/* Implementation of the textdomain(3) function.   Copyright (C) 1995-1998, 2000-2003, 2005-2006 Free Software Foundation, Inc.   This program is free software; you can redistribute it and/or modify it   under the terms of the GNU Library 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   Library General Public License for more details.   You should have received a copy of the GNU Library General Public   License along with this program; if not, write to the Free Software   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,   USA.  */#ifdef HAVE_CONFIG_H# include <config.h>#endif#include <stdlib.h>#include <string.h>#include "gettextP.h"#ifdef _LIBC# include <libintl.h>#else# include "libgnuintl.h"#endif/* Handle multi-threaded applications.  */#ifdef _LIBC# include <bits/libc-lock.h># define gl_rwlock_define __libc_rwlock_define# define gl_rwlock_wrlock __libc_rwlock_wrlock# define gl_rwlock_unlock __libc_rwlock_unlock#else# include "lock.h"#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 libintl_nl_default_default_domain# define _nl_current_default_domain libintl_nl_current_default_domain#endif/* @@ end of prolog @@ *//* Name of the default text domain.  */extern const char _nl_default_default_domain[] attribute_hidden;/* Default text domain in which entries for gettext(3) are to be found.  */extern const char *_nl_current_default_domain attribute_hidden;/* 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# ifndef strdup#  define strdup(str) __strdup (str)# endif#else# define TEXTDOMAIN libintl_textdomain#endif/* Lock variable to protect the global data in the gettext implementation.  */gl_rwlock_define (extern, _nl_state_lock attribute_hidden)/* 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 (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;  gl_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);    }  gl_rwlock_unlock (_nl_state_lock);  return new_domain;}#ifdef _LIBC/* Alias for function name in GNU C Library.  */weak_alias (__textdomain, textdomain);#endif