intl/finddomain.c

   1 /* Handle list of needed message catalogs
   2    Copyright (C) 1995-1999, 2000, 2001, 2002, 2004, 2006, 2007
   3    Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Written by Ulrich Drepper <drepper@gnu.org>, 1995.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, write to the Free
  19    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20    02111-1307 USA.  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 # include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <sys/types.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30
  31 #if defined HAVE_UNISTD_H || defined _LIBC
  32 # include <unistd.h>
  33 #endif
  34
  35 #include "gettextP.h"
  36 #ifdef _LIBC
  37 # include <libintl.h>
  38 # include <bits/libc-lock.h>
  39 #else
  40 # include "libgnuintl.h"
  41 #endif
  42
  43 /* @@ end of prolog @@ */
  44 /* List of already loaded domains.  */
  45 static struct loaded_l10nfile *_nl_loaded_domains;
  46
  47
  48 /* Return a data structure describing the message catalog described by
  49    the DOMAINNAME and CATEGORY parameters with respect to the currently
  50    established bindings.  */
  51 struct loaded_l10nfile *
  52 internal_function
  53 _nl_find_domain (dirname, locale, domainname, domainbinding)
  54      const char *dirname;
  55      char *locale;
  56      const char *domainname;
  57      struct binding *domainbinding;
  58 {
  59   struct loaded_l10nfile *retval;
  60   const char *language;
  61   const char *modifier;
  62   const char *territory;
  63   const char *codeset;
  64   const char *normalized_codeset;
  65   const char *alias_value;
  66   int mask;
  67
  68   /* LOCALE can consist of up to four recognized parts for the XPG syntax:
  69
  70                 language[_territory[.codeset]][@modifier]
  71
  72      Beside the first part all of them are allowed to be missing.  If
  73      the full specified locale is not found, the less specific one are
  74      looked for.  The various parts will be stripped off according to
  75      the following order:
  76                 (1) codeset
  77                 (2) normalized codeset
  78                 (3) territory
  79                 (4) modifier
  80    */
  81
  82   /* We need to protect modifying the _NL_LOADED_DOMAINS data.  */
  83   __libc_rwlock_define_initialized (static, lock);
  84   __libc_rwlock_rdlock (lock);
  85
  86   /* If we have already tested for this locale entry there has to
  87      be one data set in the list of loaded domains.  */
  88   retval = _nl_make_l10nflist (&_nl_loaded_domains, dirname,
  89                                strlen (dirname) + 1, 0, locale, NULL, NULL,
  90                                NULL, NULL, domainname, 0);
  91   __libc_rwlock_unlock (lock);
  92
  93   if (retval != NULL)
  94     {
  95       /* We know something about this locale.  */
  96       int cnt;
  97
  98       if (retval->decided <= 0)
  99         _nl_load_domain (retval, domainbinding);
 100
 101       if (retval->data != NULL)
 102         return retval;
 103
 104       for (cnt = 0; retval->successor[cnt] != NULL; ++cnt)
 105         {
 106           if (retval->successor[cnt]->decided <= 0)
 107             _nl_load_domain (retval->successor[cnt], domainbinding);
 108
 109           if (retval->successor[cnt]->data != NULL)
 110             break;
 111         }
 112
 113       return retval;
 114       /* NOTREACHED */
 115     }
 116
 117   /* See whether the locale value is an alias.  If yes its value
 118      *overwrites* the alias name.  No test for the original value is
 119      done.  */
 120   alias_value = _nl_expand_alias (locale);
 121   if (alias_value != NULL)
 122     locale = strdupa (alias_value);
 123
 124   /* Now we determine the single parts of the locale name.  First
 125      look for the language.  Termination symbols are `_' and `@' if
 126      we use XPG4 style, and `_', `+', and `,' if we use CEN syntax.  */
 127   mask = _nl_explode_name (locale, &language, &modifier, &territory,
 128                            &codeset, &normalized_codeset);
 129   if (mask == -1)
 130     /* This means we are out of core.  */
 131     return NULL;
 132
 133   /* We need to protect modifying the _NL_LOADED_DOMAINS data.  */
 134   __libc_rwlock_wrlock (lock);
 135
 136   /* Create all possible locale entries which might be interested in
 137      generalization.  */
 138   retval = _nl_make_l10nflist (&_nl_loaded_domains, dirname,
 139                                strlen (dirname) + 1, mask, language, territory,
 140                                codeset, normalized_codeset, modifier,
 141                                domainname, 1);
 142   __libc_rwlock_unlock (lock);
 143
 144   if (retval == NULL)
 145     /* This means we are out of core.  */
 146     goto out;
 147
 148   if (retval->decided <= 0)
 149     _nl_load_domain (retval, domainbinding);
 150   if (retval->data == NULL)
 151     {
 152       int cnt;
 153       for (cnt = 0; retval->successor[cnt] != NULL; ++cnt)
 154         {
 155           if (retval->successor[cnt]->decided <= 0)
 156             _nl_load_domain (retval->successor[cnt], domainbinding);
 157           if (retval->successor[cnt]->data != NULL)
 158             break;
 159         }
 160     }
 161
 162 out:
 163   /* The space for normalized_codeset is dynamically allocated.  Free it.  */
 164   if (mask & XPG_NORM_CODESET)
 165     free ((void *) normalized_codeset);
 166
 167   return retval;
 168 }
 169
 170
 171 #ifdef _LIBC
 172 /* This is called from iconv/gconv_db.c's free_mem, as locales must
 173    be freed before freeing gconv steps arrays.  */
 174 void __libc_freeres_fn_section
 175 _nl_finddomain_subfreeres ()
 176 {
 177   struct loaded_l10nfile *runp = _nl_loaded_domains;
 178
 179   while (runp != NULL)
 180     {
 181       struct loaded_l10nfile *here = runp;
 182       if (runp->data != NULL)
 183         _nl_unload_domain ((struct loaded_domain *) runp->data);
 184       runp = runp->next;
 185       free ((char *) here->filename);
 186       free (here);
 187     }
 188 }
 189 #endif