intl/textdomain.c

   1 /* Implementation of the textdomain(3) function.
   2    Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
   3    Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 # include <config.h>
  21 #endif
  22
  23 #if defined STDC_HEADERS || defined _LIBC
  24 # include <stdlib.h>
  25 #endif
  26
  27 #if defined STDC_HEADERS || defined HAVE_STRING_H || defined _LIBC
  28 # include <string.h>
  29 #else
  30 # include <strings.h>
  31 # ifndef memcpy
  32 #  define memcpy(Dst, Src, Num) bcopy (Src, Dst, Num)
  33 # endif
  34 #endif
  35
  36 #ifdef _LIBC
  37 # include <libintl.h>
  38 #else
  39 # include "libgettext.h"
  40 #endif
  41
  42 /* @@ end of prolog @@ */
  43
  44 /* Name of the default text domain.  */
  45 extern const char _nl_default_default_domain[];
  46
  47 /* Default text domain in which entries for gettext(3) are to be found.  */
  48 extern const char *_nl_current_default_domain;
  49
  50
  51 /* Names for the libintl functions are a problem.  They must not clash
  52    with existing names and they should follow ANSI C.  But this source
  53    code is also used in GNU C Library where the names have a __
  54    prefix.  So we have to make a difference here.  */
  55 #ifdef _LIBC
  56 # define TEXTDOMAIN __textdomain
  57 # ifndef strdup
  58 #  define strdup(str) __strdup (str)
  59 # endif
  60 #else
  61 # define TEXTDOMAIN textdomain__
  62 #endif
  63
  64 /* Set the current default message catalog to DOMAINNAME.
  65    If DOMAINNAME is null, return the current default.
  66    If DOMAINNAME is "", reset to the default of "messages".  */
  67 char *
  68 TEXTDOMAIN (domainname)
  69      const char *domainname;
  70 {
  71   char *old;
  72
  73   /* A NULL pointer requests the current setting.  */
  74   if (domainname == NULL)
  75     return (char *) _nl_current_default_domain;
  76
  77   old = (char *) _nl_current_default_domain;
  78
  79   /* If domain name is the null string set to default domain "messages".  */
  80   if (domainname[0] == '\0'
  81       || strcmp (domainname, _nl_default_default_domain) == 0)
  82     _nl_current_default_domain = _nl_default_default_domain;
  83   else
  84     {
  85       /* If the following malloc fails `_nl_current_default_domain'
  86          will be NULL.  This value will be returned and so signals we
  87          are out of core.  */
  88 #if defined _LIBC || defined HAVE_STRDUP
  89       _nl_current_default_domain = strdup (domainname);
  90 #else
  91       size_t len = strlen (domainname) + 1;
  92       char *cp = (char *) malloc (len);
  93       if (cp != NULL)
  94         memcpy (cp, domainname, len);
  95       _nl_current_default_domain = cp;
  96 #endif
  97     }
  98
  99   if (old != _nl_default_default_domain)
 100     free (old);
 101
 102   return (char *) _nl_current_default_domain;
 103 }
 104
 105 #ifdef _LIBC
 106 /* Alias for function name in GNU C Library.  */
 107 weak_alias (__textdomain, textdomain);
 108 #endif