intl/textdomain.c

   1 /* textdomain.c -- implementation of the textdomain(3) function
   2    Copyright (C) 1995 Software Foundation, Inc.
   3
   4 This program is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation; either version 2, or (at your option)
   7 any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #ifdef HAVE_CONFIG_H
  19 # include <config.h>
  20 #endif
  21
  22 #if defined STDC_HEADERS || defined _LIBC
  23 # include <stdlib.h>
  24 #endif
  25
  26 #if defined STDC_HEADERS || defined HAVE_STRING_H || defined _LIBC
  27 # include <string.h>
  28 #else
  29 # include <strings.h>
  30 #endif
  31
  32 #ifdef _LIBC
  33 # include <libintl.h>
  34 #else
  35 # include "libgettext.h"
  36 #endif
  37
  38 /* @@ end of prolog @@ */
  39
  40 /* Name of the default text domain.  */
  41 extern const char _nl_default_default_domain[];
  42
  43 /* Default text domain in which entries for gettext(3) are to be found.  */
  44 extern const char *_nl_current_default_domain;
  45
  46
  47 /* Names for the libintl functions are a problem.  They must not clash
  48    with existing names and they should follow ANSI C.  But this source
  49    code is also used in GNU C Library where the names have a __
  50    prefix.  So we have to make a difference here.  */
  51 #ifdef _LIBC
  52 # define TEXTDOMAIN __textdomain
  53 #else
  54 # define TEXTDOMAIN textdomain__
  55 #endif
  56
  57 /* Set the current default message catalog to DOMAINNAME.
  58    If DOMAINNAME is null, return the current default.
  59    If DOMAINNAME is "", reset to the default of "messages".  */
  60 char *
  61 TEXTDOMAIN (domainname)
  62      const char *domainname;
  63 {
  64   char *old;
  65
  66   /* A NULL pointer requests the current setting.  */
  67   if (domainname == NULL)
  68     return (char *) _nl_current_default_domain;
  69
  70   old = (char *) _nl_current_default_domain;
  71
  72   /* If domain name is the null string set to default domain "messages".  */
  73   if (domainname[0] == '\0'
  74       || strcmp (domainname, _nl_default_default_domain) == 0)
  75     _nl_current_default_domain = _nl_default_default_domain;
  76   else
  77     {
  78       /* If the following malloc fails `_nl_current_default_domain'
  79          will be NULL.  This value will be returned and so signals we
  80          are out of core.  */
  81       size_t len = strlen (domainname) + 1;
  82       char *cp = (char *) malloc (len);
  83       if (cp != NULL)
  84         memcpy (cp, domainname, len);
  85       _nl_current_default_domain = cp;
  86     }
  87
  88   if (old != _nl_default_default_domain)
  89     free (old);
  90
  91   return (char *) _nl_current_default_domain;
  92 }
  93
  94 #ifdef _LIBC
  95 /* Alias for function name in GNU C Library.  */
  96 weak_alias (__textdomain, textdomain);
  97 #endif