intl/finddomain.c

   1 /* Handle list of needed message catalogs
   2    Copyright (C) 1995-2018 Free Software Foundation, Inc.
   3    Written by Ulrich Drepper <drepper@gnu.org>, 1995.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as published by
   7    the Free Software Foundation; either version 2.1 of the License, or
   8    (at your option) any later version.
   9
  10    This program 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
  13    GNU Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #ifdef HAVE_CONFIG_H
  19 # include <config.h>
  20 #endif
  21
  22 #include <stdio.h>
  23 #include <sys/types.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #if defined HAVE_UNISTD_H || defined _LIBC
  28 # include <unistd.h>
  29 #endif
  30
  31 #include "gettextP.h"
  32 #ifdef _LIBC
  33 # include <libintl.h>
  34 #else
  35 # include "libgnuintl.h"
  36 #endif
  37
  38 /* Handle multi-threaded applications.  */
  39 #ifdef _LIBC
  40 # include <libc-lock.h>
  41 # define gl_rwlock_define_initialized __libc_rwlock_define_initialized
  42 # define gl_rwlock_rdlock __libc_rwlock_rdlock
  43 # define gl_rwlock_wrlock __libc_rwlock_wrlock
  44 # define gl_rwlock_unlock __libc_rwlock_unlock
  45 #else
  46 # include "lock.h"
  47 #endif
  48
  49 /* @@ end of prolog @@ */
  50 /* List of already loaded domains.  */
  51 static struct loaded_l10nfile *_nl_loaded_domains;
  52
  53
  54 /* Return a data structure describing the message catalog described by
  55    the DOMAINNAME and CATEGORY parameters with respect to the currently
  56    established bindings.  */
  57 struct loaded_l10nfile *
  58 _nl_find_domain (const char *dirname, char *locale,
  59                  const char *domainname, struct binding *domainbinding)
  60 {
  61   struct loaded_l10nfile *retval;
  62   const char *language;
  63   const char *modifier;
  64   const char *territory;
  65   const char *codeset;
  66   const char *normalized_codeset;
  67   const char *alias_value;
  68   int mask;
  69
  70   /* LOCALE can consist of up to four recognized parts for the XPG syntax:
  71
  72                 language[_territory][.codeset][@modifier]
  73
  74      Beside the first part all of them are allowed to be missing.  If
  75      the full specified locale is not found, the less specific one are
  76      looked for.  The various parts will be stripped off according to
  77      the following order:
  78                 (1) codeset
  79                 (2) normalized codeset
  80                 (3) territory
  81                 (4) modifier
  82    */
  83
  84   /* We need to protect modifying the _NL_LOADED_DOMAINS data.  */
  85   gl_rwlock_define_initialized (static, lock);
  86   gl_rwlock_rdlock (lock);
  87
  88   /* If we have already tested for this locale entry there has to
  89      be one data set in the list of loaded domains.  */
  90   retval = _nl_make_l10nflist (&_nl_loaded_domains, dirname,
  91                                strlen (dirname) + 1, 0, locale, NULL, NULL,
  92                                NULL, NULL, domainname, 0);
  93
  94   gl_rwlock_unlock (lock);
  95
  96   if (retval != NULL)
  97     {
  98       /* We know something about this locale.  */
  99       int cnt;
 100
 101       if (retval->decided <= 0)
 102         _nl_load_domain (retval, domainbinding);
 103
 104       if (retval->data != NULL)
 105         return retval;
 106
 107       for (cnt = 0; retval->successor[cnt] != NULL; ++cnt)
 108         {
 109           if (retval->successor[cnt]->decided <= 0)
 110             _nl_load_domain (retval->successor[cnt], domainbinding);
 111
 112           if (retval->successor[cnt]->data != NULL)
 113             break;
 114         }
 115
 116       return retval;
 117       /* NOTREACHED */
 118     }
 119
 120   /* See whether the locale value is an alias.  If yes its value
 121      *overwrites* the alias name.  No test for the original value is
 122      done.  */
 123   alias_value = _nl_expand_alias (locale);
 124   if (alias_value != NULL)
 125     {
 126       size_t len = strlen (alias_value) + 1;
 127       locale = (char *) malloc (len);
 128       if (locale == NULL)
 129         return NULL;
 130
 131       memcpy (locale, alias_value, len);
 132     }
 133
 134   /* Now we determine the single parts of the locale name.  First
 135      look for the language.  Termination symbols are `_', '.', and `@'.  */
 136   mask = _nl_explode_name (locale, &language, &modifier, &territory,
 137                            &codeset, &normalized_codeset);
 138   if (mask == -1)
 139     /* This means we are out of core.  */
 140     return NULL;
 141
 142   /* We need to protect modifying the _NL_LOADED_DOMAINS data.  */
 143   gl_rwlock_wrlock (lock);
 144
 145   /* Create all possible locale entries which might be interested in
 146      generalization.  */
 147   retval = _nl_make_l10nflist (&_nl_loaded_domains, dirname,
 148                                strlen (dirname) + 1, mask, language, territory,
 149                                codeset, normalized_codeset, modifier,
 150                                domainname, 1);
 151
 152   gl_rwlock_unlock (lock);
 153
 154   if (retval == NULL)
 155     /* This means we are out of core.  */
 156     goto out;
 157
 158   if (retval->decided <= 0)
 159     _nl_load_domain (retval, domainbinding);
 160   if (retval->data == NULL)
 161     {
 162       int cnt;
 163       for (cnt = 0; retval->successor[cnt] != NULL; ++cnt)
 164         {
 165           if (retval->successor[cnt]->decided <= 0)
 166             _nl_load_domain (retval->successor[cnt], domainbinding);
 167           if (retval->successor[cnt]->data != NULL)
 168             break;
 169         }
 170     }
 171
 172   /* The room for an alias was dynamically allocated.  Free it now.  */
 173   if (alias_value != NULL)
 174     free (locale);
 175
 176 out:
 177   /* The space for normalized_codeset is dynamically allocated.  Free it.  */
 178   if (mask & XPG_NORM_CODESET)
 179     free ((void *) normalized_codeset);
 180
 181   return retval;
 182 }
 183
 184
 185 #ifdef _LIBC
 186 /* This is called from iconv/gconv_db.c's free_mem, as locales must
 187    be freed before freeing gconv steps arrays.  */
 188 void __libc_freeres_fn_section
 189 _nl_finddomain_subfreeres (void)
 190 {
 191   struct loaded_l10nfile *runp = _nl_loaded_domains;
 192
 193   while (runp != NULL)
 194     {
 195       struct loaded_l10nfile *here = runp;
 196       if (runp->data != NULL)
 197         _nl_unload_domain ((struct loaded_domain *) runp->data);
 198       runp = runp->next;
 199       free ((char *) here->filename);
 200       free (here);
 201     }
 202 }
 203 #endif