intl/textdomain.c

   1 /* Implementation of the textdomain(3) function.
   2    Copyright (C) 1995, 1996, 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 #endif
  29
  30 #if defined STDC_HEADERS || defined HAVE_STRING_H || defined _LIBC
  31 # include <string.h>
  32 #else
  33 # include <strings.h>
  34 # ifndef memcpy
  35 #  define memcpy(Dst, Src, Num) bcopy (Src, Dst, Num)
  36 # endif
  37 #endif
  38
  39 #ifdef _LIBC
  40 # include <libintl.h>
  41 #else
  42 # include "libgettext.h"
  43 #endif
  44
  45 /* @@ end of prolog @@ */
  46
  47 /* Name of the default text domain.  */
  48 extern const char _nl_default_default_domain[];
  49
  50 /* Default text domain in which entries for gettext(3) are to be found.  */
  51 extern const char *_nl_current_default_domain;
  52
  53
  54 /* Names for the libintl functions are a problem.  They must not clash
  55    with existing names and they should follow ANSI C.  But this source
  56    code is also used in GNU C Library where the names have a __
  57    prefix.  So we have to make a difference here.  */
  58 #ifdef _LIBC
  59 # define TEXTDOMAIN __textdomain
  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       size_t len = strlen (domainname) + 1;
  89       char *cp = (char *) malloc (len);
  90       if (cp != NULL)
  91         memcpy (cp, domainname, len);
  92       _nl_current_default_domain = cp;
  93     }
  94
  95   if (old != _nl_default_default_domain)
  96     free (old);
  97
  98   return (char *) _nl_current_default_domain;
  99 }
 100
 101 #ifdef _LIBC
 102 /* Alias for function name in GNU C Library.  */
 103 weak_alias (__textdomain, textdomain);
 104 #endif