/* $NetBSD: setlocale.c,v 1.65 2018/01/04 20:57:29 kamil Exp $ */

/*-
 * Copyright (c)2008 Citrus Project,
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/localedef.h>
#include <locale.h>
#include <limits.h>
#include <paths.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "setlocale_local.h"

const char *_PathLocale = NULL;

static _locale_set_t all_categories[_LC_LAST] = {
  [LC_ALL] = &_generic_LC_ALL_setlocale,
  [LC_COLLATE] = &_dummy_LC_COLLATE_setlocale,
  [LC_CTYPE] = &_citrus_LC_CTYPE_setlocale,
  [LC_MONETARY] = &_citrus_LC_MONETARY_setlocale,
  [LC_NUMERIC] = &_citrus_LC_NUMERIC_setlocale,
  [LC_TIME] = &_citrus_LC_TIME_setlocale,
  [LC_MESSAGES] = &_citrus_LC_MESSAGES_setlocale,
};

/* XXX Consider locking the list. Race condition leaks memory. */
static SLIST_HEAD(, _locale_cache_t) caches = {__UNCONST(&_C_cache)};

int _setlocale_cache(locale_t loc, struct _locale_cache_t *cache) {
  const char *monetary_name = loc->part_name[LC_MONETARY];
  const char *numeric_name = loc->part_name[LC_NUMERIC];
  _NumericLocale *numeric = loc->part_impl[LC_NUMERIC];
  _MonetaryLocale *monetary = loc->part_impl[LC_MONETARY];
  struct lconv *ldata;

  struct _locale_cache_t *old_cache;

  SLIST_FOREACH(old_cache, &caches, cache_link) {
    if (monetary_name != old_cache->monetary_name &&
        strcmp(monetary_name, old_cache->monetary_name) != 0)
      continue;
    if (numeric_name != old_cache->numeric_name &&
        strcmp(numeric_name, old_cache->numeric_name) != 0)
      continue;
    loc->cache = old_cache;
    free(cache);
    return 0;
  }

  if (cache == NULL) {
    cache = malloc(sizeof(*cache));
    if (cache == NULL)
      return -1;
  }

  cache->monetary_name = monetary_name;
  cache->numeric_name = numeric_name;
  ldata = &cache->ldata;

  ldata->decimal_point = __UNCONST(numeric->decimal_point);
  ldata->thousands_sep = __UNCONST(numeric->thousands_sep);
  ldata->grouping = __UNCONST(numeric->grouping);

  ldata->int_curr_symbol = __UNCONST(monetary->int_curr_symbol);
  ldata->currency_symbol = __UNCONST(monetary->currency_symbol);
  ldata->mon_decimal_point = __UNCONST(monetary->mon_decimal_point);
  ldata->mon_thousands_sep = __UNCONST(monetary->mon_thousands_sep);
  ldata->mon_grouping = __UNCONST(monetary->mon_grouping);
  ldata->positive_sign = __UNCONST(monetary->positive_sign);
  ldata->negative_sign = __UNCONST(monetary->negative_sign);

  ldata->int_frac_digits = monetary->int_frac_digits;
  ldata->frac_digits = monetary->frac_digits;
  ldata->p_cs_precedes = monetary->p_cs_precedes;
  ldata->p_sep_by_space = monetary->p_sep_by_space;
  ldata->n_cs_precedes = monetary->n_cs_precedes;
  ldata->n_sep_by_space = monetary->n_sep_by_space;
  ldata->p_sign_posn = monetary->p_sign_posn;
  ldata->n_sign_posn = monetary->n_sign_posn;
  ldata->int_p_cs_precedes = monetary->int_p_cs_precedes;
  ldata->int_n_cs_precedes = monetary->int_n_cs_precedes;
  ldata->int_p_sep_by_space = monetary->int_p_sep_by_space;
  ldata->int_n_sep_by_space = monetary->int_n_sep_by_space;
  ldata->int_p_sign_posn = monetary->int_p_sign_posn;
  ldata->int_n_sign_posn = monetary->int_n_sign_posn;
  SLIST_INSERT_HEAD(&caches, cache, cache_link);

  loc->cache = cache;
  return 0;
}

_locale_set_t _find_category(int category) {
  static int initialised;

  if (!initialised) {
    if (issetugid() || ((_PathLocale == NULL &&
                         (_PathLocale = getenv("PATH_LOCALE")) == NULL) ||
                        *_PathLocale == '\0'))
      _PathLocale = _PATH_LOCALE;
    initialised = 1;
  }

  if (category >= LC_ALL && category < _LC_LAST)
    return all_categories[category];
  return NULL;
}

const char *_get_locale_env(const char *category) {
  const char *name;

  /* 1. check LC_ALL */
  name = (const char *)getenv("LC_ALL");
  if (name == NULL || *name == '\0') {
    /* 2. check LC_* */
    name = (const char *)getenv(category);
    if (name == NULL || *name == '\0') {
      /* 3. check LANG */
      name = getenv("LANG");
    }
  }
  if (name == NULL || *name == '\0' || strchr(name, '/'))
    /* 4. if none is set, fall to "C" */
    name = _C_LOCALE;
  return name;
}

char *__setlocale(int category, const char *name) {
  _locale_set_t sl;
  locale_t loc;
  struct _locale_cache_t *cache;
  const char *result;

  sl = _find_category(category);
  if (sl == NULL)
    return NULL;
  cache = malloc(sizeof(*cache));
  if (cache == NULL)
    return NULL;
  loc = _current_locale();
  result = (*sl)(name, loc);
  _setlocale_cache(loc, cache);
  return __UNCONST(result);
}

char *setlocale(int category, const char *locale) {

  /* locale may be NULL */

  __mb_len_max_runtime = MB_LEN_MAX;
  return __setlocale(category, locale);
}
