intl/finddomain.c

   1 /* Handle list of needed message catalogs
   2    Copyright (C) 1995-1999, 2000, 2001, 2002, 2004, 2006
   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
 130   /* We need to protect modifying the _NL_LOADED_DOMAINS data.  */
 131   __libc_rwlock_wrlock (lock);
 132
 133   /* Create all possible locale entries which might be interested in
 134      generalization.  */
 135   retval = _nl_make_l10nflist (&_nl_loaded_domains, dirname,
 136                                strlen (dirname) + 1, mask, language, territory,
 137                                codeset, normalized_codeset, modifier,
 138                                domainname, 1);
 139   __libc_rwlock_unlock (lock);
 140
 141   if (retval == NULL)
 142     /* This means we are out of core.  */
 143     return NULL;
 144
 145   if (retval->decided <= 0)
 146     _nl_load_domain (retval, domainbinding);
 147   if (retval->data == NULL)
 148     {
 149       int cnt;
 150       for (cnt = 0; retval->successor[cnt] != NULL; ++cnt)
 151         {
 152           if (retval->successor[cnt]->decided <= 0)
 153             _nl_load_domain (retval->successor[cnt], domainbinding);
 154           if (retval->successor[cnt]->data != NULL)
 155             break;
 156         }
 157     }
 158
 159   /* The space for normalized_codeset is dynamically allocated.  Free it.  */
 160   if (mask & XPG_NORM_CODESET)
 161     free ((void *) normalized_codeset);
 162
 163   return retval;
 164 }
 165
 166
 167 #ifdef _LIBC
 168 /* This is called from iconv/gconv_db.c's free_mem, as locales must
 169    be freed before freeing gconv steps arrays.  */
 170 void __libc_freeres_fn_section
 171 _nl_finddomain_subfreeres ()
 172 {
 173   struct loaded_l10nfile *runp = _nl_loaded_domains;
 174
 175   while (runp != NULL)
 176     {
 177       struct loaded_l10nfile *here = runp;
 178       if (runp->data != NULL)
 179         _nl_unload_domain ((struct loaded_domain *) runp->data);
 180       runp = runp->next;
 181       free ((char *) here->filename);
 182       free (here);
 183     }
 184 }
 185 #endif