/* 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.
 */

/*
 * ops.c: implementation of various operators: op_shift, op_delete, op_tilde,
 *	  op_change, op_yank, do_put, do_join
 */

#include "vim.h"

/*
 * Number of registers.
 *	0 = unnamed register, for normal yanks and puts
 *   1..9 = registers '1' to '9', for deletes
 * 10..35 = registers 'a' to 'z'
 *     36 = delete register '-'
 *     37 = Selection register '*'.
 *     38 = Clipboard register '+'.
 */
/*
 * Symbolic names for some registers.
 */
#define DELETION_REGISTER 36
#define STAR_REGISTER 37
#define PLUS_REGISTER 38

#define NUM_REGISTERS (PLUS_REGISTER + 1)

/*
 * Each yank register has an array of pointers to lines.
 */
typedef struct
{
  char_u **y_array; /* pointer to array of line pointers */
  linenr_T y_size;  /* number of lines in y_array */
  char_u y_type;    /* MLINE, MCHAR or MBLOCK */
  colnr_T y_width;  /* only set if y_type == MBLOCK */
#ifdef FEAT_VIMINFO
  time_t y_time_set;
#endif
} yankreg_T;

static yankreg_T y_regs[NUM_REGISTERS];

static yankreg_T *y_current;         /* ptr to current yankreg */
static int y_append;                 /* TRUE when appending */
static yankreg_T *y_previous = NULL; /* ptr to last written yankreg */

/*
 * structure used by block_prep, op_delete and op_yank for blockwise operators
 * also op_change, op_shift, op_insert, op_replace - AKelly
 */
struct block_def
{
  int startspaces;          /* 'extra' cols before first char */
  int endspaces;            /* 'extra' cols after last char */
  int textlen;              /* chars in block */
  char_u *textstart;        /* pointer to 1st char (partially) in block */
  colnr_T textcol;          /* index of chars (partially) in block */
  colnr_T start_vcol;       /* start col of 1st char wholly inside block */
  colnr_T end_vcol;         /* start col of 1st char wholly after block */
  int is_short;             /* TRUE if line is too short to fit in block */
  int is_MAX;               /* TRUE if curswant==MAXCOL when starting */
  int is_oneChar;           /* TRUE if block within one character */
  int pre_whitesp;          /* screen cols of ws before block */
  int pre_whitesp_c;        /* chars of ws before block */
  colnr_T end_char_vcols;   /* number of vcols of post-block char */
  colnr_T start_char_vcols; /* number of vcols of pre-block char */
};

static void shift_block(oparg_T *oap, int amount);
static int stuff_yank(int, char_u *);
static void put_reedit_in_typebuf(int silent);
static int put_in_typebuf(char_u *s, int esc, int colon, int silent);
static void stuffescaped(char_u *arg, int literally);
static void mb_adjust_opend(oparg_T *oap);
static void free_yank_all(void);
static int yank_copy_line(struct block_def *bd, long y_idx);
static void dis_msg(char_u *p, int skip_esc);
static void block_prep(oparg_T *oap, struct block_def *, linenr_T, int);
static int do_addsub(int op_type, pos_T *pos, int length, linenr_T Prenum1);
static void str_to_reg(yankreg_T *y_ptr, int yank_type, char_u *str, long len,
                       long blocklen, int str_list);
static int ends_in_white(linenr_T lnum);
#ifdef FEAT_COMMENTS
static int fmt_check_par(linenr_T, int *, char_u **, int do_comments);
#else
static int fmt_check_par(linenr_T);
#endif

// Flags for third item in "opchars".
#define OPF_LINES 1  // operator always works on lines
#define OPF_CHANGE 2 // operator changes text

/*
 * The names of operators.
 * IMPORTANT: Index must correspond with defines in vim.h!!!
 * The third field holds OPF_ flags.
 */
static char opchars[][3] = {
    {NUL, NUL, 0},                      // OP_NOP
    {'d', NUL, OPF_CHANGE},             // OP_DELETE
    {'y', NUL, 0},                      // OP_YANK
    {'c', NUL, OPF_CHANGE},             // OP_CHANGE
    {'<', NUL, OPF_LINES | OPF_CHANGE}, // OP_LSHIFT
    {'>', NUL, OPF_LINES | OPF_CHANGE}, // OP_RSHIFT
    {'!', NUL, OPF_LINES | OPF_CHANGE}, // OP_FILTER
    {'g', '~', OPF_CHANGE},             // OP_TILDE
    {'=', NUL, OPF_LINES | OPF_CHANGE}, // OP_INDENT
    {'g', 'q', OPF_LINES | OPF_CHANGE}, // OP_FORMAT
    {':', NUL, OPF_LINES},              // OP_COLON
    {'g', 'U', OPF_CHANGE},             // OP_UPPER
    {'g', 'u', OPF_CHANGE},             // OP_LOWER
    {'J', NUL, OPF_LINES | OPF_CHANGE}, // DO_JOIN
    {'g', 'J', OPF_LINES | OPF_CHANGE}, // DO_JOIN_NS
    {'g', '?', OPF_CHANGE},             // OP_ROT13
    {'r', NUL, OPF_CHANGE},             // OP_REPLACE
    {'I', NUL, OPF_CHANGE},             // OP_INSERT
    {'A', NUL, OPF_CHANGE},             // OP_APPEND
    {'z', 'f', OPF_LINES},              // OP_FOLD
    {'z', 'o', OPF_LINES},              // OP_FOLDOPEN
    {'z', 'O', OPF_LINES},              // OP_FOLDOPENREC
    {'z', 'c', OPF_LINES},              // OP_FOLDCLOSE
    {'z', 'C', OPF_LINES},              // OP_FOLDCLOSEREC
    {'z', 'd', OPF_LINES},              // OP_FOLDDEL
    {'z', 'D', OPF_LINES},              // OP_FOLDDELREC
    {'g', 'w', OPF_LINES | OPF_CHANGE}, // OP_FORMAT2
    {'g', '@', OPF_CHANGE},             // OP_FUNCTION
    {Ctrl_A, NUL, OPF_CHANGE},          // OP_NR_ADD
    {Ctrl_X, NUL, OPF_CHANGE},          // OP_NR_SUB
    {'g', 'c', OPF_LINES | OPF_CHANGE}, // OP_COMMENT
};

/*
 * Translate a command name into an operator type.
 * Must only be called with a valid operator name!
 */
int get_op_type(int char1, int char2)
{
  int i;

  if (char1 == 'r') /* ignore second character */
    return OP_REPLACE;
  if (char1 == '~') /* when tilde is an operator */
    return OP_TILDE;
  if (char1 == 'g' && char2 == Ctrl_A) /* add */
    return OP_NR_ADD;
  if (char1 == 'g' && char2 == Ctrl_X) /* subtract */
    return OP_NR_SUB;
  for (i = 0;; ++i)
  {
    if (opchars[i][0] == char1 && opchars[i][1] == char2)
      break;
    if (i == (int)(sizeof(opchars) / sizeof(char[3]) - 1))
    {
      internal_error("get_op_type()");
      break;
    }
  }
  return i;
}

/*
 * Return TRUE if operator "op" always works on whole lines.
 */
int op_on_lines(int op) { return opchars[op][2] & OPF_LINES; }

#if defined(FEAT_JOB_CHANNEL) || defined(PROTO)
/*
 * Return TRUE if operator "op" changes text.
 */
int op_is_change(int op) { return opchars[op][2] & OPF_CHANGE; }
#endif

/*
 * Get first operator command character.
 * Returns 'g' or 'z' if there is another command character.
 */
int get_op_char(int optype) { return opchars[optype][0]; }

/*
 * Get second operator command character.
 */
int get_extra_op_char(int optype) { return opchars[optype][1]; }

/*
 * op_shift - handle a shift operation
 */
void op_shift(oparg_T *oap, int curs_top, int amount)
{
  long i;
  int first_char;
  int block_col = 0;

  if (u_save((linenr_T)(oap->start.lnum - 1), (linenr_T)(oap->end.lnum + 1)) ==
      FAIL)
    return;

  if (oap->block_mode)
    block_col = curwin->w_cursor.col;

  for (i = oap->line_count; --i >= 0;)
  {
    first_char = *ml_get_curline();
    if (first_char == NUL) /* empty line */
      curwin->w_cursor.col = 0;
    else if (oap->block_mode)
      shift_block(oap, amount);
    else
    /* Move the line right if it doesn't start with '#', 'smartindent'
     * isn't set or 'cindent' isn't set or '#' isn't in 'cino'. */
#if defined(FEAT_SMARTINDENT)
        if (first_char != '#' || !preprocs_left())
#endif
      shift_line(oap->op_type == OP_LSHIFT, p_sr, amount, FALSE);
    ++curwin->w_cursor.lnum;
  }

  changed_lines(oap->start.lnum, 0, oap->end.lnum + 1, 0L);
  if (oap->block_mode)
  {
    curwin->w_cursor.lnum = oap->start.lnum;
    curwin->w_cursor.col = block_col;
  }
  else if (curs_top) /* put cursor on first line, for ">>" */
  {
    curwin->w_cursor.lnum = oap->start.lnum;
    beginline(BL_SOL | BL_FIX); /* shift_line() may have set cursor.col */
  }
  else
    --curwin->w_cursor.lnum; /* put cursor on last line, for ":>" */

#ifdef FEAT_FOLDING
  /* The cursor line is not in a closed fold */
  foldOpenCursor();
#endif

  if (oap->line_count > p_report)
  {
    char *op;
    char *msg_line_single;
    char *msg_line_plural;

    if (oap->op_type == OP_RSHIFT)
      op = ">";
    else
      op = "<";
    msg_line_single =
        NGETTEXT("%ld line %sed %d time", "%ld line %sed %d times", amount);
    msg_line_plural =
        NGETTEXT("%ld lines %sed %d time", "%ld lines %sed %d times", amount);
    vim_snprintf((char *)IObuff, IOSIZE,
                 NGETTEXT(msg_line_single, msg_line_plural, oap->line_count),
                 oap->line_count, op, amount);
    msg((char *)IObuff);
  }

  /*
   * Set "'[" and "']" marks.
   */
  curbuf->b_op_start = oap->start;
  curbuf->b_op_end.lnum = oap->end.lnum;
  curbuf->b_op_end.col = (colnr_T)STRLEN(ml_get(oap->end.lnum));
  if (curbuf->b_op_end.col > 0)
    --curbuf->b_op_end.col;
}

/*
 * Shift the current line one shiftwidth left (if left != 0) or right
 * leaves cursor on first blank in the line.
 */
void shift_line(int left, int round, int amount,
                int call_changed_bytes) /* call changed_bytes() */
{
  int count;
  int i, j;
  int p_sw = (int)get_sw_value_indent(curbuf);

  count = get_indent(); /* get current indent */

  if (round) /* round off indent */
  {
    i = count / p_sw; /* number of p_sw rounded down */
    j = count % p_sw; /* extra spaces */
    if (j && left)    /* first remove extra spaces */
      --amount;
    if (left)
    {
      i -= amount;
      if (i < 0)
        i = 0;
    }
    else
      i += amount;
    count = i * p_sw;
  }
  else /* original vi indent */
  {
    if (left)
    {
      count -= p_sw * amount;
      if (count < 0)
        count = 0;
    }
    else
      count += p_sw * amount;
  }

  /* Set new indent */
  if (State & VREPLACE_FLAG)
    change_indent(INDENT_SET, count, FALSE, NUL, call_changed_bytes);
  else
    (void)set_indent(count, call_changed_bytes ? SIN_CHANGED : 0);
}

/*
 * Shift one line of the current block one shiftwidth right or left.
 * Leaves cursor on first character in block.
 */
static void shift_block(oparg_T *oap, int amount)
{
  int left = (oap->op_type == OP_LSHIFT);
  int oldstate = State;
  int total;
  char_u *newp, *oldp;
  int oldcol = curwin->w_cursor.col;
  int p_sw = (int)get_sw_value_indent(curbuf);
#ifdef FEAT_VARTABS
  int *p_vts = curbuf->b_p_vts_array;
#endif
  int p_ts = (int)curbuf->b_p_ts;
  struct block_def bd;
  int incr;
  colnr_T ws_vcol;
  int i = 0, j = 0;
  int len;
#ifdef FEAT_RIGHTLEFT
  int old_p_ri = p_ri;

  p_ri = 0; /* don't want revins in indent */
#endif

  State = INSERT; /* don't want REPLACE for State */
  block_prep(oap, &bd, curwin->w_cursor.lnum, TRUE);
  if (bd.is_short)
    return;

  /* total is number of screen columns to be inserted/removed */
  total = (int)((unsigned)amount * (unsigned)p_sw);
  if ((total / p_sw) != amount)
    return; /* multiplication overflow */

  oldp = ml_get_curline();

  if (!left)
  {
    /*
     *  1. Get start vcol
     *  2. Total ws vcols
     *  3. Divvy into TABs & spp
     *  4. Construct new string
     */
    total += bd.pre_whitesp; /* all virtual WS upto & incl a split TAB */
    ws_vcol = bd.start_vcol - bd.pre_whitesp;
    if (bd.startspaces)
    {
      if (has_mbyte)
      {
        if ((*mb_ptr2len)(bd.textstart) == 1)
          ++bd.textstart;
        else
        {
          ws_vcol = 0;
          bd.startspaces = 0;
        }
      }
      else
        ++bd.textstart;
    }
    for (; VIM_ISWHITE(*bd.textstart);)
    {
      /* TODO: is passing bd.textstart for start of the line OK? */
      incr = lbr_chartabsize_adv(bd.textstart, &bd.textstart,
                                 (colnr_T)(bd.start_vcol));
      total += incr;
      bd.start_vcol += incr;
    }
    /* OK, now total=all the VWS reqd, and textstart points at the 1st
     * non-ws char in the block. */
#ifdef FEAT_VARTABS
    if (!curbuf->b_p_et)
      tabstop_fromto(ws_vcol, ws_vcol + total, p_ts, p_vts, &i, &j);
    else
      j = total;
#else
    if (!curbuf->b_p_et)
      i = ((ws_vcol % p_ts) + total) / p_ts; /* number of tabs */
    if (i)
      j = ((ws_vcol % p_ts) + total) % p_ts; /* number of spp */
    else
      j = total;
#endif
    /* if we're splitting a TAB, allow for it */
    bd.textcol -= bd.pre_whitesp_c - (bd.startspaces != 0);
    len = (int)STRLEN(bd.textstart) + 1;
    newp = alloc(bd.textcol + i + j + len);
    if (newp == NULL)
      return;
    vim_memset(newp, NUL, (size_t)(bd.textcol + i + j + len));
    mch_memmove(newp, oldp, (size_t)bd.textcol);
    vim_memset(newp + bd.textcol, TAB, (size_t)i);
    vim_memset(newp + bd.textcol + i, ' ', (size_t)j);
    /* the end */
    mch_memmove(newp + bd.textcol + i + j, bd.textstart, (size_t)len);
  }
  else /* left */
  {
    colnr_T destination_col;     /* column to which text in block will
                                    be shifted */
    char_u *verbatim_copy_end;   /* end of the part of the line which is
                                    copied verbatim */
    colnr_T verbatim_copy_width; /* the (displayed) width of this part
                                    of line */
    unsigned fill;               /* nr of spaces that replace a TAB */
    unsigned new_line_len;       /* the length of the line after the
                                    block shift */
    size_t block_space_width;
    size_t shift_amount;
    char_u *non_white = bd.textstart;
    colnr_T non_white_col;

    /*
     * Firstly, let's find the first non-whitespace character that is
     * displayed after the block's start column and the character's column
     * number. Also, let's calculate the width of all the whitespace
     * characters that are displayed in the block and precede the searched
     * non-whitespace character.
     */

    /* If "bd.startspaces" is set, "bd.textstart" points to the character,
     * the part of which is displayed at the block's beginning. Let's start
     * searching from the next character. */
    if (bd.startspaces)
      MB_PTR_ADV(non_white);

    /* The character's column is in "bd.start_vcol".  */
    non_white_col = bd.start_vcol;

    while (VIM_ISWHITE(*non_white))
    {
      incr = lbr_chartabsize_adv(bd.textstart, &non_white, non_white_col);
      non_white_col += incr;
    }

    block_space_width = non_white_col - oap->start_vcol;
    /* We will shift by "total" or "block_space_width", whichever is less.
     */
    shift_amount =
        (block_space_width < (size_t)total ? block_space_width : (size_t)total);

    /* The column to which we will shift the text.  */
    destination_col = (colnr_T)(non_white_col - shift_amount);

    /* Now let's find out how much of the beginning of the line we can
     * reuse without modification.  */
    verbatim_copy_end = bd.textstart;
    verbatim_copy_width = bd.start_vcol;

    /* If "bd.startspaces" is set, "bd.textstart" points to the character
     * preceding the block. We have to subtract its width to obtain its
     * column number.  */
    if (bd.startspaces)
      verbatim_copy_width -= bd.start_char_vcols;
    while (verbatim_copy_width < destination_col)
    {
      char_u *line = verbatim_copy_end;

      /* TODO: is passing verbatim_copy_end for start of the line OK? */
      incr = lbr_chartabsize(line, verbatim_copy_end, verbatim_copy_width);
      if (verbatim_copy_width + incr > destination_col)
        break;
      verbatim_copy_width += incr;
      MB_PTR_ADV(verbatim_copy_end);
    }

    /* If "destination_col" is different from the width of the initial
     * part of the line that will be copied, it means we encountered a tab
     * character, which we will have to partly replace with spaces.  */
    fill = destination_col - verbatim_copy_width;

    /* The replacement line will consist of:
     * - the beginning of the original line up to "verbatim_copy_end",
     * - "fill" number of spaces,
     * - the rest of the line, pointed to by non_white.  */
    new_line_len = (unsigned)(verbatim_copy_end - oldp) + fill +
                   (unsigned)STRLEN(non_white) + 1;

    newp = alloc(new_line_len);
    if (newp == NULL)
      return;
    mch_memmove(newp, oldp, (size_t)(verbatim_copy_end - oldp));
    vim_memset(newp + (verbatim_copy_end - oldp), ' ', (size_t)fill);
    STRMOVE(newp + (verbatim_copy_end - oldp) + fill, non_white);
  }
  /* replace the line */
  ml_replace(curwin->w_cursor.lnum, newp, FALSE);
  changed_bytes(curwin->w_cursor.lnum, (colnr_T)bd.textcol);
  State = oldstate;
  curwin->w_cursor.col = oldcol;
#ifdef FEAT_RIGHTLEFT
  p_ri = old_p_ri;
#endif
}

/*
 * Insert string "s" (b_insert ? before : after) block :AKelly
 * Caller must prepare for undo.
 */
static void block_insert(oparg_T *oap, char_u *s, int b_insert,
                         struct block_def *bdp)
{
  int p_ts;
  int count = 0;       /* extra spaces to replace a cut TAB */
  int spaces = 0;      /* non-zero if cutting a TAB */
  colnr_T offset;      /* pointer along new line */
  unsigned s_len;      /* STRLEN(s) */
  char_u *newp, *oldp; /* new, old lines */
  linenr_T lnum;       /* loop var */
  int oldstate = State;

  State = INSERT; /* don't want REPLACE for State */
  s_len = (unsigned)STRLEN(s);

  for (lnum = oap->start.lnum + 1; lnum <= oap->end.lnum; lnum++)
  {
    block_prep(oap, bdp, lnum, TRUE);
    if (bdp->is_short && b_insert)
      continue; /* OP_INSERT, line ends before block start */

    oldp = ml_get(lnum);

    if (b_insert)
    {
      p_ts = bdp->start_char_vcols;
      spaces = bdp->startspaces;
      if (spaces != 0)
        count = p_ts - 1; /* we're cutting a TAB */
      offset = bdp->textcol;
    }
    else /* append */
    {
      p_ts = bdp->end_char_vcols;
      if (!bdp->is_short) /* spaces = padding after block */
      {
        spaces = (bdp->endspaces ? p_ts - bdp->endspaces : 0);
        if (spaces != 0)
          count = p_ts - 1; /* we're cutting a TAB */
        offset = bdp->textcol + bdp->textlen - (spaces != 0);
      }
      else /* spaces = padding to block edge */
      {
        /* if $ used, just append to EOL (ie spaces==0) */
        if (!bdp->is_MAX)
          spaces = (oap->end_vcol - bdp->end_vcol) + 1;
        count = spaces;
        offset = bdp->textcol + bdp->textlen;
      }
    }

    if (has_mbyte && spaces > 0)
    {
      int off;

      /* Avoid starting halfway a multi-byte character. */
      if (b_insert)
      {
        off = (*mb_head_off)(oldp, oldp + offset + spaces);
      }
      else
      {
        off = (*mb_off_next)(oldp, oldp + offset);
        offset += off;
      }
      spaces -= off;
      count -= off;
    }

    newp = alloc(STRLEN(oldp) + s_len + count + 1);
    if (newp == NULL)
      continue;

    /* copy up to shifted part */
    mch_memmove(newp, oldp, (size_t)(offset));
    oldp += offset;

    /* insert pre-padding */
    vim_memset(newp + offset, ' ', (size_t)spaces);

    /* copy the new text */
    mch_memmove(newp + offset + spaces, s, (size_t)s_len);
    offset += s_len;

    if (spaces && !bdp->is_short)
    {
      /* insert post-padding */
      vim_memset(newp + offset + spaces, ' ', (size_t)(p_ts - spaces));
      /* We're splitting a TAB, don't copy it. */
      oldp++;
      /* We allowed for that TAB, remember this now */
      count++;
    }

    if (spaces > 0)
      offset += count;
    STRMOVE(newp + offset, oldp);

    ml_replace(lnum, newp, FALSE);

    if (lnum == oap->end.lnum)
    {
      /* Set "']" mark to the end of the block instead of the end of
       * the insert in the first line.  */
      curbuf->b_op_end.lnum = oap->end.lnum;
      curbuf->b_op_end.col = offset;
    }
  } /* for all lnum */

  changed_lines(oap->start.lnum + 1, 0, oap->end.lnum + 1, 0L);

  State = oldstate;
}

#if defined(FEAT_EVAL) || defined(PROTO)
/*
 * Keep the last expression line here, for repeating.
 */
static char_u *expr_line = NULL;

/*
 * Get an expression for the "\"=expr1" or "CTRL-R =expr1"
 * Returns '=' when OK, NUL otherwise.
 */
int get_expr_register(void)
{
  char_u *new_line;

  new_line = getcmdline('=', 0L, 0);
  if (new_line == NULL)
    return NUL;
  if (*new_line == NUL) /* use previous line */
    vim_free(new_line);
  else
    set_expr_line(new_line);
  return '=';
}

/*
 * Set the expression for the '=' register.
 * Argument must be an allocated string.
 */
void set_expr_line(char_u *new_line)
{
  vim_free(expr_line);
  expr_line = new_line;
}

/*
 * Get the result of the '=' register expression.
 * Returns a pointer to allocated memory, or NULL for failure.
 */
char_u *get_expr_line(void)
{
  char_u *expr_copy;
  char_u *rv;
  static int nested = 0;

  if (expr_line == NULL)
    return NULL;

  /* Make a copy of the expression, because evaluating it may cause it to be
   * changed. */
  expr_copy = vim_strsave(expr_line);
  if (expr_copy == NULL)
    return NULL;

  /* When we are invoked recursively limit the evaluation to 10 levels.
   * Then return the string as-is. */
  if (nested >= 10)
    return expr_copy;

  ++nested;
  rv = eval_to_string(expr_copy, NULL, TRUE);
  --nested;
  vim_free(expr_copy);
  return rv;
}

/*
 * Get the '=' register expression itself, without evaluating it.
 */
char_u *get_expr_line_src(void)
{
  if (expr_line == NULL)
    return NULL;
  return vim_strsave(expr_line);
}
#endif /* FEAT_EVAL */

/*
 * Check if 'regname' is a valid name of a yank register.
 * Note: There is no check for 0 (default register), caller should do this
 */
int valid_yank_reg(int regname,
                   int writing) /* if TRUE check for writable registers */
{
  if ((regname > 0 && ASCII_ISALNUM(regname)) ||
      (!writing && vim_strchr((char_u *)
#ifdef FEAT_EVAL
                                  "/.%:="
#else
                                  "/.%:"
#endif
                              ,
                              regname) != NULL) ||
      regname == '#' || regname == '"' || regname == '-' || regname == '_' || regname == '*' || regname == '+')
    return TRUE;
  return FALSE;
}

void get_yank_register_value(int regname, int *num_lines, char_u ***lines)
{
  yankreg_T *prev_y_current = y_current;
  int prev_y_append = y_append;

  get_yank_register(regname, 0);

  *lines = y_current->y_array;
  *num_lines = y_current->y_size;

  y_current = prev_y_current;
  y_append = prev_y_append;
}

/*
 * Set y_current and y_append, according to the value of "regname".
 * Cannot handle the '_' register.
 * Must only be called with a valid register name!
 *
 * If regname is 0 and writing, use register 0
 * If regname is 0 and reading, use previous register
 *
 * Return TRUE when the register should be inserted literally (selection or
 * clipboard).
 */
int get_yank_register(int regname, int writing)
{
  int i;
  int ret = FALSE;

  y_append = FALSE;

  int num_lines;
  char_u **lines;
  int blockType;
  int useExternalClipboard = 0;

  if (clipboardGetCallback != NULL && !writing)
  {
    useExternalClipboard = clipboardGetCallback(regname, &num_lines, &lines, &blockType);
  }

  if ((regname == 0 || regname == '"') && !writing && y_previous != NULL)
  {
    y_current = y_previous;

    if (useExternalClipboard)
    {
      free_yank_all(); /* free register */
      y_current->y_type = blockType;
      y_current->y_size = num_lines;
      y_current->y_array = lines;

#ifdef FEAT_VIMINFO
      y_current->y_time_set = vim_time();
#endif

      for (int i = 0; i < num_lines; i++)
      {
        y_current->y_array[i] = lines[i];
      }
    }

    return ret;
  }

  i = regname;
  if (VIM_ISDIGIT(i))
    i -= '0';
  else if (ASCII_ISLOWER(i))
    i = CharOrdLow(i) + 10;
  else if (ASCII_ISUPPER(i))
  {
    i = CharOrdUp(i) + 10;
    y_append = TRUE;
  }
  else if (regname == '-')
    i = DELETION_REGISTER;
  else if (regname == '*' || regname == '+')
  {
    if (regname == '*')
      i = STAR_REGISTER;
    else
      i = PLUS_REGISTER;

    y_current = &y_regs[i];

    /* update star register */
    if (!writing && useExternalClipboard)
    {
      free_yank_all(); /* free register */
      y_current->y_type = blockType;
      y_current->y_size = num_lines;
      y_current->y_array = lines;

#ifdef FEAT_VIMINFO
      y_current->y_time_set = vim_time();
#endif

      for (int i = 0; i < num_lines; i++)
      {
        y_current->y_array[i] = lines[i];
      }
    }

    ret = TRUE;
  }
  else /* not 0-9, a-z, A-Z or '-': use register 0 */
    i = 0;
  y_current = &(y_regs[i]);

  if (writing) /* remember the register we write into for do_put() */
    y_previous = y_current;

  return ret;
}

/*
 * Obtain the contents of a "normal" register. The register is made empty.
 * The returned pointer has allocated memory, use put_register() later.
 */
void *get_register(int name,
                   int copy) /* make a copy, if FALSE make register empty. */
{
  yankreg_T *reg;
  int i;

  get_yank_register(name, 0);
  reg = ALLOC_ONE(yankreg_T);
  if (reg != NULL)
  {
    *reg = *y_current;
    if (copy)
    {
      /* If we run out of memory some or all of the lines are empty. */
      if (reg->y_size == 0)
        reg->y_array = NULL;
      else
        reg->y_array = ALLOC_MULT(char_u *, reg->y_size);
      if (reg->y_array != NULL)
      {
        for (i = 0; i < reg->y_size; ++i)
          reg->y_array[i] = vim_strsave(y_current->y_array[i]);
      }
    }
    else
      y_current->y_array = NULL;
  }
  return (void *)reg;
}

/*
 * Put "reg" into register "name".  Free any previous contents and "reg".
 */
void put_register(int name, void *reg)
{
  get_yank_register(name, 0);
  free_yank_all();
  *y_current = *(yankreg_T *)reg;
  vim_free(reg);
}

/*
 * Start or stop recording into a yank register.
 *
 * Return FAIL for failure, OK otherwise.
 */
int do_record(int c)
{
  char_u *p;
  static int regname;
  yankreg_T *old_y_previous, *old_y_current;
  int retval;

  if (reg_recording == 0) /* start recording */
  {
    /* registers 0-9, a-z and " are allowed */
    if (c < 0 || (!ASCII_ISALNUM(c) && c != '"'))
      retval = FAIL;
    else
    {
      reg_recording = c;
      regname = c;
      retval = OK;

      if (macroStartRecordCallback != NULL)
      {
        macroStartRecordCallback(regname);
      }
    }
  }
  else /* stop recording */
  {
    /*
     * Get the recorded key hits.  K_SPECIAL and CSI will be escaped, this
     * needs to be removed again to put it in a register.  exec_reg then
     * adds the escaping back later.
     */
    reg_recording = 0;
    msg("");
    p = get_recorded();
    if (p == NULL)
      retval = FAIL;
    else
    {
      /* Remove escaping for CSI and K_SPECIAL in multi-byte chars. */
      vim_unescape_csi(p);

      if (macroStopRecordCallback != NULL)
      {
        macroStopRecordCallback(regname, p);
      }

      /*
       * We don't want to change the default register here, so save and
       * restore the current register name.
       */
      old_y_previous = y_previous;
      old_y_current = y_current;

      retval = stuff_yank(regname, p);

      y_previous = old_y_previous;
      y_current = old_y_current;
    }
  }
  return retval;
}

/*
 * Stuff string "p" into yank register "regname" as a single line (append if
 * uppercase).	"p" must have been alloced.
 *
 * return FAIL for failure, OK otherwise
 */
static int stuff_yank(int regname, char_u *p)
{
  char_u *lp;
  char_u **pp;

  /* check for read-only register */
  if (regname != 0 && !valid_yank_reg(regname, TRUE))
  {
    vim_free(p);
    return FAIL;
  }
  if (regname == '_') /* black hole: don't do anything */
  {
    vim_free(p);
    return OK;
  }
  get_yank_register(regname, TRUE);
  if (y_append && y_current->y_array != NULL)
  {
    pp = &(y_current->y_array[y_current->y_size - 1]);
    lp = alloc(STRLEN(*pp) + STRLEN(p) + 1);
    if (lp == NULL)
    {
      vim_free(p);
      return FAIL;
    }
    STRCPY(lp, *pp);
    STRCAT(lp, p);
    vim_free(p);
    vim_free(*pp);
    *pp = lp;
  }
  else
  {
    free_yank_all();
    if ((y_current->y_array = ALLOC_ONE(char_u *)) == NULL)
    {
      vim_free(p);
      return FAIL;
    }
    y_current->y_array[0] = p;
    y_current->y_size = 1;
    y_current->y_type = MCHAR; /* used to be MLINE, why? */
#ifdef FEAT_VIMINFO
    y_current->y_time_set = vim_time();
#endif
  }
  return OK;
}

static int execreg_lastc = NUL;

/*
 * Execute a yank register: copy it into the stuff buffer.
 *
 * Return FAIL for failure, OK otherwise.
 */
int do_execreg(int regname, int colon, /* insert ':' before each line */
               int addcr,              /* always add '\n' to end of line */
               int silent)             /* set "silent" flag in typeahead buffer */
{
  long i;
  char_u *p;
  int retval = OK;
  int remap;

  // repeat previous one
  if (regname == '@')
  {
    if (execreg_lastc == NUL)
    {
      emsg(_("E748: No previously used register"));
      return FAIL;
    }
    regname = execreg_lastc;
  }
  // check for valid regname
  if (regname == '%' || regname == '#' || !valid_yank_reg(regname, FALSE))
  {
    emsg_invreg(regname);
    return FAIL;
  }
  execreg_lastc = regname;

  // black hole: don't stuff anything
  if (regname == '_')
    return OK;

#ifdef FEAT_CMDHIST
  // use last command line
  if (regname == ':')
  {
    if (last_cmdline == NULL)
    {
      emsg(_(e_nolastcmd));
      return FAIL;
    }
    // don't keep the cmdline containing @:
    VIM_CLEAR(new_last_cmdline);
    // Escape all control characters with a CTRL-V
    p = vim_strsave_escaped_ext(last_cmdline,
                                (char_u *)"\001\002\003\004\005\006\007"
                                          "\010\011\012\013\014\015\016\017"
                                          "\020\021\022\023\024\025\026\027"
                                          "\030\031\032\033\034\035\036\037",
                                Ctrl_V, FALSE);
    if (p != NULL)
    {
      /* When in Visual mode "'<,'>" will be prepended to the command.
       * Remove it when it's already there. */
      if (VIsual_active && STRNCMP(p, "'<,'>", 5) == 0)
        retval = put_in_typebuf(p + 5, TRUE, TRUE, silent);
      else
        retval = put_in_typebuf(p, TRUE, TRUE, silent);
    }
    vim_free(p);
  }
#endif
#ifdef FEAT_EVAL
  else if (regname == '=')
  {
    p = get_expr_line();
    if (p == NULL)
      return FAIL;
    retval = put_in_typebuf(p, TRUE, colon, silent);
    vim_free(p);
  }
#endif
  else if (regname == '.') /* use last inserted text */
  {
    p = get_last_insert_save();
    if (p == NULL)
    {
      emsg(_(e_noinstext));
      return FAIL;
    }
    retval = put_in_typebuf(p, FALSE, colon, silent);
    vim_free(p);
  }
  else
  {
    get_yank_register(regname, FALSE);
    if (y_current->y_array == NULL)
      return FAIL;

    /* Disallow remaping for ":@r". */
    remap = colon ? REMAP_NONE : REMAP_YES;

    /*
     * Insert lines into typeahead buffer, from last one to first one.
     */
    put_reedit_in_typebuf(silent);
    for (i = y_current->y_size; --i >= 0;)
    {
      char_u *escaped;

      /* insert NL between lines and after last line if type is MLINE */
      if (y_current->y_type == MLINE || i < y_current->y_size - 1 || addcr)
      {
        if (ins_typebuf((char_u *)"\n", remap, 0, TRUE, silent) == FAIL)
          return FAIL;
      }
      escaped = vim_strsave_escape_csi(y_current->y_array[i]);
      if (escaped == NULL)
        return FAIL;
      retval = ins_typebuf(escaped, remap, 0, TRUE, silent);
      vim_free(escaped);
      if (retval == FAIL)
        return FAIL;
      if (colon && ins_typebuf((char_u *)":", remap, 0, TRUE, silent) == FAIL)
        return FAIL;
    }
    reg_executing = regname == 0 ? '"' : regname; // disable "q" command
  }
  return retval;
}

/*
 * If "restart_edit" is not zero, put it in the typeahead buffer, so that it's
 * used only after other typeahead has been processed.
 */
static void put_reedit_in_typebuf(int silent)
{
  char_u buf[3];

  if (restart_edit != NUL)
  {
    if (restart_edit == 'V')
    {
      buf[0] = 'g';
      buf[1] = 'R';
      buf[2] = NUL;
    }
    else
    {
      buf[0] = restart_edit == 'I' ? 'i' : restart_edit;
      buf[1] = NUL;
    }
    if (ins_typebuf(buf, REMAP_NONE, 0, TRUE, silent) == OK)
      restart_edit = NUL;
  }
}

/*
 * Insert register contents "s" into the typeahead buffer, so that it will be
 * executed again.
 * When "esc" is TRUE it is to be taken literally: Escape CSI characters and
 * no remapping.
 */
static int put_in_typebuf(char_u *s, int esc,
                          int colon, /* add ':' before the line */
                          int silent)
{
  int retval = OK;

  put_reedit_in_typebuf(silent);
  if (colon)
    retval = ins_typebuf((char_u *)"\n", REMAP_NONE, 0, TRUE, silent);
  if (retval == OK)
  {
    char_u *p;

    if (esc)
      p = vim_strsave_escape_csi(s);
    else
      p = s;
    if (p == NULL)
      retval = FAIL;
    else
      retval = ins_typebuf(p, esc ? REMAP_NONE : REMAP_YES, 0, TRUE, silent);
    if (esc)
      vim_free(p);
  }
  if (colon && retval == OK)
    retval = ins_typebuf((char_u *)":", REMAP_NONE, 0, TRUE, silent);
  return retval;
}

/*
 * Insert a yank register: copy it into the Read buffer.
 * Used by CTRL-R command and middle mouse button in insert mode.
 *
 * return FAIL for failure, OK otherwise
 */
int insert_reg(int regname,
               int literally_arg) /* insert literally, not as if typed */
{
  long i;
  int retval = OK;
  char_u *arg;
  int allocated;
  int literally = literally_arg;

  /*
   * It is possible to get into an endless loop by having CTRL-R a in
   * register a and then, in insert mode, doing CTRL-R a.
   * If you hit CTRL-C, the loop will be broken here.
   */
  ui_breakcheck();
  if (got_int)
    return FAIL;

  /* check for valid regname */
  if (regname != NUL && !valid_yank_reg(regname, FALSE))
    return FAIL;

  if (regname == '.') /* insert last inserted text */
    retval = stuff_inserted(NUL, 1L, TRUE);
  else if (get_spec_reg(regname, &arg, &allocated, TRUE))
  {
    if (arg == NULL)
      return FAIL;
    stuffescaped(arg, literally);
    if (allocated)
      vim_free(arg);
  }
  else /* name or number register */
  {
    if (get_yank_register(regname, FALSE))
      literally = TRUE;
    if (y_current->y_array == NULL)
      retval = FAIL;
    else
    {
      for (i = 0; i < y_current->y_size; ++i)
      {
        stuffescaped(y_current->y_array[i], literally);
        /*
         * Insert a newline between lines and after last line if
         * y_type is MLINE.
         */
        if (y_current->y_type == MLINE || i < y_current->y_size - 1)
          stuffcharReadbuff('\n');
      }
    }
  }

  return retval;
}

/*
 * Stuff a string into the typeahead buffer, such that edit() will insert it
 * literally ("literally" TRUE) or interpret is as typed characters.
 */
static void stuffescaped(char_u *arg, int literally)
{
  int c;
  char_u *start;

  while (*arg != NUL)
  {
    /* Stuff a sequence of normal ASCII characters, that's fast.  Also
     * stuff K_SPECIAL to get the effect of a special key when "literally"
     * is TRUE. */
    start = arg;
    while ((*arg >= ' '
#ifndef EBCDIC
            && *arg < DEL /* EBCDIC: chars above space are normal */
#endif
            ) ||
           (*arg == K_SPECIAL && !literally))
      ++arg;
    if (arg > start)
      stuffReadbuffLen(start, (long)(arg - start));

    /* stuff a single special character */
    if (*arg != NUL)
    {
      if (has_mbyte)
        c = mb_cptr2char_adv(&arg);
      else
        c = *arg++;
      if (literally && ((c < ' ' && c != TAB) || c == DEL))
        stuffcharReadbuff(Ctrl_V);
      stuffcharReadbuff(c);
    }
  }
}

/*
 * If "regname" is a special register, return TRUE and store a pointer to its
 * value in "argp".
 */
int get_spec_reg(int regname, char_u **argp,
                 int *allocated, /* return: TRUE when value was allocated */
                 int errmsg)     /* give error message when failing */
{
  int cnt;

  *argp = NULL;
  *allocated = FALSE;
  switch (regname)
  {
  case '%': /* file name */
    if (errmsg)
      check_fname(); /* will give emsg if not set */
    *argp = curbuf->b_fname;
    return TRUE;

  case '#':                      /* alternate file name */
    *argp = getaltfname(errmsg); /* may give emsg if not set */
    return TRUE;

#ifdef FEAT_EVAL
  case '=': /* result of expression */
    *argp = get_expr_line();
    *allocated = TRUE;
    return TRUE;
#endif

  case ':': /* last command line */
    if (last_cmdline == NULL && errmsg)
      emsg(_(e_nolastcmd));
    *argp = last_cmdline;
    return TRUE;

  case '/': /* last search-pattern */
    if (last_search_pat() == NULL && errmsg)
      emsg(_(e_noprevre));
    *argp = last_search_pat();
    return TRUE;

  case '.': /* last inserted text */
    *argp = get_last_insert_save();
    *allocated = TRUE;
    if (*argp == NULL && errmsg)
      emsg(_(e_noinstext));
    return TRUE;

#ifdef FEAT_SEARCHPATH
  case Ctrl_F: /* Filename under cursor */
  case Ctrl_P: /* Path under cursor, expand via "path" */
    if (!errmsg)
      return FALSE;
    *argp = file_name_at_cursor(
        FNAME_MESS | FNAME_HYP | (regname == Ctrl_P ? FNAME_EXP : 0), 1L, NULL);
    *allocated = TRUE;
    return TRUE;
#endif

  case Ctrl_W: /* word under cursor */
  case Ctrl_A: /* WORD (mnemonic All) under cursor */
    if (!errmsg)
      return FALSE;
    cnt = find_ident_under_cursor(
        argp, regname == Ctrl_W ? (FIND_IDENT | FIND_STRING) : FIND_STRING);
    *argp = cnt ? vim_strnsave(*argp, cnt) : NULL;
    *allocated = TRUE;
    return TRUE;

  case Ctrl_L: /* Line under cursor */
    if (!errmsg)
      return FALSE;

    *argp = ml_get_buf(curwin->w_buffer, curwin->w_cursor.lnum, FALSE);
    return TRUE;

  case '_': /* black hole: always empty */
    *argp = (char_u *)"";
    return TRUE;
  }

  return FALSE;
}

/*
 * Paste a yank register into the command line.
 * Only for non-special registers.
 * Used by CTRL-R command in command-line mode
 * insert_reg() can't be used here, because special characters from the
 * register contents will be interpreted as commands.
 *
 * return FAIL for failure, OK otherwise
 */
int cmdline_paste_reg(
    int regname,
    int literally_arg, /* Insert text literally instead of "as typed" */
    int remcr)         /* don't add CR characters */
{
  long i;
  int literally = literally_arg;

  if (get_yank_register(regname, FALSE))
    literally = TRUE;
  if (y_current->y_array == NULL)
    return FAIL;

  for (i = 0; i < y_current->y_size; ++i)
  {
    cmdline_paste_str(y_current->y_array[i], literally);

    /* Insert ^M between lines and after last line if type is MLINE.
     * Don't do this when "remcr" is TRUE. */
    if ((y_current->y_type == MLINE || i < y_current->y_size - 1) && !remcr)
      cmdline_paste_str((char_u *)"\r", literally);

    /* Check for CTRL-C, in case someone tries to paste a few thousand
     * lines and gets bored. */
    ui_breakcheck();
    if (got_int)
      return FAIL;
  }
  return OK;
}

int clipboard_is_available(void)
{
  return clipboardGetCallback != NULL;
}

/*
 * Adjust the register name pointed to with "rp" for the clipboard being
 * used always and the clipboard being available.
 */
void adjust_clip_reg(int *rp)
{
  /* If no reg. specified, and "unnamed" or "unnamedplus" is in 'clipboard',
   * use '*' or '+' reg, respectively. "unnamedplus" prevails. */
  if (*rp == 0 && (clip_unnamed != 0 || clip_unnamed_saved != 0))
  {
    if (clip_unnamed != 0)
      *rp = ((clip_unnamed & CLIP_UNNAMED_PLUS)) ? '+'
                                                 : '*';
    else
      *rp = ((clip_unnamed_saved & CLIP_UNNAMED_PLUS))
                ? '+'
                : '*';
  }
  if (!clipboard_is_available())
  {
    if (*rp == '*')
      *rp = 0;
    if (*rp == '+')
      *rp = 0;
  }
}

/*
 * Shift the delete registers: "9 is cleared, "8 becomes "9, etc.
 */
void shift_delete_registers()
{
  int n;

  y_current = &y_regs[9];
  free_yank_all(); /* free register nine */
  for (n = 9; n > 1; --n)
    y_regs[n] = y_regs[n - 1];
  y_current = &y_regs[1];
  if (!y_append)
    y_previous = y_current;
  y_regs[1].y_array = NULL; /* set register one to empty */
}

#if defined(FEAT_EVAL)
static void yank_do_autocmd(oparg_T *oap, yankreg_T *reg)
{
  static int recursive = FALSE;
  dict_T *v_event;
  list_T *list;
  int n;
  char_u buf[NUMBUFLEN + 2];
  long reglen = 0;

  if (recursive)
    return;

  v_event = get_vim_var_dict(VV_EVENT);

  list = list_alloc();
  if (list == NULL)
    return;
  for (n = 0; n < reg->y_size; n++)
    list_append_string(list, reg->y_array[n], -1);
  list->lv_lock = VAR_FIXED;
  dict_add_list(v_event, "regcontents", list);

  buf[0] = (char_u)oap->regname;
  buf[1] = NUL;
  dict_add_string(v_event, "regname", buf);

  buf[0] = get_op_char(oap->op_type);
  buf[1] = get_extra_op_char(oap->op_type);
  buf[2] = NUL;
  dict_add_string(v_event, "operator", buf);

  buf[0] = NUL;
  buf[1] = NUL;
  switch (get_reg_type(oap->regname, &reglen))
  {
  case MLINE:
    buf[0] = 'V';
    break;
  case MCHAR:
    buf[0] = 'v';
    break;
  case MBLOCK:
    vim_snprintf((char *)buf, sizeof(buf), "%c%ld", Ctrl_V, reglen + 1);
    break;
  }
  dict_add_string(v_event, "regtype", buf);

  /* Lock the dictionary and its keys */
  dict_set_items_ro(v_event);

  recursive = TRUE;
  textlock++;
  apply_autocmds(EVENT_TEXTYANKPOST, NULL, NULL, FALSE, curbuf);
  textlock--;
  recursive = FALSE;

  /* Empty the dictionary, v:event is still valid */
  dict_free_contents(v_event);
  hash_init(&v_event->dv_hashtab);
}
#endif

/*
 * Handle a delete operation.
 *
 * Return FAIL if undo failed, OK otherwise.
 */
int op_delete(oparg_T *oap)
{
  int n;
  linenr_T lnum;
  char_u *ptr;
  char_u *newp, *oldp;
  struct block_def bd;
  linenr_T old_lcount = curbuf->b_ml.ml_line_count;
  int did_yank = FALSE;

  if (curbuf->b_ml.ml_flags & ML_EMPTY) /* nothing to do */
    return OK;

  /* Nothing to delete, return here.	Do prepare undo, for op_change(). */
  if (oap->empty)
    return u_save_cursor();

  if (!curbuf->b_p_ma)
  {
    emsg(_(e_modifiable));
    return FAIL;
  }

  adjust_clip_reg(&oap->regname);

  if (has_mbyte)
    mb_adjust_opend(oap);

  /*
   * Imitate the strange Vi behaviour: If the delete spans more than one
   * line and motion_type == MCHAR and the result is a blank line, make the
   * delete linewise.  Don't do this for the change command or Visual mode.
   */
  if (oap->motion_type == MCHAR && !oap->is_VIsual && !oap->block_mode &&
      oap->line_count > 1 && oap->motion_force == NUL &&
      oap->op_type == OP_DELETE)
  {
    ptr = ml_get(oap->end.lnum) + oap->end.col;
    if (*ptr != NUL)
      ptr += oap->inclusive;
    ptr = skipwhite(ptr);
    if (*ptr == NUL && inindent(0))
      oap->motion_type = MLINE;
  }

  /*
   * Check for trying to delete (e.g. "D") in an empty line.
   * Note: For the change operator it is ok.
   */
  if (oap->motion_type == MCHAR && oap->line_count == 1 &&
      oap->op_type == OP_DELETE && *ml_get(oap->start.lnum) == NUL)
  {
    /*
     * It's an error to operate on an empty region, when 'E' included in
     * 'cpoptions' (Vi compatible).
     */
    if (virtual_op)
      /* Virtual editing: Nothing gets deleted, but we set the '[ and ']
       * marks as if it happened. */
      goto setmarks;
    if (vim_strchr(p_cpo, CPO_EMPTYREGION) != NULL)
      beep_flush();
    return OK;
  }

  /*
   * Do a yank of whatever we're about to delete.
   * If a yank register was specified, put the deleted text into that
   * register.  For the black hole register '_' don't yank anything.
   */
  if (oap->regname != '_')
  {
    if (oap->regname != 0)
    {
      /* check for read-only register */
      if (!valid_yank_reg(oap->regname, TRUE))
      {
        beep_flush();
        return OK;
      }
      get_yank_register(oap->regname, TRUE); /* yank into specif'd reg. */
      if (op_yank(oap, TRUE, FALSE) == OK)   /* yank without message */
        did_yank = TRUE;
    }

    /*
     * Put deleted text into register 1 and shift number registers if the
     * delete contains a line break, or when using a specific operator (Vi
     * compatible)
     * Use the register name from before adjust_clip_reg() may have
     * changed it.
     */
    if (oap->motion_type == MLINE || oap->line_count > 1 || oap->use_reg_one)
    {
      shift_delete_registers();
      if (op_yank(oap, TRUE, FALSE) == OK)
        did_yank = TRUE;
    }

    /* Yank into small delete register when no named register specified
     * and the delete is within one line. */
    if ((oap->regname == 0) &&
        oap->motion_type != MLINE && oap->line_count == 1)
    {
      oap->regname = '-';
      get_yank_register(oap->regname, TRUE);
      if (op_yank(oap, TRUE, FALSE) == OK)
        did_yank = TRUE;
      oap->regname = 0;
    }

    /*
     * If there's too much stuff to fit in the yank register, then get a
     * confirmation before doing the delete. This is crude, but simple.
     * And it avoids doing a delete of something we can't put back if we
     * want.
     */
    if (!did_yank)
    {
      int msg_silent_save = msg_silent;

      msg_silent = 0; /* must display the prompt */
      n = ask_yesno((char_u *)_("cannot yank; delete anyway"), TRUE);
      msg_silent = msg_silent_save;
      if (n != 'y')
      {
        emsg(_(e_abort));
        return FAIL;
      }
    }

#if defined(FEAT_EVAL)
    if (did_yank)
    {

      if (yankCallback != NULL)
      {
        // Call yankCallback
        yankInfo_T *yankInfo = (yankInfo_T *)alloc(sizeof(yankInfo_T));
        yankInfo->numLines = y_current->y_size;
        yankInfo->lines = y_current->y_array;
        yankInfo->start = oap->start;
        yankInfo->end = oap->end;
        yankInfo->blockType = y_current->y_type;
        yankInfo->regname = oap->regname;
        yankInfo->op_char = get_op_char(oap->op_type);
        yankInfo->extra_op_char = get_extra_op_char(oap->op_type);
        yankCallback(yankInfo);
        vim_free(yankInfo);
      }

      if (has_textyankpost())
      {
        yank_do_autocmd(oap, y_current);
      }
    }
#endif
  }

  /*
   * block mode delete
   */
  if (oap->block_mode)
  {
    if (u_save((linenr_T)(oap->start.lnum - 1),
               (linenr_T)(oap->end.lnum + 1)) == FAIL)
      return FAIL;

    for (lnum = curwin->w_cursor.lnum; lnum <= oap->end.lnum; ++lnum)
    {
      block_prep(oap, &bd, lnum, TRUE);
      if (bd.textlen == 0) /* nothing to delete */
        continue;

      /* Adjust cursor position for tab replaced by spaces and 'lbr'. */
      if (lnum == curwin->w_cursor.lnum)
      {
        curwin->w_cursor.col = bd.textcol + bd.startspaces;
        curwin->w_cursor.coladd = 0;
      }

      // "n" == number of chars deleted
      // If we delete a TAB, it may be replaced by several characters.
      // Thus the number of characters may increase!
      n = bd.textlen - bd.startspaces - bd.endspaces;
      oldp = ml_get(lnum);
      newp = alloc(STRLEN(oldp) + 1 - n);
      if (newp == NULL)
        continue;
      /* copy up to deleted part */
      mch_memmove(newp, oldp, (size_t)bd.textcol);
      /* insert spaces */
      vim_memset(newp + bd.textcol, ' ',
                 (size_t)(bd.startspaces + bd.endspaces));
      /* copy the part after the deleted part */
      oldp += bd.textcol + bd.textlen;
      STRMOVE(newp + bd.textcol + bd.startspaces + bd.endspaces, oldp);
      /* replace the line */
      ml_replace(lnum, newp, FALSE);
    }

    check_cursor_col();
    changed_lines(curwin->w_cursor.lnum, curwin->w_cursor.col,
                  oap->end.lnum + 1, 0L);
    oap->line_count = 0; /* no lines deleted */
  }
  else if (oap->motion_type == MLINE)
  {
    if (oap->op_type == OP_CHANGE)
    {
      /* Delete the lines except the first one.  Temporarily move the
       * cursor to the next line.  Save the current line number, if the
       * last line is deleted it may be changed.
       */
      if (oap->line_count > 1)
      {
        lnum = curwin->w_cursor.lnum;
        ++curwin->w_cursor.lnum;
        del_lines((long)(oap->line_count - 1), TRUE);
        curwin->w_cursor.lnum = lnum;
      }
      if (u_save_cursor() == FAIL)
        return FAIL;
      if (curbuf->b_p_ai) /* don't delete indent */
      {
        beginline(BL_WHITE); /* cursor on first non-white */
        did_ai = TRUE;       /* delete the indent when ESC hit */
        ai_col = curwin->w_cursor.col;
      }
      else
        beginline(0);       /* cursor in column 0 */
      truncate_line(FALSE); /* delete the rest of the line */
                            /* leave cursor past last char in line */
      if (oap->line_count > 1)
        u_clearline(); /* "U" command not possible after "2cc" */
    }
    else
    {
      del_lines(oap->line_count, TRUE);
      beginline(BL_WHITE | BL_FIX);
      u_clearline(); /* "U" command not possible after "dd" */
    }
  }
  else
  {
    if (virtual_op)
    {
      int endcol = 0;

      /* For virtualedit: break the tabs that are partly included. */
      if (gchar_pos(&oap->start) == '\t')
      {
        if (u_save_cursor() == FAIL) /* save first line for undo */
          return FAIL;
        if (oap->line_count == 1)
          endcol = getviscol2(oap->end.col, oap->end.coladd);
        coladvance_force(getviscol2(oap->start.col, oap->start.coladd));
        oap->start = curwin->w_cursor;
        if (oap->line_count == 1)
        {
          coladvance(endcol);
          oap->end.col = curwin->w_cursor.col;
          oap->end.coladd = curwin->w_cursor.coladd;
          curwin->w_cursor = oap->start;
        }
      }

      /* Break a tab only when it's included in the area. */
      if (gchar_pos(&oap->end) == '\t' &&
          (int)oap->end.coladd < oap->inclusive)
      {
        /* save last line for undo */
        if (u_save((linenr_T)(oap->end.lnum - 1),
                   (linenr_T)(oap->end.lnum + 1)) == FAIL)
          return FAIL;
        curwin->w_cursor = oap->end;
        coladvance_force(getviscol2(oap->end.col, oap->end.coladd));
        oap->end = curwin->w_cursor;
        curwin->w_cursor = oap->start;
      }
    }

    if (oap->line_count == 1) /* delete characters within one line */
    {
      if (u_save_cursor() == FAIL) /* save line for undo */
        return FAIL;

      /* if 'cpoptions' contains '$', display '$' at end of change */
      if (vim_strchr(p_cpo, CPO_DOLLAR) != NULL && oap->op_type == OP_CHANGE &&
          oap->end.lnum == curwin->w_cursor.lnum && !oap->is_VIsual)
        display_dollar(oap->end.col - !oap->inclusive);

      n = oap->end.col - oap->start.col + 1 - !oap->inclusive;

      if (virtual_op)
      {
        /* fix up things for virtualedit-delete:
         * break the tabs which are going to get in our way
         */
        char_u *curline = ml_get_curline();
        int len = (int)STRLEN(curline);

        if (oap->end.coladd != 0 && (int)oap->end.col >= len - 1 &&
            !(oap->start.coladd && (int)oap->end.col >= len - 1))
          n++;
        /* Delete at least one char (e.g, when on a control char). */
        if (n == 0 && oap->start.coladd != oap->end.coladd)
          n = 1;

        /* When deleted a char in the line, reset coladd. */
        if (gchar_cursor() != NUL)
          curwin->w_cursor.coladd = 0;
      }
      (void)del_bytes((long)n, !virtual_op,
                      oap->op_type == OP_DELETE && !oap->is_VIsual);
    }
    else /* delete characters between lines */
    {
      pos_T curpos;

      /* save deleted and changed lines for undo */
      if (u_save((linenr_T)(curwin->w_cursor.lnum - 1),
                 (linenr_T)(curwin->w_cursor.lnum + oap->line_count)) == FAIL)
        return FAIL;

      truncate_line(TRUE); /* delete from cursor to end of line */

      curpos = curwin->w_cursor; /* remember curwin->w_cursor */
      ++curwin->w_cursor.lnum;
      del_lines((long)(oap->line_count - 2), FALSE);

      /* delete from start of line until op_end */
      n = (oap->end.col + 1 - !oap->inclusive);
      curwin->w_cursor.col = 0;
      (void)del_bytes((long)n, !virtual_op,
                      oap->op_type == OP_DELETE && !oap->is_VIsual);
      curwin->w_cursor = curpos; /* restore curwin->w_cursor */
      (void)do_join(2, FALSE, FALSE, FALSE, FALSE);
    }
  }

  msgmore(curbuf->b_ml.ml_line_count - old_lcount);

setmarks:
  if (oap->block_mode)
  {
    curbuf->b_op_end.lnum = oap->end.lnum;
    curbuf->b_op_end.col = oap->start.col;
  }
  else
    curbuf->b_op_end = oap->start;
  curbuf->b_op_start = oap->start;

  return OK;
}

/*
 * Adjust end of operating area for ending on a multi-byte character.
 * Used for deletion.
 */
static void mb_adjust_opend(oparg_T *oap)
{
  char_u *p;

  if (oap->inclusive)
  {
    p = ml_get(oap->end.lnum);
    oap->end.col += mb_tail_off(p, p + oap->end.col);
  }
}

/*
 * Replace the character under the cursor with "c".
 * This takes care of multi-byte characters.
 */
static void replace_character(int c)
{
  int n = State;

  State = REPLACE;
  ins_char(c);
  State = n;
  /* Backup to the replaced character. */
  dec_cursor();
}

/*
 * Replace a whole area with one character.
 */
int op_replace(oparg_T *oap, int c)
{
  int n, numc;
  int num_chars;
  char_u *newp, *oldp;
  size_t oldlen;
  struct block_def bd;
  char_u *after_p = NULL;
  int had_ctrl_v_cr = FALSE;

  if ((curbuf->b_ml.ml_flags & ML_EMPTY) || oap->empty)
    return OK; /* nothing to do */

  if (c == REPLACE_CR_NCHAR)
  {
    had_ctrl_v_cr = TRUE;
    c = CAR;
  }
  else if (c == REPLACE_NL_NCHAR)
  {
    had_ctrl_v_cr = TRUE;
    c = NL;
  }

  if (has_mbyte)
    mb_adjust_opend(oap);

  if (u_save((linenr_T)(oap->start.lnum - 1), (linenr_T)(oap->end.lnum + 1)) ==
      FAIL)
    return FAIL;

  /*
   * block mode replace
   */
  if (oap->block_mode)
  {
    bd.is_MAX = (curwin->w_curswant == MAXCOL);
    for (; curwin->w_cursor.lnum <= oap->end.lnum; ++curwin->w_cursor.lnum)
    {
      curwin->w_cursor.col = 0; /* make sure cursor position is valid */
      block_prep(oap, &bd, curwin->w_cursor.lnum, TRUE);
      if (bd.textlen == 0 && (!virtual_op || bd.is_MAX))
        continue; /* nothing to replace */

      /* n == number of extra chars required
       * If we split a TAB, it may be replaced by several characters.
       * Thus the number of characters may increase!
       */
      /* If the range starts in virtual space, count the initial
       * coladd offset as part of "startspaces" */
      if (virtual_op && bd.is_short && *bd.textstart == NUL)
      {
        pos_T vpos;

        vpos.lnum = curwin->w_cursor.lnum;
        getvpos(&vpos, oap->start_vcol);
        bd.startspaces += vpos.coladd;
        n = bd.startspaces;
      }
      else
        /* allow for pre spaces */
        n = (bd.startspaces ? bd.start_char_vcols - 1 : 0);

      /* allow for post spp */
      n += (bd.endspaces && !bd.is_oneChar && bd.end_char_vcols > 0)
               ? bd.end_char_vcols - 1
               : 0;
      /* Figure out how many characters to replace. */
      numc = oap->end_vcol - oap->start_vcol + 1;
      if (bd.is_short && (!virtual_op || bd.is_MAX))
        numc -= (oap->end_vcol - bd.end_vcol) + 1;

      /* A double-wide character can be replaced only up to half the
       * times. */
      if ((*mb_char2cells)(c) > 1)
      {
        if ((numc & 1) && !bd.is_short)
        {
          ++bd.endspaces;
          ++n;
        }
        numc = numc / 2;
      }

      /* Compute bytes needed, move character count to num_chars. */
      num_chars = numc;
      numc *= (*mb_char2len)(c);
      /* oldlen includes textlen, so don't double count */
      n += numc - bd.textlen;

      oldp = ml_get_curline();
      oldlen = STRLEN(oldp);
      newp = alloc(oldlen + 1 + n);
      if (newp == NULL)
        continue;
      vim_memset(newp, NUL, (size_t)(oldlen + 1 + n));
      /* copy up to deleted part */
      mch_memmove(newp, oldp, (size_t)bd.textcol);
      oldp += bd.textcol + bd.textlen;
      /* insert pre-spaces */
      vim_memset(newp + bd.textcol, ' ', (size_t)bd.startspaces);
      /* insert replacement chars CHECK FOR ALLOCATED SPACE */
      /* REPLACE_CR_NCHAR/REPLACE_NL_NCHAR is used for entering CR
       * literally. */
      if (had_ctrl_v_cr || (c != '\r' && c != '\n'))
      {
        if (has_mbyte)
        {
          n = (int)STRLEN(newp);
          while (--num_chars >= 0)
            n += (*mb_char2bytes)(c, newp + n);
        }
        else
          vim_memset(newp + STRLEN(newp), c, (size_t)numc);
        if (!bd.is_short)
        {
          /* insert post-spaces */
          vim_memset(newp + STRLEN(newp), ' ', (size_t)bd.endspaces);
          /* copy the part after the changed part */
          STRMOVE(newp + STRLEN(newp), oldp);
        }
      }
      else
      {
        /* Replacing with \r or \n means splitting the line. */
        after_p = alloc(oldlen + 1 + n - STRLEN(newp));
        if (after_p != NULL)
          STRMOVE(after_p, oldp);
      }
      /* replace the line */
      ml_replace(curwin->w_cursor.lnum, newp, FALSE);
      if (after_p != NULL)
      {
        ml_append(curwin->w_cursor.lnum++, after_p, 0, FALSE);
        appended_lines_mark(curwin->w_cursor.lnum, 1L);
        oap->end.lnum++;
        vim_free(after_p);
      }
    }
  }
  else
  {
    /*
     * MCHAR and MLINE motion replace.
     */
    if (oap->motion_type == MLINE)
    {
      oap->start.col = 0;
      curwin->w_cursor.col = 0;
      oap->end.col = (colnr_T)STRLEN(ml_get(oap->end.lnum));
      if (oap->end.col)
        --oap->end.col;
    }
    else if (!oap->inclusive)
      dec(&(oap->end));

    while (LTOREQ_POS(curwin->w_cursor, oap->end))
    {
      n = gchar_cursor();
      if (n != NUL)
      {
        if ((*mb_char2len)(c) > 1 || (*mb_char2len)(n) > 1)
        {
          /* This is slow, but it handles replacing a single-byte
           * with a multi-byte and the other way around. */
          if (curwin->w_cursor.lnum == oap->end.lnum)
            oap->end.col += (*mb_char2len)(c) - (*mb_char2len)(n);
          replace_character(c);
        }
        else
        {
          if (n == TAB)
          {
            int end_vcol = 0;

            if (curwin->w_cursor.lnum == oap->end.lnum)
            {
              /* oap->end has to be recalculated when
               * the tab breaks */
              end_vcol = getviscol2(oap->end.col, oap->end.coladd);
            }
            coladvance_force(getviscol());
            if (curwin->w_cursor.lnum == oap->end.lnum)
              getvpos(&oap->end, end_vcol);
          }
          PBYTE(curwin->w_cursor, c);
        }
      }
      else if (virtual_op && curwin->w_cursor.lnum == oap->end.lnum)
      {
        int virtcols = oap->end.coladd;

        if (curwin->w_cursor.lnum == oap->start.lnum &&
            oap->start.col == oap->end.col && oap->start.coladd)
          virtcols -= oap->start.coladd;

        /* oap->end has been trimmed so it's effectively inclusive;
         * as a result an extra +1 must be counted so we don't
         * trample the NUL byte. */
        coladvance_force(getviscol2(oap->end.col, oap->end.coladd) + 1);
        curwin->w_cursor.col -= (virtcols + 1);
        for (; virtcols >= 0; virtcols--)
        {
          if ((*mb_char2len)(c) > 1)
            replace_character(c);
          else
            PBYTE(curwin->w_cursor, c);
          if (inc(&curwin->w_cursor) == -1)
            break;
        }
      }

      /* Advance to next character, stop at the end of the file. */
      if (inc_cursor() == -1)
        break;
    }
  }

  curwin->w_cursor = oap->start;
  check_cursor();
  changed_lines(oap->start.lnum, oap->start.col, oap->end.lnum + 1, 0L);

  /* Set "'[" and "']" marks. */
  curbuf->b_op_start = oap->start;
  curbuf->b_op_end = oap->end;

  return OK;
}

static int swapchars(int op_type, pos_T *pos, int length);

/*
 * Handle the (non-standard vi) tilde operator.  Also for "gu", "gU" and "g?".
 */
void op_tilde(oparg_T *oap)
{
  pos_T pos;
  struct block_def bd;
  int did_change = FALSE;

  if (u_save((linenr_T)(oap->start.lnum - 1), (linenr_T)(oap->end.lnum + 1)) ==
      FAIL)
    return;

  pos = oap->start;
  if (oap->block_mode) /* Visual block mode */
  {
    for (; pos.lnum <= oap->end.lnum; ++pos.lnum)
    {
      int one_change;

      block_prep(oap, &bd, pos.lnum, FALSE);
      pos.col = bd.textcol;
      one_change = swapchars(oap->op_type, &pos, bd.textlen);
      did_change |= one_change;
    }
    if (did_change)
      changed_lines(oap->start.lnum, 0, oap->end.lnum + 1, 0L);
  }
  else /* not block mode */
  {
    if (oap->motion_type == MLINE)
    {
      oap->start.col = 0;
      pos.col = 0;
      oap->end.col = (colnr_T)STRLEN(ml_get(oap->end.lnum));
      if (oap->end.col)
        --oap->end.col;
    }
    else if (!oap->inclusive)
      dec(&(oap->end));

    if (pos.lnum == oap->end.lnum)
      did_change = swapchars(oap->op_type, &pos, oap->end.col - pos.col + 1);
    else
      for (;;)
      {
        did_change |= swapchars(oap->op_type, &pos,
                                pos.lnum == oap->end.lnum
                                    ? oap->end.col + 1
                                    : (int)STRLEN(ml_get_pos(&pos)));
        if (LTOREQ_POS(oap->end, pos) || inc(&pos) == -1)
          break;
      }
    if (did_change)
    {
      changed_lines(oap->start.lnum, oap->start.col, oap->end.lnum + 1, 0L);
    }
  }

  if (!did_change && oap->is_VIsual)
    /* No change: need to remove the Visual selection */
    redraw_curbuf_later(INVERTED);

  /*
   * Set '[ and '] marks.
   */
  curbuf->b_op_start = oap->start;
  curbuf->b_op_end = oap->end;

  if (oap->line_count > p_report)
    smsg(NGETTEXT("%ld line changed", "%ld lines changed", oap->line_count),
         oap->line_count);
}

/*
 * Invoke swapchar() on "length" bytes at position "pos".
 * "pos" is advanced to just after the changed characters.
 * "length" is rounded up to include the whole last multi-byte character.
 * Also works correctly when the number of bytes changes.
 * Returns TRUE if some character was changed.
 */
static int swapchars(int op_type, pos_T *pos, int length)
{
  int todo;
  int did_change = 0;

  for (todo = length; todo > 0; --todo)
  {
    if (has_mbyte)
    {
      int len = (*mb_ptr2len)(ml_get_pos(pos));

      /* we're counting bytes, not characters */
      if (len > 0)
        todo -= len - 1;
    }
    did_change |= swapchar(op_type, pos);
    if (inc(pos) == -1) /* at end of file */
      break;
  }
  return did_change;
}

/*
 * If op_type == OP_UPPER: make uppercase,
 * if op_type == OP_LOWER: make lowercase,
 * if op_type == OP_ROT13: do rot13 encoding,
 * else swap case of character at 'pos'
 * returns TRUE when something actually changed.
 */
int swapchar(int op_type, pos_T *pos)
{
  int c;
  int nc;

  c = gchar_pos(pos);

  /* Only do rot13 encoding for ASCII characters. */
  if (c >= 0x80 && op_type == OP_ROT13)
    return FALSE;

  if (op_type == OP_UPPER && c == 0xdf &&
      (enc_latin1like || STRCMP(p_enc, "iso-8859-2") == 0))
  {
    pos_T sp = curwin->w_cursor;

    /* Special handling of German sharp s: change to "SS". */
    curwin->w_cursor = *pos;
    del_char(FALSE);
    ins_char('S');
    ins_char('S');
    curwin->w_cursor = sp;
    inc(pos);
  }

  if (enc_dbcs != 0 && c >= 0x100) /* No lower/uppercase letter */
    return FALSE;
  nc = c;
  if (MB_ISLOWER(c))
  {
    if (op_type == OP_ROT13)
      nc = ROT13(c, 'a');
    else if (op_type != OP_LOWER)
      nc = MB_TOUPPER(c);
  }
  else if (MB_ISUPPER(c))
  {
    if (op_type == OP_ROT13)
      nc = ROT13(c, 'A');
    else if (op_type != OP_UPPER)
      nc = MB_TOLOWER(c);
  }
  if (nc != c)
  {
    if (enc_utf8 && (c >= 0x80 || nc >= 0x80))
    {
      pos_T sp = curwin->w_cursor;

      curwin->w_cursor = *pos;
      /* don't use del_char(), it also removes composing chars */
      del_bytes(utf_ptr2len(ml_get_cursor()), FALSE, FALSE);
      ins_char(nc);
      curwin->w_cursor = sp;
    }
    else
      PBYTE(*pos, nc);
    return TRUE;
  }
  return FALSE;
}

/*
 * op_insert - Insert and append operators for Visual mode.
 */
void op_insert(oparg_T *oap, long count1)
{
  long ins_len, pre_textlen = 0;
  char_u *firstline, *ins_text;
  colnr_T ind_pre = 0, ind_post;
  struct block_def bd;
  int i;
  pos_T t1;

  /* edit() changes this - record it for OP_APPEND */
  bd.is_MAX = (curwin->w_curswant == MAXCOL);

  /* vis block is still marked. Get rid of it now. */
  curwin->w_cursor.lnum = oap->start.lnum;
  update_screen(INVERTED);

  if (oap->block_mode)
  {
    /* When 'virtualedit' is used, need to insert the extra spaces before
     * doing block_prep().  When only "block" is used, virtual edit is
     * already disabled, but still need it when calling
     * coladvance_force(). */
    if (curwin->w_cursor.coladd > 0)
    {
      int old_ve_flags = ve_flags;

      ve_flags = VE_ALL;
      if (u_save_cursor() == FAIL)
        return;
      coladvance_force(oap->op_type == OP_APPEND ? oap->end_vcol + 1
                                                 : getviscol());
      if (oap->op_type == OP_APPEND)
        --curwin->w_cursor.col;
      ve_flags = old_ve_flags;
    }
    /* Get the info about the block before entering the text */
    block_prep(oap, &bd, oap->start.lnum, TRUE);
    /* Get indent information */
    ind_pre = (colnr_T)getwhitecols_curline();
    firstline = ml_get(oap->start.lnum) + bd.textcol;

    if (oap->op_type == OP_APPEND)
      firstline += bd.textlen;
    pre_textlen = (long)STRLEN(firstline);
  }

  if (oap->op_type == OP_APPEND)
  {
    if (oap->block_mode && curwin->w_cursor.coladd == 0)
    {
      /* Move the cursor to the character right of the block. */
      curwin->w_set_curswant = TRUE;
      while (*ml_get_cursor() != NUL &&
             (curwin->w_cursor.col < bd.textcol + bd.textlen))
        ++curwin->w_cursor.col;
      if (bd.is_short && !bd.is_MAX)
      {
        /* First line was too short, make it longer and adjust the
         * values in "bd". */
        if (u_save_cursor() == FAIL)
          return;
        for (i = 0; i < bd.endspaces; ++i)
          ins_char(' ');
        bd.textlen += bd.endspaces;
      }
    }
    else
    {
      curwin->w_cursor = oap->end;
      check_cursor_col();

      /* Works just like an 'i'nsert on the next character. */
      if (!LINEEMPTY(curwin->w_cursor.lnum) && oap->start_vcol != oap->end_vcol)
        inc_cursor();
    }
  }

  t1 = oap->start;
  (void)edit(NUL, FALSE, (linenr_T)count1);

  /* When a tab was inserted, and the characters in front of the tab
   * have been converted to a tab as well, the column of the cursor
   * might have actually been reduced, so need to adjust here. */
  if (t1.lnum == curbuf->b_op_start_orig.lnum &&
      LT_POS(curbuf->b_op_start_orig, t1))
    oap->start = curbuf->b_op_start_orig;

  /* If user has moved off this line, we don't know what to do, so do
   * nothing.
   * Also don't repeat the insert when Insert mode ended with CTRL-C. */
  if (curwin->w_cursor.lnum != oap->start.lnum || got_int)
    return;

  if (oap->block_mode)
  {
    struct block_def bd2;
    int did_indent = FALSE;
    size_t len;
    int add;

    /* If indent kicked in, the firstline might have changed
     * but only do that, if the indent actually increased. */
    ind_post = (colnr_T)getwhitecols_curline();
    if (curbuf->b_op_start.col > ind_pre && ind_post > ind_pre)
    {
      bd.textcol += ind_post - ind_pre;
      bd.start_vcol += ind_post - ind_pre;
      did_indent = TRUE;
    }

    /* The user may have moved the cursor before inserting something, try
     * to adjust the block for that.  But only do it, if the difference
     * does not come from indent kicking in. */
    if (oap->start.lnum == curbuf->b_op_start_orig.lnum && !bd.is_MAX &&
        !did_indent)
    {
      if (oap->op_type == OP_INSERT &&
          oap->start.col + oap->start.coladd !=
              curbuf->b_op_start_orig.col + curbuf->b_op_start_orig.coladd)
      {
        int t = getviscol2(curbuf->b_op_start_orig.col,
                           curbuf->b_op_start_orig.coladd);
        oap->start.col = curbuf->b_op_start_orig.col;
        pre_textlen -= t - oap->start_vcol;
        oap->start_vcol = t;
      }
      else if (oap->op_type == OP_APPEND &&
               oap->end.col + oap->end.coladd >=
                   curbuf->b_op_start_orig.col +
                       curbuf->b_op_start_orig.coladd)
      {
        int t = getviscol2(curbuf->b_op_start_orig.col,
                           curbuf->b_op_start_orig.coladd);
        oap->start.col = curbuf->b_op_start_orig.col;
        /* reset pre_textlen to the value of OP_INSERT */
        pre_textlen += bd.textlen;
        pre_textlen -= t - oap->start_vcol;
        oap->start_vcol = t;
        oap->op_type = OP_INSERT;
      }
    }

    /*
     * Spaces and tabs in the indent may have changed to other spaces and
     * tabs.  Get the starting column again and correct the length.
     * Don't do this when "$" used, end-of-line will have changed.
     */
    block_prep(oap, &bd2, oap->start.lnum, TRUE);
    if (!bd.is_MAX || bd2.textlen < bd.textlen)
    {
      if (oap->op_type == OP_APPEND)
      {
        pre_textlen += bd2.textlen - bd.textlen;
        if (bd2.endspaces)
          --bd2.textlen;
      }
      bd.textcol = bd2.textcol;
      bd.textlen = bd2.textlen;
    }

    /*
     * Subsequent calls to ml_get() flush the firstline data - take a
     * copy of the required string.
     */
    firstline = ml_get(oap->start.lnum);
    len = STRLEN(firstline);
    add = bd.textcol;
    if (oap->op_type == OP_APPEND)
      add += bd.textlen;
    if ((size_t)add > len)
      firstline += len; // short line, point to the NUL
    else
      firstline += add;
    if (pre_textlen >= 0 &&
        (ins_len = (long)STRLEN(firstline) - pre_textlen) > 0)
    {
      ins_text = vim_strnsave(firstline, (int)ins_len);
      if (ins_text != NULL)
      {
        /* block handled here */
        if (u_save(oap->start.lnum, (linenr_T)(oap->end.lnum + 1)) == OK)
          block_insert(oap, ins_text, (oap->op_type == OP_INSERT), &bd);

        curwin->w_cursor.col = oap->start.col;
        check_cursor();
        vim_free(ins_text);
      }
    }
  }
}

typedef struct
{
  oparg_T *oap;
  void *editContext;
  colnr_T l;
  int retval;
  long offset;
  linenr_T linenr;
  long ins_len;
  long pre_textlen;
  long pre_indent;
  char_u *firstline;
  char_u *ins_text;
  char_u *newp;
  char_u *oldp;
  struct block_def bd;
} changeState_T;

void *state_change_initialize(oparg_T *oap)
{
  changeState_T *context = (changeState_T *)alloc(sizeof(changeState_T));

  context->pre_textlen = 0;
  context->pre_indent = 0;
  context->oap = oap;

  context->l = oap->start.col;
  if (oap->motion_type == MLINE)
  {
    context->l = 0;
#ifdef FEAT_SMARTINDENT
    if (!p_paste && curbuf->b_p_si)
      can_si = TRUE; /* It's like opening a new line, do si */
#endif
  }

  /* First delete the text in the region.  In an empty buffer only need to
   * save for undo */
  if (curbuf->b_ml.ml_flags & ML_EMPTY)
  {
    if (u_save_cursor() == FAIL)
      return FALSE;
  }
  else if (op_delete(oap) == FAIL)
    return FALSE;

  if ((context->l > curwin->w_cursor.col) && !LINEEMPTY(curwin->w_cursor.lnum) &&
      !virtual_op)
    inc_cursor();

  /* check for still on same line (<CR> in inserted text meaningless) */
  /* skip blank lines too */
  if (oap->block_mode)
  {
    /* Add spaces before getting the current line length. */
    if (virtual_op && (curwin->w_cursor.coladd > 0 || gchar_cursor() == NUL))
      coladvance_force(getviscol());
    context->firstline = ml_get(context->oap->start.lnum);
    context->pre_textlen = (long)STRLEN(context->firstline);
    context->pre_indent = (long)getwhitecols(context->firstline);
    context->bd.textcol = curwin->w_cursor.col;
  }

  context->editContext = state_edit_initialize(NUL, FALSE, (linenr_T)1);

  return (void *)context;
};

executionStatus_T state_change_execute(void *ctx, int c)
{
  changeState_T *context = (changeState_T *)ctx;

  return state_edit_execute(context->editContext, c);
};

void state_change_cleanup(void *ctx)
{
  changeState_T *context = (changeState_T *)ctx;

  state_edit_cleanup(context->editContext);

  /*
   * In Visual block mode, handle copying the new text to all lines of the
   * block.
   * Don't repeat the insert when Insert mode ended with CTRL-C.
   */
  if (context->oap->block_mode && context->oap->start.lnum != context->oap->end.lnum && !got_int)
  {
    /* Auto-indenting may have changed the indent.  If the cursor was past
     * the indent, exclude that indent change from the inserted text. */
    context->firstline = ml_get(context->oap->start.lnum);
    if (context->bd.textcol > (colnr_T)context->pre_indent)
    {
      long new_indent = (long)getwhitecols(context->firstline);

      context->pre_textlen += new_indent - context->pre_indent;
      context->bd.textcol += new_indent - context->pre_indent;
    }

    context->ins_len = (long)STRLEN(context->firstline) - context->pre_textlen;
    if (context->ins_len > 0)
    {
      /* Subsequent calls to ml_get() flush the firstline data - take a
       * copy of the inserted text.  */
      if ((context->ins_text = alloc(context->ins_len + 1)) != NULL)
      {
        vim_strncpy(context->ins_text, context->firstline + context->bd.textcol, (size_t)context->ins_len);
        for (context->linenr = context->oap->start.lnum + 1; context->linenr <= context->oap->end.lnum; context->linenr++)
        {
          block_prep(context->oap, &context->bd, context->linenr, TRUE);
          if (!context->bd.is_short || virtual_op)
          {
            pos_T vpos;

            /* If the block starts in virtual space, count the
             * initial coladd offset as part of "startspaces" */
            if (context->bd.is_short)
            {
              vpos.lnum = context->linenr;
              (void)getvpos(&vpos, context->oap->start_vcol);
            }
            else
              vpos.coladd = 0;
            context->oldp = ml_get(context->linenr);
            context->newp = alloc(STRLEN(context->oldp) + vpos.coladd + context->ins_len + 1);
            if (context->newp == NULL)
              continue;
            /* copy up to block start */
            mch_memmove(context->newp, context->oldp, (size_t)context->bd.textcol);
            context->offset = context->bd.textcol;
            vim_memset(context->newp + context->offset, ' ', (size_t)vpos.coladd);
            context->offset += vpos.coladd;
            mch_memmove(context->newp + context->offset, context->ins_text, (size_t)context->ins_len);
            context->offset += context->ins_len;
            context->oldp += context->bd.textcol;
            STRMOVE(context->newp + context->offset, context->oldp);
            ml_replace(context->linenr, context->newp, FALSE);
          }
        }
        check_cursor();

        changed_lines(context->oap->start.lnum + 1, 0, context->oap->end.lnum + 1, 0L);
      }
      vim_free(context->ins_text);
    }
  }

  vim_free(context);
}

/*
 * set all the yank registers to empty (called from main())
 */
void init_yank(void)
{
  int i;

  for (i = 0; i < NUM_REGISTERS; ++i)
    y_regs[i].y_array = NULL;
}

#if defined(EXITFREE) || defined(PROTO)
void clear_registers(void)
{
  int i;

  for (i = 0; i < NUM_REGISTERS; ++i)
  {
    y_current = &y_regs[i];
    if (y_current->y_array != NULL)
      free_yank_all();
  }
}
#endif

/*
 * Free "n" lines from the current yank register.
 * Called for normal freeing and in case of error.
 */
static void free_yank(long n)
{
  if (y_current->y_array != NULL)
  {
    long i;

    for (i = n; --i >= 0;)
    {
      vim_free(y_current->y_array[i]);
    }
    VIM_CLEAR(y_current->y_array);
  }
}

static void free_yank_all(void) { free_yank(y_current->y_size); }

/*
 * Yank the text between "oap->start" and "oap->end" into a yank register.
 * If we are to append (uppercase register), we first yank into a new yank
 * register and then concatenate the old and the new one (so we keep the old
 * one in case of out-of-memory).
 *
 * Return FAIL for failure, OK otherwise.
 */
int op_yank(oparg_T *oap, int deleting, int mess)
{
  long y_idx;       /* index in y_array[] */
  yankreg_T *curr;  /* copy of y_current */
  yankreg_T newreg; /* new yank register when appending */
  char_u **new_ptr;
  linenr_T lnum; /* current line number */
  long j;
  int yanktype = oap->motion_type;
  long yanklines = oap->line_count;
  linenr_T yankendlnum = oap->end.lnum;
  char_u *p;
  char_u *pnew;
  struct block_def bd;

  /* check for read-only register */
  if (oap->regname != 0 && !valid_yank_reg(oap->regname, TRUE))
  {
    beep_flush();
    return FAIL;
  }
  if (oap->regname == '_') /* black hole: nothing to do */
    return OK;

  if (!deleting) /* op_delete() already set y_current */
    get_yank_register(oap->regname, TRUE);

  curr = y_current;
  /* append to existing contents */
  if (y_append && y_current->y_array != NULL)
    y_current = &newreg;
  else
    free_yank_all(); /* free previously yanked lines */

  /*
   * If the cursor was in column 1 before and after the movement, and the
   * operator is not inclusive, the yank is always linewise.
   */
  if (oap->motion_type == MCHAR && oap->start.col == 0 && !oap->inclusive &&
      (!oap->is_VIsual || *p_sel == 'o') && !oap->block_mode &&
      oap->end.col == 0 && yanklines > 1)
  {
    yanktype = MLINE;
    --yankendlnum;
    --yanklines;
  }

  y_current->y_size = yanklines;
  y_current->y_type = yanktype; /* set the yank register type */
  y_current->y_width = 0;
  y_current->y_array = lalloc_clear(sizeof(char_u *) * yanklines, TRUE);
  if (y_current->y_array == NULL)
  {
    y_current = curr;
    return FAIL;
  }
#ifdef FEAT_VIMINFO
  y_current->y_time_set = vim_time();
#endif

  y_idx = 0;
  lnum = oap->start.lnum;

  if (oap->block_mode)
  {
    /* Visual block mode */
    y_current->y_type = MBLOCK; /* set the yank register type */
    y_current->y_width = oap->end_vcol - oap->start_vcol;

    if (curwin->w_curswant == MAXCOL && y_current->y_width > 0)
      y_current->y_width--;
  }

  for (; lnum <= yankendlnum; lnum++, y_idx++)
  {
    switch (y_current->y_type)
    {
    case MBLOCK:
      block_prep(oap, &bd, lnum, FALSE);
      if (yank_copy_line(&bd, y_idx) == FAIL)
        goto fail;
      break;

    case MLINE:
      if ((y_current->y_array[y_idx] = vim_strsave(ml_get(lnum))) == NULL)
        goto fail;
      break;

    case MCHAR:
    {
      colnr_T startcol = 0, endcol = MAXCOL;
      int is_oneChar = FALSE;
      colnr_T cs, ce;

      p = ml_get(lnum);
      bd.startspaces = 0;
      bd.endspaces = 0;

      if (lnum == oap->start.lnum)
      {
        startcol = oap->start.col;
        if (virtual_op)
        {
          getvcol(curwin, &oap->start, &cs, NULL, &ce);
          if (ce != cs && oap->start.coladd > 0)
          {
            /* Part of a tab selected -- but don't
             * double-count it. */
            bd.startspaces = (ce - cs + 1) - oap->start.coladd;
            startcol++;
          }
        }
      }

      if (lnum == oap->end.lnum)
      {
        endcol = oap->end.col;
        if (virtual_op)
        {
          getvcol(curwin, &oap->end, &cs, NULL, &ce);
          if (p[endcol] == NUL || (cs + oap->end.coladd < ce
                                   /* Don't add space for double-wide
                                    * char; endcol will be on last byte
                                    * of multi-byte char. */
                                   && (*mb_head_off)(p, p + endcol) == 0))
          {
            if (oap->start.lnum == oap->end.lnum &&
                oap->start.col == oap->end.col)
            {
              /* Special case: inside a single char */
              is_oneChar = TRUE;
              bd.startspaces =
                  oap->end.coladd - oap->start.coladd + oap->inclusive;
              endcol = startcol;
            }
            else
            {
              bd.endspaces = oap->end.coladd + oap->inclusive;
              endcol -= oap->inclusive;
            }
          }
        }
      }
      if (endcol == MAXCOL)
        endcol = (colnr_T)STRLEN(p);
      if (startcol > endcol || is_oneChar)
        bd.textlen = 0;
      else
        bd.textlen = endcol - startcol + oap->inclusive;
      bd.textstart = p + startcol;
      if (yank_copy_line(&bd, y_idx) == FAIL)
        goto fail;
      break;
    }
      /* NOTREACHED */
    }
  }

  if (curr != y_current) /* append the new block to the old block */
  {
    new_ptr = ALLOC_MULT(char_u *, curr->y_size + y_current->y_size);
    if (new_ptr == NULL)
      goto fail;
    for (j = 0; j < curr->y_size; ++j)
      new_ptr[j] = curr->y_array[j];
    vim_free(curr->y_array);
    curr->y_array = new_ptr;
#ifdef FEAT_VIMINFO
    curr->y_time_set = vim_time();
#endif

    if (yanktype == MLINE) /* MLINE overrides MCHAR and MBLOCK */
      curr->y_type = MLINE;

    /* Concatenate the last line of the old block with the first line of
     * the new block, unless being Vi compatible. */
    if (curr->y_type == MCHAR && vim_strchr(p_cpo, CPO_REGAPPEND) == NULL)
    {
      pnew = alloc(STRLEN(curr->y_array[curr->y_size - 1]) +
                   STRLEN(y_current->y_array[0]) + 1);
      if (pnew == NULL)
      {
        y_idx = y_current->y_size - 1;
        goto fail;
      }
      STRCPY(pnew, curr->y_array[--j]);
      STRCAT(pnew, y_current->y_array[0]);
      vim_free(curr->y_array[j]);
      vim_free(y_current->y_array[0]);
      curr->y_array[j++] = pnew;
      y_idx = 1;
    }
    else
      y_idx = 0;
    while (y_idx < y_current->y_size)
      curr->y_array[j++] = y_current->y_array[y_idx++];
    curr->y_size = j;
    vim_free(y_current->y_array);
    y_current = curr;
  }
  if (curwin->w_p_rnu)
    redraw_later(SOME_VALID); /* cursor moved to start */
  if (mess)                   /* Display message about yank? */
  {
    if (yanktype == MCHAR && !oap->block_mode && yanklines == 1)
      yanklines = 0;
    /* Some versions of Vi use ">=" here, some don't...  */
    if (yanklines > p_report)
    {
      char namebuf[100];

      if (oap->regname == NUL)
        *namebuf = NUL;
      else
        vim_snprintf(namebuf, sizeof(namebuf), _(" into \"%c"), oap->regname);

      /* redisplay now, so message is not deleted */
      update_topline_redraw();
      if (oap->block_mode)
      {
        smsg(NGETTEXT("block of %ld line yanked%s",
                      "block of %ld lines yanked%s", yanklines),
             yanklines, namebuf);
      }
      else
      {
        smsg(NGETTEXT("%ld line yanked%s", "%ld lines yanked%s", yanklines),
             yanklines, namebuf);
      }
    }
  }

  /*
   * Set "'[" and "']" marks.
   */
  curbuf->b_op_start = oap->start;
  curbuf->b_op_end = oap->end;
  if (yanktype == MLINE && !oap->block_mode)
  {
    curbuf->b_op_start.col = 0;
    curbuf->b_op_end.col = MAXCOL;
  }

#if defined(FEAT_EVAL)
  if (!deleting)
  {
    if (yankCallback != NULL)
    {
      // Call yankCallback
      yankInfo_T *yankInfo = (yankInfo_T *)alloc(sizeof(yankInfo_T));
      yankInfo->numLines = y_current->y_size;
      yankInfo->lines = y_current->y_array;
      yankInfo->start = oap->start;
      yankInfo->end = oap->end;
      yankInfo->blockType = y_current->y_type;
      yankInfo->regname = oap->regname;
      yankInfo->op_char = get_op_char(oap->op_type);
      yankInfo->extra_op_char = get_extra_op_char(oap->op_type);
      yankCallback(yankInfo);
      vim_free(yankInfo);
    }
    if (has_textyankpost())
    {
      yank_do_autocmd(oap, y_current);
    }
  }
#endif

  return OK;

fail: /* free the allocated lines */
  free_yank(y_idx + 1);
  y_current = curr;
  return FAIL;
}

static int yank_copy_line(struct block_def *bd, long y_idx)
{
  char_u *pnew;

  if ((pnew = alloc(bd->startspaces + bd->endspaces + bd->textlen + 1)) == NULL)
    return FAIL;
  y_current->y_array[y_idx] = pnew;
  vim_memset(pnew, ' ', (size_t)bd->startspaces);
  pnew += bd->startspaces;
  mch_memmove(pnew, bd->textstart, (size_t)bd->textlen);
  pnew += bd->textlen;
  vim_memset(pnew, ' ', (size_t)bd->endspaces);
  pnew += bd->endspaces;
  *pnew = NUL;
  return OK;
}

/*
 * Put contents of register "regname" into the text.
 * Caller must check "regname" to be valid!
 * "flags": PUT_FIXINDENT	make indent look nice
 *	    PUT_CURSEND		leave cursor after end of new text
 *	    PUT_LINE		force linewise put (":put")
 */
void do_put(int regname, int dir, /* BACKWARD for 'P', FORWARD for 'p' */
            long count, int flags)
{
  char_u *ptr;
  char_u *newp, *oldp;
  int yanklen;
  int totlen = 0; /* init for gcc */
  linenr_T lnum;
  colnr_T col;
  long i; /* index in y_array[] */
  int y_type;
  long y_size;
  int oldlen;
  long y_width = 0;
  colnr_T vcol;
  int delcount;
  int incr = 0;
  long j;
  struct block_def bd;
  char_u **y_array = NULL;
  long nr_lines = 0;
  pos_T new_cursor;
  int indent;
  int orig_indent = 0; /* init for gcc */
  int indent_diff = 0; /* init for gcc */
  int first_indent = TRUE;
  int lendiff = 0;
  pos_T old_pos;
  char_u *insert_string = NULL;
  int allocated = FALSE;
  long cnt;

  /* Adjust register name for "unnamed" in 'clipboard'. */
  adjust_clip_reg(&regname);

  if (flags & PUT_FIXINDENT)
    orig_indent = get_indent();

  curbuf->b_op_start = curwin->w_cursor; /* default for '[ mark */
  curbuf->b_op_end = curwin->w_cursor;   /* default for '] mark */

  /*
   * Using inserted text works differently, because the register includes
   * special characters (newlines, etc.).
   */
  if (regname == '.')
  {
    if (VIsual_active)
      stuffcharReadbuff(VIsual_mode);
    (void)stuff_inserted((dir == FORWARD ? (count == -1 ? 'o' : 'a')
                                         : (count == -1 ? 'O' : 'i')),
                         count, FALSE);
    /* Putting the text is done later, so can't really move the cursor to
     * the next character.  Use "l" to simulate it. */
    if ((flags & PUT_CURSEND) && gchar_cursor() != NUL)
      stuffcharReadbuff('l');
    return;
  }

  /*
   * For special registers '%' (file name), '#' (alternate file name) and
   * ':' (last command line), etc. we have to create a fake yank register.
   */
  if (get_spec_reg(regname, &insert_string, &allocated, TRUE))
  {
    if (insert_string == NULL)
      return;
  }

  /* Autocommands may be executed when saving lines for undo.  This might
   * make "y_array" invalid, so we start undo now to avoid that. */
  if (u_save(curwin->w_cursor.lnum, curwin->w_cursor.lnum + 1) == FAIL)
    goto end;

  if (insert_string != NULL)
  {
    y_type = MCHAR;
#ifdef FEAT_EVAL
    if (regname == '=')
    {
      /* For the = register we need to split the string at NL
       * characters.
       * Loop twice: count the number of lines and save them. */
      for (;;)
      {
        y_size = 0;
        ptr = insert_string;
        while (ptr != NULL)
        {
          if (y_array != NULL)
            y_array[y_size] = ptr;
          ++y_size;
          ptr = vim_strchr(ptr, '\n');
          if (ptr != NULL)
          {
            if (y_array != NULL)
              *ptr = NUL;
            ++ptr;
            /* A trailing '\n' makes the register linewise. */
            if (*ptr == NUL)
            {
              y_type = MLINE;
              break;
            }
          }
        }
        if (y_array != NULL)
          break;
        y_array = ALLOC_MULT(char_u *, y_size);
        if (y_array == NULL)
          goto end;
      }
    }
    else
#endif
    {
      y_size = 1; /* use fake one-line yank register */
      y_array = &insert_string;
    }
  }
  else
  {
    get_yank_register(regname, FALSE);

    y_type = y_current->y_type;
    y_width = y_current->y_width;
    y_size = y_current->y_size;
    y_array = y_current->y_array;
  }

  if (y_type == MLINE)
  {
    if (flags & PUT_LINE_SPLIT)
    {
      char_u *p;

      /* "p" or "P" in Visual mode: split the lines to put the text in
       * between. */
      if (u_save_cursor() == FAIL)
        goto end;
      p = ml_get_cursor();
      if (dir == FORWARD && *p != NUL)
        MB_PTR_ADV(p);
      ptr = vim_strsave(p);
      if (ptr == NULL)
        goto end;
      ml_append(curwin->w_cursor.lnum, ptr, (colnr_T)0, FALSE);
      vim_free(ptr);

      oldp = ml_get_curline();
      p = oldp + curwin->w_cursor.col;
      if (dir == FORWARD && *p != NUL)
        MB_PTR_ADV(p);
      ptr = vim_strnsave(oldp, p - oldp);
      if (ptr == NULL)
        goto end;
      ml_replace(curwin->w_cursor.lnum, ptr, FALSE);
      ++nr_lines;
      dir = FORWARD;
    }
    if (flags & PUT_LINE_FORWARD)
    {
      /* Must be "p" for a Visual block, put lines below the block. */
      curwin->w_cursor = curbuf->b_visual.vi_end;
      dir = FORWARD;
    }
    curbuf->b_op_start = curwin->w_cursor; /* default for '[ mark */
    curbuf->b_op_end = curwin->w_cursor;   /* default for '] mark */
  }

  if (flags & PUT_LINE) /* :put command or "p" in Visual line mode. */
    y_type = MLINE;

  if (y_size == 0 || y_array == NULL)
  {
    semsg(_("E353: Nothing in register %s"),
          regname == 0 ? (char_u *)"\"" : transchar(regname));
    goto end;
  }

  if (y_type == MBLOCK)
  {
    lnum = curwin->w_cursor.lnum + y_size + 1;
    if (lnum > curbuf->b_ml.ml_line_count)
      lnum = curbuf->b_ml.ml_line_count + 1;
    if (u_save(curwin->w_cursor.lnum - 1, lnum) == FAIL)
      goto end;
  }
  else if (y_type == MLINE)
  {
    lnum = curwin->w_cursor.lnum;
#ifdef FEAT_FOLDING
    /* Correct line number for closed fold.  Don't move the cursor yet,
     * u_save() uses it. */
    if (dir == BACKWARD)
      (void)hasFolding(lnum, &lnum, NULL);
    else
      (void)hasFolding(lnum, NULL, &lnum);
#endif
    if (dir == FORWARD)
      ++lnum;
    /* In an empty buffer the empty line is going to be replaced, include
     * it in the saved lines. */
    if ((BUFEMPTY() ? u_save(0, 2) : u_save(lnum - 1, lnum)) == FAIL)
      goto end;
#ifdef FEAT_FOLDING
    if (dir == FORWARD)
      curwin->w_cursor.lnum = lnum - 1;
    else
      curwin->w_cursor.lnum = lnum;
    curbuf->b_op_start = curwin->w_cursor; /* for mark_adjust() */
#endif
  }
  else if (u_save_cursor() == FAIL)
    goto end;

  yanklen = (int)STRLEN(y_array[0]);

  if (ve_flags == VE_ALL && y_type == MCHAR)
  {
    if (gchar_cursor() == TAB)
    {
      /* Don't need to insert spaces when "p" on the last position of a
       * tab or "P" on the first position. */
#ifdef FEAT_VARTABS
      int viscol = getviscol();
      if (dir == FORWARD ? tabstop_padding(viscol, curbuf->b_p_ts,
                                           curbuf->b_p_vts_array) != 1
                         : curwin->w_cursor.coladd > 0)
        coladvance_force(viscol);
#else
      if (dir == FORWARD ? (int)curwin->w_cursor.coladd < curbuf->b_p_ts - 1
                         : curwin->w_cursor.coladd > 0)
        coladvance_force(getviscol());
#endif
      else
        curwin->w_cursor.coladd = 0;
    }
    else if (curwin->w_cursor.coladd > 0 || gchar_cursor() == NUL)
      coladvance_force(getviscol() + (dir == FORWARD));
  }

  lnum = curwin->w_cursor.lnum;
  col = curwin->w_cursor.col;

  /*
   * Block mode
   */
  if (y_type == MBLOCK)
  {
    int c = gchar_cursor();
    colnr_T endcol2 = 0;

    if (dir == FORWARD && c != NUL)
    {
      if (ve_flags == VE_ALL)
        getvcol(curwin, &curwin->w_cursor, &col, NULL, &endcol2);
      else
        getvcol(curwin, &curwin->w_cursor, NULL, NULL, &col);

      if (has_mbyte)
        /* move to start of next multi-byte character */
        curwin->w_cursor.col += (*mb_ptr2len)(ml_get_cursor());
      else if (c != TAB || ve_flags != VE_ALL)
        ++curwin->w_cursor.col;
      ++col;
    }
    else
      getvcol(curwin, &curwin->w_cursor, &col, NULL, &endcol2);

    col += curwin->w_cursor.coladd;
    if (ve_flags == VE_ALL &&
        (curwin->w_cursor.coladd > 0 || endcol2 == curwin->w_cursor.col))
    {
      if (dir == FORWARD && c == NUL)
        ++col;
      if (dir != FORWARD && c != NUL)
        ++curwin->w_cursor.col;
      if (c == TAB)
      {
        if (dir == BACKWARD && curwin->w_cursor.col)
          curwin->w_cursor.col--;
        if (dir == FORWARD && col - 1 == endcol2)
          curwin->w_cursor.col++;
      }
    }
    curwin->w_cursor.coladd = 0;
    bd.textcol = 0;
    for (i = 0; i < y_size; ++i)
    {
      int spaces;
      char shortline;

      bd.startspaces = 0;
      bd.endspaces = 0;
      vcol = 0;
      delcount = 0;

      /* add a new line */
      if (curwin->w_cursor.lnum > curbuf->b_ml.ml_line_count)
      {
        if (ml_append(curbuf->b_ml.ml_line_count, (char_u *)"", (colnr_T)1,
                      FALSE) == FAIL)
          break;
        ++nr_lines;
      }
      /* get the old line and advance to the position to insert at */
      oldp = ml_get_curline();
      oldlen = (int)STRLEN(oldp);
      for (ptr = oldp; vcol < col && *ptr;)
      {
        /* Count a tab for what it's worth (if list mode not on) */
        incr = lbr_chartabsize_adv(oldp, &ptr, (colnr_T)vcol);
        vcol += incr;
      }
      bd.textcol = (colnr_T)(ptr - oldp);

      shortline = (vcol < col) || (vcol == col && !*ptr);

      if (vcol < col) /* line too short, padd with spaces */
        bd.startspaces = col - vcol;
      else if (vcol > col)
      {
        bd.endspaces = vcol - col;
        bd.startspaces = incr - bd.endspaces;
        --bd.textcol;
        delcount = 1;
        if (has_mbyte)
          bd.textcol -= (*mb_head_off)(oldp, oldp + bd.textcol);
        if (oldp[bd.textcol] != TAB)
        {
          /* Only a Tab can be split into spaces.  Other
           * characters will have to be moved to after the
           * block, causing misalignment. */
          delcount = 0;
          bd.endspaces = 0;
        }
      }

      yanklen = (int)STRLEN(y_array[i]);

      /* calculate number of spaces required to fill right side of block*/
      spaces = y_width + 1;
      for (j = 0; j < yanklen; j++)
        spaces -= lbr_chartabsize(NULL, &y_array[i][j], 0);
      if (spaces < 0)
        spaces = 0;

      /* insert the new text */
      totlen = count * (yanklen + spaces) + bd.startspaces + bd.endspaces;
      newp = alloc(totlen + oldlen + 1);
      if (newp == NULL)
        break;
      /* copy part up to cursor to new line */
      ptr = newp;
      mch_memmove(ptr, oldp, (size_t)bd.textcol);
      ptr += bd.textcol;
      /* may insert some spaces before the new text */
      vim_memset(ptr, ' ', (size_t)bd.startspaces);
      ptr += bd.startspaces;
      /* insert the new text */
      for (j = 0; j < count; ++j)
      {
        mch_memmove(ptr, y_array[i], (size_t)yanklen);
        ptr += yanklen;

        /* insert block's trailing spaces only if there's text behind */
        if ((j < count - 1 || !shortline) && spaces)
        {
          vim_memset(ptr, ' ', (size_t)spaces);
          ptr += spaces;
        }
      }
      /* may insert some spaces after the new text */
      vim_memset(ptr, ' ', (size_t)bd.endspaces);
      ptr += bd.endspaces;
      /* move the text after the cursor to the end of the line. */
      mch_memmove(ptr, oldp + bd.textcol + delcount,
                  (size_t)(oldlen - bd.textcol - delcount + 1));
      ml_replace(curwin->w_cursor.lnum, newp, FALSE);

      ++curwin->w_cursor.lnum;
      if (i == 0)
        curwin->w_cursor.col += bd.startspaces;
    }

    changed_lines(lnum, 0, curwin->w_cursor.lnum, nr_lines);

    /* Set '[ mark. */
    curbuf->b_op_start = curwin->w_cursor;
    curbuf->b_op_start.lnum = lnum;

    /* adjust '] mark */
    curbuf->b_op_end.lnum = curwin->w_cursor.lnum - 1;
    curbuf->b_op_end.col = bd.textcol + totlen - 1;
    curbuf->b_op_end.coladd = 0;
    if (flags & PUT_CURSEND)
    {
      colnr_T len;

      curwin->w_cursor = curbuf->b_op_end;
      curwin->w_cursor.col++;

      /* in Insert mode we might be after the NUL, correct for that */
      len = (colnr_T)STRLEN(ml_get_curline());
      if (curwin->w_cursor.col > len)
        curwin->w_cursor.col = len;
    }
    else
      curwin->w_cursor.lnum = lnum;
  }
  else
  {
    /*
     * Character or Line mode
     */
    if (y_type == MCHAR)
    {
      /* if type is MCHAR, FORWARD is the same as BACKWARD on the next
       * char */
      if (dir == FORWARD && gchar_cursor() != NUL)
      {
        if (has_mbyte)
        {
          int bytelen = (*mb_ptr2len)(ml_get_cursor());

          /* put it on the next of the multi-byte character. */
          col += bytelen;
          if (yanklen)
          {
            curwin->w_cursor.col += bytelen;
            curbuf->b_op_end.col += bytelen;
          }
        }
        else
        {
          ++col;
          if (yanklen)
          {
            ++curwin->w_cursor.col;
            ++curbuf->b_op_end.col;
          }
        }
      }
      curbuf->b_op_start = curwin->w_cursor;
    }
    /*
     * Line mode: BACKWARD is the same as FORWARD on the previous line
     */
    else if (dir == BACKWARD)
      --lnum;
    new_cursor = curwin->w_cursor;

    /*
     * simple case: insert into current line
     */
    if (y_type == MCHAR && y_size == 1)
    {
      linenr_T end_lnum = 0; /* init for gcc */

      if (VIsual_active)
      {
        end_lnum = curbuf->b_visual.vi_end.lnum;
        if (end_lnum < curbuf->b_visual.vi_start.lnum)
          end_lnum = curbuf->b_visual.vi_start.lnum;
      }

      do
      {
        totlen = count * yanklen;
        if (totlen > 0)
        {
          oldp = ml_get(lnum);
          if (VIsual_active && col > (int)STRLEN(oldp))
          {
            lnum++;
            continue;
          }
          newp = alloc(STRLEN(oldp) + totlen + 1);
          if (newp == NULL)
            goto end; /* alloc() gave an error message */
          mch_memmove(newp, oldp, (size_t)col);
          ptr = newp + col;
          for (i = 0; i < count; ++i)
          {
            mch_memmove(ptr, y_array[0], (size_t)yanklen);
            ptr += yanklen;
          }
          STRMOVE(ptr, oldp + col);
          ml_replace(lnum, newp, FALSE);
          /* Place cursor on last putted char. */
          if (lnum == curwin->w_cursor.lnum)
          {
            /* make sure curwin->w_virtcol is updated */
            changed_cline_bef_curs();
            curwin->w_cursor.col += (colnr_T)(totlen - 1);
          }
        }
        if (VIsual_active)
          lnum++;
      } while (VIsual_active && lnum <= end_lnum);

      if (VIsual_active) /* reset lnum to the last visual line */
        lnum--;

      curbuf->b_op_end = curwin->w_cursor;
      /* For "CTRL-O p" in Insert mode, put cursor after last char */
      if (totlen && (restart_edit != 0 || (flags & PUT_CURSEND)))
        ++curwin->w_cursor.col;
      changed_bytes(lnum, col);
    }
    else
    {
      /*
       * Insert at least one line.  When y_type is MCHAR, break the first
       * line in two.
       */
      for (cnt = 1; cnt <= count; ++cnt)
      {
        i = 0;
        if (y_type == MCHAR)
        {
          /*
           * Split the current line in two at the insert position.
           * First insert y_array[size - 1] in front of second line.
           * Then append y_array[0] to first line.
           */
          lnum = new_cursor.lnum;
          ptr = ml_get(lnum) + col;
          totlen = (int)STRLEN(y_array[y_size - 1]);
          newp = alloc(STRLEN(ptr) + totlen + 1);
          if (newp == NULL)
            goto error;
          STRCPY(newp, y_array[y_size - 1]);
          STRCAT(newp, ptr);
          /* insert second line */
          ml_append(lnum, newp, (colnr_T)0, FALSE);
          vim_free(newp);

          oldp = ml_get(lnum);
          newp = alloc(col + yanklen + 1);
          if (newp == NULL)
            goto error;
          /* copy first part of line */
          mch_memmove(newp, oldp, (size_t)col);
          /* append to first line */
          mch_memmove(newp + col, y_array[0], (size_t)(yanklen + 1));
          ml_replace(lnum, newp, FALSE);

          curwin->w_cursor.lnum = lnum;
          i = 1;
        }

        for (; i < y_size; ++i)
        {
          if ((y_type != MCHAR || i < y_size - 1) &&
              ml_append(lnum, y_array[i], (colnr_T)0, FALSE) == FAIL)
            goto error;
          lnum++;
          ++nr_lines;
          if (flags & PUT_FIXINDENT)
          {
            old_pos = curwin->w_cursor;
            curwin->w_cursor.lnum = lnum;
            ptr = ml_get(lnum);
            if (cnt == count && i == y_size - 1)
              lendiff = (int)STRLEN(ptr);
#if defined(FEAT_SMARTINDENT)
            if (*ptr == '#' && preprocs_left())
              indent = 0; /* Leave # lines at start */
            else
#endif
                if (*ptr == NUL)
              indent = 0; /* Ignore empty lines */
            else if (first_indent)
            {
              indent_diff = orig_indent - get_indent();
              indent = orig_indent;
              first_indent = FALSE;
            }
            else if ((indent = get_indent() + indent_diff) < 0)
              indent = 0;
            (void)set_indent(indent, 0);
            curwin->w_cursor = old_pos;
            /* remember how many chars were removed */
            if (cnt == count && i == y_size - 1)
              lendiff -= (int)STRLEN(ml_get(lnum));
          }
        }
      }

    error:
      /* Adjust marks. */
      if (y_type == MLINE)
      {
        curbuf->b_op_start.col = 0;
        if (dir == FORWARD)
          curbuf->b_op_start.lnum++;
      }
      /* Skip mark_adjust when adding lines after the last one, there
       * can't be marks there. But still needed in diff mode. */
      if (curbuf->b_op_start.lnum + (y_type == MCHAR) - 1 + nr_lines <
              curbuf->b_ml.ml_line_count
#ifdef FEAT_DIFF
          || curwin->w_p_diff
#endif
      )
        mark_adjust(curbuf->b_op_start.lnum + (y_type == MCHAR),
                    (linenr_T)MAXLNUM, nr_lines, 0L);

      /* note changed text for displaying and folding */
      if (y_type == MCHAR)
        changed_lines(curwin->w_cursor.lnum, col, curwin->w_cursor.lnum + 1,
                      nr_lines);
      else
        changed_lines(curbuf->b_op_start.lnum, 0, curbuf->b_op_start.lnum,
                      nr_lines);

      /* put '] mark at last inserted character */
      curbuf->b_op_end.lnum = lnum;
      /* correct length for change in indent */
      col = (colnr_T)STRLEN(y_array[y_size - 1]) - lendiff;
      if (col > 1)
        curbuf->b_op_end.col = col - 1;
      else
        curbuf->b_op_end.col = 0;

      if (flags & PUT_CURSLINE)
      {
        /* ":put": put cursor on last inserted line */
        curwin->w_cursor.lnum = lnum;
        beginline(BL_WHITE | BL_FIX);
      }
      else if (flags & PUT_CURSEND)
      {
        /* put cursor after inserted text */
        if (y_type == MLINE)
        {
          if (lnum >= curbuf->b_ml.ml_line_count)
            curwin->w_cursor.lnum = curbuf->b_ml.ml_line_count;
          else
            curwin->w_cursor.lnum = lnum + 1;
          curwin->w_cursor.col = 0;
        }
        else
        {
          curwin->w_cursor.lnum = lnum;
          curwin->w_cursor.col = col;
        }
      }
      else if (y_type == MLINE)
      {
        /* put cursor on first non-blank in first inserted line */
        curwin->w_cursor.col = 0;
        if (dir == FORWARD)
          ++curwin->w_cursor.lnum;
        beginline(BL_WHITE | BL_FIX);
      }
      else /* put cursor on first inserted character */
        curwin->w_cursor = new_cursor;
    }
  }

  msgmore(nr_lines);
  curwin->w_set_curswant = TRUE;

end:
  if (allocated)
    vim_free(insert_string);
  if (regname == '=')
    vim_free(y_array);

  VIsual_active = FALSE;

  /* If the cursor is past the end of the line put it at the end. */
  adjust_cursor_eol();
}

/*
 * When the cursor is on the NUL past the end of the line and it should not be
 * there move it left.
 */
void adjust_cursor_eol(void)
{
  if (curwin->w_cursor.col > 0 && gchar_cursor() == NUL &&
      (ve_flags & VE_ONEMORE) == 0 && !(restart_edit || (State & INSERT)))
  {
    /* Put the cursor on the last character in the line. */
    dec_cursor();

    if (ve_flags == VE_ALL)
    {
      colnr_T scol, ecol;

      /* Coladd is set to the width of the last character. */
      getvcol(curwin, &curwin->w_cursor, &scol, NULL, &ecol);
      curwin->w_cursor.coladd = ecol - scol + 1;
    }
  }
}

#if defined(FEAT_SMARTINDENT) || defined(PROTO)
/*
 * Return TRUE if lines starting with '#' should be left aligned.
 */
int preprocs_left(void)
{
  return
#ifdef FEAT_SMARTINDENT
      curbuf->b_p_si
#endif
      ;
}
#endif

/*
 * Return the character name of the register with the given number.
 */
int get_register_name(int num)
{
  if (num == -1)
    return '"';
  else if (num < 10)
    return num + '0';
  else if (num == DELETION_REGISTER)
    return '-';
  else if (num == STAR_REGISTER)
    return '*';
  else if (num == PLUS_REGISTER)
    return '+';
  else
  {
#ifdef EBCDIC
    int i;

    /* EBCDIC is really braindead ... */
    i = 'a' + (num - 10);
    if (i > 'i')
      i += 7;
    if (i > 'r')
      i += 8;
    return i;
#else
    return num + 'a' - 10;
#endif
  }
}

/*
 * ":dis" and ":registers": Display the contents of the yank registers.
 */
void ex_display(exarg_T *eap)
{
  int i, n;
  long j;
  char_u *p;
  yankreg_T *yb;
  int name;
  int attr;
  char_u *arg = eap->arg;
  int clen;

  if (arg != NULL && *arg == NUL)
    arg = NULL;
  attr = HL_ATTR(HLF_8);

  /* Highlight title */
  msg_puts_title(_("\n--- Registers ---"));
  for (i = -1; i < NUM_REGISTERS && !got_int; ++i)
  {
    name = get_register_name(i);
    if (arg != NULL &&
        vim_strchr(arg, name) == NULL
#ifdef ONE_CLIPBOARD
        /* Star register and plus register contain the same thing. */
        && (name != '*' || vim_strchr(arg, '+') == NULL)
#endif
    )
      continue; /* did not ask for this register */

    /* Adjust register name for "unnamed" in 'clipboard'.
     * When it's a clipboard register, fill it with the current contents
     * of the clipboard.  */
    adjust_clip_reg(&name);

    if (i == -1)
    {
      if (y_previous != NULL)
        yb = y_previous;
      else
        yb = &(y_regs[0]);
    }
    else
      yb = &(y_regs[i]);

#ifdef FEAT_EVAL
    if (name == MB_TOLOWER(redir_reg) || (redir_reg == '"' && yb == y_previous))
      continue; /* do not list register being written to, the
                 * pointer can be freed */
#endif

    if (yb->y_array != NULL)
    {
      msg_putchar('\n');
      msg_putchar('"');
      msg_putchar(name);
      msg_puts("   ");

      n = (int)Columns - 6;
      for (j = 0; j < yb->y_size && n > 1; ++j)
      {
        if (j)
        {
          msg_puts_attr("^J", attr);
          n -= 2;
        }
        for (p = yb->y_array[j]; *p && (n -= ptr2cells(p)) >= 0; ++p)
        {
          clen = (*mb_ptr2len)(p);
          msg_outtrans_len(p, clen);
          p += clen - 1;
        }
      }
      if (n > 1 && yb->y_type == MLINE)
        msg_puts_attr("^J", attr);
    }
    ui_breakcheck();
  }

  /*
   * display last inserted text
   */
  if ((p = get_last_insert()) != NULL &&
      (arg == NULL || vim_strchr(arg, '.') != NULL) && !got_int)
  {
    msg_puts("\n\".   ");
    dis_msg(p, TRUE);
  }

  /*
   * display last command line
   */
  if (last_cmdline != NULL && (arg == NULL || vim_strchr(arg, ':') != NULL) &&
      !got_int)
  {
    msg_puts("\n\":   ");
    dis_msg(last_cmdline, FALSE);
  }

  /*
   * display current file name
   */
  if (curbuf->b_fname != NULL &&
      (arg == NULL || vim_strchr(arg, '%') != NULL) && !got_int)
  {
    msg_puts("\n\"%   ");
    dis_msg(curbuf->b_fname, FALSE);
  }

  /*
   * display alternate file name
   */
  if ((arg == NULL || vim_strchr(arg, '%') != NULL) && !got_int)
  {
    char_u *fname;
    linenr_T dummy;

    if (buflist_name_nr(0, &fname, &dummy) != FAIL)
    {
      msg_puts("\n\"#   ");
      dis_msg(fname, FALSE);
    }
  }

  /*
   * display last search pattern
   */
  if (last_search_pat() != NULL &&
      (arg == NULL || vim_strchr(arg, '/') != NULL) && !got_int)
  {
    msg_puts("\n\"/   ");
    dis_msg(last_search_pat(), FALSE);
  }

#ifdef FEAT_EVAL
  /*
   * display last used expression
   */
  if (expr_line != NULL && (arg == NULL || vim_strchr(arg, '=') != NULL) &&
      !got_int)
  {
    msg_puts("\n\"=   ");
    dis_msg(expr_line, FALSE);
  }
#endif
}

/*
 * display a string for do_dis()
 * truncate at end of screen line
 */
static void dis_msg(char_u *p, int skip_esc) /* if TRUE, ignore trailing ESC */
{
  int n;
  int l;

  n = (int)Columns - 6;
  while (*p != NUL && !(*p == ESC && skip_esc && *(p + 1) == NUL) &&
         (n -= ptr2cells(p)) >= 0)
  {
    if (has_mbyte && (l = (*mb_ptr2len)(p)) > 1)
    {
      msg_outtrans_len(p, l);
      p += l;
    }
    else
      msg_outtrans_len(p++, 1);
  }
  ui_breakcheck();
}

#if defined(FEAT_COMMENTS) || defined(PROTO)
/*
 * If "process" is TRUE and the line begins with a comment leader (possibly
 * after some white space), return a pointer to the text after it. Put a boolean
 * value indicating whether the line ends with an unclosed comment in
 * "is_comment".
 * line - line to be processed,
 * process - if FALSE, will only check whether the line ends with an unclosed
 *	     comment,
 * include_space - whether to also skip space following the comment leader,
 * is_comment - will indicate whether the current line ends with an unclosed
 *		comment.
 */
char_u *skip_comment(char_u *line, int process, int include_space,
                     int *is_comment)
{
  char_u *comment_flags = NULL;
  int lead_len;
  int leader_offset = get_last_leader_offset(line, &comment_flags);

  *is_comment = FALSE;
  if (leader_offset != -1)
  {
    /* Let's check whether the line ends with an unclosed comment.
     * If the last comment leader has COM_END in flags, there's no comment.
     */
    while (*comment_flags)
    {
      if (*comment_flags == COM_END || *comment_flags == ':')
        break;
      ++comment_flags;
    }
    if (*comment_flags != COM_END)
      *is_comment = TRUE;
  }

  if (process == FALSE)
    return line;

  lead_len = get_leader_len(line, &comment_flags, FALSE, include_space);

  if (lead_len == 0)
    return line;

  /* Find:
   * - COM_END,
   * - colon,
   * whichever comes first.
   */
  while (*comment_flags)
  {
    if (*comment_flags == COM_END || *comment_flags == ':')
      break;
    ++comment_flags;
  }

  /* If we found a colon, it means that we are not processing a line
   * starting with a closing part of a three-part comment. That's good,
   * because we don't want to remove those as this would be annoying.
   */
  if (*comment_flags == ':' || *comment_flags == NUL)
    line += lead_len;

  return line;
}
#endif

/*
 * Join 'count' lines (minimal 2) at cursor position.
 * When "save_undo" is TRUE save lines for undo first.
 * Set "use_formatoptions" to FALSE when e.g. processing backspace and comment
 * leaders should not be removed.
 * When setmark is TRUE, sets the '[ and '] mark, else, the caller is expected
 * to set those marks.
 *
 * return FAIL for failure, OK otherwise
 */
int do_join(long count, int insert_space, int save_undo,
            int use_formatoptions UNUSED, int setmark)
{
  char_u *curr = NULL;
  char_u *curr_start = NULL;
  char_u *cend;
  char_u *newp;
  char_u *spaces; /* number of spaces inserted before a line */
  int endcurr1 = NUL;
  int endcurr2 = NUL;
  int currsize = 0; /* size of the current line */
  int sumsize = 0;  /* size of the long new line */
  linenr_T t;
  colnr_T col = 0;
  int ret = OK;
#if defined(FEAT_COMMENTS) || defined(PROTO)
  int *comments = NULL;
  int remove_comments =
      (use_formatoptions == TRUE) && has_format_option(FO_REMOVE_COMS);
  int prev_was_comment;
#endif

  if (save_undo && u_save((linenr_T)(curwin->w_cursor.lnum - 1),
                          (linenr_T)(curwin->w_cursor.lnum + count)) == FAIL)
    return FAIL;

  /* Allocate an array to store the number of spaces inserted before each
   * line.  We will use it to pre-compute the length of the new line and the
   * proper placement of each original line in the new one. */
  spaces = lalloc_clear(count, TRUE);
  if (spaces == NULL)
    return FAIL;
#if defined(FEAT_COMMENTS) || defined(PROTO)
  if (remove_comments)
  {
    comments = lalloc_clear(count * sizeof(int), TRUE);
    if (comments == NULL)
    {
      vim_free(spaces);
      return FAIL;
    }
  }
#endif

  /*
   * Don't move anything yet, just compute the final line length
   * and setup the array of space strings lengths
   * This loops forward over the joined lines.
   */
  for (t = 0; t < count; ++t)
  {
    curr = curr_start = ml_get((linenr_T)(curwin->w_cursor.lnum + t));
    if (t == 0 && setmark)
    {
      /* Set the '[ mark. */
      curwin->w_buffer->b_op_start.lnum = curwin->w_cursor.lnum;
      curwin->w_buffer->b_op_start.col = (colnr_T)STRLEN(curr);
    }
#if defined(FEAT_COMMENTS) || defined(PROTO)
    if (remove_comments)
    {
      /* We don't want to remove the comment leader if the
       * previous line is not a comment. */
      if (t > 0 && prev_was_comment)
      {

        char_u *new_curr =
            skip_comment(curr, TRUE, insert_space, &prev_was_comment);
        comments[t] = (int)(new_curr - curr);
        curr = new_curr;
      }
      else
        curr = skip_comment(curr, FALSE, insert_space, &prev_was_comment);
    }
#endif

    if (insert_space && t > 0)
    {
      curr = skipwhite(curr);
      if (*curr != ')' && currsize != 0 && endcurr1 != TAB &&
          (!has_format_option(FO_MBYTE_JOIN) ||
           (mb_ptr2char(curr) < 0x100 && endcurr1 < 0x100)) &&
          (!has_format_option(FO_MBYTE_JOIN2) || mb_ptr2char(curr) < 0x100 ||
           endcurr1 < 0x100))
      {
        /* don't add a space if the line is ending in a space */
        if (endcurr1 == ' ')
          endcurr1 = endcurr2;
        else
          ++spaces[t];
        /* extra space when 'joinspaces' set and line ends in '.' */
        if (p_js &&
            (endcurr1 == '.' || (vim_strchr(p_cpo, CPO_JOINSP) == NULL &&
                                 (endcurr1 == '?' || endcurr1 == '!'))))
          ++spaces[t];
      }
    }
    currsize = (int)STRLEN(curr);
    sumsize += currsize + spaces[t];
    endcurr1 = endcurr2 = NUL;
    if (insert_space && currsize > 0)
    {
      if (has_mbyte)
      {
        cend = curr + currsize;
        MB_PTR_BACK(curr, cend);
        endcurr1 = (*mb_ptr2char)(cend);
        if (cend > curr)
        {
          MB_PTR_BACK(curr, cend);
          endcurr2 = (*mb_ptr2char)(cend);
        }
      }
      else
      {
        endcurr1 = *(curr + currsize - 1);
        if (currsize > 1)
          endcurr2 = *(curr + currsize - 2);
      }
    }
    line_breakcheck();
    if (got_int)
    {
      ret = FAIL;
      goto theend;
    }
  }

  /* store the column position before last line */
  col = sumsize - currsize - spaces[count - 1];

  /* allocate the space for the new line */
  newp = alloc(sumsize + 1);
  cend = newp + sumsize;
  *cend = 0;

  /*
   * Move affected lines to the new long one.
   * This loops backwards over the joined lines, including the original line.
   *
   * Move marks from each deleted line to the joined line, adjusting the
   * column.  This is not Vi compatible, but Vi deletes the marks, thus that
   * should not really be a problem.
   */
  for (t = count - 1;; --t)
  {
    int spaces_removed;

    cend -= currsize;
    mch_memmove(cend, curr, (size_t)currsize);
    if (spaces[t] > 0)
    {
      cend -= spaces[t];
      vim_memset(cend, ' ', (size_t)(spaces[t]));
    }

    // If deleting more spaces than adding, the cursor moves no more than
    // what is added if it is inside these spaces.
    spaces_removed = (curr - curr_start) - spaces[t];

    mark_col_adjust(curwin->w_cursor.lnum + t, (colnr_T)0, (linenr_T)-t,
                    (long)(cend - newp - spaces_removed), spaces_removed);
    if (t == 0)
      break;

    curr = curr_start = ml_get((linenr_T)(curwin->w_cursor.lnum + t - 1));
#if defined(FEAT_COMMENTS)
    if (remove_comments)
      curr += comments[t - 1];
#endif
    if (insert_space && t > 1)
      curr = skipwhite(curr);
    currsize = (int)STRLEN(curr);
  }

  ml_replace(curwin->w_cursor.lnum, newp, FALSE);

  if (setmark)
  {
    /* Set the '] mark. */
    curwin->w_buffer->b_op_end.lnum = curwin->w_cursor.lnum;
    curwin->w_buffer->b_op_end.col = (colnr_T)sumsize;
  }

  /* Only report the change in the first line here, del_lines() will report
   * the deleted line. */
  changed_lines(curwin->w_cursor.lnum, currsize, curwin->w_cursor.lnum + 1, 0L);
  /*
   * Delete following lines. To do this we move the cursor there
   * briefly, and then move it back. After del_lines() the cursor may
   * have moved up (last line deleted), so the current lnum is kept in t.
   */
  t = curwin->w_cursor.lnum;
  ++curwin->w_cursor.lnum;
  del_lines(count - 1, FALSE);
  curwin->w_cursor.lnum = t;

  /*
   * Set the cursor column:
   * Vi compatible: use the column of the first join
   * vim:	      use the column of the last join
   */
  curwin->w_cursor.col =
      (vim_strchr(p_cpo, CPO_JOINCOL) != NULL ? currsize : col);
  check_cursor_col();

  curwin->w_cursor.coladd = 0;
  curwin->w_set_curswant = TRUE;

theend:
  vim_free(spaces);
#if defined(FEAT_COMMENTS) || defined(PROTO)
  if (remove_comments)
    vim_free(comments);
#endif
  return ret;
}

#ifdef FEAT_COMMENTS
/*
 * Return TRUE if the two comment leaders given are the same.  "lnum" is
 * the first line.  White-space is ignored.  Note that the whole of
 * 'leader1' must match 'leader2_len' characters from 'leader2' -- webb
 */
static int same_leader(linenr_T lnum, int leader1_len, char_u *leader1_flags,
                       int leader2_len, char_u *leader2_flags)
{
  int idx1 = 0, idx2 = 0;
  char_u *p;
  char_u *line1;
  char_u *line2;

  if (leader1_len == 0)
    return (leader2_len == 0);

  /*
   * If first leader has 'f' flag, the lines can be joined only if the
   * second line does not have a leader.
   * If first leader has 'e' flag, the lines can never be joined.
   * If fist leader has 's' flag, the lines can only be joined if there is
   * some text after it and the second line has the 'm' flag.
   */
  if (leader1_flags != NULL)
  {
    for (p = leader1_flags; *p && *p != ':'; ++p)
    {
      if (*p == COM_FIRST)
        return (leader2_len == 0);
      if (*p == COM_END)
        return FALSE;
      if (*p == COM_START)
      {
        if (*(ml_get(lnum) + leader1_len) == NUL)
          return FALSE;
        if (leader2_flags == NULL || leader2_len == 0)
          return FALSE;
        for (p = leader2_flags; *p && *p != ':'; ++p)
          if (*p == COM_MIDDLE)
            return TRUE;
        return FALSE;
      }
    }
  }

  /*
   * Get current line and next line, compare the leaders.
   * The first line has to be saved, only one line can be locked at a time.
   */
  line1 = vim_strsave(ml_get(lnum));
  if (line1 != NULL)
  {
    for (idx1 = 0; VIM_ISWHITE(line1[idx1]); ++idx1)
      ;
    line2 = ml_get(lnum + 1);
    for (idx2 = 0; idx2 < leader2_len; ++idx2)
    {
      if (!VIM_ISWHITE(line2[idx2]))
      {
        if (line1[idx1++] != line2[idx2])
          break;
      }
      else
        while (VIM_ISWHITE(line1[idx1]))
          ++idx1;
    }
    vim_free(line1);
  }
  return (idx2 == leader2_len && idx1 == leader1_len);
}
#endif

/*
 * Implementation of the format operator 'gq'.
 */
void op_format(oparg_T *oap,
               int keep_cursor) /* keep cursor on same text char */
{
  long old_line_count = curbuf->b_ml.ml_line_count;

  /* Place the cursor where the "gq" or "gw" command was given, so that "u"
   * can put it back there. */
  curwin->w_cursor = oap->cursor_start;

  if (u_save((linenr_T)(oap->start.lnum - 1), (linenr_T)(oap->end.lnum + 1)) ==
      FAIL)
    return;
  curwin->w_cursor = oap->start;

  if (oap->is_VIsual)
    /* When there is no change: need to remove the Visual selection */
    redraw_curbuf_later(INVERTED);

  /* Set '[ mark at the start of the formatted area */
  curbuf->b_op_start = oap->start;

  /* For "gw" remember the cursor position and put it back below (adjusted
   * for joined and split lines). */
  if (keep_cursor)
    saved_cursor = oap->cursor_start;

  format_lines(oap->line_count, keep_cursor);

  /*
   * Leave the cursor at the first non-blank of the last formatted line.
   * If the cursor was moved one line back (e.g. with "Q}") go to the next
   * line, so "." will do the next lines.
   */
  if (oap->end_adjusted && curwin->w_cursor.lnum < curbuf->b_ml.ml_line_count)
    ++curwin->w_cursor.lnum;
  beginline(BL_WHITE | BL_FIX);
  old_line_count = curbuf->b_ml.ml_line_count - old_line_count;
  msgmore(old_line_count);

  /* put '] mark on the end of the formatted area */
  curbuf->b_op_end = curwin->w_cursor;

  if (keep_cursor)
  {
    curwin->w_cursor = saved_cursor;
    saved_cursor.lnum = 0;
  }

  if (oap->is_VIsual)
  {
    win_T *wp;

    FOR_ALL_WINDOWS(wp)
    {
      if (wp->w_old_cursor_lnum != 0)
      {
        /* When lines have been inserted or deleted, adjust the end of
         * the Visual area to be redrawn. */
        if (wp->w_old_cursor_lnum > wp->w_old_visual_lnum)
          wp->w_old_cursor_lnum += old_line_count;
        else
          wp->w_old_visual_lnum += old_line_count;
      }
    }
  }
}

#if defined(FEAT_EVAL) || defined(PROTO)
/*
 * Implementation of the format operator 'gq' for when using 'formatexpr'.
 */
void op_formatexpr(oparg_T *oap)
{
  if (oap->is_VIsual)
    /* When there is no change: need to remove the Visual selection */
    redraw_curbuf_later(INVERTED);

  if (fex_format(oap->start.lnum, oap->line_count, NUL) != 0)
    /* As documented: when 'formatexpr' returns non-zero fall back to
     * internal formatting. */
    op_format(oap, FALSE);
}

int fex_format(linenr_T lnum, long count, int c) /* character to be inserted */
{
  int use_sandbox = was_set_insecurely((char_u *)"formatexpr", OPT_LOCAL);
  int r;
  char_u *fex;

  /*
   * Set v:lnum to the first line number and v:count to the number of lines.
   * Set v:char to the character to be inserted (can be NUL).
   */
  set_vim_var_nr(VV_LNUM, lnum);
  set_vim_var_nr(VV_COUNT, count);
  set_vim_var_char(c);

  /* Make a copy, the option could be changed while calling it. */
  fex = vim_strsave(curbuf->b_p_fex);
  if (fex == NULL)
    return 0;

  /*
   * Evaluate the function.
   */
  if (use_sandbox)
    ++sandbox;
  r = (int)eval_to_number(fex);
  if (use_sandbox)
    --sandbox;

  set_vim_var_string(VV_CHAR, NULL, -1);
  vim_free(fex);

  return r;
}
#endif

/*
 * Format "line_count" lines, starting at the cursor position.
 * When "line_count" is negative, format until the end of the paragraph.
 * Lines after the cursor line are saved for undo, caller must have saved the
 * first line.
 */
void format_lines(linenr_T line_count,
                  int avoid_fex) /* don't use 'formatexpr' */
{
  int max_len;
  int is_not_par;              /* current line not part of parag. */
  int next_is_not_par;         /* next line not part of paragraph */
  int is_end_par;              /* at end of paragraph */
  int prev_is_end_par = FALSE; /* prev. line not part of parag. */
  int next_is_start_par = FALSE;
#ifdef FEAT_COMMENTS
  int leader_len = 0;          /* leader len of current line */
  int next_leader_len;         /* leader len of next line */
  char_u *leader_flags = NULL; /* flags for leader of current line */
  char_u *next_leader_flags;   /* flags for leader of next line */
  int do_comments;             /* format comments */
  int do_comments_list = 0;    /* format comments with 'n' or '2' */
#endif
  int advance = TRUE;
  int second_indent = -1; /* indent for second line (comment
                           * aware) */
  int do_second_indent;
  int do_number_indent;
  int do_trail_white;
  int first_par_line = TRUE;
  int smd_save;
  long count;
  int need_set_indent = TRUE; /* set indent of next paragraph */
  int force_format = FALSE;
  int old_State = State;

  /* length of a line to force formatting: 3 * 'tw' */
  max_len = comp_textwidth(TRUE) * 3;

  /* check for 'q', '2' and '1' in 'formatoptions' */
#ifdef FEAT_COMMENTS
  do_comments = has_format_option(FO_Q_COMS);
#endif
  do_second_indent = has_format_option(FO_Q_SECOND);
  do_number_indent = has_format_option(FO_Q_NUMBER);
  do_trail_white = has_format_option(FO_WHITE_PAR);

  /*
   * Get info about the previous and current line.
   */
  if (curwin->w_cursor.lnum > 1)
    is_not_par = fmt_check_par(curwin->w_cursor.lnum - 1
#ifdef FEAT_COMMENTS
                               ,
                               &leader_len, &leader_flags, do_comments
#endif
    );
  else
    is_not_par = TRUE;
  next_is_not_par =
      fmt_check_par(curwin->w_cursor.lnum
#ifdef FEAT_COMMENTS
                    ,
                    &next_leader_len, &next_leader_flags, do_comments
#endif
      );
  is_end_par = (is_not_par || next_is_not_par);
  if (!is_end_par && do_trail_white)
    is_end_par = !ends_in_white(curwin->w_cursor.lnum - 1);

  curwin->w_cursor.lnum--;
  for (count = line_count; count != 0 && !got_int; --count)
  {
    /*
     * Advance to next paragraph.
     */
    if (advance)
    {
      curwin->w_cursor.lnum++;
      prev_is_end_par = is_end_par;
      is_not_par = next_is_not_par;
#ifdef FEAT_COMMENTS
      leader_len = next_leader_len;
      leader_flags = next_leader_flags;
#endif
    }

    /*
     * The last line to be formatted.
     */
    if (count == 1 || curwin->w_cursor.lnum == curbuf->b_ml.ml_line_count)
    {
      next_is_not_par = TRUE;
#ifdef FEAT_COMMENTS
      next_leader_len = 0;
      next_leader_flags = NULL;
#endif
    }
    else
    {
      next_is_not_par =
          fmt_check_par(curwin->w_cursor.lnum + 1
#ifdef FEAT_COMMENTS
                        ,
                        &next_leader_len, &next_leader_flags, do_comments
#endif
          );
      if (do_number_indent)
        next_is_start_par = (get_number_indent(curwin->w_cursor.lnum + 1) > 0);
    }
    advance = TRUE;
    is_end_par = (is_not_par || next_is_not_par || next_is_start_par);
    if (!is_end_par && do_trail_white)
      is_end_par = !ends_in_white(curwin->w_cursor.lnum);

    /*
     * Skip lines that are not in a paragraph.
     */
    if (is_not_par)
    {
      if (line_count < 0)
        break;
    }
    else
    {
      /*
       * For the first line of a paragraph, check indent of second line.
       * Don't do this for comments and empty lines.
       */
      if (first_par_line && (do_second_indent || do_number_indent) &&
          prev_is_end_par &&
          curwin->w_cursor.lnum < curbuf->b_ml.ml_line_count)
      {
        if (do_second_indent && !LINEEMPTY(curwin->w_cursor.lnum + 1))
        {
#ifdef FEAT_COMMENTS
          if (leader_len == 0 && next_leader_len == 0)
          {
            /* no comment found */
#endif
            second_indent = get_indent_lnum(curwin->w_cursor.lnum + 1);
#ifdef FEAT_COMMENTS
          }
          else
          {
            second_indent = next_leader_len;
            do_comments_list = 1;
          }
#endif
        }
        else if (do_number_indent)
        {
#ifdef FEAT_COMMENTS
          if (leader_len == 0 && next_leader_len == 0)
          {
            /* no comment found */
#endif
            second_indent = get_number_indent(curwin->w_cursor.lnum);
#ifdef FEAT_COMMENTS
          }
          else
          {
            /* get_number_indent() is now "comment aware"... */
            second_indent = get_number_indent(curwin->w_cursor.lnum);
            do_comments_list = 1;
          }
#endif
        }
      }

      /*
       * When the comment leader changes, it's the end of the paragraph.
       */
      if (curwin->w_cursor.lnum >= curbuf->b_ml.ml_line_count
#ifdef FEAT_COMMENTS
          || !same_leader(curwin->w_cursor.lnum, leader_len, leader_flags,
                          next_leader_len, next_leader_flags)
#endif
      )
        is_end_par = TRUE;

      /*
       * If we have got to the end of a paragraph, or the line is
       * getting long, format it.
       */
      if (is_end_par || force_format)
      {
        if (need_set_indent)
          /* replace indent in first line with minimal number of
           * tabs and spaces, according to current options */
          (void)set_indent(get_indent(), SIN_CHANGED);

        /* put cursor on last non-space */
        State = NORMAL; /* don't go past end-of-line */
        coladvance((colnr_T)MAXCOL);
        while (curwin->w_cursor.col && vim_isspace(gchar_cursor()))
          dec_cursor();

        /* do the formatting, without 'showmode' */
        State = INSERT; /* for open_line() */
        smd_save = p_smd;
        p_smd = FALSE;
        insertchar(NUL,
                   INSCHAR_FORMAT
#ifdef FEAT_COMMENTS
                       + (do_comments ? INSCHAR_DO_COM : 0) +
                       (do_comments && do_comments_list ? INSCHAR_COM_LIST : 0)
#endif
                       + (avoid_fex ? INSCHAR_NO_FEX : 0),
                   second_indent);
        State = old_State;
        p_smd = smd_save;
        second_indent = -1;
        /* at end of par.: need to set indent of next par. */
        need_set_indent = is_end_par;
        if (is_end_par)
        {
          /* When called with a negative line count, break at the
           * end of the paragraph. */
          if (line_count < 0)
            break;
          first_par_line = TRUE;
        }
        force_format = FALSE;
      }

      /*
       * When still in same paragraph, join the lines together.  But
       * first delete the leader from the second line.
       */
      if (!is_end_par)
      {
        advance = FALSE;
        curwin->w_cursor.lnum++;
        curwin->w_cursor.col = 0;
        if (line_count < 0 && u_save_cursor() == FAIL)
          break;
#ifdef FEAT_COMMENTS
        if (next_leader_len > 0)
        {
          (void)del_bytes((long)next_leader_len, FALSE, FALSE);
          mark_col_adjust(curwin->w_cursor.lnum, (colnr_T)0, 0L,
                          (long)-next_leader_len, 0);
        }
        else
#endif
            if (second_indent > 0) /* the "leader" for FO_Q_SECOND */
        {
          int indent = getwhitecols_curline();

          if (indent > 0)
          {
            (void)del_bytes(indent, FALSE, FALSE);
            mark_col_adjust(curwin->w_cursor.lnum, (colnr_T)0, 0L,
                            (long)-indent, 0);
          }
        }
        curwin->w_cursor.lnum--;
        if (do_join(2, TRUE, FALSE, FALSE, FALSE) == FAIL)
        {
          beep_flush();
          break;
        }
        first_par_line = FALSE;
        /* If the line is getting long, format it next time */
        if (STRLEN(ml_get_curline()) > (size_t)max_len)
          force_format = TRUE;
        else
          force_format = FALSE;
      }
    }
    line_breakcheck();
  }
}

/*
 * Return TRUE if line "lnum" ends in a white character.
 */
static int ends_in_white(linenr_T lnum)
{
  char_u *s = ml_get(lnum);
  size_t l;

  if (*s == NUL)
    return FALSE;
  /* Don't use STRLEN() inside VIM_ISWHITE(), SAS/C complains: "macro
   * invocation may call function multiple times". */
  l = STRLEN(s) - 1;
  return VIM_ISWHITE(s[l]);
}

/*
 * Blank lines, and lines containing only the comment leader, are left
 * untouched by the formatting.  The function returns TRUE in this
 * case.  It also returns TRUE when a line starts with the end of a comment
 * ('e' in comment flags), so that this line is skipped, and not joined to the
 * previous line.  A new paragraph starts after a blank line, or when the
 * comment leader changes -- webb.
 */
#ifdef FEAT_COMMENTS
static int fmt_check_par(linenr_T lnum, int *leader_len, char_u **leader_flags,
                         int do_comments)
{
  char_u *flags = NULL; /* init for GCC */
  char_u *ptr;

  ptr = ml_get(lnum);
  if (do_comments)
    *leader_len = get_leader_len(ptr, leader_flags, FALSE, TRUE);
  else
    *leader_len = 0;

  if (*leader_len > 0)
  {
    /*
     * Search for 'e' flag in comment leader flags.
     */
    flags = *leader_flags;
    while (*flags && *flags != ':' && *flags != COM_END)
      ++flags;
  }

  return (*skipwhite(ptr + *leader_len) == NUL ||
          (*leader_len > 0 && *flags == COM_END) || startPS(lnum, NUL, FALSE));
}
#else
static int fmt_check_par(linenr_T lnum)
{
  return (*skipwhite(ml_get(lnum)) == NUL || startPS(lnum, NUL, FALSE));
}
#endif

/*
 * Return TRUE when a paragraph starts in line "lnum".  Return FALSE when the
 * previous line is in the same paragraph.  Used for auto-formatting.
 */
int paragraph_start(linenr_T lnum)
{
  char_u *p;
#ifdef FEAT_COMMENTS
  int leader_len = 0;          /* leader len of current line */
  char_u *leader_flags = NULL; /* flags for leader of current line */
  int next_leader_len;         /* leader len of next line */
  char_u *next_leader_flags;   /* flags for leader of next line */
  int do_comments;             /* format comments */
#endif

  if (lnum <= 1)
    return TRUE; /* start of the file */

  p = ml_get(lnum - 1);
  if (*p == NUL)
    return TRUE; /* after empty line */

#ifdef FEAT_COMMENTS
  do_comments = has_format_option(FO_Q_COMS);
#endif
  if (fmt_check_par(lnum - 1
#ifdef FEAT_COMMENTS
                    ,
                    &leader_len, &leader_flags, do_comments
#endif
                    ))
    return TRUE; /* after non-paragraph line */

  if (fmt_check_par(lnum
#ifdef FEAT_COMMENTS
                    ,
                    &next_leader_len, &next_leader_flags, do_comments
#endif
                    ))
    return TRUE; /* "lnum" is not a paragraph line */

  if (has_format_option(FO_WHITE_PAR) && !ends_in_white(lnum - 1))
    return TRUE; /* missing trailing space in previous line. */

  if (has_format_option(FO_Q_NUMBER) && (get_number_indent(lnum) > 0))
    return TRUE; /* numbered item starts in "lnum". */

#ifdef FEAT_COMMENTS
  if (!same_leader(lnum - 1, leader_len, leader_flags, next_leader_len,
                   next_leader_flags))
    return TRUE; /* change of comment leader. */
#endif

  return FALSE;
}

/*
 * prepare a few things for block mode yank/delete/tilde
 *
 * for delete:
 * - textlen includes the first/last char to be (partly) deleted
 * - start/endspaces is the number of columns that are taken by the
 *   first/last deleted char minus the number of columns that have to be
 *   deleted.
 * for yank and tilde:
 * - textlen includes the first/last char to be wholly yanked
 * - start/endspaces is the number of columns of the first/last yanked char
 *   that are to be yanked.
 */
static void block_prep(oparg_T *oap, struct block_def *bdp, linenr_T lnum,
                       int is_del)
{
  int incr = 0;
  char_u *pend;
  char_u *pstart;
  char_u *line;
  char_u *prev_pstart;
  char_u *prev_pend;

  bdp->startspaces = 0;
  bdp->endspaces = 0;
  bdp->textlen = 0;
  bdp->start_vcol = 0;
  bdp->end_vcol = 0;
  bdp->is_short = FALSE;
  bdp->is_oneChar = FALSE;
  bdp->pre_whitesp = 0;
  bdp->pre_whitesp_c = 0;
  bdp->end_char_vcols = 0;
  bdp->start_char_vcols = 0;

  line = ml_get(lnum);
  pstart = line;
  prev_pstart = line;
  while (bdp->start_vcol < oap->start_vcol && *pstart)
  {
    /* Count a tab for what it's worth (if list mode not on) */
    incr = lbr_chartabsize(line, pstart, (colnr_T)bdp->start_vcol);
    bdp->start_vcol += incr;
    if (VIM_ISWHITE(*pstart))
    {
      bdp->pre_whitesp += incr;
      bdp->pre_whitesp_c++;
    }
    else
    {
      bdp->pre_whitesp = 0;
      bdp->pre_whitesp_c = 0;
    }
    prev_pstart = pstart;
    MB_PTR_ADV(pstart);
  }
  bdp->start_char_vcols = incr;
  if (bdp->start_vcol < oap->start_vcol) /* line too short */
  {
    bdp->end_vcol = bdp->start_vcol;
    bdp->is_short = TRUE;
    if (!is_del || oap->op_type == OP_APPEND)
      bdp->endspaces = oap->end_vcol - oap->start_vcol + 1;
  }
  else
  {
    /* notice: this converts partly selected Multibyte characters to
     * spaces, too. */
    bdp->startspaces = bdp->start_vcol - oap->start_vcol;
    if (is_del && bdp->startspaces)
      bdp->startspaces = bdp->start_char_vcols - bdp->startspaces;
    pend = pstart;
    bdp->end_vcol = bdp->start_vcol;
    if (bdp->end_vcol > oap->end_vcol) /* it's all in one character */
    {
      bdp->is_oneChar = TRUE;
      if (oap->op_type == OP_INSERT)
        bdp->endspaces = bdp->start_char_vcols - bdp->startspaces;
      else if (oap->op_type == OP_APPEND)
      {
        bdp->startspaces += oap->end_vcol - oap->start_vcol + 1;
        bdp->endspaces = bdp->start_char_vcols - bdp->startspaces;
      }
      else
      {
        bdp->startspaces = oap->end_vcol - oap->start_vcol + 1;
        if (is_del && oap->op_type != OP_LSHIFT)
        {
          /* just putting the sum of those two into
           * bdp->startspaces doesn't work for Visual replace,
           * so we have to split the tab in two */
          bdp->startspaces =
              bdp->start_char_vcols - (bdp->start_vcol - oap->start_vcol);
          bdp->endspaces = bdp->end_vcol - oap->end_vcol - 1;
        }
      }
    }
    else
    {
      prev_pend = pend;
      while (bdp->end_vcol <= oap->end_vcol && *pend != NUL)
      {
        /* Count a tab for what it's worth (if list mode not on) */
        prev_pend = pend;
        incr = lbr_chartabsize_adv(line, &pend, (colnr_T)bdp->end_vcol);
        bdp->end_vcol += incr;
      }
      if (bdp->end_vcol <= oap->end_vcol &&
          (!is_del || oap->op_type == OP_APPEND ||
           oap->op_type == OP_REPLACE)) /* line too short */
      {
        bdp->is_short = TRUE;
        /* Alternative: include spaces to fill up the block.
         * Disadvantage: can lead to trailing spaces when the line is
         * short where the text is put */
        /* if (!is_del || oap->op_type == OP_APPEND) */
        if (oap->op_type == OP_APPEND || virtual_op)
          bdp->endspaces = oap->end_vcol - bdp->end_vcol + oap->inclusive;
        else
          bdp->endspaces = 0; /* replace doesn't add characters */
      }
      else if (bdp->end_vcol > oap->end_vcol)
      {
        bdp->endspaces = bdp->end_vcol - oap->end_vcol - 1;
        if (!is_del && bdp->endspaces)
        {
          bdp->endspaces = incr - bdp->endspaces;
          if (pend != pstart)
            pend = prev_pend;
        }
      }
    }
    bdp->end_char_vcols = incr;
    if (is_del && bdp->startspaces)
      pstart = prev_pstart;
    bdp->textlen = (int)(pend - pstart);
  }
  bdp->textcol = (colnr_T)(pstart - line);
  bdp->textstart = pstart;
}

/*
 * Handle the add/subtract operator.
 */
void op_addsub(oparg_T *oap, linenr_T Prenum1, /* Amount of add/subtract */
               int g_cmd)                      /* was g<c-a>/g<c-x> */
{
  pos_T pos;
  struct block_def bd;
  int change_cnt = 0;
  linenr_T amount = Prenum1;

  // do_addsub() might trigger re-evaluation of 'foldexpr' halfway, when the
  // buffer is not completely updated yet. Postpone updating folds until before
  // the call to changed_lines().
#ifdef FEAT_FOLDING
  disable_fold_update++;
#endif

  if (!VIsual_active)
  {
    pos = curwin->w_cursor;
    if (u_save_cursor() == FAIL)
    {
#ifdef FEAT_FOLDING
      disable_fold_update--;
#endif
      return;
    }
    change_cnt = do_addsub(oap->op_type, &pos, 0, amount);
#ifdef FEAT_FOLDING
    disable_fold_update--;
#endif
    if (change_cnt)
      changed_lines(pos.lnum, 0, pos.lnum + 1, 0L);
  }
  else
  {
    int one_change;
    int length;
    pos_T startpos;

    if (u_save((linenr_T)(oap->start.lnum - 1),
               (linenr_T)(oap->end.lnum + 1)) == FAIL)
    {
#ifdef FEAT_FOLDING
      disable_fold_update--;
#endif
      return;
    }

    pos = oap->start;
    for (; pos.lnum <= oap->end.lnum; ++pos.lnum)
    {
      if (oap->block_mode) /* Visual block mode */
      {
        block_prep(oap, &bd, pos.lnum, FALSE);
        pos.col = bd.textcol;
        length = bd.textlen;
      }
      else if (oap->motion_type == MLINE)
      {
        curwin->w_cursor.col = 0;
        pos.col = 0;
        length = (colnr_T)STRLEN(ml_get(pos.lnum));
      }
      else /* oap->motion_type == MCHAR */
      {
        if (pos.lnum == oap->start.lnum && !oap->inclusive)
          dec(&(oap->end));
        length = (colnr_T)STRLEN(ml_get(pos.lnum));
        pos.col = 0;
        if (pos.lnum == oap->start.lnum)
        {
          pos.col += oap->start.col;
          length -= oap->start.col;
        }
        if (pos.lnum == oap->end.lnum)
        {
          length = (int)STRLEN(ml_get(oap->end.lnum));
          if (oap->end.col >= length)
            oap->end.col = length - 1;
          length = oap->end.col - pos.col + 1;
        }
      }
      one_change = do_addsub(oap->op_type, &pos, length, amount);
      if (one_change)
      {
        /* Remember the start position of the first change. */
        if (change_cnt == 0)
          startpos = curbuf->b_op_start;
        ++change_cnt;
      }

      if (g_cmd && one_change)
        amount += Prenum1;
    }

#ifdef FEAT_FOLDING
    disable_fold_update--;
#endif
    if (change_cnt)
      changed_lines(oap->start.lnum, 0, oap->end.lnum + 1, 0L);

    if (!change_cnt && oap->is_VIsual)
      /* No change: need to remove the Visual selection */
      redraw_curbuf_later(INVERTED);

    /* Set '[ mark if something changed. Keep the last end
     * position from do_addsub(). */
    if (change_cnt > 0)
      curbuf->b_op_start = startpos;

    if (change_cnt > p_report)
      smsg(NGETTEXT("%ld line changed", "%ld lines changed", change_cnt),
           change_cnt);
  }
}

/*
 * Add or subtract 'Prenum1' from a number in a line
 * op_type is OP_NR_ADD or OP_NR_SUB
 *
 * Returns TRUE if some character was changed.
 */
static int do_addsub(int op_type, pos_T *pos, int length, linenr_T Prenum1)
{
  int col;
  char_u *buf1;
  char_u buf2[NUMBUFLEN];
  int pre;                     /* 'X'/'x': hex; '0': octal; 'B'/'b': bin */
  static int hexupper = FALSE; /* 0xABC */
  uvarnumber_T n;
  uvarnumber_T oldn;
  char_u *ptr;
  int c;
  int todel;
  int dohex;
  int dooct;
  int dobin;
  int doalp;
  int firstdigit;
  int subtract;
  int negative = FALSE;
  int was_positive = TRUE;
  int visual = VIsual_active;
  int did_change = FALSE;
  pos_T save_cursor = curwin->w_cursor;
  int maxlen = 0;
  pos_T startpos;
  pos_T endpos;

  dohex = (vim_strchr(curbuf->b_p_nf, 'x') != NULL); /* "heX" */
  dooct = (vim_strchr(curbuf->b_p_nf, 'o') != NULL); /* "Octal" */
  dobin = (vim_strchr(curbuf->b_p_nf, 'b') != NULL); /* "Bin" */
  doalp = (vim_strchr(curbuf->b_p_nf, 'p') != NULL); /* "alPha" */

  curwin->w_cursor = *pos;
  ptr = ml_get(pos->lnum);
  col = pos->col;

  if (*ptr == NUL)
    goto theend;

  /*
   * First check if we are on a hexadecimal number, after the "0x".
   */
  if (!VIsual_active)
  {
    if (dobin)
      while (col > 0 && vim_isbdigit(ptr[col]))
      {
        --col;
        if (has_mbyte)
          col -= (*mb_head_off)(ptr, ptr + col);
      }

    if (dohex)
      while (col > 0 && vim_isxdigit(ptr[col]))
      {
        --col;
        if (has_mbyte)
          col -= (*mb_head_off)(ptr, ptr + col);
      }

    if (dobin && dohex &&
        !((col > 0 && (ptr[col] == 'X' || ptr[col] == 'x') &&
           ptr[col - 1] == '0' &&
           (!has_mbyte || !(*mb_head_off)(ptr, ptr + col - 1)) &&
           vim_isxdigit(ptr[col + 1]))))
    {

      /* In case of binary/hexadecimal pattern overlap match, rescan */

      col = pos->col;

      while (col > 0 && vim_isdigit(ptr[col]))
      {
        col--;
        if (has_mbyte)
          col -= (*mb_head_off)(ptr, ptr + col);
      }
    }

    if ((dohex && col > 0 && (ptr[col] == 'X' || ptr[col] == 'x') &&
         ptr[col - 1] == '0' &&
         (!has_mbyte || !(*mb_head_off)(ptr, ptr + col - 1)) &&
         vim_isxdigit(ptr[col + 1])) ||
        (dobin && col > 0 && (ptr[col] == 'B' || ptr[col] == 'b') &&
         ptr[col - 1] == '0' &&
         (!has_mbyte || !(*mb_head_off)(ptr, ptr + col - 1)) &&
         vim_isbdigit(ptr[col + 1])))
    {
      /* Found hexadecimal or binary number, move to its start. */
      --col;
      if (has_mbyte)
        col -= (*mb_head_off)(ptr, ptr + col);
    }
    else
    {
      /*
       * Search forward and then backward to find the start of number.
       */
      col = pos->col;

      while (ptr[col] != NUL && !vim_isdigit(ptr[col]) &&
             !(doalp && ASCII_ISALPHA(ptr[col])))
        col += MB_PTR2LEN(ptr + col);

      while (col > 0 && vim_isdigit(ptr[col - 1]) &&
             !(doalp && ASCII_ISALPHA(ptr[col])))
      {
        --col;
        if (has_mbyte)
          col -= (*mb_head_off)(ptr, ptr + col);
      }
    }
  }

  if (visual)
  {
    while (ptr[col] != NUL && length > 0 && !vim_isdigit(ptr[col]) &&
           !(doalp && ASCII_ISALPHA(ptr[col])))
    {
      int mb_len = MB_PTR2LEN(ptr + col);

      col += mb_len;
      length -= mb_len;
    }

    if (length == 0)
      goto theend;

    if (col > pos->col && ptr[col - 1] == '-' &&
        (!has_mbyte || !(*mb_head_off)(ptr, ptr + col - 1)))
    {
      negative = TRUE;
      was_positive = FALSE;
    }
  }

  /*
   * If a number was found, and saving for undo works, replace the number.
   */
  firstdigit = ptr[col];
  if (!VIM_ISDIGIT(firstdigit) && !(doalp && ASCII_ISALPHA(firstdigit)))
  {
    beep_flush();
    goto theend;
  }

  if (doalp && ASCII_ISALPHA(firstdigit))
  {
    /* decrement or increment alphabetic character */
    if (op_type == OP_NR_SUB)
    {
      if (CharOrd(firstdigit) < Prenum1)
      {
        if (isupper(firstdigit))
          firstdigit = 'A';
        else
          firstdigit = 'a';
      }
      else
#ifdef EBCDIC
        firstdigit = EBCDIC_CHAR_ADD(firstdigit, -Prenum1);
#else
        firstdigit -= Prenum1;
#endif
    }
    else
    {
      if (26 - CharOrd(firstdigit) - 1 < Prenum1)
      {
        if (isupper(firstdigit))
          firstdigit = 'Z';
        else
          firstdigit = 'z';
      }
      else
#ifdef EBCDIC
        firstdigit = EBCDIC_CHAR_ADD(firstdigit, Prenum1);
#else
        firstdigit += Prenum1;
#endif
    }
    curwin->w_cursor.col = col;
    if (!did_change)
      startpos = curwin->w_cursor;
    did_change = TRUE;
    (void)del_char(FALSE);
    ins_char(firstdigit);
    endpos = curwin->w_cursor;
    curwin->w_cursor.col = col;
  }
  else
  {
    if (col > 0 && ptr[col - 1] == '-' &&
        (!has_mbyte || !(*mb_head_off)(ptr, ptr + col - 1)) && !visual)
    {
      /* negative number */
      --col;
      negative = TRUE;
    }
    /* get the number value (unsigned) */
    if (visual && VIsual_mode != 'V')
      maxlen = (curbuf->b_visual.vi_curswant == MAXCOL ? (int)STRLEN(ptr) - col
                                                       : length);

    vim_str2nr(ptr + col, &pre, &length,
               0 + (dobin ? STR2NR_BIN : 0) + (dooct ? STR2NR_OCT : 0) +
                   (dohex ? STR2NR_HEX : 0),
               NULL, &n, maxlen, FALSE);

    /* ignore leading '-' for hex and octal and bin numbers */
    if (pre && negative)
    {
      ++col;
      --length;
      negative = FALSE;
    }
    /* add or subtract */
    subtract = FALSE;
    if (op_type == OP_NR_SUB)
      subtract ^= TRUE;
    if (negative)
      subtract ^= TRUE;

    oldn = n;
    if (subtract)
      n -= (uvarnumber_T)Prenum1;
    else
      n += (uvarnumber_T)Prenum1;
    /* handle wraparound for decimal numbers */
    if (!pre)
    {
      if (subtract)
      {
        if (n > oldn)
        {
          n = 1 + (n ^ (uvarnumber_T)-1);
          negative ^= TRUE;
        }
      }
      else
      {
        /* add */
        if (n < oldn)
        {
          n = (n ^ (uvarnumber_T)-1);
          negative ^= TRUE;
        }
      }
      if (n == 0)
        negative = FALSE;
    }

    if (visual && !was_positive && !negative && col > 0)
    {
      /* need to remove the '-' */
      col--;
      length++;
    }

    /*
     * Delete the old number.
     */
    curwin->w_cursor.col = col;
    if (!did_change)
      startpos = curwin->w_cursor;
    did_change = TRUE;
    todel = length;
    c = gchar_cursor();
    /*
     * Don't include the '-' in the length, only the length of the
     * part after it is kept the same.
     */
    if (c == '-')
      --length;
    while (todel-- > 0)
    {
      if (c < 0x100 && isalpha(c))
      {
        if (isupper(c))
          hexupper = TRUE;
        else
          hexupper = FALSE;
      }
      /* del_char() will mark line needing displaying */
      (void)del_char(FALSE);
      c = gchar_cursor();
    }

    /*
     * Prepare the leading characters in buf1[].
     * When there are many leading zeros it could be very long.
     * Allocate a bit too much.
     */
    buf1 = alloc(length + NUMBUFLEN);
    if (buf1 == NULL)
      goto theend;
    ptr = buf1;
    if (negative && (!visual || was_positive))
      *ptr++ = '-';
    if (pre)
    {
      *ptr++ = '0';
      --length;
    }
    if (pre == 'b' || pre == 'B' || pre == 'x' || pre == 'X')
    {
      *ptr++ = pre;
      --length;
    }

    /*
     * Put the number characters in buf2[].
     */
    if (pre == 'b' || pre == 'B')
    {
      int i;
      int bit = 0;
      int bits = sizeof(uvarnumber_T) * 8;

      /* leading zeros */
      for (bit = bits; bit > 0; bit--)
        if ((n >> (bit - 1)) & 0x1)
          break;

      for (i = 0; bit > 0; bit--)
        buf2[i++] = ((n >> (bit - 1)) & 0x1) ? '1' : '0';

      buf2[i] = '\0';
    }
    else if (pre == 0)
      vim_snprintf((char *)buf2, NUMBUFLEN, "%llu", (long_long_u_T)n);
    else if (pre == '0')
      vim_snprintf((char *)buf2, NUMBUFLEN, "%llo", (long_long_u_T)n);
    else if (pre && hexupper)
      vim_snprintf((char *)buf2, NUMBUFLEN, "%llX", (long_long_u_T)n);
    else
      vim_snprintf((char *)buf2, NUMBUFLEN, "%llx", (long_long_u_T)n);
    length -= (int)STRLEN(buf2);

    /*
     * Adjust number of zeros to the new number of digits, so the
     * total length of the number remains the same.
     * Don't do this when
     * the result may look like an octal number.
     */
    if (firstdigit == '0' && !(dooct && pre == 0))
      while (length-- > 0)
        *ptr++ = '0';
    *ptr = NUL;
    STRCAT(buf1, buf2);
    ins_str(buf1); /* insert the new number */
    vim_free(buf1);
    endpos = curwin->w_cursor;
    if (did_change && curwin->w_cursor.col)
      --curwin->w_cursor.col;
  }

  if (did_change)
  {
    /* set the '[ and '] marks */
    curbuf->b_op_start = startpos;
    curbuf->b_op_end = endpos;
    if (curbuf->b_op_end.col > 0)
      --curbuf->b_op_end.col;
  }

theend:
  if (visual)
    curwin->w_cursor = save_cursor;
  else if (did_change)
    curwin->w_set_curswant = TRUE;

  return did_change;
}

#ifdef FEAT_VIMINFO

static yankreg_T *y_read_regs = NULL;

#define REG_PREVIOUS 1
#define REG_EXEC 2

/*
 * Prepare for reading viminfo registers when writing viminfo later.
 */
void prepare_viminfo_registers(void)
{
  y_read_regs = ALLOC_CLEAR_MULT(yankreg_T, NUM_REGISTERS);
}

void finish_viminfo_registers(void)
{
  int i;
  int j;

  if (y_read_regs != NULL)
  {
    for (i = 0; i < NUM_REGISTERS; ++i)
      if (y_read_regs[i].y_array != NULL)
      {
        for (j = 0; j < y_read_regs[i].y_size; j++)
          vim_free(y_read_regs[i].y_array[j]);
        vim_free(y_read_regs[i].y_array);
      }
    VIM_CLEAR(y_read_regs);
  }
}

int read_viminfo_register(vir_T *virp, int force)
{
  int eof;
  int do_it = TRUE;
  int size;
  int limit;
  int i;
  int set_prev = FALSE;
  char_u *str;
  char_u **array = NULL;
  int new_type = MCHAR;  /* init to shut up compiler */
  colnr_T new_width = 0; /* init to shut up compiler */

  /* We only get here (hopefully) if line[0] == '"' */
  str = virp->vir_line + 1;

  /* If the line starts with "" this is the y_previous register. */
  if (*str == '"')
  {
    set_prev = TRUE;
    str++;
  }

  if (!ASCII_ISALNUM(*str) && *str != '-')
  {
    if (viminfo_error("E577: ", _("Illegal register name"), virp->vir_line))
      return TRUE; /* too many errors, pretend end-of-file */
    do_it = FALSE;
  }
  get_yank_register(*str++, FALSE);
  if (!force && y_current->y_array != NULL)
    do_it = FALSE;

  if (*str == '@')
  {
    /* "x@: register x used for @@ */
    if (force || execreg_lastc == NUL)
      execreg_lastc = str[-1];
  }

  size = 0;
  limit = 100; /* Optimized for registers containing <= 100 lines */
  if (do_it)
  {
    /*
     * Build the new register in array[].
     * y_array is kept as-is until done.
     * The "do_it" flag is reset when something is wrong, in which case
     * array[] needs to be freed.
     */
    if (set_prev)
      y_previous = y_current;
    array = ALLOC_MULT(char_u *, limit);
    str = skipwhite(skiptowhite(str));
    if (STRNCMP(str, "CHAR", 4) == 0)
      new_type = MCHAR;
    else if (STRNCMP(str, "BLOCK", 5) == 0)
      new_type = MBLOCK;
    else
      new_type = MLINE;
    /* get the block width; if it's missing we get a zero, which is OK */
    str = skipwhite(skiptowhite(str));
    new_width = getdigits(&str);
  }

  while (!(eof = viminfo_readline(virp)) &&
         (virp->vir_line[0] == TAB || virp->vir_line[0] == '<'))
  {
    if (do_it)
    {
      if (size == limit)
      {
        char_u **new_array = (char_u **)alloc(limit * 2 * sizeof(char_u *));

        if (new_array == NULL)
        {
          do_it = FALSE;
          break;
        }
        for (i = 0; i < limit; i++)
          new_array[i] = array[i];
        vim_free(array);
        array = new_array;
        limit *= 2;
      }
      str = viminfo_readstring(virp, 1, TRUE);
      if (str != NULL)
        array[size++] = str;
      else
        /* error, don't store the result */
        do_it = FALSE;
    }
  }

  if (do_it)
  {
    /* free y_array[] */
    for (i = 0; i < y_current->y_size; i++)
      vim_free(y_current->y_array[i]);
    vim_free(y_current->y_array);

    y_current->y_type = new_type;
    y_current->y_width = new_width;
    y_current->y_size = size;
    y_current->y_time_set = 0;
    if (size == 0)
    {
      y_current->y_array = NULL;
    }
    else
    {
      /* Move the lines from array[] to y_array[]. */
      y_current->y_array = ALLOC_MULT(char_u *, size);
      for (i = 0; i < size; i++)
      {
        if (y_current->y_array == NULL)
          vim_free(array[i]);
        else
          y_current->y_array[i] = array[i];
      }
    }
  }
  else
  {
    /* Free array[] if it was filled. */
    for (i = 0; i < size; i++)
      vim_free(array[i]);
  }
  vim_free(array);

  return eof;
}

/*
 * Accept a new style register line from the viminfo, store it when it's new.
 */
void handle_viminfo_register(garray_T *values, int force)
{
  bval_T *vp = (bval_T *)values->ga_data;
  int flags;
  int name;
  int type;
  int linecount;
  int width;
  time_t timestamp;
  yankreg_T *y_ptr;
  int i;

  /* Check the format:
   * |{bartype},{flags},{name},{type},
   *      {linecount},{width},{timestamp},"line1","line2"
   */
  if (values->ga_len < 6 || vp[0].bv_type != BVAL_NR ||
      vp[1].bv_type != BVAL_NR || vp[2].bv_type != BVAL_NR ||
      vp[3].bv_type != BVAL_NR || vp[4].bv_type != BVAL_NR ||
      vp[5].bv_type != BVAL_NR)
    return;
  flags = vp[0].bv_nr;
  name = vp[1].bv_nr;
  if (name < 0 || name >= NUM_REGISTERS)
    return;
  type = vp[2].bv_nr;
  if (type != MCHAR && type != MLINE && type != MBLOCK)
    return;
  linecount = vp[3].bv_nr;
  if (values->ga_len < 6 + linecount)
    return;
  width = vp[4].bv_nr;
  if (width < 0)
    return;

  if (y_read_regs != NULL)
    /* Reading viminfo for merging and writing.  Store the register
     * content, don't update the current registers. */
    y_ptr = &y_read_regs[name];
  else
    y_ptr = &y_regs[name];

  /* Do not overwrite unless forced or the timestamp is newer. */
  timestamp = (time_t)vp[5].bv_nr;
  if (y_ptr->y_array != NULL && !force &&
      (timestamp == 0 || y_ptr->y_time_set > timestamp))
    return;

  if (y_ptr->y_array != NULL)
    for (i = 0; i < y_ptr->y_size; i++)
      vim_free(y_ptr->y_array[i]);
  vim_free(y_ptr->y_array);

  if (y_read_regs == NULL)
  {
    if (flags & REG_PREVIOUS)
      y_previous = y_ptr;
    if ((flags & REG_EXEC) && (force || execreg_lastc == NUL))
      execreg_lastc = get_register_name(name);
  }
  y_ptr->y_type = type;
  y_ptr->y_width = width;
  y_ptr->y_size = linecount;
  y_ptr->y_time_set = timestamp;
  if (linecount == 0)
  {
    y_ptr->y_array = NULL;
    return;
  }
  y_ptr->y_array = ALLOC_MULT(char_u *, linecount);
  if (y_ptr->y_array == NULL)
  {
    y_ptr->y_size = 0; // ensure object state is consistent
    return;
  }
  for (i = 0; i < linecount; i++)
  {
    if (vp[i + 6].bv_allocated)
    {
      y_ptr->y_array[i] = vp[i + 6].bv_string;
      vp[i + 6].bv_string = NULL;
    }
    else
      y_ptr->y_array[i] = vim_strsave(vp[i + 6].bv_string);
  }
}

void write_viminfo_registers(FILE *fp)
{
  int i, j;
  char_u *type;
  char_u c;
  int num_lines;
  int max_num_lines;
  int max_kbyte;
  long len;
  yankreg_T *y_ptr;

  fputs(_("\n# Registers:\n"), fp);

  /* Get '<' value, use old '"' value if '<' is not found. */
  max_num_lines = get_viminfo_parameter('<');
  if (max_num_lines < 0)
    max_num_lines = get_viminfo_parameter('"');
  if (max_num_lines == 0)
    return;
  max_kbyte = get_viminfo_parameter('s');
  if (max_kbyte == 0)
    return;

  for (i = 0; i < NUM_REGISTERS; i++)
  {
    /* Skip '*'/'+' register, we don't want them back next time */
    if (i == STAR_REGISTER || i == PLUS_REGISTER)
      continue;
    /* When reading viminfo for merging and writing: Use the register from
     * viminfo if it's newer. */
    if (y_read_regs != NULL && y_read_regs[i].y_array != NULL &&
        (y_regs[i].y_array == NULL ||
         y_read_regs[i].y_time_set > y_regs[i].y_time_set))
      y_ptr = &y_read_regs[i];
    else if (y_regs[i].y_array == NULL)
      continue;
    else
      y_ptr = &y_regs[i];

    /* Skip empty registers. */
    num_lines = y_ptr->y_size;
    if (num_lines == 0 ||
        (num_lines == 1 && y_ptr->y_type == MCHAR && *y_ptr->y_array[0] == NUL))
      continue;

    if (max_kbyte > 0)
    {
      /* Skip register if there is more text than the maximum size. */
      len = 0;
      for (j = 0; j < num_lines; j++)
        len += (long)STRLEN(y_ptr->y_array[j]) + 1L;
      if (len > (long)max_kbyte * 1024L)
        continue;
    }

    switch (y_ptr->y_type)
    {
    case MLINE:
      type = (char_u *)"LINE";
      break;
    case MCHAR:
      type = (char_u *)"CHAR";
      break;
    case MBLOCK:
      type = (char_u *)"BLOCK";
      break;
    default:
      semsg(_("E574: Unknown register type %d"), y_ptr->y_type);
      type = (char_u *)"LINE";
      break;
    }
    if (y_previous == &y_regs[i])
      fprintf(fp, "\"");
    c = get_register_name(i);
    fprintf(fp, "\"%c", c);
    if (c == execreg_lastc)
      fprintf(fp, "@");
    fprintf(fp, "\t%s\t%d\n", type, (int)y_ptr->y_width);

    /* If max_num_lines < 0, then we save ALL the lines in the register */
    if (max_num_lines > 0 && num_lines > max_num_lines)
      num_lines = max_num_lines;
    for (j = 0; j < num_lines; j++)
    {
      putc('\t', fp);
      viminfo_writestring(fp, y_ptr->y_array[j]);
    }

    {
      int flags = 0;
      int remaining;

      /* New style with a bar line. Format:
       * |{bartype},{flags},{name},{type},
       *      {linecount},{width},{timestamp},"line1","line2"
       * flags: REG_PREVIOUS - register is y_previous
       *	      REG_EXEC - used for @@
       */
      if (y_previous == &y_regs[i])
        flags |= REG_PREVIOUS;
      if (c == execreg_lastc)
        flags |= REG_EXEC;
      fprintf(fp, "|%d,%d,%d,%d,%d,%d,%ld", BARTYPE_REGISTER, flags, i,
              y_ptr->y_type, num_lines, (int)y_ptr->y_width,
              (long)y_ptr->y_time_set);
      /* 11 chars for type/flags/name/type, 3 * 20 for numbers */
      remaining = LSIZE - 71;
      for (j = 0; j < num_lines; j++)
      {
        putc(',', fp);
        --remaining;
        remaining = barline_writestring(fp, y_ptr->y_array[j], remaining);
      }
      putc('\n', fp);
    }
  }
}
#endif /* FEAT_VIMINFO */

#if defined(FEAT_EVAL) || defined(PROTO)
/*
 * Return the type of a register.
 * Used for getregtype()
 * Returns MAUTO for error.
 */
char_u get_reg_type(int regname, long *reglen)
{
  switch (regname)
  {
  case '%': /* file name */
  case '#': /* alternate file name */
  case '=': /* expression */
  case ':': /* last command line */
  case '/': /* last search-pattern */
  case '.': /* last inserted text */
#ifdef FEAT_SEARCHPATH
  case Ctrl_F: /* Filename under cursor */
  case Ctrl_P: /* Path under cursor, expand via "path" */
#endif
  case Ctrl_W: /* word under cursor */
  case Ctrl_A: /* WORD (mnemonic All) under cursor */
  case '_':    /* black hole: always empty */
    return MCHAR;
  }

  if (regname != NUL && !valid_yank_reg(regname, FALSE))
    return MAUTO;

  get_yank_register(regname, FALSE);

  if (y_current->y_array != NULL)
  {
    if (reglen != NULL && y_current->y_type == MBLOCK)
      *reglen = y_current->y_width;
    return y_current->y_type;
  }
  return MAUTO;
}

/*
 * When "flags" has GREG_LIST return a list with text "s".
 * Otherwise just return "s".
 */
static char_u *getreg_wrap_one_line(char_u *s, int flags)
{
  if (flags & GREG_LIST)
  {
    list_T *list = list_alloc();

    if (list != NULL)
    {
      if (list_append_string(list, NULL, -1) == FAIL)
      {
        list_free(list);
        return NULL;
      }
      list->lv_first->li_tv.vval.v_string = s;
    }
    return (char_u *)list;
  }
  return s;
}

/*
 * Return the contents of a register as a single allocated string.
 * Used for "@r" in expressions and for getreg().
 * Returns NULL for error.
 * Flags:
 *	GREG_NO_EXPR	Do not allow expression register
 *	GREG_EXPR_SRC	For the expression register: return expression itself,
 *			not the result of its evaluation.
 *	GREG_LIST	Return a list of lines in place of a single string.
 */
char_u *get_reg_contents(int regname, int flags)
{
  long i;
  char_u *retval;
  int allocated;
  long len;

  /* Don't allow using an expression register inside an expression */
  if (regname == '=')
  {
    if (flags & GREG_NO_EXPR)
      return NULL;
    if (flags & GREG_EXPR_SRC)
      return getreg_wrap_one_line(get_expr_line_src(), flags);
    return getreg_wrap_one_line(get_expr_line(), flags);
  }

  if (regname == '@') /* "@@" is used for unnamed register */
    regname = '"';

  /* check for valid regname */
  if (regname != NUL && !valid_yank_reg(regname, FALSE))
    return NULL;

  if (get_spec_reg(regname, &retval, &allocated, FALSE))
  {
    if (retval == NULL)
      return NULL;
    if (allocated)
      return getreg_wrap_one_line(retval, flags);
    return getreg_wrap_one_line(vim_strsave(retval), flags);
  }

  get_yank_register(regname, FALSE);
  if (y_current->y_array == NULL)
    return NULL;

  if (flags & GREG_LIST)
  {
    list_T *list = list_alloc();
    int error = FALSE;

    if (list == NULL)
      return NULL;
    for (i = 0; i < y_current->y_size; ++i)
      if (list_append_string(list, y_current->y_array[i], -1) == FAIL)
        error = TRUE;
    if (error)
    {
      list_free(list);
      return NULL;
    }
    return (char_u *)list;
  }

  /*
   * Compute length of resulting string.
   */
  len = 0;
  for (i = 0; i < y_current->y_size; ++i)
  {
    len += (long)STRLEN(y_current->y_array[i]);
    /*
     * Insert a newline between lines and after last line if
     * y_type is MLINE.
     */
    if (y_current->y_type == MLINE || i < y_current->y_size - 1)
      ++len;
  }

  retval = alloc(len + 1);

  /*
   * Copy the lines of the yank register into the string.
   */
  if (retval != NULL)
  {
    len = 0;
    for (i = 0; i < y_current->y_size; ++i)
    {
      STRCPY(retval + len, y_current->y_array[i]);
      len += (long)STRLEN(retval + len);

      /*
       * Insert a NL between lines and after the last line if y_type is
       * MLINE.
       */
      if (y_current->y_type == MLINE || i < y_current->y_size - 1)
        retval[len++] = '\n';
    }
    retval[len] = NUL;
  }

  return retval;
}

static int init_write_reg(int name, yankreg_T **old_y_previous,
                          yankreg_T **old_y_current, int must_append,
                          int *yank_type UNUSED)
{
  if (!valid_yank_reg(name, TRUE)) /* check for valid reg name */
  {
    emsg_invreg(name);
    return FAIL;
  }

  /* Don't want to change the current (unnamed) register */
  *old_y_previous = y_previous;
  *old_y_current = y_current;

  get_yank_register(name, TRUE);
  if (!y_append && !must_append)
    free_yank_all();
  return OK;
}

static void finish_write_reg(int name, yankreg_T *old_y_previous,
                             yankreg_T *old_y_current)
{
  /* ':let @" = "val"' should change the meaning of the "" register */
  if (name != '"')
    y_previous = old_y_previous;
  y_current = old_y_current;
}

/*
 * Store string "str" in register "name".
 * "maxlen" is the maximum number of bytes to use, -1 for all bytes.
 * If "must_append" is TRUE, always append to the register.  Otherwise append
 * if "name" is an uppercase letter.
 * Note: "maxlen" and "must_append" don't work for the "/" register.
 * Careful: 'str' is modified, you may have to use a copy!
 * If "str" ends in '\n' or '\r', use linewise, otherwise use characterwise.
 */
void write_reg_contents(int name, char_u *str, int maxlen, int must_append)
{
  write_reg_contents_ex(name, str, maxlen, must_append, MAUTO, 0L);
}

void write_reg_contents_lst(int name, char_u **strings, int maxlen UNUSED,
                            int must_append, int yank_type, long block_len)
{
  yankreg_T *old_y_previous, *old_y_current;

  if (name == '/'
#ifdef FEAT_EVAL
      || name == '='
#endif
  )
  {
    char_u *s;

    if (strings[0] == NULL)
      s = (char_u *)"";
    else if (strings[1] != NULL)
    {
      emsg(_("E883: search pattern and expression register may not "
             "contain two or more lines"));
      return;
    }
    else
      s = strings[0];
    write_reg_contents_ex(name, s, -1, must_append, yank_type, block_len);
    return;
  }

  if (name == '_') /* black hole: nothing to do */
    return;

  if (init_write_reg(name, &old_y_previous, &old_y_current, must_append,
                     &yank_type) == FAIL)
    return;

  str_to_reg(y_current, yank_type, (char_u *)strings, -1, block_len, TRUE);

  finish_write_reg(name, old_y_previous, old_y_current);
}

void write_reg_contents_ex(int name, char_u *str, int maxlen, int must_append,
                           int yank_type, long block_len)
{
  yankreg_T *old_y_previous, *old_y_current;
  long len;

  if (maxlen >= 0)
    len = maxlen;
  else
    len = (long)STRLEN(str);

  /* Special case: '/' search pattern */
  if (name == '/')
  {
    set_last_search_pat(str, RE_SEARCH, TRUE, TRUE);
    return;
  }

  if (name == '#')
  {
    buf_T *buf;

    if (VIM_ISDIGIT(*str))
    {
      int num = atoi((char *)str);

      buf = buflist_findnr(num);
      if (buf == NULL)
        semsg(_(e_nobufnr), (long)num);
    }
    else
      buf = buflist_findnr(
          buflist_findpat(str, str + STRLEN(str), TRUE, FALSE, FALSE));
    if (buf == NULL)
      return;
    curwin->w_alt_fnum = buf->b_fnum;
    return;
  }

#ifdef FEAT_EVAL
  if (name == '=')
  {
    char_u *p, *s;

    p = vim_strnsave(str, (int)len);
    if (p == NULL)
      return;
    if (must_append)
    {
      s = concat_str(get_expr_line_src(), p);
      vim_free(p);
      p = s;
    }
    set_expr_line(p);
    return;
  }
#endif

  if (name == '_') /* black hole: nothing to do */
    return;

  if (init_write_reg(name, &old_y_previous, &old_y_current, must_append,
                     &yank_type) == FAIL)
    return;

  str_to_reg(y_current, yank_type, str, len, block_len, FALSE);

  finish_write_reg(name, old_y_previous, old_y_current);
}
#endif /* FEAT_EVAL */

/*
 * Put a string into a register.  When the register is not empty, the string
 * is appended.
 */
static void str_to_reg(yankreg_T *y_ptr, /* pointer to yank register */
                       int yank_type,    /* MCHAR, MLINE, MBLOCK, MAUTO */
                       char_u *str,      /* string to put in register */
                       long len,         /* length of string */
                       long blocklen,    /* width of Visual block */
                       int str_list)     /* TRUE if str is char_u ** */
{
  int type; /* MCHAR, MLINE or MBLOCK */
  int lnum;
  long start;
  long i;
  int extra;
  int newlines;       /* number of lines added */
  int extraline = 0;  /* extra line at the end */
  int append = FALSE; /* append to last line in register */
  char_u *s;
  char_u **ss;
  char_u **pp;
  long maxlen;

  if (y_ptr->y_array == NULL) /* NULL means empty register */
    y_ptr->y_size = 0;

  if (yank_type == MAUTO)
    type =
        ((str_list || (len > 0 && (str[len - 1] == NL || str[len - 1] == CAR)))
             ? MLINE
             : MCHAR);
  else
    type = yank_type;

  /*
   * Count the number of lines within the string
   */
  newlines = 0;
  if (str_list)
  {
    for (ss = (char_u **)str; *ss != NULL; ++ss)
      ++newlines;
  }
  else
  {
    for (i = 0; i < len; i++)
      if (str[i] == '\n')
        ++newlines;
    if (type == MCHAR || len == 0 || str[len - 1] != '\n')
    {
      extraline = 1;
      ++newlines; /* count extra newline at the end */
    }
    if (y_ptr->y_size > 0 && y_ptr->y_type == MCHAR)
    {
      append = TRUE;
      --newlines; /* uncount newline when appending first line */
    }
  }

  /* Without any lines make the register empty. */
  if (y_ptr->y_size + newlines == 0)
  {
    VIM_CLEAR(y_ptr->y_array);
    return;
  }

  /*
   * Allocate an array to hold the pointers to the new register lines.
   * If the register was not empty, move the existing lines to the new array.
   */
  pp = lalloc_clear((y_ptr->y_size + newlines) * sizeof(char_u *), TRUE);
  if (pp == NULL) /* out of memory */
    return;
  for (lnum = 0; lnum < y_ptr->y_size; ++lnum)
    pp[lnum] = y_ptr->y_array[lnum];
  vim_free(y_ptr->y_array);
  y_ptr->y_array = pp;
  maxlen = 0;

  /*
   * Find the end of each line and save it into the array.
   */
  if (str_list)
  {
    for (ss = (char_u **)str; *ss != NULL; ++ss, ++lnum)
    {
      i = (long)STRLEN(*ss);
      pp[lnum] = vim_strnsave(*ss, i);
      if (i > maxlen)
        maxlen = i;
    }
  }
  else
  {
    for (start = 0; start < len + extraline; start += i + 1)
    {
      for (i = start; i < len; ++i) /* find the end of the line */
        if (str[i] == '\n')
          break;
      i -= start; /* i is now length of line */
      if (i > maxlen)
        maxlen = i;
      if (append)
      {
        --lnum;
        extra = (int)STRLEN(y_ptr->y_array[lnum]);
      }
      else
        extra = 0;
      s = alloc(i + extra + 1);
      if (s == NULL)
        break;
      if (extra)
        mch_memmove(s, y_ptr->y_array[lnum], (size_t)extra);
      if (append)
        vim_free(y_ptr->y_array[lnum]);
      if (i)
        mch_memmove(s + extra, str + start, (size_t)i);
      extra += i;
      s[extra] = NUL;
      y_ptr->y_array[lnum++] = s;
      while (--extra >= 0)
      {
        if (*s == NUL)
          *s = '\n'; /* replace NUL with newline */
        ++s;
      }
      append = FALSE; /* only first line is appended */
    }
  }
  y_ptr->y_type = type;
  y_ptr->y_size = lnum;
  if (type == MBLOCK)
    y_ptr->y_width = (blocklen < 0 ? maxlen - 1 : blocklen);
  else
    y_ptr->y_width = 0;
#ifdef FEAT_VIMINFO
  y_ptr->y_time_set = vim_time();
#endif
}

void clear_oparg(oparg_T *oap)
{
  vim_memset(oap, 0, sizeof(oparg_T));
}

/*
 *  Count the number of bytes, characters and "words" in a line.
 *
 *  "Words" are counted by looking for boundaries between non-space and
 *  space characters.  (it seems to produce results that match 'wc'.)
 *
 *  Return value is byte count; word count for the line is added to "*wc".
 *  Char count is added to "*cc".
 *
 *  The function will only examine the first "limit" characters in the
 *  line, stopping if it encounters an end-of-line (NUL byte).  In that
 *  case, eol_size will be added to the character count to account for
 *  the size of the EOL character.
 */
static varnumber_T line_count_info(char_u *line, varnumber_T *wc,
                                   varnumber_T *cc, varnumber_T limit,
                                   int eol_size)
{
  varnumber_T i;
  varnumber_T words = 0;
  varnumber_T chars = 0;
  int is_word = 0;

  for (i = 0; i < limit && line[i] != NUL;)
  {
    if (is_word)
    {
      if (vim_isspace(line[i]))
      {
        words++;
        is_word = 0;
      }
    }
    else if (!vim_isspace(line[i]))
      is_word = 1;
    ++chars;
    i += (*mb_ptr2len)(line + i);
  }

  if (is_word)
    words++;
  *wc += words;

  /* Add eol_size if the end of line was reached before hitting limit. */
  if (i < limit && line[i] == NUL)
  {
    i += eol_size;
    chars += eol_size;
  }
  *cc += chars;
  return i;
}

/*
 * Give some info about the position of the cursor (for "g CTRL-G").
 * In Visual mode, give some info about the selected region.  (In this case,
 * the *_count_cursor variables store running totals for the selection.)
 * When "dict" is not NULL store the info there instead of showing it.
 */
void cursor_pos_info(dict_T *dict)
{
  char_u *p;
  char_u buf1[50];
  char_u buf2[40];
  linenr_T lnum;
  varnumber_T byte_count = 0;
  varnumber_T bom_count = 0;
  varnumber_T byte_count_cursor = 0;
  varnumber_T char_count = 0;
  varnumber_T char_count_cursor = 0;
  varnumber_T word_count = 0;
  varnumber_T word_count_cursor = 0;
  int eol_size;
  varnumber_T last_check = 100000L;
  long line_count_selected = 0;
  pos_T min_pos, max_pos;
  oparg_T oparg;
  struct block_def bd;

  /*
   * Compute the length of the file in characters.
   */
  if (curbuf->b_ml.ml_flags & ML_EMPTY)
  {
    if (dict == NULL)
    {
      msg(_(no_lines_msg));
      return;
    }
  }
  else
  {
    if (get_fileformat(curbuf) == EOL_DOS)
      eol_size = 2;
    else
      eol_size = 1;

    if (VIsual_active)
    {
      if (LT_POS(VIsual, curwin->w_cursor))
      {
        min_pos = VIsual;
        max_pos = curwin->w_cursor;
      }
      else
      {
        min_pos = curwin->w_cursor;
        max_pos = VIsual;
      }
      if (*p_sel == 'e' && max_pos.col > 0)
        --max_pos.col;

      if (VIsual_mode == Ctrl_V)
      {
#ifdef FEAT_LINEBREAK
        char_u *saved_sbr = p_sbr;

        /* Make 'sbr' empty for a moment to get the correct size. */
        p_sbr = empty_option;
#endif
        oparg.is_VIsual = 1;
        oparg.block_mode = TRUE;
        oparg.op_type = OP_NOP;
        getvcols(curwin, &min_pos, &max_pos, &oparg.start_vcol,
                 &oparg.end_vcol);
#ifdef FEAT_LINEBREAK
        p_sbr = saved_sbr;
#endif
        if (curwin->w_curswant == MAXCOL)
          oparg.end_vcol = MAXCOL;
        /* Swap the start, end vcol if needed */
        if (oparg.end_vcol < oparg.start_vcol)
        {
          oparg.end_vcol += oparg.start_vcol;
          oparg.start_vcol = oparg.end_vcol - oparg.start_vcol;
          oparg.end_vcol -= oparg.start_vcol;
        }
      }
      line_count_selected = max_pos.lnum - min_pos.lnum + 1;
    }

    for (lnum = 1; lnum <= curbuf->b_ml.ml_line_count; ++lnum)
    {
      /* Check for a CTRL-C every 100000 characters. */
      if (byte_count > last_check)
      {
        ui_breakcheck();
        if (got_int)
          return;
        last_check = byte_count + 100000L;
      }

      /* Do extra processing for VIsual mode. */
      if (VIsual_active && lnum >= min_pos.lnum && lnum <= max_pos.lnum)
      {
        char_u *s = NULL;
        long len = 0L;

        switch (VIsual_mode)
        {
        case Ctrl_V:
          virtual_op = virtual_active();
          block_prep(&oparg, &bd, lnum, 0);
          virtual_op = MAYBE;
          s = bd.textstart;
          len = (long)bd.textlen;
          break;
        case 'V':
          s = ml_get(lnum);
          len = MAXCOL;
          break;
        case 'v':
        {
          colnr_T start_col = (lnum == min_pos.lnum) ? min_pos.col : 0;
          colnr_T end_col =
              (lnum == max_pos.lnum) ? max_pos.col - start_col + 1 : MAXCOL;

          s = ml_get(lnum) + start_col;
          len = end_col;
        }
        break;
        }
        if (s != NULL)
        {
          byte_count_cursor += line_count_info(
              s, &word_count_cursor, &char_count_cursor, len, eol_size);
          if (lnum == curbuf->b_ml.ml_line_count && !curbuf->b_p_eol &&
              (curbuf->b_p_bin || !curbuf->b_p_fixeol) && (long)STRLEN(s) < len)
            byte_count_cursor -= eol_size;
        }
      }
      else
      {
        /* In non-visual mode, check for the line the cursor is on */
        if (lnum == curwin->w_cursor.lnum)
        {
          word_count_cursor += word_count;
          char_count_cursor += char_count;
          byte_count_cursor =
              byte_count +
              line_count_info(
                  ml_get(lnum), &word_count_cursor, &char_count_cursor,
                  (varnumber_T)(curwin->w_cursor.col + 1), eol_size);
        }
      }
      /* Add to the running totals */
      byte_count += line_count_info(ml_get(lnum), &word_count, &char_count,
                                    (varnumber_T)MAXCOL, eol_size);
    }

    /* Correction for when last line doesn't have an EOL. */
    if (!curbuf->b_p_eol && (curbuf->b_p_bin || !curbuf->b_p_fixeol))
      byte_count -= eol_size;

    if (dict == NULL)
    {
      if (VIsual_active)
      {
        if (VIsual_mode == Ctrl_V && curwin->w_curswant < MAXCOL)
        {
          getvcols(curwin, &min_pos, &max_pos, &min_pos.col, &max_pos.col);
          vim_snprintf((char *)buf1, sizeof(buf1), _("%ld Cols; "),
                       (long)(oparg.end_vcol - oparg.start_vcol + 1));
        }
        else
          buf1[0] = NUL;

        if (char_count_cursor == byte_count_cursor && char_count == byte_count)
          vim_snprintf((char *)IObuff, IOSIZE,
                       _("Selected %s%ld of %ld Lines; %lld of %lld Words; "
                         "%lld of %lld Bytes"),
                       buf1, line_count_selected,
                       (long)curbuf->b_ml.ml_line_count,
                       (long_long_T)word_count_cursor, (long_long_T)word_count,
                       (long_long_T)byte_count_cursor, (long_long_T)byte_count);
        else
          vim_snprintf((char *)IObuff, IOSIZE,
                       _("Selected %s%ld of %ld Lines; %lld of %lld Words; "
                         "%lld of %lld Chars; %lld of %lld Bytes"),
                       buf1, line_count_selected,
                       (long)curbuf->b_ml.ml_line_count,
                       (long_long_T)word_count_cursor, (long_long_T)word_count,
                       (long_long_T)char_count_cursor, (long_long_T)char_count,
                       (long_long_T)byte_count_cursor, (long_long_T)byte_count);
      }
      else
      {
        p = ml_get_curline();
        validate_virtcol();
        col_print(buf1, sizeof(buf1), (int)curwin->w_cursor.col + 1,
                  (int)curwin->w_virtcol + 1);
        col_print(buf2, sizeof(buf2), (int)STRLEN(p), linetabsize(p));

        if (char_count_cursor == byte_count_cursor && char_count == byte_count)
          vim_snprintf((char *)IObuff, IOSIZE,
                       _("Col %s of %s; Line %ld of %ld; Word %lld of %lld; "
                         "Byte %lld of %lld"),
                       (char *)buf1, (char *)buf2, (long)curwin->w_cursor.lnum,
                       (long)curbuf->b_ml.ml_line_count,
                       (long_long_T)word_count_cursor, (long_long_T)word_count,
                       (long_long_T)byte_count_cursor, (long_long_T)byte_count);
        else
          vim_snprintf((char *)IObuff, IOSIZE,
                       _("Col %s of %s; Line %ld of %ld; Word %lld of %lld; "
                         "Char %lld of %lld; Byte %lld of %lld"),
                       (char *)buf1, (char *)buf2, (long)curwin->w_cursor.lnum,
                       (long)curbuf->b_ml.ml_line_count,
                       (long_long_T)word_count_cursor, (long_long_T)word_count,
                       (long_long_T)char_count_cursor, (long_long_T)char_count,
                       (long_long_T)byte_count_cursor, (long_long_T)byte_count);
      }
    }

    bom_count = bomb_size();
    if (bom_count > 0)
      vim_snprintf((char *)IObuff + STRLEN(IObuff), IOSIZE,
                   _("(+%lld for BOM)"), (long_long_T)bom_count);
    if (dict == NULL)
    {
      /* Don't shorten this message, the user asked for it. */
      p = p_shm;
      p_shm = (char_u *)"";
      msg((char *)IObuff);
      p_shm = p;
    }
  }
#if defined(FEAT_EVAL)
  if (dict != NULL)
  {
    dict_add_number(dict, "words", word_count);
    dict_add_number(dict, "chars", char_count);
    dict_add_number(dict, "bytes", byte_count + bom_count);
    dict_add_number(dict, VIsual_active ? "visual_bytes" : "cursor_bytes",
                    byte_count_cursor);
    dict_add_number(dict, VIsual_active ? "visual_chars" : "cursor_chars",
                    char_count_cursor);
    dict_add_number(dict, VIsual_active ? "visual_words" : "cursor_words",
                    word_count_cursor);
  }
#endif
}
