intl/finddomain.c

   1 /* Handle list of needed message catalogs
   2    Copyright (C) 1995-1999, 2000-2001, 2003-2006 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 it
   6    under the terms of the GNU Library General Public License as published
   7    by the Free Software Foundation; either version 2, or (at your option)
   8    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 GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with this program; if not, write to the Free Software
  17    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  18    USA.  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include <stdio.h>
  25 #include <sys/types.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #if defined HAVE_UNISTD_H || defined _LIBC
  30 # include <unistd.h>
  31 #endif
  32
  33 #include "gettextP.h"
  34 #ifdef _LIBC
  35 # include <libintl.h>
  36 #else
  37 # include "libgnuintl.h"
  38 #endif
  39
  40 /* Handle multi-threaded applications.  */
  41 #ifdef _LIBC
  42 # include <bits/libc-lock.h>
  43 # define gl_rwlock_define_initialized __libc_rwlock_define_initialized
  44 # define gl_rwlock_rdlock __libc_rwlock_rdlock
  45 # define gl_rwlock_wrlock __libc_rwlock_wrlock
  46 # define gl_rwlock_unlock __libc_rwlock_unlock
  47 #else
  48 # include "lock.h"
  49 #endif
  50
  51 /* @@ end of prolog @@ */
  52 /* List of already loaded domains.  */
  53 static struct loaded_l10nfile *_nl_loaded_domains;
  54
  55
  56 /* Return a data structure describing the message catalog described by
  57    the DOMAINNAME and CATEGORY parameters with respect to the currently
  58    established bindings.  */
  59 struct loaded_l10nfile *
  60 internal_function
  61 _nl_find_domain (const char *dirname, char *locale,
  62                  const char *domainname, struct binding *domainbinding)
  63 {
  64   struct loaded_l10nfile *retval;
  65   const char *language;
  66   const char *modifier;
  67   const char *territory;
  68   const char *codeset;
  69   const char *normalized_codeset;
  70   const char *alias_value;
  71   int mask;
  72
  73   /* LOCALE can consist of up to four recognized parts for the XPG syntax:
  74
  75                 language[_territory][.codeset][@modifier]
  76
  77      Beside the first part all of them are allowed to be missing.  If
  78      the full specified locale is not found, the less specific one are
  79      looked for.  The various parts will be stripped off according to
  80      the following order:
  81                 (1) codeset
  82                 (2) normalized codeset
  83                 (3) territory
  84                 (4) modifier
  85    */
  86
  87   /* We need to protect modifying the _NL_LOADED_DOMAINS data.  */
  88   gl_rwlock_define_initialized (static, lock);
  89   gl_rwlock_rdlock (lock);
  90
  91   /* If we have already tested for this locale entry there has to
  92      be one data set in the list of loaded domains.  */
  93   retval = _nl_make_l10nflist (&_nl_loaded_domains, dirname,
  94                                strlen (dirname) + 1, 0, locale, NULL, NULL,
  95                                NULL, NULL, domainname, 0);
  96
  97   gl_rwlock_unlock (lock);
  98
  99   if (retval != NULL)
 100     {
 101       /* We know something about this locale.  */
 102       int cnt;
 103
 104       if (retval->decided <= 0)
 105         _nl_load_domain (retval, domainbinding);
 106
 107       if (retval->data != NULL)
 108         return retval;
 109
 110       for (cnt = 0; retval->successor[cnt] != NULL; ++cnt)
 111         {
 112           if (retval->successor[cnt]->decided <= 0)
 113             _nl_load_domain (retval->successor[cnt], domainbinding);
 114
 115           if (retval->successor[cnt]->data != NULL)
 116             break;
 117         }
 118
 119       return retval;
 120       /* NOTREACHED */
 121     }
 122
 123   /* See whether the locale value is an alias.  If yes its value
 124      *overwrites* the alias name.  No test for the original value is
 125      done.  */
 126   alias_value = _nl_expand_alias (locale);
 127   if (alias_value != NULL)
 128     {
 129 #if defined _LIBC || defined HAVE_STRDUP
 130       locale = strdup (alias_value);
 131       if (locale == NULL)
 132         return NULL;
 133 #else
 134       size_t len = strlen (alias_value) + 1;
 135       locale = (char *) malloc (len);
 136       if (locale == NULL)
 137         return NULL;
 138
 139       memcpy (locale, alias_value, len);
 140 #endif
 141     }
 142
 143   /* Now we determine the single parts of the locale name.  First
 144      look for the language.  Termination symbols are `_', '.', and `@'.  */
 145   mask = _nl_explode_name (locale, &language, &modifier, &territory,
 146                            &codeset, &normalized_codeset);
 147
 148   /* We need to protect modifying the _NL_LOADED_DOMAINS data.  */
 149   gl_rwlock_wrlock (lock);
 150
 151   /* Create all possible locale entries which might be interested in
 152      generalization.  */
 153   retval = _nl_make_l10nflist (&_nl_loaded_domains, dirname,
 154                                strlen (dirname) + 1, mask, language, territory,
 155                                codeset, normalized_codeset, modifier,
 156                                domainname, 1);
 157
 158   gl_rwlock_unlock (lock);
 159
 160   if (retval == NULL)
 161     /* This means we are out of core.  */
 162     return NULL;
 163
 164   if (retval->decided <= 0)
 165     _nl_load_domain (retval, domainbinding);
 166   if (retval->data == NULL)
 167     {
 168       int cnt;
 169       for (cnt = 0; retval->successor[cnt] != NULL; ++cnt)
 170         {
 171           if (retval->successor[cnt]->decided <= 0)
 172             _nl_load_domain (retval->successor[cnt], domainbinding);
 173           if (retval->successor[cnt]->data != NULL)
 174             break;
 175         }
 176     }
 177
 178   /* The room for an alias was dynamically allocated.  Free it now.  */
 179   if (alias_value != NULL)
 180     free (locale);
 181
 182   /* The space for normalized_codeset is dynamically allocated.  Free it.  */
 183   if (mask & XPG_NORM_CODESET)
 184     free ((void *) normalized_codeset);
 185
 186   return retval;
 187 }
 188
 189
 190 #ifdef _LIBC
 191 /* This is called from iconv/gconv_db.c's free_mem, as locales must
 192    be freed before freeing gconv steps arrays.  */
 193 void __libc_freeres_fn_section
 194 _nl_finddomain_subfreeres ()
 195 {
 196   struct loaded_l10nfile *runp = _nl_loaded_domains;
 197
 198   while (runp != NULL)
 199     {
 200       struct loaded_l10nfile *here = runp;
 201       if (runp->data != NULL)
 202         _nl_unload_domain ((struct loaded_domain *) runp->data);
 203       runp = runp->next;
 204       free ((char *) here->filename);
 205       free (here);
 206     }
 207 }
 208 #endif