glibc/intl/textdomain.c

/* textdomain.c -- implementation of the textdomain(3) function
   Copyright (C) 1995 Software Foundation, Inc.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#if defined STDC_HEADERS || defined _LIBC
# include <stdlib.h>
#endif

#if defined STDC_HEADERS || defined HAVE_STRING_H || defined _LIBC
# include <string.h>
#else
# include <strings.h>
#endif

#ifdef _LIBC
# include <libintl.h>
#else
# include "libgettext.h"
#endif

/* @@ end of prolog @@ */

/* Name of the default text domain.  */
extern const char _nl_default_default_domain[];

/* Default text domain in which entries for gettext(3) are to be found.  */
extern const char *_nl_current_default_domain;


/* Names for the libintl functions are a problem.  They must not clash
   with existing names and they should follow ANSI C.  But this source
   code is also used in GNU C Library where the names have a __
   prefix.  So we have to make a difference here.  */
#ifdef _LIBC
# define TEXTDOMAIN __textdomain
#else
# define TEXTDOMAIN textdomain__
#endif

/* Set the current default message catalog to DOMAINNAME.
   If DOMAINNAME is null, return the current default.
   If DOMAINNAME is "", reset to the default of "messages".  */
char *
TEXTDOMAIN (domainname)
     const char *domainname;
{
  char *old;

  /* A NULL pointer requests the current setting.  */
  if (domainname == NULL)
    return (char *) _nl_current_default_domain;

  old = (char *) _nl_current_default_domain;

  /* If domain name is the null string set to default domain "messages".  */
  if (domainname[0] == '\0'
      || strcmp (domainname, _nl_default_default_domain) == 0)
    _nl_current_default_domain = _nl_default_default_domain;
  else
    {
      /* If the following malloc fails `_nl_current_default_domain'
	 will be NULL.  This value will be returned and so signals we
	 are out of core.  */
      size_t len = strlen (domainname) + 1;
      char *cp = (char *) malloc (len);
      if (cp != NULL)
	memcpy (cp, domainname, len);
      _nl_current_default_domain = cp;
    }

  if (old != _nl_default_default_domain)
    free (old);

  return (char *) _nl_current_default_domain;
}

#ifdef _LIBC
/* Alias for function name in GNU C Library.  */
weak_alias (__textdomain, textdomain);
#endif