intl/finddomain.c

   1 /* Handle list of needed message catalogs
   2    Copyright (C) 1995-1999, 2000, 2001, 2002, 2004
   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 cnt >= 0 ? retval : NULL;
 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     {
 123 #if defined _LIBC || defined HAVE_STRDUP
 124       locale = strdup (alias_value);
 125       if (locale == NULL)
 126         return NULL;
 127 #else
 128       size_t len = strlen (alias_value) + 1;
 129       locale = (char *) malloc (len);
 130       if (locale == NULL)
 131         return NULL;
 132
 133       memcpy (locale, alias_value, len);
 134 #endif
 135     }
 136
 137   /* Now we determine the single parts of the locale name.  First
 138      look for the language.  Termination symbols are `_' and `@' if
 139      we use XPG4 style, and `_', `+', and `,' if we use CEN syntax.  */
 140   mask = _nl_explode_name (locale, &language, &modifier, &territory,
 141                            &codeset, &normalized_codeset);
 142
 143   /* We need to protect modifying the _NL_LOADED_DOMAINS data.  */
 144   __libc_rwlock_wrlock (lock);
 145
 146   /* Create all possible locale entries which might be interested in
 147      generalization.  */
 148   retval = _nl_make_l10nflist (&_nl_loaded_domains, dirname,
 149                                strlen (dirname) + 1, mask, language, territory,
 150                                codeset, normalized_codeset, modifier,
 151                                domainname, 1);
 152   __libc_rwlock_unlock (lock);
 153
 154   if (retval == NULL)
 155     /* This means we are out of core.  */
 156     return NULL;
 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   /* The space for normalized_codeset is dynamically allocated.  Free it.  */
 177   if (mask & XPG_NORM_CODESET)
 178     free ((void *) normalized_codeset);
 179
 180   return retval;
 181 }
 182
 183
 184 #ifdef _LIBC
 185 /* This is called from iconv/gconv_db.c's free_mem, as locales must
 186    be freed before freeing gconv steps arrays.  */
 187 void __libc_freeres_fn_section
 188 _nl_finddomain_subfreeres ()
 189 {
 190   struct loaded_l10nfile *runp = _nl_loaded_domains;
 191
 192   while (runp != NULL)
 193     {
 194       struct loaded_l10nfile *here = runp;
 195       if (runp->data != NULL)
 196         _nl_unload_domain ((struct loaded_domain *) runp->data);
 197       runp = runp->next;
 198       free ((char *) here->filename);
 199       free (here);
 200     }
 201 }
 202 #endif