to})" function
 */
static void
f_rename(typval_T *argvars, typval_T *rettv)
{
  char_u buf[NUMBUFLEN];

  if (check_restricted() || check_secure())
    rettv->vval.v_number = -1;
  else
    rettv->vval.v_number = vim_rename(tv_get_string(&argvars[0]),
                                      tv_get_string_buf(&argvars[1], buf));
}

/*
 * "repeat()" function
 */
static void
f_repeat(typval_T *argvars, typval_T *rettv)
{
  char_u *p;
  int n;
  int slen;
  int len;
  char_u *r;
  int i;

  n = (int)tv_get_number(&argvars[1]);
  if (argvars[0].v_type == VAR_LIST)
  {
    if (rettv_list_alloc(rettv) == OK && argvars[0].vval.v_list != NULL)
      while (n-- > 0)
        if (list_extend(rettv->vval.v_list,
                        argvars[0].vval.v_list, NULL) == FAIL)
          break;
  }
  else
  {
    p = tv_get_string(&argvars[0]);
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;

    slen = (int)STRLEN(p);
    len = slen * n;
    if (len <= 0)
      return;

    r = alloc(len + 1);
    if (r != NULL)
    {
      for (i = 0; i < n; i++)
        mch_memmove(r + i * slen, p, (size_t)slen);
      r[len] = NUL;
    }

    rettv->vval.v_string = r;
  }
}

/*
 * "resolve()" function
 */
static void
f_resolve(typval_T *argvars, typval_T *rettv)
{
  char_u *p;
#ifdef HAVE_READLINK
  char_u *buf = NULL;
#endif

  p = tv_get_string(&argvars[0]);
#ifdef FEAT_SHORTCUT
  {
    char_u *v = NULL;

    v = mch_resolve_path(p, TRUE);
    if (v != NULL)
      rettv->vval.v_string = v;
    else
      rettv->vval.v_string = vim_strsave(p);
  }
#else
#ifdef HAVE_READLINK
  {
    char_u *cpy;
    int len;
    char_u *remain = NULL;
    char_u *q;
    int is_relative_to_current = FALSE;
    int has_trailing_pathsep = FALSE;
    int limit = 100;

    p = vim_strsave(p);

    if (p[0] == '.' && (vim_ispathsep(p[1]) || (p[1] == '.' && (vim_ispathsep(p[2])))))
      is_relative_to_current = TRUE;

    len = STRLEN(p);
    if (len > 0 && after_pathsep(p, p + len))
    {
      has_trailing_pathsep = TRUE;
      p[len - 1] = NUL; /* the trailing slash breaks readlink() */
    }

    q = getnextcomp(p);
    if (*q != NUL)
    {
      /* Separate the first path component in "p", and keep the
	     * remainder (beginning with the path separator). */
      remain = vim_strsave(q - 1);
      q[-1] = NUL;
    }

    buf = alloc(MAXPATHL + 1);
    if (buf == NULL)
      goto fail;

    for (;;)
    {
      for (;;)
      {
        len = readlink((char *)p, (char *)buf, MAXPATHL);
        if (len <= 0)
          break;
        buf[len] = NUL;

        if (limit-- == 0)
        {
          vim_free(p);
          vim_free(remain);
          emsg(_("E655: Too many symbolic links (cycle?)"));
          rettv->vval.v_string = NULL;
          goto fail;
        }

        /* Ensure that the result will have a trailing path separator
		 * if the argument has one. */
        if (remain == NULL && has_trailing_pathsep)
          add_pathsep(buf);

        /* Separate the first path component in the link value and
		 * concatenate the remainders. */
        q = getnextcomp(vim_ispathsep(*buf) ? buf + 1 : buf);
        if (*q != NUL)
        {
          if (remain == NULL)
            remain = vim_strsave(q - 1);
          else
          {
            cpy = concat_str(q - 1, remain);
            if (cpy != NULL)
            {
              vim_free(remain);
              remain = cpy;
            }
          }
          q[-1] = NUL;
        }

        q = gettail(p);
        if (q > p && *q == NUL)
        {
          /* Ignore trailing path separator. */
          q[-1] = NUL;
          q = gettail(p);
        }
        if (q > p && !mch_isFullName(buf))
        {
          /* symlink is relative to directory of argument */
          cpy = alloc(STRLEN(p) + STRLEN(buf) + 1);
          if (cpy != NULL)
          {
            STRCPY(cpy, p);
            STRCPY(gettail(cpy), buf);
            vim_free(p);
            p = cpy;
          }
        }
        else
        {
          vim_free(p);
          p = vim_strsave(buf);
        }
      }

      if (remain == NULL)
        break;

      /* Append the first path component of "remain" to "p". */
      q = getnextcomp(remain + 1);
      len = q - remain - (*q != NUL);
      cpy = vim_strnsave(p, STRLEN(p) + len);
      if (cpy != NULL)
      {
        STRNCAT(cpy, remain, len);
        vim_free(p);
        p = cpy;
      }
      /* Shorten "remain". */
      if (*q != NUL)
        STRMOVE(remain, q - 1);
      else
        VIM_CLEAR(remain);
    }

    /* If the result is a relative path name, make it explicitly relative to
	 * the current directory if and only if the argument had this form. */
    if (!vim_ispathsep(*p))
    {
      if (is_relative_to_current && *p != NUL && !(p[0] == '.' && (p[1] == NUL || vim_ispathsep(p[1]) || (p[1] == '.' && (p[2] == NUL || vim_ispathsep(p[2]))))))
      {
        /* Prepend "./". */
        cpy = concat_str((char_u *)"./", p);
        if (cpy != NULL)
        {
          vim_free(p);
          p = cpy;
        }
      }
      else if (!is_relative_to_current)
      {
        /* Strip leading "./". */
        q = p;
        while (q[0] == '.' && vim_ispathsep(q[1]))
          q += 2;
        if (q > p)
          STRMOVE(p, p + 2);
      }
    }

    /* Ensure that the result will have no trailing path separator
	 * if the argument had none.  But keep "/" or "//". */
    if (!has_trailing_pathsep)
    {
      q = p + STRLEN(p);
      if (after_pathsep(p, q))
        *gettail_sep(p) = NUL;
    }

    rettv->vval.v_string = p;
  }
#else
  rettv->vval.v_string = vim_strsave(p);
#endif
#endif

  simplify_filename(rettv->vval.v_string);

#ifdef HAVE_READLINK
fail:
  vim_free(buf);
#endif
  rettv->v_type = VAR_STRING;
}

/*
 * "reverse({list})" function
 */
static void
f_reverse(typval_T *argvars, typval_T *rettv)
{
  list_T *l;
  listitem_T *li, *ni;

  if (argvars[0].v_type == VAR_BLOB)
  {
    blob_T *b = argvars[0].vval.v_blob;
    int i, len = blob_len(b);

    for (i = 0; i < len / 2; i++)
    {
      int tmp = blob_get(b, i);

      blob_set(b, i, blob_get(b, len - i - 1));
      blob_set(b, len - i - 1, tmp);
    }
    rettv_blob_set(rettv, b);
    return;
  }

  if (argvars[0].v_type != VAR_LIST)
    semsg(_(e_listblobarg), "reverse()");
  else if ((l = argvars[0].vval.v_list) != NULL && !var_check_lock(l->lv_lock,
                                                                   (char_u *)N_("reverse() argument"), TRUE))
  {
    li = l->lv_last;
    l->lv_first = l->lv_last = NULL;
    l->lv_len = 0;
    while (li != NULL)
    {
      ni = li->li_prev;
      list_append(l, li);
      li = ni;
    }
    rettv_list_set(rettv, l);
    l->lv_idx = l->lv_len - l->lv_idx - 1;
  }
}

#define SP_NOMOVE 0x01    /* don't move cursor */
#define SP_REPEAT 0x02    /* repeat to find outer pair */
#define SP_RETCOUNT 0x04  /* return matchcount */
#define SP_SETPCMARK 0x08 /* set previous context mark */
#define SP_START 0x10     /* accept match at start position */
#define SP_SUBPAT 0x20    /* return nr of matching sub-pattern */
#define SP_END 0x40       /* leave cursor at end of match */
#define SP_COLUMN 0x80    /* start at cursor column */

/*
 * Get flags for a search function.
 * Possibly sets "p_ws".
 * Returns BACKWARD, FORWARD or zero (for an error).
 */
static int
get_search_arg(typval_T *varp, int *flagsp)
{
  int dir = FORWARD;
  char_u *flags;
  char_u nbuf[NUMBUFLEN];
  int mask;

  if (varp->v_type != VAR_UNKNOWN)
  {
    flags = tv_get_string_buf_chk(varp, nbuf);
    if (flags == NULL)
      return 0; /* type error; errmsg already given */
    while (*flags != NUL)
    {
      switch (*flags)
      {
      case 'b':
        dir = BACKWARD;
        break;
      case 'w':
        p_ws = TRUE;
        break;
      case 'W':
        p_ws = FALSE;
        break;
      default:
        mask = 0;
        if (flagsp != NULL)
          switch (*flags)
          {
          case 'c':
            mask = SP_START;
            break;
          case 'e':
            mask = SP_END;
            break;
          case 'm':
            mask = SP_RETCOUNT;
            break;
          case 'n':
            mask = SP_NOMOVE;
            break;
          case 'p':
            mask = SP_SUBPAT;
            break;
          case 'r':
            mask = SP_REPEAT;
            break;
          case 's':
            mask = SP_SETPCMARK;
            break;
          case 'z':
            mask = SP_COLUMN;
            break;
          }
        if (mask == 0)
        {
          semsg(_(e_invarg2), flags);
          dir = 0;
        }
        else
          *flagsp |= mask;
      }
      if (dir == 0)
        break;
      ++flags;
    }
  }
  return dir;
}

/*
 * Shared by search() and searchpos() functions.
 */
static int
search_cmn(typval_T *argvars, pos_T *match_pos, int *flagsp)
{
  int flags;
  char_u *pat;
  pos_T pos;
  pos_T save_cursor;
  int save_p_ws = p_ws;
  int dir;
  int retval = 0; /* default: FAIL */
  long lnum_stop = 0;
  proftime_T tm;
#ifdef FEAT_RELTIME
  long time_limit = 0;
#endif
  int options = SEARCH_KEEP;
  int subpatnum;

  pat = tv_get_string(&argvars[0]);
  dir = get_search_arg(&argvars[1], flagsp); /* may set p_ws */
  if (dir == 0)
    goto theend;
  flags = *flagsp;
  if (flags & SP_START)
    options |= SEARCH_START;
  if (flags & SP_END)
    options |= SEARCH_END;
  if (flags & SP_COLUMN)
    options |= SEARCH_COL;

  /* Optional arguments: line number to stop searching and timeout. */
  if (argvars[1].v_type != VAR_UNKNOWN && argvars[2].v_type != VAR_UNKNOWN)
  {
    lnum_stop = (long)tv_get_number_chk(&argvars[2], NULL);
    if (lnum_stop < 0)
      goto theend;
#ifdef FEAT_RELTIME
    if (argvars[3].v_type != VAR_UNKNOWN)
    {
      time_limit = (long)tv_get_number_chk(&argvars[3], NULL);
      if (time_limit < 0)
        goto theend;
    }
#endif
  }

#ifdef FEAT_RELTIME
  /* Set the time limit, if there is one. */
  profile_setlimit(time_limit, &tm);
#endif

  /*
     * This function does not accept SP_REPEAT and SP_RETCOUNT flags.
     * Check to make sure only those flags are set.
     * Also, Only the SP_NOMOVE or the SP_SETPCMARK flag can be set. Both
     * flags cannot be set. Check for that condition also.
     */
  if (((flags & (SP_REPEAT | SP_RETCOUNT)) != 0) || ((flags & SP_NOMOVE) && (flags & SP_SETPCMARK)))
  {
    semsg(_(e_invarg2), tv_get_string(&argvars[1]));
    goto theend;
  }

  pos = save_cursor = curwin->w_cursor;
  subpatnum = searchit(curwin, curbuf, &pos, NULL, dir, pat, 1L,
                       options, RE_SEARCH, (linenr_T)lnum_stop, &tm, NULL);
  if (subpatnum != FAIL)
  {
    if (flags & SP_SUBPAT)
      retval = subpatnum;
    else
      retval = pos.lnum;
    if (flags & SP_SETPCMARK)
      setpcmark();
    curwin->w_cursor = pos;
    if (match_pos != NULL)
    {
      /* Store the match cursor position */
      match_pos->lnum = pos.lnum;
      match_pos->col = pos.col + 1;
    }
    /* "/$" will put the cursor after the end of the line, may need to
	 * correct that here */
    check_cursor();
  }

  /* If 'n' flag is used: restore cursor position. */
  if (flags & SP_NOMOVE)
    curwin->w_cursor = save_cursor;
  else
    curwin->w_set_curswant = TRUE;
theend:
  p_ws = save_p_ws;

  return retval;
}

#ifdef FEAT_FLOAT

/*
 * round() is not in C90, use ceil() or floor() instead.
 */
float_T
vim_round(float_T f)
{
  return f > 0 ? floor(f + 0.5) : ceil(f - 0.5);
}

/*
 * "round({float})" function
 */
static void
f_round(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    rettv->vval.v_float = vim_round(f);
  else
    rettv->vval.v_float = 0.0;
}
#endif

/*
 * "screenattr()" function
 */
static void
f_screenattr(typval_T *argvars, typval_T *rettv)
{
  int row;
  int col;
  int c;

  row = (int)tv_get_number_chk(&argvars[0], NULL) - 1;
  col = (int)tv_get_number_chk(&argvars[1], NULL) - 1;
  if (row < 0 || row >= screen_Rows || col < 0 || col >= screen_Columns)
    c = -1;
  else
    c = ScreenAttrs[LineOffset[row] + col];
  rettv->vval.v_number = c;
}

/*
 * "screenchar()" function
 */
static void
f_screenchar(typval_T *argvars, typval_T *rettv)
{
  int row;
  int col;
  int off;
  int c;

  row = (int)tv_get_number_chk(&argvars[0], NULL) - 1;
  col = (int)tv_get_number_chk(&argvars[1], NULL) - 1;
  if (row < 0 || row >= screen_Rows || col < 0 || col >= screen_Columns)
    c = -1;
  else
  {
    off = LineOffset[row] + col;
    if (enc_utf8 && ScreenLinesUC[off] != 0)
      c = ScreenLinesUC[off];
    else
      c = ScreenLines[off];
  }
  rettv->vval.v_number = c;
}

/*
 * "screenchars()" function
 */
static void
f_screenchars(typval_T *argvars, typval_T *rettv)
{
  int row;
  int col;
  int off;
  int c;
  int i;

  if (rettv_list_alloc(rettv) == FAIL)
    return;
  row = (int)tv_get_number_chk(&argvars[0], NULL) - 1;
  col = (int)tv_get_number_chk(&argvars[1], NULL) - 1;
  if (row < 0 || row >= screen_Rows || col < 0 || col >= screen_Columns)
    return;

  off = LineOffset[row] + col;
  if (enc_utf8 && ScreenLinesUC[off] != 0)
    c = ScreenLinesUC[off];
  else
    c = ScreenLines[off];
  list_append_number(rettv->vval.v_list, (varnumber_T)c);

  if (enc_utf8)

    for (i = 0; i < Screen_mco && ScreenLinesC[i][off] != 0; ++i)
      list_append_number(rettv->vval.v_list,
                         (varnumber_T)ScreenLinesC[i][off]);
}

/*
 * "screencol()" function
 *
 * First column is 1 to be consistent with virtcol().
 */
static void
f_screencol(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->vval.v_number = screen_screencol() + 1;
}

/*
 * "screenrow()" function
 */
static void
f_screenrow(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->vval.v_number = screen_screenrow() + 1;
}

/*
 * "screenstring()" function
 */
static void
f_screenstring(typval_T *argvars, typval_T *rettv)
{
  int row;
  int col;
  int off;
  int c;
  int i;
  char_u buf[MB_MAXBYTES + 1];
  int buflen = 0;

  rettv->vval.v_string = NULL;
  rettv->v_type = VAR_STRING;

  row = (int)tv_get_number_chk(&argvars[0], NULL) - 1;
  col = (int)tv_get_number_chk(&argvars[1], NULL) - 1;
  if (row < 0 || row >= screen_Rows || col < 0 || col >= screen_Columns)
    return;

  off = LineOffset[row] + col;
  if (enc_utf8 && ScreenLinesUC[off] != 0)
    c = ScreenLinesUC[off];
  else
    c = ScreenLines[off];
  buflen += mb_char2bytes(c, buf);

  if (enc_utf8)
    for (i = 0; i < Screen_mco && ScreenLinesC[i][off] != 0; ++i)
      buflen += mb_char2bytes(ScreenLinesC[i][off], buf + buflen);

  buf[buflen] = NUL;
  rettv->vval.v_string = vim_strsave(buf);
}

/*
 * "search()" function
 */
static void
f_search(typval_T *argvars, typval_T *rettv)
{
  int flags = 0;

  rettv->vval.v_number = search_cmn(argvars, NULL, &flags);
}

/*
 * "searchdecl()" function
 */
static void
f_searchdecl(typval_T *argvars, typval_T *rettv)
{
  int locally = 1;
  int thisblock = 0;
  int error = FALSE;
  char_u *name;

  rettv->vval.v_number = 1; /* default: FAIL */

  name = tv_get_string_chk(&argvars[0]);
  if (argvars[1].v_type != VAR_UNKNOWN)
  {
    locally = (int)tv_get_number_chk(&argvars[1], &error) == 0;
    if (!error && argvars[2].v_type != VAR_UNKNOWN)
      thisblock = (int)tv_get_number_chk(&argvars[2], &error) != 0;
  }
  if (!error && name != NULL)
    rettv->vval.v_number = find_decl(name, (int)STRLEN(name),
                                     locally, thisblock, SEARCH_KEEP) == FAIL;
}

/*
 * Used by searchpair() and searchpairpos()
 */
static int
searchpair_cmn(typval_T *argvars, pos_T *match_pos)
{
  char_u *spat, *mpat, *epat;
  typval_T *skip;
  int save_p_ws = p_ws;
  int dir;
  int flags = 0;
  char_u nbuf1[NUMBUFLEN];
  char_u nbuf2[NUMBUFLEN];
  int retval = 0; /* default: FAIL */
  long lnum_stop = 0;
  long time_limit = 0;

  /* Get the three pattern arguments: start, middle, end. Will result in an
     * error if not a valid argument. */
  spat = tv_get_string_chk(&argvars[0]);
  mpat = tv_get_string_buf_chk(&argvars[1], nbuf1);
  epat = tv_get_string_buf_chk(&argvars[2], nbuf2);
  if (spat == NULL || mpat == NULL || epat == NULL)
    goto theend; /* type error */

  /* Handle the optional fourth argument: flags */
  dir = get_search_arg(&argvars[3], &flags); /* may set p_ws */
  if (dir == 0)
    goto theend;

  /* Don't accept SP_END or SP_SUBPAT.
     * Only one of the SP_NOMOVE or SP_SETPCMARK flags can be set.
     */
  if ((flags & (SP_END | SP_SUBPAT)) != 0 || ((flags & SP_NOMOVE) && (flags & SP_SETPCMARK)))
  {
    semsg(_(e_invarg2), tv_get_string(&argvars[3]));
    goto theend;
  }

  /* Using 'r' implies 'W', otherwise it doesn't work. */
  if (flags & SP_REPEAT)
    p_ws = FALSE;

  /* Optional fifth argument: skip expression */
  if (argvars[3].v_type == VAR_UNKNOWN || argvars[4].v_type == VAR_UNKNOWN)
    skip = NULL;
  else
  {
    skip = &argvars[4];
    if (skip->v_type != VAR_FUNC && skip->v_type != VAR_PARTIAL && skip->v_type != VAR_STRING)
    {
      /* Type error */
      semsg(_(e_invarg2), tv_get_string(&argvars[4]));
      goto theend;
    }
    if (argvars[5].v_type != VAR_UNKNOWN)
    {
      lnum_stop = (long)tv_get_number_chk(&argvars[5], NULL);
      if (lnum_stop < 0)
      {
        semsg(_(e_invarg2), tv_get_string(&argvars[5]));
        goto theend;
      }
#ifdef FEAT_RELTIME
      if (argvars[6].v_type != VAR_UNKNOWN)
      {
        time_limit = (long)tv_get_number_chk(&argvars[6], NULL);
        if (time_limit < 0)
        {
          semsg(_(e_invarg2), tv_get_string(&argvars[6]));
          goto theend;
        }
      }
#endif
    }
  }

  retval = do_searchpair(spat, mpat, epat, dir, skip, flags,
                         match_pos, lnum_stop, time_limit);

theend:
  p_ws = save_p_ws;

  return retval;
}

/*
 * "searchpair()" function
 */
static void
f_searchpair(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = searchpair_cmn(argvars, NULL);
}

/*
 * "searchpairpos()" function
 */
static void
f_searchpairpos(typval_T *argvars, typval_T *rettv)
{
  pos_T match_pos;
  int lnum = 0;
  int col = 0;

  if (rettv_list_alloc(rettv) == FAIL)
    return;

  if (searchpair_cmn(argvars, &match_pos) > 0)
  {
    lnum = match_pos.lnum;
    col = match_pos.col;
  }

  list_append_number(rettv->vval.v_list, (varnumber_T)lnum);
  list_append_number(rettv->vval.v_list, (varnumber_T)col);
}

/*
 * Search for a start/middle/end thing.
 * Used by searchpair(), see its documentation for the details.
 * Returns 0 or -1 for no match,
 */
long do_searchpair(
    char_u *spat,   /* start pattern */
    char_u *mpat,   /* middle pattern */
    char_u *epat,   /* end pattern */
    int dir,        /* BACKWARD or FORWARD */
    typval_T *skip, /* skip expression */
    int flags,      /* SP_SETPCMARK and other SP_ values */
    pos_T *match_pos,
    linenr_T lnum_stop,     /* stop at this line if not zero */
    long time_limit UNUSED) /* stop after this many msec */
{
  char_u *save_cpo;
  char_u *pat, *pat2 = NULL, *pat3 = NULL;
  long retval = 0;
  pos_T pos;
  pos_T firstpos;
  pos_T foundpos;
  pos_T save_cursor;
  pos_T save_pos;
  int n;
  int r;
  int nest = 1;
  int use_skip = FALSE;
  int err;
  int options = SEARCH_KEEP;
  proftime_T tm;

  /* Make 'cpoptions' empty, the 'l' flag should not be used here. */
  save_cpo = p_cpo;
  p_cpo = empty_option;

#ifdef FEAT_RELTIME
  /* Set the time limit, if there is one. */
  profile_setlimit(time_limit, &tm);
#endif

  /* Make two search patterns: start/end (pat2, for in nested pairs) and
     * start/middle/end (pat3, for the top pair). */
  pat2 = alloc(STRLEN(spat) + STRLEN(epat) + 17);
  pat3 = alloc(STRLEN(spat) + STRLEN(mpat) + STRLEN(epat) + 25);
  if (pat2 == NULL || pat3 == NULL)
    goto theend;
  sprintf((char *)pat2, "\\m\\(%s\\m\\)\\|\\(%s\\m\\)", spat, epat);
  if (*mpat == NUL)
    STRCPY(pat3, pat2);
  else
    sprintf((char *)pat3, "\\m\\(%s\\m\\)\\|\\(%s\\m\\)\\|\\(%s\\m\\)",
            spat, epat, mpat);
  if (flags & SP_START)
    options |= SEARCH_START;

  if (skip != NULL)
  {
    /* Empty string means to not use the skip expression. */
    if (skip->v_type == VAR_STRING || skip->v_type == VAR_FUNC)
      use_skip = skip->vval.v_string != NULL && *skip->vval.v_string != NUL;
  }

  save_cursor = curwin->w_cursor;
  pos = curwin->w_cursor;
  CLEAR_POS(&firstpos);
  CLEAR_POS(&foundpos);
  pat = pat3;
  for (;;)
  {
    n = searchit(curwin, curbuf, &pos, NULL, dir, pat, 1L,
                 options, RE_SEARCH, lnum_stop, &tm, NULL);
    if (n == FAIL || (firstpos.lnum != 0 && EQUAL_POS(pos, firstpos)))
      /* didn't find it or found the first match again: FAIL */
      break;

    if (firstpos.lnum == 0)
      firstpos = pos;
    if (EQUAL_POS(pos, foundpos))
    {
      /* Found the same position again.  Can happen with a pattern that
	     * has "\zs" at the end and searching backwards.  Advance one
	     * character and try again. */
      if (dir == BACKWARD)
        decl(&pos);
      else
        incl(&pos);
    }
    foundpos = pos;

    /* clear the start flag to avoid getting stuck here */
    options &= ~SEARCH_START;

    /* If the skip pattern matches, ignore this match. */
    if (use_skip)
    {
      save_pos = curwin->w_cursor;
      curwin->w_cursor = pos;
      err = FALSE;
      r = eval_expr_to_bool(skip, &err);
      curwin->w_cursor = save_pos;
      if (err)
      {
        /* Evaluating {skip} caused an error, break here. */
        curwin->w_cursor = save_cursor;
        retval = -1;
        break;
      }
      if (r)
        continue;
    }

    if ((dir == BACKWARD && n == 3) || (dir == FORWARD && n == 2))
    {
      /* Found end when searching backwards or start when searching
	     * forward: nested pair. */
      ++nest;
      pat = pat2; /* nested, don't search for middle */
    }
    else
    {
      /* Found end when searching forward or start when searching
	     * backward: end of (nested) pair; or found middle in outer pair. */
      if (--nest == 1)
        pat = pat3; /* outer level, search for middle */
    }

    if (nest == 0)
    {
      /* Found the match: return matchcount or line number. */
      if (flags & SP_RETCOUNT)
        ++retval;
      else
        retval = pos.lnum;
      if (flags & SP_SETPCMARK)
        setpcmark();
      curwin->w_cursor = pos;
      if (!(flags & SP_REPEAT))
        break;
      nest = 1; /* search for next unmatched */
    }
  }

  if (match_pos != NULL)
  {
    /* Store the match cursor position */
    match_pos->lnum = curwin->w_cursor.lnum;
    match_pos->col = curwin->w_cursor.col + 1;
  }

  /* If 'n' flag is used or search failed: restore cursor position. */
  if ((flags & SP_NOMOVE) || retval == 0)
    curwin->w_cursor = save_cursor;

theend:
  vim_free(pat2);
  vim_free(pat3);
  if (p_cpo == empty_option)
    p_cpo = save_cpo;
  else
    /* Darn, evaluating the {skip} expression changed the value. */
    free_string_option(save_cpo);

  return retval;
}

/*
 * "searchpos()" function
 */
static void
f_searchpos(typval_T *argvars, typval_T *rettv)
{
  pos_T match_pos;
  int lnum = 0;
  int col = 0;
  int n;
  int flags = 0;

  if (rettv_list_alloc(rettv) == FAIL)
    return;

  n = search_cmn(argvars, &match_pos, &flags);
  if (n > 0)
  {
    lnum = match_pos.lnum;
    col = match_pos.col;
  }

  list_append_number(rettv->vval.v_list, (varnumber_T)lnum);
  list_append_number(rettv->vval.v_list, (varnumber_T)col);
  if (flags & SP_SUBPAT)
    list_append_number(rettv->vval.v_list, (varnumber_T)n);
}

static void
f_server2client(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->vval.v_number = -1;
}

static void
f_serverlist(typval_T *argvars UNUSED, typval_T *rettv)
{
  char_u *r = NULL;

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = r;
}

/*
 * "setbufline()" function
 */
static void
f_setbufline(typval_T *argvars, typval_T *rettv)
{
  linenr_T lnum;
  buf_T *buf;

  buf = tv_get_buf(&argvars[0], FALSE);
  if (buf == NULL)
    rettv->vval.v_number = 1; /* FAIL */
  else
  {
    lnum = tv_get_lnum_buf(&argvars[1], buf);
    set_buffer_lines(buf, lnum, FALSE, &argvars[2], rettv);
  }
}

/*
 * "setbufvar()" function
 */
static void
f_setbufvar(typval_T *argvars, typval_T *rettv UNUSED)
{
  buf_T *buf;
  char_u *varname, *bufvarname;
  typval_T *varp;
  char_u nbuf[NUMBUFLEN];

  if (check_secure())
    return;
  (void)tv_get_number(&argvars[0]); /* issue errmsg if type error */
  varname = tv_get_string_chk(&argvars[1]);
  buf = tv_get_buf(&argvars[0], FALSE);
  varp = &argvars[2];

  if (buf != NULL && varname != NULL && varp != NULL)
  {
    if (*varname == '&')
    {
      long numval;
      char_u *strval;
      int error = FALSE;
      aco_save_T aco;

      /* set curbuf to be our buf, temporarily */
      aucmd_prepbuf(&aco, buf);

      ++varname;
      numval = (long)tv_get_number_chk(varp, &error);
      strval = tv_get_string_buf_chk(varp, nbuf);
      if (!error && strval != NULL)
        set_option_value(varname, numval, strval, OPT_LOCAL);

      /* reset notion of buffer */
      aucmd_restbuf(&aco);
    }
    else
    {
      buf_T *save_curbuf = curbuf;

      bufvarname = alloc(STRLEN(varname) + 3);
      if (bufvarname != NULL)
      {
        curbuf = buf;
        STRCPY(bufvarname, "b:");
        STRCPY(bufvarname + 2, varname);
        set_var(bufvarname, varp, TRUE);
        vim_free(bufvarname);
        curbuf = save_curbuf;
      }
    }
  }
}

static void
f_setcharsearch(typval_T *argvars, typval_T *rettv UNUSED)
{
  dict_T *d;
  dictitem_T *di;
  char_u *csearch;

  if (argvars[0].v_type != VAR_DICT)
  {
    emsg(_(e_dictreq));
    return;
  }

  if ((d = argvars[0].vval.v_dict) != NULL)
  {
    csearch = dict_get_string(d, (char_u *)"char", FALSE);
    if (csearch != NULL)
    {
      if (enc_utf8)
      {
        int pcc[MAX_MCO];
        int c = utfc_ptr2char(csearch, pcc);

        set_last_csearch(c, csearch, utfc_ptr2len(csearch));
      }
      else
        set_last_csearch(PTR2CHAR(csearch),
                         csearch, MB_PTR2LEN(csearch));
    }

    di = dict_find(d, (char_u *)"forward", -1);
    if (di != NULL)
      set_csearch_direction((int)tv_get_number(&di->di_tv)
                                ? FORWARD
                                : BACKWARD);

    di = dict_find(d, (char_u *)"until", -1);
    if (di != NULL)
      set_csearch_until(!!tv_get_number(&di->di_tv));
  }
}

/*
 * "setcmdpos()" function
 */
static void
f_setcmdpos(typval_T *argvars, typval_T *rettv)
{
  int pos = (int)tv_get_number(&argvars[0]) - 1;

  if (pos >= 0)
    rettv->vval.v_number = set_cmdline_pos(pos);
}

/*
 * "setenv()" function
 */
static void
f_setenv(typval_T *argvars, typval_T *rettv UNUSED)
{
  char_u namebuf[NUMBUFLEN];
  char_u valbuf[NUMBUFLEN];
  char_u *name = tv_get_string_buf(&argvars[0], namebuf);

  if (argvars[1].v_type == VAR_SPECIAL && argvars[1].vval.v_number == VVAL_NULL)
    vim_unsetenv(name);
  else
    vim_setenv(name, tv_get_string_buf(&argvars[1], valbuf));
}

/*
 * "setfperm({fname}, {mode})" function
 */
static void
f_setfperm(typval_T *argvars, typval_T *rettv)
{
  char_u *fname;
  char_u modebuf[NUMBUFLEN];
  char_u *mode_str;
  int i;
  int mask;
  int mode = 0;

  rettv->vval.v_number = 0;
  fname = tv_get_string_chk(&argvars[0]);
  if (fname == NULL)
    return;
  mode_str = tv_get_string_buf_chk(&argvars[1], modebuf);
  if (mode_str == NULL)
    return;
  if (STRLEN(mode_str) != 9)
  {
    semsg(_(e_invarg2), mode_str);
    return;
  }

  mask = 1;
  for (i = 8; i >= 0; --i)
  {
    if (mode_str[i] != '-')
      mode |= mask;
    mask = mask << 1;
  }
  rettv->vval.v_number = mch_setperm(fname, mode) == OK;
}

/*
 * "setline()" function
 */
static void
f_setline(typval_T *argvars, typval_T *rettv)
{
  linenr_T lnum = tv_get_lnum(&argvars[0]);

  set_buffer_lines(curbuf, lnum, FALSE, &argvars[1], rettv);
}

/*
 * Used by "setqflist()" and "setloclist()" functions
 */
static void
set_qf_ll_list(
    win_T *wp UNUSED,
    typval_T *list_arg UNUSED,
    typval_T *action_arg UNUSED,
    typval_T *what_arg UNUSED,
    typval_T *rettv)
{
#ifdef FEAT_QUICKFIX
  static char *e_invact = N_("E927: Invalid action: '%s'");
  char_u *act;
  int action = 0;
  static int recursive = 0;
#endif

  rettv->vval.v_number = -1;

#ifdef FEAT_QUICKFIX
  if (list_arg->v_type != VAR_LIST)
    emsg(_(e_listreq));
  else if (recursive != 0)
    emsg(_(e_au_recursive));
  else
  {
    list_T *l = list_arg->vval.v_list;
    dict_T *d = NULL;
    int valid_dict = TRUE;

    if (action_arg->v_type == VAR_STRING)
    {
      act = tv_get_string_chk(action_arg);
      if (act == NULL)
        return; /* type error; errmsg already given */
      if ((*act == 'a' || *act == 'r' || *act == ' ' || *act == 'f') &&
          act[1] == NUL)
        action = *act;
      else
        semsg(_(e_invact), act);
    }
    else if (action_arg->v_type == VAR_UNKNOWN)
      action = ' ';
    else
      emsg(_(e_stringreq));

    if (action_arg->v_type != VAR_UNKNOWN && what_arg->v_type != VAR_UNKNOWN)
    {
      if (what_arg->v_type == VAR_DICT)
        d = what_arg->vval.v_dict;
      else
      {
        emsg(_(e_dictreq));
        valid_dict = FALSE;
      }
    }

    ++recursive;
    if (l != NULL && action && valid_dict && set_errorlist(wp, l, action, (char_u *)(wp == NULL ? ":setqflist()" : ":setloclist()"), d) == OK)
      rettv->vval.v_number = 0;
    --recursive;
  }
#endif
}

/*
 * "setloclist()" function
 */
static void
f_setloclist(typval_T *argvars, typval_T *rettv)
{
  win_T *win;

  rettv->vval.v_number = -1;

  win = find_win_by_nr_or_id(&argvars[0]);
  if (win != NULL)
    set_qf_ll_list(win, &argvars[1], &argvars[2], &argvars[3], rettv);
}

/*
 * "setmatches()" function
 */
static void
f_setmatches(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_SEARCH_EXTRA
  list_T *l;
  listitem_T *li;
  dict_T *d;
  list_T *s = NULL;
  win_T *win = get_optional_window(argvars, 1);

  rettv->vval.v_number = -1;
  if (argvars[0].v_type != VAR_LIST)
  {
    emsg(_(e_listreq));
    return;
  }
  if (win == NULL)
    return;

  if ((l = argvars[0].vval.v_list) != NULL)
  {
    /* To some extent make sure that we are dealing with a list from
	 * "getmatches()". */
    li = l->lv_first;
    while (li != NULL)
    {
      if (li->li_tv.v_type != VAR_DICT || (d = li->li_tv.vval.v_dict) == NULL)
      {
        emsg(_(e_invarg));
        return;
      }
      if (!(dict_find(d, (char_u *)"group", -1) != NULL && (dict_find(d, (char_u *)"pattern", -1) != NULL || dict_find(d, (char_u *)"pos1", -1) != NULL) && dict_find(d, (char_u *)"priority", -1) != NULL && dict_find(d, (char_u *)"id", -1) != NULL))
      {
        emsg(_(e_invarg));
        return;
      }
      li = li->li_next;
    }

    clear_matches(win);
    li = l->lv_first;
    while (li != NULL)
    {
      int i = 0;
      char buf[30]; // use 30 to avoid compiler warning
      dictitem_T *di;
      char_u *group;
      int priority;
      int id;
      char_u *conceal;

      d = li->li_tv.vval.v_dict;
      if (dict_find(d, (char_u *)"pattern", -1) == NULL)
      {
        if (s == NULL)
        {
          s = list_alloc();
          if (s == NULL)
            return;
        }

        /* match from matchaddpos() */
        for (i = 1; i < 9; i++)
        {
          sprintf((char *)buf, (char *)"pos%d", i);
          if ((di = dict_find(d, (char_u *)buf, -1)) != NULL)
          {
            if (di->di_tv.v_type != VAR_LIST)
              return;

            list_append_tv(s, &di->di_tv);
            s->lv_refcount++;
          }
          else
            break;
        }
      }

      group = dict_get_string(d, (char_u *)"group", TRUE);
      priority = (int)dict_get_number(d, (char_u *)"priority");
      id = (int)dict_get_number(d, (char_u *)"id");
      conceal = dict_find(d, (char_u *)"conceal", -1) != NULL
                    ? dict_get_string(d, (char_u *)"conceal", TRUE)
                    : NULL;
      if (i == 0)
      {
        match_add(win, group,
                  dict_get_string(d, (char_u *)"pattern", FALSE),
                  priority, id, NULL, conceal);
      }
      else
      {
        match_add(win, group, NULL, priority, id, s, conceal);
        list_unref(s);
        s = NULL;
      }
      vim_free(group);
      vim_free(conceal);

      li = li->li_next;
    }
    rettv->vval.v_number = 0;
  }
#endif
}

/*
 * "setpos()" function
 */
static void
f_setpos(typval_T *argvars, typval_T *rettv)
{
  pos_T pos;
  int fnum;
  char_u *name;
  colnr_T curswant = -1;

  rettv->vval.v_number = -1;
  name = tv_get_string_chk(argvars);
  if (name != NULL)
  {
    if (list2fpos(&argvars[1], &pos, &fnum, &curswant) == OK)
    {
      if (--pos.col < 0)
        pos.col = 0;
      if (name[0] == '.' && name[1] == NUL)
      {
        /* set cursor; "fnum" is ignored */
        curwin->w_cursor = pos;
        if (curswant >= 0)
        {
          curwin->w_curswant = curswant - 1;
          curwin->w_set_curswant = FALSE;
        }
        check_cursor();
        rettv->vval.v_number = 0;
      }
      else if (name[0] == '\'' && name[1] != NUL && name[2] == NUL)
      {
        /* set mark */
        if (setmark_pos(name[1], &pos, fnum) == OK)
          rettv->vval.v_number = 0;
      }
      else
        emsg(_(e_invarg));
    }
  }
}

/*
 * "setqflist()" function
 */
static void
f_setqflist(typval_T *argvars, typval_T *rettv)
{
  set_qf_ll_list(NULL, &argvars[0], &argvars[1], &argvars[2], rettv);
}

/*
 * "setreg()" function
 */
static void
f_setreg(typval_T *argvars, typval_T *rettv)
{
  int regname;
  char_u *strregname;
  char_u *stropt;
  char_u *strval;
  int append;
  char_u yank_type;
  long block_len;

  block_len = -1;
  yank_type = MAUTO;
  append = FALSE;

  strregname = tv_get_string_chk(argvars);
  rettv->vval.v_number = 1; /* FAIL is default */

  if (strregname == NULL)
    return; /* type error; errmsg already given */
  regname = *strregname;
  if (regname == 0 || regname == '@')
    regname = '"';

  if (argvars[2].v_type != VAR_UNKNOWN)
  {
    stropt = tv_get_string_chk(&argvars[2]);
    if (stropt == NULL)
      return; /* type error */
    for (; *stropt != NUL; ++stropt)
      switch (*stropt)
      {
      case 'a':
      case 'A': /* append */
        append = TRUE;
        break;
      case 'v':
      case 'c': /* character-wise selection */
        yank_type = MCHAR;
        break;
      case 'V':
      case 'l': /* line-wise selection */
        yank_type = MLINE;
        break;
      case 'b':
      case Ctrl_V: /* block-wise selection */
        yank_type = MBLOCK;
        if (VIM_ISDIGIT(stropt[1]))
        {
          ++stropt;
          block_len = getdigits(&stropt) - 1;
          --stropt;
        }
        break;
      }
  }

  if (argvars[1].v_type == VAR_LIST)
  {
    char_u **lstval;
    char_u **allocval;
    char_u buf[NUMBUFLEN];
    char_u **curval;
    char_u **curallocval;
    list_T *ll = argvars[1].vval.v_list;
    listitem_T *li;
    int len;

    /* If the list is NULL handle like an empty list. */
    len = ll == NULL ? 0 : ll->lv_len;

    /* First half: use for pointers to result lines; second half: use for
	 * pointers to allocated copies. */
    lstval = ALLOC_MULT(char_u *, (len + 1) * 2);
    if (lstval == NULL)
      return;
    curval = lstval;
    allocval = lstval + len + 2;
    curallocval = allocval;

    for (li = ll == NULL ? NULL : ll->lv_first; li != NULL;
         li = li->li_next)
    {
      strval = tv_get_string_buf_chk(&li->li_tv, buf);
      if (strval == NULL)
        goto free_lstval;
      if (strval == buf)
      {
        /* Need to make a copy, next tv_get_string_buf_chk() will
		 * overwrite the string. */
        strval = vim_strsave(buf);
        if (strval == NULL)
          goto free_lstval;
        *curallocval++ = strval;
      }
      *curval++ = strval;
    }
    *curval++ = NULL;

    write_reg_contents_lst(regname, lstval, -1,
                           append, yank_type, block_len);
  free_lstval:
    while (curallocval > allocval)
      vim_free(*--curallocval);
    vim_free(lstval);
  }
  else
  {
    strval = tv_get_string_chk(&argvars[1]);
    if (strval == NULL)
      return;
    write_reg_contents_ex(regname, strval, -1,
                          append, yank_type, block_len);
  }
  rettv->vval.v_number = 0;
}

/*
 * "settabvar()" function
 */
static void
f_settabvar(typval_T *argvars, typval_T *rettv)
{
  tabpage_T *save_curtab;
  tabpage_T *tp;
  char_u *varname, *tabvarname;
  typval_T *varp;

  rettv->vval.v_number = 0;

  if (check_secure())
    return;

  tp = find_tabpage((int)tv_get_number_chk(&argvars[0], NULL));
  varname = tv_get_string_chk(&argvars[1]);
  varp = &argvars[2];

  if (varname != NULL && varp != NULL && tp != NULL)
  {
    save_curtab = curtab;
    goto_tabpage_tp(tp, FALSE, FALSE);

    tabvarname = alloc(STRLEN(varname) + 3);
    if (tabvarname != NULL)
    {
      STRCPY(tabvarname, "t:");
      STRCPY(tabvarname + 2, varname);
      set_var(tabvarname, varp, TRUE);
      vim_free(tabvarname);
    }

    /* Restore current tabpage */
    if (valid_tabpage(save_curtab))
      goto_tabpage_tp(save_curtab, FALSE, FALSE);
  }
}

/*
 * "settabwinvar()" function
 */
static void
f_settabwinvar(typval_T *argvars, typval_T *rettv)
{
  setwinvar(argvars, rettv, 1);
}

/*
 * "settagstack()" function
 */
static void
f_settagstack(typval_T *argvars, typval_T *rettv)
{
  static char *e_invact2 = N_("E962: Invalid action: '%s'");
  win_T *wp;
  dict_T *d;
  int action = 'r';

  rettv->vval.v_number = -1;

  // first argument: window number or id
  wp = find_win_by_nr_or_id(&argvars[0]);
  if (wp == NULL)
    return;

  // second argument: dict with items to set in the tag stack
  if (argvars[1].v_type != VAR_DICT)
  {
    emsg(_(e_dictreq));
    return;
  }
  d = argvars[1].vval.v_dict;
  if (d == NULL)
    return;

  // third argument: action - 'a' for append and 'r' for replace.
  // default is to replace the stack.
  if (argvars[2].v_type == VAR_UNKNOWN)
    action = 'r';
  else if (argvars[2].v_type == VAR_STRING)
  {
    char_u *actstr;
    actstr = tv_get_string_chk(&argvars[2]);
    if (actstr == NULL)
      return;
    if ((*actstr == 'r' || *actstr == 'a') && actstr[1] == NUL)
      action = *actstr;
    else
    {
      semsg(_(e_invact2), actstr);
      return;
    }
  }
  else
  {
    emsg(_(e_stringreq));
    return;
  }

  if (set_tagstack(wp, d, action) == OK)
    rettv->vval.v_number = 0;
}

/*
 * "setwinvar()" function
 */
static void
f_setwinvar(typval_T *argvars, typval_T *rettv)
{
  setwinvar(argvars, rettv, 0);
}

/*
 * "shellescape({string})" function
 */
static void
f_shellescape(typval_T *argvars, typval_T *rettv)
{
  int do_special = non_zero_arg(&argvars[1]);

  rettv->vval.v_string = vim_strsave_shellescape(
      tv_get_string(&argvars[0]), do_special, do_special);
  rettv->v_type = VAR_STRING;
}

/*
 * shiftwidth() function
 */
static void
f_shiftwidth(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->vval.v_number = 0;

  if (argvars[0].v_type != VAR_UNKNOWN)
  {
    long col;

    col = (long)tv_get_number_chk(argvars, NULL);
    if (col < 0)
      return; // type error; errmsg already given
#ifdef FEAT_VARTABS
    rettv->vval.v_number = get_sw_value_col(curbuf, col);
    return;
#endif
  }

  rettv->vval.v_number = get_sw_value(curbuf);
}

#ifdef FEAT_SIGNS
/*
 * "sign_define()" function
 */
static void
f_sign_define(typval_T *argvars, typval_T *rettv)
{
  char_u *name;
  dict_T *dict;
  char_u *icon = NULL;
  char_u *linehl = NULL;
  char_u *text = NULL;
  char_u *texthl = NULL;

  rettv->vval.v_number = -1;

  name = tv_get_string_chk(&argvars[0]);
  if (name == NULL)
    return;

  if (argvars[1].v_type != VAR_UNKNOWN)
  {
    if (argvars[1].v_type != VAR_DICT)
    {
      emsg(_(e_dictreq));
      return;
    }

    // sign attributes
    dict = argvars[1].vval.v_dict;
    if (dict_find(dict, (char_u *)"icon", -1) != NULL)
      icon = dict_get_string(dict, (char_u *)"icon", TRUE);
    if (dict_find(dict, (char_u *)"linehl", -1) != NULL)
      linehl = dict_get_string(dict, (char_u *)"linehl", TRUE);
    if (dict_find(dict, (char_u *)"text", -1) != NULL)
      text = dict_get_string(dict, (char_u *)"text", TRUE);
    if (dict_find(dict, (char_u *)"texthl", -1) != NULL)
      texthl = dict_get_string(dict, (char_u *)"texthl", TRUE);
  }

  if (sign_define_by_name(name, icon, linehl, text, texthl) == OK)
    rettv->vval.v_number = 0;

  vim_free(icon);
  vim_free(linehl);
  vim_free(text);
  vim_free(texthl);
}

/*
 * "sign_getdefined()" function
 */
static void
f_sign_getdefined(typval_T *argvars, typval_T *rettv)
{
  char_u *name = NULL;

  if (rettv_list_alloc_id(rettv, aid_sign_getdefined) != OK)
    return;

  if (argvars[0].v_type != VAR_UNKNOWN)
    name = tv_get_string(&argvars[0]);

  sign_getlist(name, rettv->vval.v_list);
}

/*
 * "sign_getplaced()" function
 */
static void
f_sign_getplaced(typval_T *argvars, typval_T *rettv)
{
  buf_T *buf = NULL;
  dict_T *dict;
  dictitem_T *di;
  linenr_T lnum = 0;
  int sign_id = 0;
  char_u *group = NULL;
  int notanum = FALSE;

  if (rettv_list_alloc_id(rettv, aid_sign_getplaced) != OK)
    return;

  if (argvars[0].v_type != VAR_UNKNOWN)
  {
    // get signs placed in the specified buffer
    buf = get_buf_arg(&argvars[0]);
    if (buf == NULL)
      return;

    if (argvars[1].v_type != VAR_UNKNOWN)
    {
      if (argvars[1].v_type != VAR_DICT ||
          ((dict = argvars[1].vval.v_dict) == NULL))
      {
        emsg(_(e_dictreq));
        return;
      }
      if ((di = dict_find(dict, (char_u *)"lnum", -1)) != NULL)
      {
        // get signs placed at this line
        (void)tv_get_number_chk(&di->di_tv, &notanum);
        if (notanum)
          return;
        lnum = tv_get_lnum(&di->di_tv);
      }
      if ((di = dict_find(dict, (char_u *)"id", -1)) != NULL)
      {
        // get sign placed with this identifier
        sign_id = (int)tv_get_number_chk(&di->di_tv, &notanum);
        if (notanum)
          return;
      }
      if ((di = dict_find(dict, (char_u *)"group", -1)) != NULL)
      {
        group = tv_get_string_chk(&di->di_tv);
        if (group == NULL)
          return;
        if (*group == '\0') // empty string means global group
          group = NULL;
      }
    }
  }

  sign_get_placed(buf, lnum, sign_id, group, rettv->vval.v_list);
}

/*
 * "sign_jump()" function
 */
static void
f_sign_jump(typval_T *argvars, typval_T *rettv)
{
  int sign_id;
  char_u *sign_group = NULL;
  buf_T *buf;
  int notanum = FALSE;

  rettv->vval.v_number = -1;

  // Sign identifier
  sign_id = (int)tv_get_number_chk(&argvars[0], &notanum);
  if (notanum)
    return;
  if (sign_id <= 0)
  {
    emsg(_(e_invarg));
    return;
  }

  // Sign group
  sign_group = tv_get_string_chk(&argvars[1]);
  if (sign_group == NULL)
    return;
  if (sign_group[0] == '\0')
    sign_group = NULL; // global sign group
  else
  {
    sign_group = vim_strsave(sign_group);
    if (sign_group == NULL)
      return;
  }

  // Buffer to place the sign
  buf = get_buf_arg(&argvars[2]);
  if (buf == NULL)
    goto cleanup;

  rettv->vval.v_number = sign_jump(sign_id, sign_group, buf);

cleanup:
  vim_free(sign_group);
}

/*
 * "sign_place()" function
 */
static void
f_sign_place(typval_T *argvars, typval_T *rettv)
{
  int sign_id;
  char_u *group = NULL;
  char_u *sign_name;
  buf_T *buf;
  dict_T *dict;
  dictitem_T *di;
  linenr_T lnum = 0;
  int prio = SIGN_DEF_PRIO;
  int notanum = FALSE;

  rettv->vval.v_number = -1;

  // Sign identifier
  sign_id = (int)tv_get_number_chk(&argvars[0], &notanum);
  if (notanum)
    return;
  if (sign_id < 0)
  {
    emsg(_(e_invarg));
    return;
  }

  // Sign group
  group = tv_get_string_chk(&argvars[1]);
  if (group == NULL)
    return;
  if (group[0] == '\0')
    group = NULL; // global sign group
  else
  {
    group = vim_strsave(group);
    if (group == NULL)
      return;
  }

  // Sign name
  sign_name = tv_get_string_chk(&argvars[2]);
  if (sign_name == NULL)
    goto cleanup;

  // Buffer to place the sign
  buf = get_buf_arg(&argvars[3]);
  if (buf == NULL)
    goto cleanup;

  if (argvars[4].v_type != VAR_UNKNOWN)
  {
    if (argvars[4].v_type != VAR_DICT ||
        ((dict = argvars[4].vval.v_dict) == NULL))
    {
      emsg(_(e_dictreq));
      goto cleanup;
    }

    // Line number where the sign is to be placed
    if ((di = dict_find(dict, (char_u *)"lnum", -1)) != NULL)
    {
      (void)tv_get_number_chk(&di->di_tv, &notanum);
      if (notanum)
        goto cleanup;
      lnum = tv_get_lnum(&di->di_tv);
    }
    if ((di = dict_find(dict, (char_u *)"priority", -1)) != NULL)
    {
      // Sign priority
      prio = (int)tv_get_number_chk(&di->di_tv, &notanum);
      if (notanum)
        goto cleanup;
    }
  }

  if (sign_place(&sign_id, group, sign_name, buf, lnum, prio) == OK)
    rettv->vval.v_number = sign_id;

cleanup:
  vim_free(group);
}

/*
 * "sign_undefine()" function
 */
static void
f_sign_undefine(typval_T *argvars, typval_T *rettv)
{
  char_u *name;

  rettv->vval.v_number = -1;

  if (argvars[0].v_type == VAR_UNKNOWN)
  {
    // Free all the signs
    free_signs();
    rettv->vval.v_number = 0;
  }
  else
  {
    // Free only the specified sign
    name = tv_get_string_chk(&argvars[0]);
    if (name == NULL)
      return;

    if (sign_undefine_by_name(name) == OK)
      rettv->vval.v_number = 0;
  }
}

/*
 * "sign_unplace()" function
 */
static void
f_sign_unplace(typval_T *argvars, typval_T *rettv)
{
  dict_T *dict;
  dictitem_T *di;
  int sign_id = 0;
  buf_T *buf = NULL;
  char_u *group = NULL;

  rettv->vval.v_number = -1;

  if (argvars[0].v_type != VAR_STRING)
  {
    emsg(_(e_invarg));
    return;
  }

  group = tv_get_string(&argvars[0]);
  if (group[0] == '\0')
    group = NULL; // global sign group
  else
  {
    group = vim_strsave(group);
    if (group == NULL)
      return;
  }

  if (argvars[1].v_type != VAR_UNKNOWN)
  {
    if (argvars[1].v_type != VAR_DICT)
    {
      emsg(_(e_dictreq));
      goto cleanup;
    }
    dict = argvars[1].vval.v_dict;

    if ((di = dict_find(dict, (char_u *)"buffer", -1)) != NULL)
    {
      buf = get_buf_arg(&di->di_tv);
      if (buf == NULL)
        goto cleanup;
    }
    if (dict_find(dict, (char_u *)"id", -1) != NULL)
      sign_id = dict_get_number(dict, (char_u *)"id");
  }

  if (buf == NULL)
  {
    // Delete the sign in all the buffers
    FOR_ALL_BUFFERS(buf)
    if (sign_unplace(sign_id, group, buf, 0) == OK)
      rettv->vval.v_number = 0;
  }
  else
  {
    if (sign_unplace(sign_id, group, buf, 0) == OK)
      rettv->vval.v_number = 0;
  }

cleanup:
  vim_free(group);
}
#endif

/*
 * "simplify()" function
 */
static void
f_simplify(typval_T *argvars, typval_T *rettv)
{
  char_u *p;

  p = tv_get_string(&argvars[0]);
  rettv->vval.v_string = vim_strsave(p);
  simplify_filename(rettv->vval.v_string); /* simplify in place */
  rettv->v_type = VAR_STRING;
}

#ifdef FEAT_FLOAT
/*
 * "sin()" function
 */
static void
f_sin(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    rettv->vval.v_float = sin(f);
  else
    rettv->vval.v_float = 0.0;
}

/*
 * "sinh()" function
 */
static void
f_sinh(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    rettv->vval.v_float = sinh(f);
  else
    rettv->vval.v_float = 0.0;
}
#endif

static int item_compare(const void *s1, const void *s2);
static int item_compare2(const void *s1, const void *s2);

/* struct used in the array that's given to qsort() */
typedef struct
{
  listitem_T *item;
  int idx;
} sortItem_T;

/* struct storing information about current sort */
typedef struct
{
  int item_compare_ic;
  int item_compare_numeric;
  int item_compare_numbers;
#ifdef FEAT_FLOAT
  int item_compare_float;
#endif
  char_u *item_compare_func;
  partial_T *item_compare_partial;
  dict_T *item_compare_selfdict;
  int item_compare_func_err;
  int item_compare_keep_zero;
} sortinfo_T;
static sortinfo_T *sortinfo = NULL;
#define ITEM_COMPARE_FAIL 999

/*
 * Compare functions for f_sort() and f_uniq() below.
 */
static int
item_compare(const void *s1, const void *s2)
{
  sortItem_T *si1, *si2;
  typval_T *tv1, *tv2;
  char_u *p1, *p2;
  char_u *tofree1 = NULL, *tofree2 = NULL;
  int res;
  char_u numbuf1[NUMBUFLEN];
  char_u numbuf2[NUMBUFLEN];

  si1 = (sortItem_T *)s1;
  si2 = (sortItem_T *)s2;
  tv1 = &si1->item->li_tv;
  tv2 = &si2->item->li_tv;

  if (sortinfo->item_compare_numbers)
  {
    varnumber_T v1 = tv_get_number(tv1);
    varnumber_T v2 = tv_get_number(tv2);

    return v1 == v2 ? 0 : v1 > v2 ? 1 : -1;
  }

#ifdef FEAT_FLOAT
  if (sortinfo->item_compare_float)
  {
    float_T v1 = tv_get_float(tv1);
    float_T v2 = tv_get_float(tv2);

    return v1 == v2 ? 0 : v1 > v2 ? 1 : -1;
  }
#endif

  /* tv2string() puts quotes around a string and allocates memory.  Don't do
     * that for string variables. Use a single quote when comparing with a
     * non-string to do what the docs promise. */
  if (tv1->v_type == VAR_STRING)
  {
    if (tv2->v_type != VAR_STRING || sortinfo->item_compare_numeric)
      p1 = (char_u *)"'";
    else
      p1 = tv1->vval.v_string;
  }
  else
    p1 = tv2string(tv1, &tofree1, numbuf1, 0);
  if (tv2->v_type == VAR_STRING)
  {
    if (tv1->v_type != VAR_STRING || sortinfo->item_compare_numeric)
      p2 = (char_u *)"'";
    else
      p2 = tv2->vval.v_string;
  }
  else
    p2 = tv2string(tv2, &tofree2, numbuf2, 0);
  if (p1 == NULL)
    p1 = (char_u *)"";
  if (p2 == NULL)
    p2 = (char_u *)"";
  if (!sortinfo->item_compare_numeric)
  {
    if (sortinfo->item_compare_ic)
      res = STRICMP(p1, p2);
    else
      res = STRCMP(p1, p2);
  }
  else
  {
    double n1, n2;
    n1 = strtod((char *)p1, (char **)&p1);
    n2 = strtod((char *)p2, (char **)&p2);
    res = n1 == n2 ? 0 : n1 > n2 ? 1 : -1;
  }

  /* When the result would be zero, compare the item indexes.  Makes the
     * sort stable. */
  if (res == 0 && !sortinfo->item_compare_keep_zero)
    res = si1->idx > si2->idx ? 1 : -1;

  vim_free(tofree1);
  vim_free(tofree2);
  return res;
}

static int
item_compare2(const void *s1, const void *s2)
{
  sortItem_T *si1, *si2;
  int res;
  typval_T rettv;
  typval_T argv[3];
  int dummy;
  char_u *func_name;
  partial_T *partial = sortinfo->item_compare_partial;

  /* shortcut after failure in previous call; compare all items equal */
  if (sortinfo->item_compare_func_err)
    return 0;

  si1 = (sortItem_T *)s1;
  si2 = (sortItem_T *)s2;

  if (partial == NULL)
    func_name = sortinfo->item_compare_func;
  else
    func_name = partial_name(partial);

  /* Copy the values.  This is needed to be able to set v_lock to VAR_FIXED
     * in the copy without changing the original list items. */
  copy_tv(&si1->item->li_tv, &argv[0]);
  copy_tv(&si2->item->li_tv, &argv[1]);

  rettv.v_type = VAR_UNKNOWN; /* clear_tv() uses this */
  res = call_func(func_name, -1, &rettv, 2, argv, NULL, 0L, 0L, &dummy, TRUE,
                  partial, sortinfo->item_compare_selfdict);
  clear_tv(&argv[0]);
  clear_tv(&argv[1]);

  if (res == FAIL)
    res = ITEM_COMPARE_FAIL;
  else
    res = (int)tv_get_number_chk(&rettv, &sortinfo->item_compare_func_err);
  if (sortinfo->item_compare_func_err)
    res = ITEM_COMPARE_FAIL; /* return value has wrong type */
  clear_tv(&rettv);

  /* When the result would be zero, compare the pointers themselves.  Makes
     * the sort stable. */
  if (res == 0 && !sortinfo->item_compare_keep_zero)
    res = si1->idx > si2->idx ? 1 : -1;

  return res;
}

/*
 * "sort({list})" function
 */
static void
do_sort_uniq(typval_T *argvars, typval_T *rettv, int sort)
{
  list_T *l;
  listitem_T *li;
  sortItem_T *ptrs;
  sortinfo_T *old_sortinfo;
  sortinfo_T info;
  long len;
  long i;

  /* Pointer to current info struct used in compare function. Save and
     * restore the current one for nested calls. */
  old_sortinfo = sortinfo;
  sortinfo = &info;

  if (argvars[0].v_type != VAR_LIST)
    semsg(_(e_listarg), sort ? "sort()" : "uniq()");
  else
  {
    l = argvars[0].vval.v_list;
    if (l == NULL || var_check_lock(l->lv_lock,
                                    (char_u *)(sort ? N_("sort() argument") : N_("uniq() argument")),
                                    TRUE))
      goto theend;
    rettv_list_set(rettv, l);

    len = list_len(l);
    if (len <= 1)
      goto theend; /* short list sorts pretty quickly */

    info.item_compare_ic = FALSE;
    info.item_compare_numeric = FALSE;
    info.item_compare_numbers = FALSE;
#ifdef FEAT_FLOAT
    info.item_compare_float = FALSE;
#endif
    info.item_compare_func = NULL;
    info.item_compare_partial = NULL;
    info.item_compare_selfdict = NULL;
    if (argvars[1].v_type != VAR_UNKNOWN)
    {
      /* optional second argument: {func} */
      if (argvars[1].v_type == VAR_FUNC)
        info.item_compare_func = argvars[1].vval.v_string;
      else if (argvars[1].v_type == VAR_PARTIAL)
        info.item_compare_partial = argvars[1].vval.v_partial;
      else
      {
        int error = FALSE;

        i = (long)tv_get_number_chk(&argvars[1], &error);
        if (error)
          goto theend; /* type error; errmsg already given */
        if (i == 1)
          info.item_compare_ic = TRUE;
        else if (argvars[1].v_type != VAR_NUMBER)
          info.item_compare_func = tv_get_string(&argvars[1]);
        else if (i != 0)
        {
          emsg(_(e_invarg));
          goto theend;
        }
        if (info.item_compare_func != NULL)
        {
          if (*info.item_compare_func == NUL)
          {
            /* empty string means default sort */
            info.item_compare_func = NULL;
          }
          else if (STRCMP(info.item_compare_func, "n") == 0)
          {
            info.item_compare_func = NULL;
            info.item_compare_numeric = TRUE;
          }
          else if (STRCMP(info.item_compare_func, "N") == 0)
          {
            info.item_compare_func = NULL;
            info.item_compare_numbers = TRUE;
          }
#ifdef FEAT_FLOAT
          else if (STRCMP(info.item_compare_func, "f") == 0)
          {
            info.item_compare_func = NULL;
            info.item_compare_float = TRUE;
          }
#endif
          else if (STRCMP(info.item_compare_func, "i") == 0)
          {
            info.item_compare_func = NULL;
            info.item_compare_ic = TRUE;
          }
        }
      }

      if (argvars[2].v_type != VAR_UNKNOWN)
      {
        /* optional third argument: {dict} */
        if (argvars[2].v_type != VAR_DICT)
        {
          emsg(_(e_dictreq));
          goto theend;
        }
        info.item_compare_selfdict = argvars[2].vval.v_dict;
      }
    }

    /* Make an array with each entry pointing to an item in the List. */
    ptrs = ALLOC_MULT(sortItem_T, len);
    if (ptrs == NULL)
      goto theend;

    i = 0;
    if (sort)
    {
      /* sort(): ptrs will be the list to sort */
      for (li = l->lv_first; li != NULL; li = li->li_next)
      {
        ptrs[i].item = li;
        ptrs[i].idx = i;
        ++i;
      }

      info.item_compare_func_err = FALSE;
      info.item_compare_keep_zero = FALSE;
      /* test the compare function */
      if ((info.item_compare_func != NULL || info.item_compare_partial != NULL) && item_compare2((void *)&ptrs[0], (void *)&ptrs[1]) == ITEM_COMPARE_FAIL)
        emsg(_("E702: Sort compare function failed"));
      else
      {
        /* Sort the array with item pointers. */
        qsort((void *)ptrs, (size_t)len, sizeof(sortItem_T),
              info.item_compare_func == NULL && info.item_compare_partial == NULL
                  ? item_compare
                  : item_compare2);

        if (!info.item_compare_func_err)
        {
          /* Clear the List and append the items in sorted order. */
          l->lv_first = l->lv_last = l->lv_idx_item = NULL;
          l->lv_len = 0;
          for (i = 0; i < len; ++i)
            list_append(l, ptrs[i].item);
        }
      }
    }
    else
    {
      int (*item_compare_func_ptr)(const void *, const void *);

      /* f_uniq(): ptrs will be a stack of items to remove */
      info.item_compare_func_err = FALSE;
      info.item_compare_keep_zero = TRUE;
      item_compare_func_ptr = info.item_compare_func != NULL || info.item_compare_partial != NULL
                                  ? item_compare2
                                  : item_compare;

      for (li = l->lv_first; li != NULL && li->li_next != NULL;
           li = li->li_next)
      {
        if (item_compare_func_ptr((void *)&li, (void *)&li->li_next) == 0)
          ptrs[i++].item = li;
        if (info.item_compare_func_err)
        {
          emsg(_("E882: Uniq compare function failed"));
          break;
        }
      }

      if (!info.item_compare_func_err)
      {
        while (--i >= 0)
        {
          li = ptrs[i].item->li_next;
          ptrs[i].item->li_next = li->li_next;
          if (li->li_next != NULL)
            li->li_next->li_prev = ptrs[i].item;
          else
            l->lv_last = ptrs[i].item;
          list_fix_watch(l, li);
          listitem_free(li);
          l->lv_len--;
        }
      }
    }

    vim_free(ptrs);
  }
theend:
  sortinfo = old_sortinfo;
}

/*
 * "sort({list})" function
 */
static void
f_sort(typval_T *argvars, typval_T *rettv)
{
  do_sort_uniq(argvars, rettv, TRUE);
}

/*
 * "uniq({list})" function
 */
static void
f_uniq(typval_T *argvars, typval_T *rettv)
{
  do_sort_uniq(argvars, rettv, FALSE);
}

/*
 * "soundfold({word})" function
 */
static void
f_soundfold(typval_T *argvars, typval_T *rettv)
{
  char_u *s;

  rettv->v_type = VAR_STRING;
  s = tv_get_string(&argvars[0]);
  rettv->vval.v_string = vim_strsave(s);
}

/*
 * "spellbadword()" function
 */
static void
f_spellbadword(typval_T *argvars UNUSED, typval_T *rettv)
{
  char_u *word = (char_u *)"";
  hlf_T attr = HLF_COUNT;
  int len = 0;

  if (rettv_list_alloc(rettv) == FAIL)
    return;

  list_append_string(rettv->vval.v_list, word, len);
  list_append_string(rettv->vval.v_list, (char_u *)(attr == HLF_SPB ? "bad" : attr == HLF_SPR ? "rare" : attr == HLF_SPL ? "local" : attr == HLF_SPC ? "caps" : ""), -1);
}

/*
 * "spellsuggest()" function
 */
static void
f_spellsuggest(typval_T *argvars UNUSED, typval_T *rettv)
{

  if (rettv_list_alloc(rettv) == FAIL)
    return;
}

static void
f_split(typval_T *argvars, typval_T *rettv)
{
  char_u *str;
  char_u *end;
  char_u *pat = NULL;
  regmatch_T regmatch;
  char_u patbuf[NUMBUFLEN];
  char_u *save_cpo;
  int match;
  colnr_T col = 0;
  int keepempty = FALSE;
  int typeerr = FALSE;

  /* Make 'cpoptions' empty, the 'l' flag should not be used here. */
  save_cpo = p_cpo;
  p_cpo = (char_u *)"";

  str = tv_get_string(&argvars[0]);
  if (argvars[1].v_type != VAR_UNKNOWN)
  {
    pat = tv_get_string_buf_chk(&argvars[1], patbuf);
    if (pat == NULL)
      typeerr = TRUE;
    if (argvars[2].v_type != VAR_UNKNOWN)
      keepempty = (int)tv_get_number_chk(&argvars[2], &typeerr);
  }
  if (pat == NULL || *pat == NUL)
    pat = (char_u *)"[\\x01- ]\\+";

  if (rettv_list_alloc(rettv) == FAIL)
    return;
  if (typeerr)
    return;

  regmatch.regprog = vim_regcomp(pat, RE_MAGIC + RE_STRING);
  if (regmatch.regprog != NULL)
  {
    regmatch.rm_ic = FALSE;
    while (*str != NUL || keepempty)
    {
      if (*str == NUL)
        match = FALSE; /* empty item at the end */
      else
        match = vim_regexec_nl(&regmatch, str, col);
      if (match)
        end = regmatch.startp[0];
      else
        end = str + STRLEN(str);
      if (keepempty || end > str || (rettv->vval.v_list->lv_len > 0 && *str != NUL && match && end < regmatch.endp[0]))
      {
        if (list_append_string(rettv->vval.v_list, str,
                               (int)(end - str)) == FAIL)
          break;
      }
      if (!match)
        break;
      // Advance to just after the match.
      if (regmatch.endp[0] > str)
        col = 0;
      else
        // Don't get stuck at the same match.
        col = (*mb_ptr2len)(regmatch.endp[0]);
      str = regmatch.endp[0];
    }

    vim_regfree(regmatch.regprog);
  }

  p_cpo = save_cpo;
}

#ifdef FEAT_FLOAT
/*
 * "sqrt()" function
 */
static void
f_sqrt(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    rettv->vval.v_float = sqrt(f);
  else
    rettv->vval.v_float = 0.0;
}

/*
 * "str2float()" function
 */
static void
f_str2float(typval_T *argvars, typval_T *rettv)
{
  char_u *p = skipwhite(tv_get_string(&argvars[0]));
  int isneg = (*p == '-');

  if (*p == '+' || *p == '-')
    p = skipwhite(p + 1);
  (void)string2float(p, &rettv->vval.v_float);
  if (isneg)
    rettv->vval.v_float *= -1;
  rettv->v_type = VAR_FLOAT;
}
#endif

/*
 * "str2list()" function
 */
static void
f_str2list(typval_T *argvars, typval_T *rettv)
{
  char_u *p;
  int utf8 = FALSE;

  if (rettv_list_alloc(rettv) == FAIL)
    return;

  if (argvars[1].v_type != VAR_UNKNOWN)
    utf8 = (int)tv_get_number_chk(&argvars[1], NULL);

  p = tv_get_string(&argvars[0]);

  if (has_mbyte || utf8)
  {
    int (*ptr2len)(char_u *);
    int (*ptr2char)(char_u *);

    if (utf8 || enc_utf8)
    {
      ptr2len = utf_ptr2len;
      ptr2char = utf_ptr2char;
    }
    else
    {
      ptr2len = mb_ptr2len;
      ptr2char = mb_ptr2char;
    }

    for (; *p != NUL; p += (*ptr2len)(p))
      list_append_number(rettv->vval.v_list, (*ptr2char)(p));
  }
  else
    for (; *p != NUL; ++p)
      list_append_number(rettv->vval.v_list, *p);
}

/*
 * "str2nr()" function
 */
static void
f_str2nr(typval_T *argvars, typval_T *rettv)
{
  int base = 10;
  char_u *p;
  varnumber_T n;
  int what;
  int isneg;

  if (argvars[1].v_type != VAR_UNKNOWN)
  {
    base = (int)tv_get_number(&argvars[1]);
    if (base != 2 && base != 8 && base != 10 && base != 16)
    {
      emsg(_(e_invarg));
      return;
    }
  }

  p = skipwhite(tv_get_string(&argvars[0]));
  isneg = (*p == '-');
  if (*p == '+' || *p == '-')
    p = skipwhite(p + 1);
  switch (base)
  {
  case 2:
    what = STR2NR_BIN + STR2NR_FORCE;
    break;
  case 8:
    what = STR2NR_OCT + STR2NR_FORCE;
    break;
  case 16:
    what = STR2NR_HEX + STR2NR_FORCE;
    break;
  default:
    what = 0;
  }
  vim_str2nr(p, NULL, NULL, what, &n, NULL, 0, FALSE);
  // Text after the number is silently ignored.
  if (isneg)
    rettv->vval.v_number = -n;
  else
    rettv->vval.v_number = n;
}

#ifdef HAVE_STRFTIME
/*
 * "strftime({format}[, {time}])" function
 */
static void
f_strftime(typval_T *argvars, typval_T *rettv)
{
  char_u result_buf[256];
#ifdef HAVE_LOCALTIME_R
  struct tm tmval;
#endif
  struct tm *curtime;
  time_t seconds;
  char_u *p;

  rettv->v_type = VAR_STRING;

  p = tv_get_string(&argvars[0]);
  if (argvars[1].v_type == VAR_UNKNOWN)
    seconds = time(NULL);
  else
    seconds = (time_t)tv_get_number(&argvars[1]);
#ifdef HAVE_LOCALTIME_R
  curtime = localtime_r(&seconds, &tmval);
#else
  curtime = localtime(&seconds);
#endif
  /* MSVC returns NULL for an invalid value of seconds. */
  if (curtime == NULL)
    rettv->vval.v_string = vim_strsave((char_u *)_("(Invalid)"));
  else
  {
    vimconv_T conv;
    char_u *enc;

    conv.vc_type = CONV_NONE;
    enc = enc_locale();
    convert_setup(&conv, p_enc, enc);
    if (conv.vc_type != CONV_NONE)
      p = string_convert(&conv, p, NULL);
    if (p != NULL)
      (void)strftime((char *)result_buf, sizeof(result_buf),
                     (char *)p, curtime);
    else
      result_buf[0] = NUL;

    if (conv.vc_type != CONV_NONE)
      vim_free(p);
    convert_setup(&conv, enc, p_enc);
    if (conv.vc_type != CONV_NONE)
      rettv->vval.v_string = string_convert(&conv, result_buf, NULL);
    else
      rettv->vval.v_string = vim_strsave(result_buf);

    /* Release conversion descriptors */
    convert_setup(&conv, NULL, NULL);
    vim_free(enc);
  }
}
#endif

/*
 * "strgetchar()" function
 */
static void
f_strgetchar(typval_T *argvars, typval_T *rettv)
{
  char_u *str;
  int len;
  int error = FALSE;
  int charidx;
  int byteidx = 0;

  rettv->vval.v_number = -1;
  str = tv_get_string_chk(&argvars[0]);
  if (str == NULL)
    return;
  len = (int)STRLEN(str);
  charidx = (int)tv_get_number_chk(&argvars[1], &error);
  if (error)
    return;

  while (charidx >= 0 && byteidx < len)
  {
    if (charidx == 0)
    {
      rettv->vval.v_number = mb_ptr2char(str + byteidx);
      break;
    }
    --charidx;
    byteidx += MB_CPTR2LEN(str + byteidx);
  }
}

/*
 * "stridx()" function
 */
static void
f_stridx(typval_T *argvars, typval_T *rettv)
{
  char_u buf[NUMBUFLEN];
  char_u *needle;
  char_u *haystack;
  char_u *save_haystack;
  char_u *pos;
  int start_idx;

  needle = tv_get_string_chk(&argvars[1]);
  save_haystack = haystack = tv_get_string_buf_chk(&argvars[0], buf);
  rettv->vval.v_number = -1;
  if (needle == NULL || haystack == NULL)
    return; /* type error; errmsg already given */

  if (argvars[2].v_type != VAR_UNKNOWN)
  {
    int error = FALSE;

    start_idx = (int)tv_get_number_chk(&argvars[2], &error);
    if (error || start_idx >= (int)STRLEN(haystack))
      return;
    if (start_idx >= 0)
      haystack += start_idx;
  }

  pos = (char_u *)strstr((char *)haystack, (char *)needle);
  if (pos != NULL)
    rettv->vval.v_number = (varnumber_T)(pos - save_haystack);
}

/*
 * "string()" function
 */
void f_string(typval_T *argvars, typval_T *rettv)
{
  char_u *tofree;
  char_u numbuf[NUMBUFLEN];

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = tv2string(&argvars[0], &tofree, numbuf,
                                   get_copyID());
  /* Make a copy if we have a value but it's not in allocated memory. */
  if (rettv->vval.v_string != NULL && tofree == NULL)
    rettv->vval.v_string = vim_strsave(rettv->vval.v_string);
}

/*
 * "strlen()" function
 */
static void
f_strlen(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = (varnumber_T)(STRLEN(
      tv_get_string(&argvars[0])));
}

/*
 * "strchars()" function
 */
static void
f_strchars(typval_T *argvars, typval_T *rettv)
{
  char_u *s = tv_get_string(&argvars[0]);
  int skipcc = 0;
  varnumber_T len = 0;
  int (*func_mb_ptr2char_adv)(char_u * *pp);

  if (argvars[1].v_type != VAR_UNKNOWN)
    skipcc = (int)tv_get_number_chk(&argvars[1], NULL);
  if (skipcc < 0 || skipcc > 1)
    emsg(_(e_invarg));
  else
  {
    func_mb_ptr2char_adv = skipcc ? mb_ptr2char_adv : mb_cptr2char_adv;
    while (*s != NUL)
    {
      func_mb_ptr2char_adv(&s);
      ++len;
    }
    rettv->vval.v_number = len;
  }
}

/*
 * "strdisplaywidth()" function
 */
static void
f_strdisplaywidth(typval_T *argvars, typval_T *rettv)
{
  char_u *s = tv_get_string(&argvars[0]);
  int col = 0;

  if (argvars[1].v_type != VAR_UNKNOWN)
    col = (int)tv_get_number(&argvars[1]);

  rettv->vval.v_number = (varnumber_T)(linetabsize_col(col, s) - col);
}

/*
 * "strwidth()" function
 */
static void
f_strwidth(typval_T *argvars, typval_T *rettv)
{
  char_u *s = tv_get_string(&argvars[0]);

  rettv->vval.v_number = (varnumber_T)(mb_string2cells(s, -1));
}

/*
 * "strcharpart()" function
 */
static void
f_strcharpart(typval_T *argvars, typval_T *rettv)
{
  char_u *p;
  int nchar;
  int nbyte = 0;
  int charlen;
  int len = 0;
  int slen;
  int error = FALSE;

  p = tv_get_string(&argvars[0]);
  slen = (int)STRLEN(p);

  nchar = (int)tv_get_number_chk(&argvars[1], &error);
  if (!error)
  {
    if (nchar > 0)
      while (nchar > 0 && nbyte < slen)
      {
        nbyte += MB_CPTR2LEN(p + nbyte);
        --nchar;
      }
    else
      nbyte = nchar;
    if (argvars[2].v_type != VAR_UNKNOWN)
    {
      charlen = (int)tv_get_number(&argvars[2]);
      while (charlen > 0 && nbyte + len < slen)
      {
        int off = nbyte + len;

        if (off < 0)
          len += 1;
        else
          len += MB_CPTR2LEN(p + off);
        --charlen;
      }
    }
    else
      len = slen - nbyte; /* default: all bytes that are available. */
  }

  /*
     * Only return the overlap between the specified part and the actual
     * string.
     */
  if (nbyte < 0)
  {
    len += nbyte;
    nbyte = 0;
  }
  else if (nbyte > slen)
    nbyte = slen;
  if (len < 0)
    len = 0;
  else if (nbyte + len > slen)
    len = slen - nbyte;

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = vim_strnsave(p + nbyte, len);
}

/*
 * "strpart()" function
 */
static void
f_strpart(typval_T *argvars, typval_T *rettv)
{
  char_u *p;
  int n;
  int len;
  int slen;
  int error = FALSE;

  p = tv_get_string(&argvars[0]);
  slen = (int)STRLEN(p);

  n = (int)tv_get_number_chk(&argvars[1], &error);
  if (error)
    len = 0;
  else if (argvars[2].v_type != VAR_UNKNOWN)
    len = (int)tv_get_number(&argvars[2]);
  else
    len = slen - n; /* default len: all bytes that are available. */

  /*
     * Only return the overlap between the specified part and the actual
     * string.
     */
  if (n < 0)
  {
    len += n;
    n = 0;
  }
  else if (n > slen)
    n = slen;
  if (len < 0)
    len = 0;
  else if (n + len > slen)
    len = slen - n;

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = vim_strnsave(p + n, len);
}

/*
 * "strridx()" function
 */
static void
f_strridx(typval_T *argvars, typval_T *rettv)
{
  char_u buf[NUMBUFLEN];
  char_u *needle;
  char_u *haystack;
  char_u *rest;
  char_u *lastmatch = NULL;
  int haystack_len, end_idx;

  needle = tv_get_string_chk(&argvars[1]);
  haystack = tv_get_string_buf_chk(&argvars[0], buf);

  rettv->vval.v_number = -1;
  if (needle == NULL || haystack == NULL)
    return; /* type error; errmsg already given */

  haystack_len = (int)STRLEN(haystack);
  if (argvars[2].v_type != VAR_UNKNOWN)
  {
    /* Third argument: upper limit for index */
    end_idx = (int)tv_get_number_chk(&argvars[2], NULL);
    if (end_idx < 0)
      return; /* can never find a match */
  }
  else
    end_idx = haystack_len;

  if (*needle == NUL)
  {
    /* Empty string matches past the end. */
    lastmatch = haystack + end_idx;
  }
  else
  {
    for (rest = haystack; *rest != '\0'; ++rest)
    {
      rest = (char_u *)strstr((char *)rest, (char *)needle);
      if (rest == NULL || rest > haystack + end_idx)
        break;
      lastmatch = rest;
    }
  }

  if (lastmatch == NULL)
    rettv->vval.v_number = -1;
  else
    rettv->vval.v_number = (varnumber_T)(lastmatch - haystack);
}

/*
 * "strtrans()" function
 */
static void
f_strtrans(typval_T *argvars, typval_T *rettv)
{
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = transstr(tv_get_string(&argvars[0]));
}

/*
 * "submatch()" function
 */
static void
f_submatch(typval_T *argvars, typval_T *rettv)
{
  int error = FALSE;
  int no;
  int retList = 0;

  no = (int)tv_get_number_chk(&argvars[0], &error);
  if (error)
    return;
  if (no < 0 || no >= NSUBEXP)
  {
    semsg(_("E935: invalid submatch number: %d"), no);
    return;
  }
  if (argvars[1].v_type != VAR_UNKNOWN)
    retList = (int)tv_get_number_chk(&argvars[1], &error);
  if (error)
    return;

  if (retList == 0)
  {
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = reg_submatch(no);
  }
  else
  {
    rettv->v_type = VAR_LIST;
    rettv->vval.v_list = reg_submatch_list(no);
  }
}

/*
 * "substitute()" function
 */
static void
f_substitute(typval_T *argvars, typval_T *rettv)
{
  char_u patbuf[NUMBUFLEN];
  char_u subbuf[NUMBUFLEN];
  char_u flagsbuf[NUMBUFLEN];

  char_u *str = tv_get_string_chk(&argvars[0]);
  char_u *pat = tv_get_string_buf_chk(&argvars[1], patbuf);
  char_u *sub = NULL;
  typval_T *expr = NULL;
  char_u *flg = tv_get_string_buf_chk(&argvars[3], flagsbuf);

  if (argvars[2].v_type == VAR_FUNC || argvars[2].v_type == VAR_PARTIAL)
    expr = &argvars[2];
  else
    sub = tv_get_string_buf_chk(&argvars[2], subbuf);

  rettv->v_type = VAR_STRING;
  if (str == NULL || pat == NULL || (sub == NULL && expr == NULL) || flg == NULL)
    rettv->vval.v_string = NULL;
  else
    rettv->vval.v_string = do_string_sub(str, pat, sub, expr, flg);
}

/*
 * "swapinfo(swap_filename)" function
 */
static void
f_swapinfo(typval_T *argvars, typval_T *rettv)
{
  if (rettv_dict_alloc(rettv) == OK)
    get_b0_dict(tv_get_string(argvars), rettv->vval.v_dict);
}

/*
 * "swapname(expr)" function
 */
static void
f_swapname(typval_T *argvars, typval_T *rettv)
{
  buf_T *buf;

  rettv->v_type = VAR_STRING;
  buf = tv_get_buf(&argvars[0], FALSE);
  if (buf == NULL || buf->b_ml.ml_mfp == NULL || buf->b_ml.ml_mfp->mf_fname == NULL)
    rettv->vval.v_string = NULL;
  else
    rettv->vval.v_string = vim_strsave(buf->b_ml.ml_mfp->mf_fname);
}

/*
 * "synID(lnum, col, trans)" function
 */
static void
f_synID(typval_T *argvars UNUSED, typval_T *rettv)
{
  int id = 0;

  rettv->vval.v_number = id;
}

/*
 * "synIDattr(id, what [, mode])" function
 */
static void
f_synIDattr(typval_T *argvars UNUSED, typval_T *rettv)
{
  char_u *p = NULL;
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = p;
}

/*
 * "synIDtrans(id)" function
 */
static void
f_synIDtrans(typval_T *argvars UNUSED, typval_T *rettv)
{
  int id;

  id = 0;

  rettv->vval.v_number = id;
}

/*
 * "synconcealed(lnum, col)" function
 */
static void
f_synconcealed(typval_T *argvars UNUSED, typval_T *rettv)
{

  rettv_list_set(rettv, NULL);
}

/*
 * "synstack(lnum, col)" function
 */
static void
f_synstack(typval_T *argvars UNUSED, typval_T *rettv)
{

  rettv_list_set(rettv, NULL);
}

static void
get_cmd_output_as_rettv(
    typval_T *argvars,
    typval_T *rettv,
    int retlist)
{
  char_u *res = NULL;
  char_u *p;
  char_u *infile = NULL;
  int err = FALSE;
  FILE *fd;
  list_T *list = NULL;
  int flags = SHELL_SILENT;

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;
  if (check_restricted() || check_secure())
    goto errret;

  if (argvars[1].v_type != VAR_UNKNOWN)
  {
    /*
	 * Write the text to a temp file, to be used for input of the shell
	 * command.
	 */
    if ((infile = vim_tempname('i', TRUE)) == NULL)
    {
      emsg(_(e_notmp));
      goto errret;
    }

    fd = mch_fopen((char *)infile, WRITEBIN);
    if (fd == NULL)
    {
      semsg(_(e_notopen), infile);
      goto errret;
    }
    if (argvars[1].v_type == VAR_NUMBER)
    {
      linenr_T lnum;
      buf_T *buf;

      buf = buflist_findnr(argvars[1].vval.v_number);
      if (buf == NULL)
      {
        semsg(_(e_nobufnr), argvars[1].vval.v_number);
        fclose(fd);
        goto errret;
      }

      for (lnum = 1; lnum <= buf->b_ml.ml_line_count; lnum++)
      {
        for (p = ml_get_buf(buf, lnum, FALSE); *p != NUL; ++p)
          if (putc(*p == '\n' ? NUL : *p, fd) == EOF)
          {
            err = TRUE;
            break;
          }
        if (putc(NL, fd) == EOF)
        {
          err = TRUE;
          break;
        }
      }
    }
    else if (argvars[1].v_type == VAR_LIST)
    {
      if (write_list(fd, argvars[1].vval.v_list, TRUE) == FAIL)
        err = TRUE;
    }
    else
    {
      size_t len;
      char_u buf[NUMBUFLEN];

      p = tv_get_string_buf_chk(&argvars[1], buf);
      if (p == NULL)
      {
        fclose(fd);
        goto errret; /* type error; errmsg already given */
      }
      len = STRLEN(p);
      if (len > 0 && fwrite(p, len, 1, fd) != 1)
        err = TRUE;
    }
    if (fclose(fd) != 0)
      err = TRUE;
    if (err)
    {
      emsg(_("E677: Error writing temp file"));
      goto errret;
    }
  }

  /* Omit SHELL_COOKED when invoked with ":silent".  Avoids that the shell
     * echoes typeahead, that messes up the display. */
  if (!msg_silent)
    flags += SHELL_COOKED;

  if (retlist)
  {
    int len;
    listitem_T *li;
    char_u *s = NULL;
    char_u *start;
    char_u *end;
    int i;

    res = get_cmd_output(tv_get_string(&argvars[0]), infile, flags, &len);
    if (res == NULL)
      goto errret;

    list = list_alloc();
    if (list == NULL)
      goto errret;

    for (i = 0; i < len; ++i)
    {
      start = res + i;
      while (i < len && res[i] != NL)
        ++i;
      end = res + i;

      s = alloc(end - start + 1);
      if (s == NULL)
        goto errret;

      for (p = s; start < end; ++p, ++start)
        *p = *start == NUL ? NL : *start;
      *p = NUL;

      li = listitem_alloc();
      if (li == NULL)
      {
        vim_free(s);
        goto errret;
      }
      li->li_tv.v_type = VAR_STRING;
      li->li_tv.v_lock = 0;
      li->li_tv.vval.v_string = s;
      list_append(list, li);
    }

    rettv_list_set(rettv, list);
    list = NULL;
  }
  else
  {
    res = get_cmd_output(tv_get_string(&argvars[0]), infile, flags, NULL);
#ifdef USE_CRNL
    /* translate <CR><NL> into <NL> */
    if (res != NULL)
    {
      char_u *s, *d;

      d = res;
      for (s = res; *s; ++s)
      {
        if (s[0] == CAR && s[1] == NL)
          ++s;
        *d++ = *s;
      }
      *d = NUL;
    }
#endif
    rettv->vval.v_string = res;
    res = NULL;
  }

errret:
  if (infile != NULL)
  {
    mch_remove(infile);
    vim_free(infile);
  }
  if (res != NULL)
    vim_free(res);
  if (list != NULL)
    list_free(list);
}

/*
 * "system()" function
 */
static void
f_system(typval_T *argvars, typval_T *rettv)
{
  get_cmd_output_as_rettv(argvars, rettv, FALSE);
}

/*
 * "systemlist()" function
 */
static void
f_systemlist(typval_T *argvars, typval_T *rettv)
{
  get_cmd_output_as_rettv(argvars, rettv, TRUE);
}

/*
 * "tabpagebuflist()" function
 */
static void
f_tabpagebuflist(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
  tabpage_T *tp;
  win_T *wp = NULL;

  if (argvars[0].v_type == VAR_UNKNOWN)
    wp = firstwin;
  else
  {
    tp = find_tabpage((int)tv_get_number(&argvars[0]));
    if (tp != NULL)
      wp = (tp == curtab) ? firstwin : tp->tp_firstwin;
  }
  if (wp != NULL && rettv_list_alloc(rettv) != FAIL)
  {
    for (; wp != NULL; wp = wp->w_next)
      if (list_append_number(rettv->vval.v_list,
                             wp->w_buffer->b_fnum) == FAIL)
        break;
  }
}

/*
 * "tabpagenr()" function
 */
static void
f_tabpagenr(typval_T *argvars UNUSED, typval_T *rettv)
{
  int nr = 1;
  char_u *arg;

  if (argvars[0].v_type != VAR_UNKNOWN)
  {
    arg = tv_get_string_chk(&argvars[0]);
    nr = 0;
    if (arg != NULL)
    {
      if (STRCMP(arg, "$") == 0)
        nr = tabpage_index(NULL) - 1;
      else
        semsg(_(e_invexpr2), arg);
    }
  }
  else
    nr = tabpage_index(curtab);
  rettv->vval.v_number = nr;
}

/*
 * Common code for tabpagewinnr() and winnr().
 */
static int
get_winnr(tabpage_T *tp, typval_T *argvar)
{
  win_T *twin;
  int nr = 1;
  win_T *wp;
  char_u *arg;

  twin = (tp == curtab) ? curwin : tp->tp_curwin;
  if (argvar->v_type != VAR_UNKNOWN)
  {
    int invalid_arg = FALSE;

    arg = tv_get_string_chk(argvar);
    if (arg == NULL)
      nr = 0; /* type error; errmsg already given */
    else if (STRCMP(arg, "$") == 0)
      twin = (tp == curtab) ? lastwin : tp->tp_lastwin;
    else if (STRCMP(arg, "#") == 0)
    {
      twin = (tp == curtab) ? prevwin : tp->tp_prevwin;
      if (twin == NULL)
        nr = 0;
    }
    else
    {
      long count;
      char_u *endp;

      // Extract the window count (if specified). e.g. winnr('3j')
      count = strtol((char *)arg, (char **)&endp, 10);
      if (count <= 0)
        count = 1; // if count is not specified, default to 1
      if (endp != NULL && *endp != '\0')
      {
        if (STRCMP(endp, "j") == 0)
          twin = win_vert_neighbor(tp, twin, FALSE, count);
        else if (STRCMP(endp, "k") == 0)
          twin = win_vert_neighbor(tp, twin, TRUE, count);
        else if (STRCMP(endp, "h") == 0)
          twin = win_horz_neighbor(tp, twin, TRUE, count);
        else if (STRCMP(endp, "l") == 0)
          twin = win_horz_neighbor(tp, twin, FALSE, count);
        else
          invalid_arg = TRUE;
      }
      else
        invalid_arg = TRUE;
    }

    if (invalid_arg)
    {
      semsg(_(e_invexpr2), arg);
      nr = 0;
    }
  }

  if (nr > 0)
    for (wp = (tp == curtab) ? firstwin : tp->tp_firstwin;
         wp != twin; wp = wp->w_next)
    {
      if (wp == NULL)
      {
        /* didn't find it in this tabpage */
        nr = 0;
        break;
      }
      ++nr;
    }
  return nr;
}

/*
 * "tabpagewinnr()" function
 */
static void
f_tabpagewinnr(typval_T *argvars UNUSED, typval_T *rettv)
{
  int nr = 1;
  tabpage_T *tp;

  tp = find_tabpage((int)tv_get_number(&argvars[0]));
  if (tp == NULL)
    nr = 0;
  else
    nr = get_winnr(tp, &argvars[1]);
  rettv->vval.v_number = nr;
}

/*
 * "tagfiles()" function
 */
static void
f_tagfiles(typval_T *argvars UNUSED, typval_T *rettv)
{
  char_u *fname;
  tagname_T tn;
  int first;

  if (rettv_list_alloc(rettv) == FAIL)
    return;
  fname = alloc(MAXPATHL);
  if (fname == NULL)
    return;

  for (first = TRUE;; first = FALSE)
    if (get_tagfname(&tn, first, fname) == FAIL || list_append_string(rettv->vval.v_list, fname, -1) == FAIL)
      break;
  tagname_free(&tn);
  vim_free(fname);
}

/*
 * "taglist()" function
 */
static void
f_taglist(typval_T *argvars, typval_T *rettv)
{
  char_u *fname = NULL;
  char_u *tag_pattern;

  tag_pattern = tv_get_string(&argvars[0]);

  rettv->vval.v_number = FALSE;
  if (*tag_pattern == NUL)
    return;

  if (argvars[1].v_type != VAR_UNKNOWN)
    fname = tv_get_string(&argvars[1]);
  if (rettv_list_alloc(rettv) == OK)
    (void)get_tags(rettv->vval.v_list, tag_pattern, fname);
}

/*
 * "tempname()" function
 */
static void
f_tempname(typval_T *argvars UNUSED, typval_T *rettv)
{
  static int x = 'A';

  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = vim_tempname(x, FALSE);

  /* Advance 'x' to use A-Z and 0-9, so that there are at least 34 different
     * names.  Skip 'I' and 'O', they are used for shell redirection. */
  do
  {
    if (x == 'Z')
      x = '0';
    else if (x == '9')
      x = 'A';
    else
    {
#ifdef EBCDIC
      if (x == 'I')
        x = 'J';
      else if (x == 'R')
        x = 'S';
      else
#endif
        ++x;
    }
  } while (x == 'I' || x == 'O');
}

#ifdef FEAT_FLOAT
/*
 * "tan()" function
 */
static void
f_tan(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    rettv->vval.v_float = tan(f);
  else
    rettv->vval.v_float = 0.0;
}

/*
 * "tanh()" function
 */
static void
f_tanh(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    rettv->vval.v_float = tanh(f);
  else
    rettv->vval.v_float = 0.0;
}
#endif

/*
 * "test_alloc_fail(id, countdown, repeat)" function
 */
static void
f_test_alloc_fail(typval_T *argvars, typval_T *rettv UNUSED)
{
  if (argvars[0].v_type != VAR_NUMBER || argvars[0].vval.v_number <= 0 || argvars[1].v_type != VAR_NUMBER || argvars[1].vval.v_number < 0 || argvars[2].v_type != VAR_NUMBER)
    emsg(_(e_invarg));
  else
  {
    alloc_fail_id = argvars[0].vval.v_number;
    if (alloc_fail_id >= aid_last)
      emsg(_(e_invarg));
    alloc_fail_countdown = argvars[1].vval.v_number;
    alloc_fail_repeat = argvars[2].vval.v_number;
    did_outofmem_msg = FALSE;
  }
}

/*
 * "test_autochdir()"
 */
static void
f_test_autochdir(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#if defined(FEAT_AUTOCHDIR)
  test_autochdir = TRUE;
#endif
}

/*
 * "test_feedinput()"
 */
static void
f_test_feedinput(typval_T *argvars, typval_T *rettv UNUSED)
{
#ifdef USE_INPUT_BUF
  char_u *val = tv_get_string_chk(&argvars[0]);

  if (val != NULL)
  {
    trash_input_buf();
    add_to_input_buf_csi(val, (int)STRLEN(val));
  }
#endif
}

/*
 * "test_getvalue({name})" function
 */
static void
f_test_getvalue(typval_T *argvars, typval_T *rettv)
{
  if (argvars[0].v_type != VAR_STRING)
    emsg(_(e_invarg));
  else
  {
    char_u *name = tv_get_string(&argvars[0]);

    if (STRCMP(name, (char_u *)"need_fileinfo") == 0)
      rettv->vval.v_number = need_fileinfo;
    else
      semsg(_(e_invarg2), name);
  }
}

/*
 * "test_option_not_set({name})" function
 */
static void
f_test_option_not_set(typval_T *argvars, typval_T *rettv UNUSED)
{
  char_u *name = (char_u *)"";

  if (argvars[0].v_type != VAR_STRING)
    emsg(_(e_invarg));
  else
  {
    name = tv_get_string(&argvars[0]);
    if (reset_option_was_set(name) == FAIL)
      semsg(_(e_invarg2), name);
  }
}

/*
 * "test_override({name}, {val})" function
 */
static void
f_test_override(typval_T *argvars, typval_T *rettv UNUSED)
{
  char_u *name = (char_u *)"";
  int val;
  static int save_starting = -1;

  if (argvars[0].v_type != VAR_STRING || (argvars[1].v_type) != VAR_NUMBER)
    emsg(_(e_invarg));
  else
  {
    name = tv_get_string(&argvars[0]);
    val = (int)tv_get_number(&argvars[1]);

    if (STRCMP(name, (char_u *)"redraw") == 0)
      disable_redraw_for_testing = val;
    else if (STRCMP(name, (char_u *)"redraw_flag") == 0)
      ignore_redraw_flag_for_testing = val;
    else if (STRCMP(name, (char_u *)"char_avail") == 0)
      disable_char_avail_for_testing = val;
    else if (STRCMP(name, (char_u *)"starting") == 0)
    {
      if (val)
      {
        if (save_starting < 0)
          save_starting = starting;
        starting = 0;
      }
      else
      {
        starting = save_starting;
        save_starting = -1;
      }
    }
    else if (STRCMP(name, (char_u *)"nfa_fail") == 0)
      nfa_fail_for_testing = val;
    else if (STRCMP(name, (char_u *)"no_query_mouse") == 0)
      no_query_mouse_for_testing = val;
    else if (STRCMP(name, (char_u *)"ALL") == 0)
    {
      disable_char_avail_for_testing = FALSE;
      disable_redraw_for_testing = FALSE;
      ignore_redraw_flag_for_testing = FALSE;
      nfa_fail_for_testing = FALSE;
      no_query_mouse_for_testing = FALSE;
      if (save_starting >= 0)
      {
        starting = save_starting;
        save_starting = -1;
      }
    }
    else
      semsg(_(e_invarg2), name);
  }
}

/*
 * "test_refcount({expr})" function
 */
static void
f_test_refcount(typval_T *argvars, typval_T *rettv)
{
  int retval = -1;

  switch (argvars[0].v_type)
  {
  case VAR_UNKNOWN:
  case VAR_NUMBER:
  case VAR_FLOAT:
  case VAR_SPECIAL:
  case VAR_STRING:
    break;
  case VAR_JOB:
#ifdef FEAT_JOB_CHANNEL
    if (argvars[0].vval.v_job != NULL)
      retval = argvars[0].vval.v_job->jv_refcount - 1;
#endif
    break;
  case VAR_CHANNEL:
#ifdef FEAT_JOB_CHANNEL
    if (argvars[0].vval.v_channel != NULL)
      retval = argvars[0].vval.v_channel->ch_refcount - 1;
#endif
    break;
  case VAR_FUNC:
    if (argvars[0].vval.v_string != NULL)
    {
      ufunc_T *fp;

      fp = find_func(argvars[0].vval.v_string);
      if (fp != NULL)
        retval = fp->uf_refcount;
    }
    break;
  case VAR_PARTIAL:
    if (argvars[0].vval.v_partial != NULL)
      retval = argvars[0].vval.v_partial->pt_refcount - 1;
    break;
  case VAR_BLOB:
    if (argvars[0].vval.v_blob != NULL)
      retval = argvars[0].vval.v_blob->bv_refcount - 1;
    break;
  case VAR_LIST:
    if (argvars[0].vval.v_list != NULL)
      retval = argvars[0].vval.v_list->lv_refcount - 1;
    break;
  case VAR_DICT:
    if (argvars[0].vval.v_dict != NULL)
      retval = argvars[0].vval.v_dict->dv_refcount - 1;
    break;
  }

  rettv->v_type = VAR_NUMBER;
  rettv->vval.v_number = retval;
}

/*
 * "test_garbagecollect_now()" function
 */
static void
f_test_garbagecollect_now(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
  /* This is dangerous, any Lists and Dicts used internally may be freed
     * while still in use. */
  garbage_collect(TRUE);
}

/*
 * "test_ignore_error()" function
 */
static void
f_test_ignore_error(typval_T *argvars, typval_T *rettv UNUSED)
{
  ignore_error_for_testing(tv_get_string(&argvars[0]));
}

static void
f_test_null_blob(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->v_type = VAR_BLOB;
  rettv->vval.v_blob = NULL;
}

#ifdef FEAT_JOB_CHANNEL
static void
f_test_null_channel(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->v_type = VAR_CHANNEL;
  rettv->vval.v_channel = NULL;
}
#endif

static void
f_test_null_dict(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv_dict_set(rettv, NULL);
}

#ifdef FEAT_JOB_CHANNEL
static void
f_test_null_job(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->v_type = VAR_JOB;
  rettv->vval.v_job = NULL;
}
#endif

static void
f_test_null_list(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv_list_set(rettv, NULL);
}

static void
f_test_null_partial(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->v_type = VAR_PARTIAL;
  rettv->vval.v_partial = NULL;
}

static void
f_test_null_string(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;
}

static void
f_test_settime(typval_T *argvars, typval_T *rettv UNUSED)
{
  time_for_testing = (time_t)tv_get_number(&argvars[0]);
}

/*
 * Get a callback from "arg".  It can be a Funcref or a function name.
 * When "arg" is zero return an empty string.
 * "cb_name" is not allocated.
 * "cb_name" is set to NULL for an invalid argument.
 */
callback_T
get_callback(typval_T *arg)
{
  callback_T res;

  res.cb_free_name = FALSE;
  if (arg->v_type == VAR_PARTIAL && arg->vval.v_partial != NULL)
  {
    res.cb_partial = arg->vval.v_partial;
    ++res.cb_partial->pt_refcount;
    res.cb_name = partial_name(res.cb_partial);
  }
  else
  {
    res.cb_partial = NULL;
    if (arg->v_type == VAR_FUNC || arg->v_type == VAR_STRING)
    {
      // Note that we don't make a copy of the string.
      res.cb_name = arg->vval.v_string;
      func_ref(res.cb_name);
    }
    else if (arg->v_type == VAR_NUMBER && arg->vval.v_number == 0)
    {
      res.cb_name = (char_u *)"";
    }
    else
    {
      emsg(_("E921: Invalid callback argument"));
      res.cb_name = NULL;
    }
  }
  return res;
}

/*
 * Copy a callback into a typval_T.
 */
void put_callback(callback_T *cb, typval_T *tv)
{
  if (cb->cb_partial != NULL)
  {
    tv->v_type = VAR_PARTIAL;
    tv->vval.v_partial = cb->cb_partial;
    ++tv->vval.v_partial->pt_refcount;
  }
  else
  {
    tv->v_type = VAR_FUNC;
    tv->vval.v_string = vim_strsave(cb->cb_name);
    func_ref(cb->cb_name);
  }
}

/*
 * Make a copy of "src" into "dest", allocating the function name if needed,
 * without incrementing the refcount.
 */
void set_callback(callback_T *dest, callback_T *src)
{
  if (src->cb_partial == NULL)
  {
    // just a function name, make a copy
    dest->cb_name = vim_strsave(src->cb_name);
    dest->cb_free_name = TRUE;
  }
  else
  {
    // cb_name is a pointer into cb_partial
    dest->cb_name = src->cb_name;
    dest->cb_free_name = FALSE;
  }
  dest->cb_partial = src->cb_partial;
}

/*
 * Unref/free "callback" returned by get_callback() or set_callback().
 */
void free_callback(callback_T *callback)
{
  if (callback->cb_partial != NULL)
  {
    partial_unref(callback->cb_partial);
    callback->cb_partial = NULL;
  }
  else if (callback->cb_name != NULL)
    func_unref(callback->cb_name);
  if (callback->cb_free_name)
  {
    vim_free(callback->cb_name);
    callback->cb_free_name = FALSE;
  }
  callback->cb_name = NULL;
}

#ifdef FEAT_TIMERS
/*
 * "timer_info([timer])" function
 */
static void
f_timer_info(typval_T *argvars, typval_T *rettv)
{
  timer_T *timer = NULL;

  if (rettv_list_alloc(rettv) != OK)
    return;
  if (argvars[0].v_type != VAR_UNKNOWN)
  {
    if (argvars[0].v_type != VAR_NUMBER)
      emsg(_(e_number_exp));
    else
    {
      timer = find_timer((int)tv_get_number(&argvars[0]));
      if (timer != NULL)
        add_timer_info(rettv, timer);
    }
  }
  else
    add_timer_info_all(rettv);
}

/*
 * "timer_pause(timer, paused)" function
 */
static void
f_timer_pause(typval_T *argvars, typval_T *rettv UNUSED)
{
  timer_T *timer = NULL;
  int paused = (int)tv_get_number(&argvars[1]);

  if (argvars[0].v_type != VAR_NUMBER)
    emsg(_(e_number_exp));
  else
  {
    timer = find_timer((int)tv_get_number(&argvars[0]));
    if (timer != NULL)
      timer->tr_paused = paused;
  }
}

/*
 * "timer_start(time, callback [, options])" function
 */
static void
f_timer_start(typval_T *argvars, typval_T *rettv)
{
  long msec = (long)tv_get_number(&argvars[0]);
  timer_T *timer;
  int repeat = 0;
  callback_T callback;
  dict_T *dict;

  rettv->vval.v_number = -1;
  if (check_secure())
    return;
  if (argvars[2].v_type != VAR_UNKNOWN)
  {
    if (argvars[2].v_type != VAR_DICT || (dict = argvars[2].vval.v_dict) == NULL)
    {
      semsg(_(e_invarg2), tv_get_string(&argvars[2]));
      return;
    }
    if (dict_find(dict, (char_u *)"repeat", -1) != NULL)
      repeat = dict_get_number(dict, (char_u *)"repeat");
  }

  callback = get_callback(&argvars[1]);
  if (callback.cb_name == NULL)
    return;

  timer = create_timer(msec, repeat);
  if (timer == NULL)
    free_callback(&callback);
  else
  {
    set_callback(&timer->tr_callback, &callback);
    rettv->vval.v_number = (varnumber_T)timer->tr_id;
  }
}

/*
 * "timer_stop(timer)" function
 */
static void
f_timer_stop(typval_T *argvars, typval_T *rettv UNUSED)
{
  timer_T *timer;

  if (argvars[0].v_type != VAR_NUMBER)
  {
    emsg(_(e_number_exp));
    return;
  }
  timer = find_timer((int)tv_get_number(&argvars[0]));
  if (timer != NULL)
    stop_timer(timer);
}

/*
 * "timer_stopall()" function
 */
static void
f_timer_stopall(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
  stop_all_timers();
}
#endif

/*
 * "tolower(string)" function
 */
static void
f_tolower(typval_T *argvars, typval_T *rettv)
{
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = strlow_save(tv_get_string(&argvars[0]));
}

/*
 * "toupper(string)" function
 */
static void
f_toupper(typval_T *argvars, typval_T *rettv)
{
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = strup_save(tv_get_string(&argvars[0]));
}

/*
 * "tr(string, fromstr, tostr)" function
 */
static void
f_tr(typval_T *argvars, typval_T *rettv)
{
  char_u *in_str;
  char_u *fromstr;
  char_u *tostr;
  char_u *p;
  int inlen;
  int fromlen;
  int tolen;
  int idx;
  char_u *cpstr;
  int cplen;
  int first = TRUE;
  char_u buf[NUMBUFLEN];
  char_u buf2[NUMBUFLEN];
  garray_T ga;

  in_str = tv_get_string(&argvars[0]);
  fromstr = tv_get_string_buf_chk(&argvars[1], buf);
  tostr = tv_get_string_buf_chk(&argvars[2], buf2);

  /* Default return value: empty string. */
  rettv->v_type = VAR_STRING;
  rettv->vval.v_string = NULL;
  if (fromstr == NULL || tostr == NULL)
    return; /* type error; errmsg already given */
  ga_init2(&ga, (int)sizeof(char), 80);

  if (!has_mbyte)
    /* not multi-byte: fromstr and tostr must be the same length */
    if (STRLEN(fromstr) != STRLEN(tostr))
    {
    error:
      semsg(_(e_invarg2), fromstr);
      ga_clear(&ga);
      return;
    }

  /* fromstr and tostr have to contain the same number of chars */
  while (*in_str != NUL)
  {
    if (has_mbyte)
    {
      inlen = (*mb_ptr2len)(in_str);
      cpstr = in_str;
      cplen = inlen;
      idx = 0;
      for (p = fromstr; *p != NUL; p += fromlen)
      {
        fromlen = (*mb_ptr2len)(p);
        if (fromlen == inlen && STRNCMP(in_str, p, inlen) == 0)
        {
          for (p = tostr; *p != NUL; p += tolen)
          {
            tolen = (*mb_ptr2len)(p);
            if (idx-- == 0)
            {
              cplen = tolen;
              cpstr = p;
              break;
            }
          }
          if (*p == NUL) /* tostr is shorter than fromstr */
            goto error;
          break;
        }
        ++idx;
      }

      if (first && cpstr == in_str)
      {
        /* Check that fromstr and tostr have the same number of
		 * (multi-byte) characters.  Done only once when a character
		 * of in_str doesn't appear in fromstr. */
        first = FALSE;
        for (p = tostr; *p != NUL; p += tolen)
        {
          tolen = (*mb_ptr2len)(p);
          --idx;
        }
        if (idx != 0)
          goto error;
      }

      (void)ga_grow(&ga, cplen);
      mch_memmove((char *)ga.ga_data + ga.ga_len, cpstr, (size_t)cplen);
      ga.ga_len += cplen;

      in_str += inlen;
    }
    else
    {
      /* When not using multi-byte chars we can do it faster. */
      p = vim_strchr(fromstr, *in_str);
      if (p != NULL)
        ga_append(&ga, tostr[p - fromstr]);
      else
        ga_append(&ga, *in_str);
      ++in_str;
    }
  }

  /* add a terminating NUL */
  (void)ga_grow(&ga, 1);
  ga_append(&ga, NUL);

  rettv->vval.v_string = ga.ga_data;
}

/*
 * "trim({expr})" function
 */
static void
f_trim(typval_T *argvars, typval_T *rettv)
{
  char_u buf1[NUMBUFLEN];
  char_u buf2[NUMBUFLEN];
  char_u *head = tv_get_string_buf_chk(&argvars[0], buf1);
  char_u *mask = NULL;
  char_u *tail;
  char_u *prev;
  char_u *p;
  int c1;

  rettv->v_type = VAR_STRING;
  if (head == NULL)
  {
    rettv->vval.v_string = NULL;
    return;
  }

  if (argvars[1].v_type == VAR_STRING)
    mask = tv_get_string_buf_chk(&argvars[1], buf2);

  while (*head != NUL)
  {
    c1 = PTR2CHAR(head);
    if (mask == NULL)
    {
      if (c1 > ' ' && c1 != 0xa0)
        break;
    }
    else
    {
      for (p = mask; *p != NUL; MB_PTR_ADV(p))
        if (c1 == PTR2CHAR(p))
          break;
      if (*p == NUL)
        break;
    }
    MB_PTR_ADV(head);
  }

  for (tail = head + STRLEN(head); tail > head; tail = prev)
  {
    prev = tail;
    MB_PTR_BACK(head, prev);
    c1 = PTR2CHAR(prev);
    if (mask == NULL)
    {
      if (c1 > ' ' && c1 != 0xa0)
        break;
    }
    else
    {
      for (p = mask; *p != NUL; MB_PTR_ADV(p))
        if (c1 == PTR2CHAR(p))
          break;
      if (*p == NUL)
        break;
    }
  }
  rettv->vval.v_string = vim_strnsave(head, (int)(tail - head));
}

#ifdef FEAT_FLOAT
/*
 * "trunc({float})" function
 */
static void
f_trunc(typval_T *argvars, typval_T *rettv)
{
  float_T f = 0.0;

  rettv->v_type = VAR_FLOAT;
  if (get_float_arg(argvars, &f) == OK)
    /* trunc() is not in C90, use floor() or ceil() instead. */
    rettv->vval.v_float = f > 0 ? floor(f) : ceil(f);
  else
    rettv->vval.v_float = 0.0;
}
#endif

/*
 * "type(expr)" function
 */
static void
f_type(typval_T *argvars, typval_T *rettv)
{
  int n = -1;

  switch (argvars[0].v_type)
  {
  case VAR_NUMBER:
    n = VAR_TYPE_NUMBER;
    break;
  case VAR_STRING:
    n = VAR_TYPE_STRING;
    break;
  case VAR_PARTIAL:
  case VAR_FUNC:
    n = VAR_TYPE_FUNC;
    break;
  case VAR_LIST:
    n = VAR_TYPE_LIST;
    break;
  case VAR_DICT:
    n = VAR_TYPE_DICT;
    break;
  case VAR_FLOAT:
    n = VAR_TYPE_FLOAT;
    break;
  case VAR_SPECIAL:
    if (argvars[0].vval.v_number == VVAL_FALSE || argvars[0].vval.v_number == VVAL_TRUE)
      n = VAR_TYPE_BOOL;
    else
      n = VAR_TYPE_NONE;
    break;
  case VAR_JOB:
    n = VAR_TYPE_JOB;
    break;
  case VAR_CHANNEL:
    n = VAR_TYPE_CHANNEL;
    break;
  case VAR_BLOB:
    n = VAR_TYPE_BLOB;
    break;
  case VAR_UNKNOWN:
    internal_error("f_type(UNKNOWN)");
    n = -1;
    break;
  }
  rettv->vval.v_number = n;
}

/*
 * "undofile(name)" function
 */
static void
f_undofile(typval_T *argvars UNUSED, typval_T *rettv)
{
  rettv->v_type = VAR_STRING;
#ifdef FEAT_PERSISTENT_UNDO
  {
    char_u *fname = tv_get_string(&argvars[0]);

    if (*fname == NUL)
    {
      /* If there is no file name there will be no undo file. */
      rettv->vval.v_string = NULL;
    }
    else
    {
      char_u *ffname = FullName_save(fname, TRUE);

      if (ffname != NULL)
        rettv->vval.v_string = u_get_undo_file_name(ffname, FALSE);
      vim_free(ffname);
    }
  }
#else
  rettv->vval.v_string = NULL;
#endif
}

/*
 * "undotree()" function
 */
static void
f_undotree(typval_T *argvars UNUSED, typval_T *rettv)
{
  if (rettv_dict_alloc(rettv) == OK)
  {
    dict_T *dict = rettv->vval.v_dict;
    list_T *list;

    dict_add_number(dict, "synced", (long)curbuf->b_u_synced);
    dict_add_number(dict, "seq_last", curbuf->b_u_seq_last);
    dict_add_number(dict, "save_last", (long)curbuf->b_u_save_nr_last);
    dict_add_number(dict, "seq_cur", curbuf->b_u_seq_cur);
    dict_add_number(dict, "time_cur", (long)curbuf->b_u_time_cur);
    dict_add_number(dict, "save_cur", (long)curbuf->b_u_save_nr_cur);

    list = list_alloc();
    if (list != NULL)
    {
      u_eval_tree(curbuf->b_u_oldhead, list);
      dict_add_list(dict, "entries", list);
    }
  }
}

/*
 * "values(dict)" function
 */
static void
f_values(typval_T *argvars, typval_T *rettv)
{
  dict_list(argvars, rettv, 1);
}

/*
 * "virtcol(string)" function
 */
static void
f_virtcol(typval_T *argvars, typval_T *rettv)
{
  colnr_T vcol = 0;
  pos_T *fp;
  int fnum = curbuf->b_fnum;

  fp = var2fpos(&argvars[0], FALSE, &fnum);
  if (fp != NULL && fp->lnum <= curbuf->b_ml.ml_line_count && fnum == curbuf->b_fnum)
  {
    getvvcol(curwin, fp, NULL, NULL, &vcol);
    ++vcol;
  }

  rettv->vval.v_number = vcol;
}

/*
 * "visualmode()" function
 */
static void
f_visualmode(typval_T *argvars, typval_T *rettv)
{
  char_u str[2];

  rettv->v_type = VAR_STRING;
  str[0] = curbuf->b_visual_mode_eval;
  str[1] = NUL;
  rettv->vval.v_string = vim_strsave(str);

  /* A non-zero number or non-empty string argument: reset mode. */
  if (non_zero_arg(&argvars[0]))
    curbuf->b_visual_mode_eval = NUL;
}

/*
 * "wildmenumode()" function
 */
static void
f_wildmenumode(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_WILDMENU
  if (wild_menu_showing)
    rettv->vval.v_number = 1;
#endif
}

/*
 * "winbufnr(nr)" function
 */
static void
f_winbufnr(typval_T *argvars, typval_T *rettv)
{
  win_T *wp;

  wp = find_win_by_nr_or_id(&argvars[0]);
  if (wp == NULL)
    rettv->vval.v_number = -1;
  else
    rettv->vval.v_number = wp->w_buffer->b_fnum;
}

/*
 * "wincol()" function
 */
static void
f_wincol(typval_T *argvars UNUSED, typval_T *rettv)
{
  validate_cursor();
  rettv->vval.v_number = curwin->w_wcol + 1;
}

/*
 * "winheight(nr)" function
 */
static void
f_winheight(typval_T *argvars, typval_T *rettv)
{
  win_T *wp;

  wp = find_win_by_nr_or_id(&argvars[0]);
  if (wp == NULL)
    rettv->vval.v_number = -1;
  else
    rettv->vval.v_number = wp->w_height;
}

/*
 * "winlayout()" function
 */
static void
f_winlayout(typval_T *argvars, typval_T *rettv)
{
  tabpage_T *tp;

  if (rettv_list_alloc(rettv) != OK)
    return;

  if (argvars[0].v_type == VAR_UNKNOWN)
    tp = curtab;
  else
  {
    tp = find_tabpage((int)tv_get_number(&argvars[0]));
    if (tp == NULL)
      return;
  }

  get_framelayout(tp->tp_topframe, rettv->vval.v_list, TRUE);
}

/*
 * "winline()" function
 */
static void
f_winline(typval_T *argvars UNUSED, typval_T *rettv)
{
  validate_cursor();
  rettv->vval.v_number = curwin->w_wrow + 1;
}

/*
 * "winnr()" function
 */
static void
f_winnr(typval_T *argvars UNUSED, typval_T *rettv)
{
  int nr = 1;

  nr = get_winnr(curtab, &argvars[0]);
  rettv->vval.v_number = nr;
}

/*
 * "winrestcmd()" function
 */
static void
f_winrestcmd(typval_T *argvars UNUSED, typval_T *rettv)
{
  win_T *wp;
  int winnr = 1;
  garray_T ga;
  char_u buf[50];

  ga_init2(&ga, (int)sizeof(char), 70);
  FOR_ALL_WINDOWS(wp)
  {
    sprintf((char *)buf, "%dresize %d|", winnr, wp->w_height);
    ga_concat(&ga, buf);
    sprintf((char *)buf, "vert %dresize %d|", winnr, wp->w_width);
    ga_concat(&ga, buf);
    ++winnr;
  }
  ga_append(&ga, NUL);

  rettv->vval.v_string = ga.ga_data;
  rettv->v_type = VAR_STRING;
}

/*
 * "winrestview()" function
 */
static void
f_winrestview(typval_T *argvars, typval_T *rettv UNUSED)
{
  dict_T *dict;

  if (argvars[0].v_type != VAR_DICT || (dict = argvars[0].vval.v_dict) == NULL)
    emsg(_(e_invarg));
  else
  {
    if (dict_find(dict, (char_u *)"lnum", -1) != NULL)
      curwin->w_cursor.lnum = (linenr_T)dict_get_number(dict, (char_u *)"lnum");
    if (dict_find(dict, (char_u *)"col", -1) != NULL)
      curwin->w_cursor.col = (colnr_T)dict_get_number(dict, (char_u *)"col");
    if (dict_find(dict, (char_u *)"coladd", -1) != NULL)
      curwin->w_cursor.coladd = (colnr_T)dict_get_number(dict, (char_u *)"coladd");
    if (dict_find(dict, (char_u *)"curswant", -1) != NULL)
    {
      curwin->w_curswant = (colnr_T)dict_get_number(dict, (char_u *)"curswant");
      curwin->w_set_curswant = FALSE;
    }

    if (dict_find(dict, (char_u *)"topline", -1) != NULL)
      set_topline(curwin, (linenr_T)dict_get_number(dict, (char_u *)"topline"));
#ifdef FEAT_DIFF
    if (dict_find(dict, (char_u *)"topfill", -1) != NULL)
      curwin->w_topfill = (int)dict_get_number(dict, (char_u *)"topfill");
#endif
    if (dict_find(dict, (char_u *)"leftcol", -1) != NULL)
      curwin->w_leftcol = (colnr_T)dict_get_number(dict, (char_u *)"leftcol");
    if (dict_find(dict, (char_u *)"skipcol", -1) != NULL)
      curwin->w_skipcol = (colnr_T)dict_get_number(dict, (char_u *)"skipcol");

    check_cursor();
    win_new_height(curwin, curwin->w_height);
    win_new_width(curwin, curwin->w_width);
    changed_window_setting();

    if (curwin->w_topline <= 0)
      curwin->w_topline = 1;
    if (curwin->w_topline > curbuf->b_ml.ml_line_count)
      curwin->w_topline = curbuf->b_ml.ml_line_count;
#ifdef FEAT_DIFF
    check_topfill(curwin, TRUE);
#endif
  }
}

/*
 * "winsaveview()" function
 */
static void
f_winsaveview(typval_T *argvars UNUSED, typval_T *rettv)
{
  dict_T *dict;

  if (rettv_dict_alloc(rettv) == FAIL)
    return;
  dict = rettv->vval.v_dict;

  dict_add_number(dict, "lnum", (long)curwin->w_cursor.lnum);
  dict_add_number(dict, "col", (long)curwin->w_cursor.col);
  dict_add_number(dict, "coladd", (long)curwin->w_cursor.coladd);
  update_curswant();
  dict_add_number(dict, "curswant", (long)curwin->w_curswant);

  dict_add_number(dict, "topline", (long)curwin->w_topline);
#ifdef FEAT_DIFF
  dict_add_number(dict, "topfill", (long)curwin->w_topfill);
#endif
  dict_add_number(dict, "leftcol", (long)curwin->w_leftcol);
  dict_add_number(dict, "skipcol", (long)curwin->w_skipcol);
}

/*
 * "winwidth(nr)" function
 */
static void
f_winwidth(typval_T *argvars, typval_T *rettv)
{
  win_T *wp;

  wp = find_win_by_nr_or_id(&argvars[0]);
  if (wp == NULL)
    rettv->vval.v_number = -1;
  else
    rettv->vval.v_number = wp->w_width;
}

/*
 * "wordcount()" function
 */
static void
f_wordcount(typval_T *argvars UNUSED, typval_T *rettv)
{
  if (rettv_dict_alloc(rettv) == FAIL)
    return;
  cursor_pos_info(rettv->vval.v_dict);
}

/*
 * "writefile()" function
 */
static void
f_writefile(typval_T *argvars, typval_T *rettv)
{
  int binary = FALSE;
  int append = FALSE;
#ifdef HAVE_FSYNC
  int do_fsync = p_fs;
#endif
  char_u *fname;
  FILE *fd;
  int ret = 0;
  listitem_T *li;
  list_T *list = NULL;
  blob_T *blob = NULL;

  rettv->vval.v_number = -1;
  if (check_secure())
    return;

  if (argvars[0].v_type == VAR_LIST)
  {
    list = argvars[0].vval.v_list;
    if (list == NULL)
      return;
    for (li = list->lv_first; li != NULL; li = li->li_next)
      if (tv_get_string_chk(&li->li_tv) == NULL)
        return;
  }
  else if (argvars[0].v_type == VAR_BLOB)
  {
    blob = argvars[0].vval.v_blob;
    if (blob == NULL)
      return;
  }
  else
  {
    semsg(_(e_invarg2), "writefile()");
    return;
  }

  if (argvars[2].v_type != VAR_UNKNOWN)
  {
    char_u *arg2 = tv_get_string_chk(&argvars[2]);

    if (arg2 == NULL)
      return;
    if (vim_strchr(arg2, 'b') != NULL)
      binary = TRUE;
    if (vim_strchr(arg2, 'a') != NULL)
      append = TRUE;
#ifdef HAVE_FSYNC
    if (vim_strchr(arg2, 's') != NULL)
      do_fsync = TRUE;
    else if (vim_strchr(arg2, 'S') != NULL)
      do_fsync = FALSE;
#endif
  }

  fname = tv_get_string_chk(&argvars[1]);
  if (fname == NULL)
    return;

  /* Always open the file in binary mode, library functions have a mind of
     * their own about CR-LF conversion. */
  if (*fname == NUL || (fd = mch_fopen((char *)fname,
                                       append ? APPENDBIN : WRITEBIN)) == NULL)
  {
    semsg(_(e_notcreate), *fname == NUL ? (char_u *)_("<empty>") : fname);
    ret = -1;
  }
  else if (blob)
  {
    if (write_blob(fd, blob) == FAIL)
      ret = -1;
#ifdef HAVE_FSYNC
    else if (do_fsync)
      // Ignore the error, the user wouldn't know what to do about it.
      // May happen for a device.
      vim_ignored = vim_fsync(fileno(fd));
#endif
    fclose(fd);
  }
  else
  {
    if (write_list(fd, list, binary) == FAIL)
      ret = -1;
#ifdef HAVE_FSYNC
    else if (do_fsync)
      /* Ignore the error, the user wouldn't know what to do about it.
	     * May happen for a device. */
      vim_ignored = vim_fsync(fileno(fd));
#endif
    fclose(fd);
  }

  rettv->vval.v_number = ret;
}

/*
 * "xor(expr, expr)" function
 */
static void
f_xor(typval_T *argvars, typval_T *rettv)
{
  rettv->vval.v_number = tv_get_number_chk(&argvars[0], NULL) ^ tv_get_number_chk(&argvars[1], NULL);
}

#endif /* FEAT_EVAL */
