intl/bindtextdom.c

   1 /* bindtextdom.c -- implementation of the bindtextdomain(3) function
   2    Copyright (C) 1995, 1997 Free Software Foundation, Inc.
   3
   4    This file is part of the GNU C Library.  Its master source is NOT part of
   5    the C library, however.  The master source lives in /gd/gnu/lib.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Library General Public License as
   9    published by the Free Software Foundation; either version 2 of the
  10    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    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  19    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 # include <config.h>
  24 #endif
  25
  26 #if defined STDC_HEADERS || defined _LIBC
  27 # include <stdlib.h>
  28 #else
  29 # ifdef HAVE_MALLOC_H
  30 #  include <malloc.h>
  31 # else
  32 void free ();
  33 # endif
  34 #endif
  35
  36 #if defined HAVE_STRING_H || defined _LIBC
  37 # include <string.h>
  38 #else
  39 # include <strings.h>
  40 #endif
  41
  42 #ifdef _LIBC
  43 # include <libintl.h>
  44 #else
  45 # include "libgettext.h"
  46 #endif
  47 #include "gettext.h"
  48 #include "gettextP.h"
  49
  50 /* @@ end of prolog @@ */
  51
  52 /* Contains the default location of the message catalogs.  */
  53 extern const char _nl_default_dirname[];
  54
  55 /* List with bindings of specific domains.  */
  56 extern struct binding *_nl_domain_bindings;
  57
  58
  59 /* Names for the libintl functions are a problem.  They must not clash
  60    with existing names and they should follow ANSI C.  But this source
  61    code is also used in GNU C Library where the names have a __
  62    prefix.  So we have to make a difference here.  */
  63 #ifdef _LIBC
  64 # define BINDTEXTDOMAIN __bindtextdomain
  65 #else
  66 # define BINDTEXTDOMAIN bindtextdomain__
  67 #endif
  68
  69 /* Specify that the DOMAINNAME message catalog will be found
  70    in DIRNAME rather than in the system locale data base.  */
  71 char *
  72 BINDTEXTDOMAIN (domainname, dirname)
  73      const char *domainname;
  74      const char *dirname;
  75 {
  76   struct binding *binding;
  77
  78   /* Some sanity checks.  */
  79   if (domainname == NULL || domainname[0] == '\0')
  80     return NULL;
  81
  82   for (binding = _nl_domain_bindings; binding != NULL; binding = binding->next)
  83     {
  84       int compare = strcmp (domainname, binding->domainname);
  85       if (compare == 0)
  86         /* We found it!  */
  87         break;
  88       if (compare < 0)
  89         {
  90           /* It is not in the list.  */
  91           binding = NULL;
  92           break;
  93         }
  94     }
  95
  96   if (dirname == NULL)
  97     /* The current binding has be to returned.  */
  98     return binding == NULL ? (char *) _nl_default_dirname : binding->dirname;
  99
 100   if (binding != NULL)
 101     {
 102       /* The domain is already bound.  Replace the old binding.  */
 103       char *new_dirname;
 104
 105       if (strcmp (dirname, _nl_default_dirname) == 0)
 106         new_dirname = (char *) _nl_default_dirname;
 107       else
 108         {
 109           size_t len = strlen (dirname) + 1;
 110           new_dirname = (char *) malloc (len);
 111           if (new_dirname == NULL)
 112             return NULL;
 113
 114           memcpy (new_dirname, dirname, len);
 115         }
 116
 117       if (strcmp (binding->dirname, _nl_default_dirname) != 0)
 118         free (binding->dirname);
 119
 120       binding->dirname = new_dirname;
 121     }
 122   else
 123     {
 124       /* We have to create a new binding.  */
 125       size_t len;
 126       struct binding *new_binding =
 127         (struct binding *) malloc (sizeof (*new_binding));
 128
 129       if (new_binding == NULL)
 130         return NULL;
 131
 132       len = strlen (domainname) + 1;
 133       new_binding->domainname = (char *) malloc (len);
 134       if (new_binding->domainname == NULL)
 135           return NULL;
 136       memcpy (new_binding->domainname, domainname, len);
 137
 138       if (strcmp (dirname, _nl_default_dirname) == 0)
 139         new_binding->dirname = (char *) _nl_default_dirname;
 140       else
 141         {
 142           len = strlen (dirname) + 1;
 143           new_binding->dirname = (char *) malloc (len);
 144           if (new_binding->dirname == NULL)
 145             return NULL;
 146           memcpy (new_binding->dirname, dirname, len);
 147         }
 148
 149       /* Now enqueue it.  */
 150       if (_nl_domain_bindings == NULL
 151           || strcmp (domainname, _nl_domain_bindings->domainname) < 0)
 152         {
 153           new_binding->next = _nl_domain_bindings;
 154           _nl_domain_bindings = new_binding;
 155         }
 156       else
 157         {
 158           binding = _nl_domain_bindings;
 159           while (binding->next != NULL
 160                  && strcmp (domainname, binding->next->domainname) > 0)
 161             binding = binding->next;
 162
 163           new_binding->next = binding->next;
 164           binding->next = new_binding;
 165         }
 166
 167       binding = new_binding;
 168     }
 169
 170   return binding->dirname;
 171 }
 172
 173 #ifdef _LIBC
 174 /* Alias for function name in GNU C Library.  */
 175 weak_alias (__bindtextdomain, bindtextdomain);
 176 #endif