1: /* Copyright (C) 1996-2001, 2002, 2003, 2006 Free Software Foundation, Inc.
    2:    This file is part of the GNU C Library.
    3:    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
    4: 
    5:    The GNU C Library is free software; you can redistribute it and/or
    6:    modify it under the terms of the GNU Lesser General Public
    7:    License as published by the Free Software Foundation; either
    8:    version 2.1 of the License, or (at your option) any later version.
    9: 
   10:    The GNU C Library is distributed in the hope that it will be useful,
   11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:    Lesser General Public License for more details.
   14: 
   15:    You should have received a copy of the GNU Lesser General Public
   16:    License along with the GNU C Library; if not, write to the Free
   17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   18:    02111-1307 USA.  */
   19: 
   20: #include <assert.h>
   21: #include <locale.h>
   22: #include <stdlib.h>
   23: #include <string.h>
   24: #include <unistd.h>
   25: #ifdef _POSIX_MAPPED_FILES
   26: # include <sys/mman.h>
   27: #endif
   28: 
   29: #include "localeinfo.h"
   30: #include "../iconv/gconv_charset.h"
   31: #include "../iconv/gconv_int.h"
   32: 
   33: 
   34: #ifdef NL_CURRENT_INDIRECT
   35: # define DEFINE_CATEGORY(category, category_name, items, a) \
   36: extern struct locale_data _nl_C_##category; \
   37: weak_extern (_nl_C_##category)
   38: # include "categories.def"
   39: # undef DEFINE_CATEGORY
   40: 
   41: /* Array indexed by category of pointers to _nl_C_CATEGORY slots.
   42:    Elements are zero for categories whose data is never used.  */
   43: struct locale_data *const _nl_C[] attribute_hidden =
   44:   {
   45: # define DEFINE_CATEGORY(category, category_name, items, a) \
   46:     [category] = &_nl_C_##category,
   47: # include "categories.def"
   48: # undef DEFINE_CATEGORY
   49:   };
   50: #else
   51: # define _nl_C          (_nl_C_locobj.__locales)
   52: #endif
   53: 
   54: 
   55: /* For each category we keep a list of records for the locale files
   56:    which are somehow addressed.  */
   57: struct loaded_l10nfile *_nl_locale_file_list[__LC_LAST];
   58: 
   59: const char _nl_default_locale_path[] attribute_hidden = LOCALEDIR;
   60: 
   61: 
   62: struct locale_data *
   63: internal_function
   64: _nl_find_locale (const char *locale_path, size_t locale_path_len,
   65:                  int category, const char **name)
   66: {
   67:   int mask;
   68:   /* Name of the locale for this category.  */
   69:   char *loc_name;
   70:   const char *language;
   71:   const char *modifier;
   72:   const char *territory;
   73:   const char *codeset;
   74:   const char *normalized_codeset;
   75:   struct loaded_l10nfile *locale_file;
   76: 
   77:   if ((*name)[0] == '\0')
   78:     {
   79:       /* The user decides which locale to use by setting environment
   80:          variables.  */
   81:       *name = getenv ("LC_ALL");
   82:       if (*name == NULL || (*name)[0] == '\0')
   83:         *name = getenv (_nl_category_names.str
   84:                         + _nl_category_name_idxs[category]);
   85:       if (*name == NULL || (*name)[0] == '\0')
   86:         *name = getenv ("LANG");
   87:     }
   88: 
   89:   if (*name == NULL || (*name)[0] == '\0'
   90:       || (__builtin_expect (__libc_enable_secure, 0)
   91:           && strchr (*name, '/') != NULL))
   92:     *name = (char *) _nl_C_name;
   93: 
   94:   if (__builtin_expect (strcmp (*name, _nl_C_name), 1) == 0
   95:       || __builtin_expect (strcmp (*name, _nl_POSIX_name), 1) == 0)
   96:     {
   97:       /* We need not load anything.  The needed data is contained in
   98:          the library itself.  */
   99:       *name = (char *) _nl_C_name;
  100:       return _nl_C[category];
  101:     }
  102: 
  103:   /* We really have to load some data.  First we try the archive,
  104:      but only if there was no LOCPATH environment variable specified.  */
  105:   if (__builtin_expect (locale_path == NULL, 1))
  106:     {
  107:       struct locale_data *data = _nl_load_locale_from_archive (category, name);
  108:       if (__builtin_expect (data != NULL, 1))
  109:         return data;
  110: 
  111:       /* Nothing in the archive.  Set the default path to search below.  */
  112:       locale_path = _nl_default_locale_path;
  113:       locale_path_len = sizeof _nl_default_locale_path;
  114:     }
  115: 
  116:   /* We really have to load some data.  First see whether the name is
  117:      an alias.  Please note that this makes it impossible to have "C"
  118:      or "POSIX" as aliases.  */
  119:   loc_name = (char *) _nl_expand_alias (*name);
  120:   if (loc_name == NULL)
  121:     /* It is no alias.  */
  122:     loc_name = (char *) *name;
  123: 
  124:   /* Make a writable copy of the locale name.  */
  125:   loc_name = strdupa (loc_name);
  126: 
  127:   /* LOCALE can consist of up to four recognized parts for the XPG syntax:
  128: 
  129:                 language[_territory[.codeset]][@modifier]
  130: 
  131:      Beside the first all of them are allowed to be missing.  If the
  132:      full specified locale is not found, the less specific one are
  133:      looked for.  The various part will be stripped off according to
  134:      the following order:
  135:                 (1) codeset
  136:                 (2) normalized codeset
  137:                 (3) territory
  138:                 (4) modifier
  139:    */
  140:   mask = _nl_explode_name (loc_name, &language, &modifier, &territory,
  141:                            &codeset, &normalized_codeset);
  142: 
  143:   /* If exactly this locale was already asked for we have an entry with
  144:      the complete name.  */
  145:   locale_file = _nl_make_l10nflist (&_nl_locale_file_list[category],
  146:                                     locale_path, locale_path_len, mask,
  147:                                     language, territory, codeset,
  148:                                     normalized_codeset, modifier,
  149:                                     _nl_category_names.str
  150:                                     + _nl_category_name_idxs[category], 0);
  151: 
  152:   if (locale_file == NULL)
  153:     {
  154:       /* Find status record for addressed locale file.  We have to search
  155:          through all directories in the locale path.  */
  156:       locale_file = _nl_make_l10nflist (&_nl_locale_file_list[category],
  157:                                         locale_path, locale_path_len, mask,
  158:                                         language, territory, codeset,
  159:                                         normalized_codeset, modifier,
  160:                                         _nl_category_names.str
  161:                                         + _nl_category_name_idxs[category], 1);
  162:       if (locale_file == NULL)
  163:         /* This means we are out of core.  */
  164:         return NULL;
  165:     }
  166: 
  167:   /* The space for normalized_codeset is dynamically allocated.  Free it.  */
  168:   if (mask & XPG_NORM_CODESET)
  169:     free ((void *) normalized_codeset);
  170: 
  171:   if (locale_file->decided == 0)
  172:     _nl_load_locale (locale_file, category);
  173: 
  174:   if (locale_file->data == NULL)
  175:     {
  176:       int cnt;
  177:       for (cnt = 0; locale_file->successor[cnt] != NULL; ++cnt)
  178:         {
  179:           if (locale_file->successor[cnt]->decided == 0)
  180:             _nl_load_locale (locale_file->successor[cnt], category);
  181:           if (locale_file->successor[cnt]->data != NULL)
  182:             break;
  183:         }
  184:       /* Move the entry we found (or NULL) to the first place of
  185:          successors.  */
  186:       locale_file->successor[0] = locale_file->successor[cnt];
  187:       locale_file = locale_file->successor[cnt];
  188: 
  189:       if (locale_file == NULL)
  190:         return NULL;
  191:     }
  192: 
  193:   /* The LC_CTYPE category allows to check whether a locale is really
  194:      usable.  If the locale name contains a charset name and the
  195:      charset name used in the locale (present in the LC_CTYPE data) is
  196:      not the same (after resolving aliases etc) we reject the locale
  197:      since using it would irritate users expecting the charset named
  198:      in the locale name.  */
  199:   if (codeset != NULL)
  200:     {
  201:       /* Get the codeset information from the locale file.  */
  202:       static const int codeset_idx[] =
  203:         {
  204:           [__LC_CTYPE] = _NL_ITEM_INDEX (CODESET),
  205:           [__LC_NUMERIC] = _NL_ITEM_INDEX (_NL_NUMERIC_CODESET),
  206:           [__LC_TIME] = _NL_ITEM_INDEX (_NL_TIME_CODESET),
  207:           [__LC_COLLATE] = _NL_ITEM_INDEX (_NL_COLLATE_CODESET),
  208:           [__LC_MONETARY] = _NL_ITEM_INDEX (_NL_MONETARY_CODESET),
  209:           [__LC_MESSAGES] = _NL_ITEM_INDEX (_NL_MESSAGES_CODESET),
  210:           [__LC_PAPER] = _NL_ITEM_INDEX (_NL_PAPER_CODESET),
  211:           [__LC_NAME] = _NL_ITEM_INDEX (_NL_NAME_CODESET),
  212:           [__LC_ADDRESS] = _NL_ITEM_INDEX (_NL_ADDRESS_CODESET),
  213:           [__LC_TELEPHONE] = _NL_ITEM_INDEX (_NL_TELEPHONE_CODESET),
  214:           [__LC_MEASUREMENT] = _NL_ITEM_INDEX (_NL_MEASUREMENT_CODESET),
  215:           [__LC_IDENTIFICATION] = _NL_ITEM_INDEX (_NL_IDENTIFICATION_CODESET)
  216:         };
  217:       const struct locale_data *data;
  218:       const char *locale_codeset;
  219:       char *clocale_codeset;
  220:       char *ccodeset;
  221: 
  222:       data = (const struct locale_data *) locale_file->data;
  223:       locale_codeset =
  224:         (const char *) data->values[codeset_idx[category]].string;
  225:       assert (locale_codeset != NULL);
  226:       /* Note the length of the allocated memory: +3 for up to two slashes
  227:          and the NUL byte.  */
  228:       clocale_codeset = (char *) alloca (strlen (locale_codeset) + 3);
  229:       strip (clocale_codeset, locale_codeset);
  230: 
  231:       ccodeset = (char *) alloca (strlen (codeset) + 3);
  232:       strip (ccodeset, codeset);
  233: 
  234:       if (__gconv_compare_alias (upstr (ccodeset, ccodeset),
  235:                                  upstr (clocale_codeset,
  236:                                         clocale_codeset)) != 0)
  237:         /* The codesets are not identical, don't use the locale.  */
  238:         return NULL;
  239:     }
  240: 
  241:   /* Determine the locale name for which loading succeeded.  This
  242:      information comes from the file name.  The form is
  243:      <path>/<locale>/LC_foo.  We must extract the <locale> part.  */
  244:   if (((const struct locale_data *) locale_file->data)->name == NULL)
  245:     {
  246:       char *cp, *endp;
  247: 
  248:       endp = strrchr (locale_file->filename, '/');
  249:       cp = endp - 1;
  250:       while (cp[-1] != '/')
  251:         --cp;
  252:       ((struct locale_data *) locale_file->data)->name = __strndup (cp,
  253:                                                                     endp - cp);
  254:     }
  255: 
  256:   /* Determine whether the user wants transliteration or not.  */
  257:   if (modifier != NULL && __strcasecmp (modifier, "TRANSLIT") == 0)
  258:     ((struct locale_data *) locale_file->data)->use_translit = 1;
  259: 
  260:   /* Increment the usage count.  */
  261:   if (((const struct locale_data *) locale_file->data)->usage_count
  262:       < MAX_USAGE_COUNT)
  263:     ++((struct locale_data *) locale_file->data)->usage_count;
  264: 
  265:   return (struct locale_data *) locale_file->data;
  266: }
  267: 
  268: 
  269: /* Calling this function assumes the lock for handling global locale data
  270:    is acquired.  */
  271: void
  272: internal_function
  273: _nl_remove_locale (int locale, struct locale_data *data)
  274: {
  275:   if (--data->usage_count == 0)
  276:     {
  277:       if (data->alloc != ld_archive)
  278:         {
  279:           /* First search the entry in the list of loaded files.  */
  280:           struct loaded_l10nfile *ptr = _nl_locale_file_list[locale];
  281: 
  282:           /* Search for the entry.  It must be in the list.  Otherwise it
  283:              is a bug and we crash badly.  */
  284:           while ((struct locale_data *) ptr->data != data)
  285:             ptr = ptr->next;
  286: 
  287:           /* Mark the data as not available anymore.  So when the data has
  288:              to be used again it is reloaded.  */
  289:           ptr->decided = 0;
  290:           ptr->data = NULL;
  291:         }
  292: 
  293:       /* This does the real work.  */
  294:       _nl_unload_locale (data);
  295:     }
  296: }