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/* Implementation of the textdomain(3) function.

   Copyright (C) 1995-1998, 2000, 2001 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; 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>

# ifndef memcpy

#  define memcpy(Dst, Src, Num) (bcopy (Src, Dst, Num), (Dst))

# endif

#endif

#ifdef _LIBC

# include <libintl.h>

#else

# include "libgnuintl.h"

#endif

#include "gettextP.h"

#ifdef _LIBC

/* We have to handle multi-threaded applications.  */

# include <bits/libc-lock.h>

#else

/* Provide dummy implementation if this is outside glibc.  */

# define __libc_rwlock_define(CLASS, NAME)

# define __libc_rwlock_wrlock(NAME)

# define __libc_rwlock_unlock(NAME)

#endif

/* The internal variables in the standalone libintl.a must have different

   names than the internal variables in GNU libc, otherwise programs

   using libintl.a cannot be linked statically.  */

#if !defined _LIBC

# define _nl_default_default_domain _nl_default_default_domain__

# define _nl_current_default_domain _nl_current_default_domain__

#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

# ifdef _GLIBC

#  ifndef strdup

#   define strdup(str) __strdup (str)

#  endif

# endif

#else

# define TEXTDOMAIN textdomain__

#endif

/* Lock variable to protect the global data in the gettext implementation.  */

__libc_rwlock_define (extern, _nl_state_lock)

/* 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 *new_domain;

  char *old_domain;

  /* A NULL pointer requests the current setting.  */

  if (domainname == NULL)

    return (char *) _nl_current_default_domain;

  __libc_rwlock_wrlock (_nl_state_lock);

  old_domain = (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;

      new_domain = (char *) _nl_current_default_domain;

    }

  else if (strcmp (domainname, old_domain) == 0)

    /* This can happen and people will use it to signal that some

       environment variable changed.  */

    new_domain = old_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.  */

#if defined _LIBC || defined HAVE_STRDUP

      new_domain = strdup (domainname);

#else

      size_t len = strlen (domainname) + 1;

      new_domain = (char *) malloc (len);

      if (new_domain != NULL)

        memcpy (new_domain, domainname, len);

#endif

      if (new_domain != NULL)

        _nl_current_default_domain = new_domain;

    }

  /* We use this possibility to signal a change of the loaded catalogs

     since this is most likely the case and there is no other easy we

     to do it.  Do it only when the call was successful.  */

  if (new_domain != NULL)

    {

      ++_nl_msg_cat_cntr;

      if (old_domain != new_domain && old_domain != _nl_default_default_domain)

        free (old_domain);

    }

  __libc_rwlock_unlock (_nl_state_lock);

  return new_domain;

}

#ifdef _LIBC

/* Alias for function name in GNU C Library.  */

weak_alias (__textdomain, textdomain);

#endif