intl/finddomain.c

   1 /* finddomain.c -- handle list of needed message catalogs
   2 Copyright (C) 1995, 1996 Free Software Foundation, Inc.
   3 Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library 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 the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18 Boston, MA 02111-1307, USA.  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include <ctype.h>
  25 #include <errno.h>
  26 #include <stdio.h>
  27 #include <sys/types.h>
  28
  29 #if defined STDC_HEADERS || defined _LIBC
  30 # include <stdlib.h>
  31 #else
  32 # ifdef HAVE_MALLOC_H
  33 #  include <malloc.h>
  34 # else
  35 void free ();
  36 # endif
  37 #endif
  38
  39 #if defined HAVE_STRING_H || defined _LIBC
  40 # include <string.h>
  41 #else
  42 # include <strings.h>
  43 #endif
  44 #if !HAVE_STRCHR && !defined _LIBC
  45 # ifndef strchr
  46 #  define strchr index
  47 # endif
  48 #endif
  49
  50 #if defined HAVE_UNISTD_H || defined _LIBC
  51 # include <unistd.h>
  52 #endif
  53
  54 #include "gettext.h"
  55 #include "gettextP.h"
  56 #ifdef _LIBC
  57 # include <libintl.h>
  58 #else
  59 # include "libgettext.h"
  60 #endif
  61
  62 /* @@ end of prolog @@ */
  63
  64 #ifdef _LIBC
  65 /* Rename the non ANSI C functions.  This is required by the standard
  66    because some ANSI C functions will require linking with this object
  67    file and the name space must not be polluted.  */
  68 # define stpcpy(dest, src) __stpcpy(dest, src)
  69 #endif
  70
  71 /* List of already loaded domains.  */
  72 static struct loaded_l10nfile *_nl_loaded_domains;
  73
  74 /* Substitution for systems lacking this function in their C library.  */
  75 #if !_LIBC && !HAVE_STPCPY
  76 static char *stpcpy__ PARAMS ((char *dest, const char *src));
  77 # define stpcpy(dest, src) stpcpy__ (dest, src)
  78 #endif
  79
  80
  81 /* Return a data structure describing the message catalog described by
  82    the DOMAINNAME and CATEGORY parameters with respect to the currently
  83    established bindings.  */
  84 struct loaded_l10nfile *
  85 _nl_find_domain (dirname, locale, domainname)
  86      const char *dirname;
  87      char *locale;
  88      const char *domainname;
  89 {
  90   struct loaded_l10nfile *retval;
  91   const char *language;
  92   const char *modifier;
  93   const char *territory;
  94   const char *codeset;
  95   const char *normalized_codeset;
  96   const char *special;
  97   const char *sponsor;
  98   const char *revision;
  99   const char *alias_value;
 100   int mask;
 101
 102   /* LOCALE can consist of up to four recognized parts for the XPG syntax:
 103
 104                 language[_territory[.codeset]][@modifier]
 105
 106      and six parts for the CEN syntax:
 107
 108         language[_territory][+audience][+special][,sponsor][_revision]
 109
 110      Beside the first all of them are allowed to be missing.  If the
 111      full specified locale is not found, the less specific one are
 112      looked for.  The various part will be stripped of according to
 113      the following order:
 114                 (1) revision
 115                 (2) sponsor
 116                 (3) special
 117                 (4) codeset
 118                 (5) normalized codeset
 119                 (6) territory
 120                 (7) audience/modifier
 121    */
 122
 123   /* If we have already tested for this locale entry there has to
 124      be one data set in the list of loaded domains.  */
 125   retval = _nl_make_l10nflist (&_nl_loaded_domains, dirname,
 126                                strlen (dirname) + 1, 0, locale, NULL, NULL,
 127                                NULL, NULL, NULL, NULL, NULL, domainname, 0);
 128   if (retval != NULL)
 129     {
 130       /* We know something about this locale.  */
 131       int cnt;
 132
 133       if (retval->decided == 0)
 134         _nl_load_domain (retval);
 135
 136       if (retval->data != NULL)
 137         return retval;
 138
 139       for (cnt = 0; retval->successor[cnt] != NULL; ++cnt)
 140         {
 141           if (retval->successor[cnt]->decided == 0)
 142             _nl_load_domain (retval->successor[cnt]);
 143
 144           if (retval->successor[cnt]->data != NULL)
 145             break;
 146         }
 147       return cnt >= 0 ? retval : NULL;
 148       /* NOTREACHED */
 149     }
 150
 151   /* See whether the locale value is an alias.  If yes its value
 152      *overwrites* the alias name.  No test for the original value is
 153      done.  */
 154   alias_value = _nl_expand_alias (locale);
 155   if (alias_value != NULL)
 156     {
 157       size_t len = strlen (alias_value) + 1;
 158       locale = (char *) malloc (len);
 159       if (locale == NULL)
 160         return NULL;
 161
 162       memcpy (locale, alias_value, len);
 163     }
 164
 165   /* Now we determine the single parts of the locale name.  First
 166      look for the language.  Termination symbols are `_' and `@' if
 167      we use XPG4 style, and `_', `+', and `,' if we use CEN syntax.  */
 168   mask = _nl_explode_name (locale, &language, &modifier, &territory,
 169                            &codeset, &normalized_codeset, &special,
 170                            &sponsor, &revision);
 171
 172   /* Create all possible locale entries which might be interested in
 173      generalzation.  */
 174   retval = _nl_make_l10nflist (&_nl_loaded_domains, dirname,
 175                                strlen (dirname) + 1, mask, language, territory,
 176                                codeset, normalized_codeset, modifier, special,
 177                                sponsor, revision, domainname, 1);
 178   if (retval == NULL)
 179     /* This means we are out of core.  */
 180     return NULL;
 181
 182   if (retval->decided == 0)
 183     _nl_load_domain (retval);
 184   if (retval->data == NULL)
 185     {
 186       int cnt;
 187       for (cnt = 0; retval->successor[cnt] != NULL; ++cnt)
 188         {
 189           if (retval->successor[cnt]->decided == 0)
 190             _nl_load_domain (retval->successor[cnt]);
 191           if (retval->successor[cnt]->data != NULL)
 192             break;
 193         }
 194     }
 195
 196   /* The room for an alias was dynamically allocated.  Free it now.  */
 197   if (alias_value != NULL)
 198     free (locale);
 199
 200   return retval;
 201 }
 202
 203 /* @@ begin of epilog @@ */
 204
 205 /* We don't want libintl.a to depend on any other library.  So we
 206    avoid the non-standard function stpcpy.  In GNU C Library this
 207    function is available, though.  Also allow the symbol HAVE_STPCPY
 208    to be defined.  */
 209 #if !_LIBC && !HAVE_STPCPY
 210 static char *
 211 stpcpy__ (dest, src)
 212      char *dest;
 213      const char *src;
 214 {
 215   while ((*dest++ = *src++) != '\0')
 216     /* Do nothing. */ ;
 217   return dest - 1;
 218 }
 219 #endif