mingw/share/gettext/intl/textdomain.c

   1 /* Implementation of the textdomain(3) function.
   2    Copyright (C) 1995-1998, 2000-2003, 2005-2006 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify it
   5    under the terms of the GNU Library General Public License as published
   6    by 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 GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with this program; if not, write to the Free Software
  16    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  17    USA.  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 # include <config.h>
  21 #endif
  22
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 #include "gettextP.h"
  27 #ifdef _LIBC
  28 # include <libintl.h>
  29 #else
  30 # include "libgnuintl.h"
  31 #endif
  32
  33 /* Handle multi-threaded applications.  */
  34 #ifdef _LIBC
  35 # include <bits/libc-lock.h>
  36 # define gl_rwlock_define __libc_rwlock_define
  37 # define gl_rwlock_wrlock __libc_rwlock_wrlock
  38 # define gl_rwlock_unlock __libc_rwlock_unlock
  39 #else
  40 # include "lock.h"
  41 #endif
  42
  43 /* @@ end of prolog @@ */
  44
  45
  46 /* Names for the libintl functions are a problem.  They must not clash
  47    with existing names and they should follow ANSI C.  But this source
  48    code is also used in GNU C Library where the names have a __
  49    prefix.  So we have to make a difference here.  */
  50 #ifdef _LIBC
  51 # define TEXTDOMAIN __textdomain
  52 # ifndef strdup
  53 #  define strdup(str) __strdup (str)
  54 # endif
  55 #else
  56 # define TEXTDOMAIN libintl_textdomain
  57 #endif
  58
  59 /* Lock variable to protect the global data in the gettext implementation.  */
  60 gl_rwlock_define (extern, _nl_state_lock attribute_hidden)
  61
  62 /* Set the current default message catalog to DOMAINNAME.
  63    If DOMAINNAME is null, return the current default.
  64    If DOMAINNAME is "", reset to the default of "messages".  */
  65 char *
  66 TEXTDOMAIN (const char *domainname)
  67 {
  68   char *new_domain;
  69   char *old_domain;
  70
  71   /* A NULL pointer requests the current setting.  */
  72   if (domainname == NULL)
  73     return (char *) _nl_current_default_domain;
  74
  75   gl_rwlock_wrlock (_nl_state_lock);
  76
  77   old_domain = (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     {
  83       _nl_current_default_domain = _nl_default_default_domain;
  84       new_domain = (char *) _nl_current_default_domain;
  85     }
  86   else if (strcmp (domainname, old_domain) == 0)
  87     /* This can happen and people will use it to signal that some
  88        environment variable changed.  */
  89     new_domain = old_domain;
  90   else
  91     {
  92       /* If the following malloc fails `_nl_current_default_domain'
  93          will be NULL.  This value will be returned and so signals we
  94          are out of core.  */
  95 #if defined _LIBC || defined HAVE_STRDUP
  96       new_domain = strdup (domainname);
  97 #else
  98       size_t len = strlen (domainname) + 1;
  99       new_domain = (char *) malloc (len);
 100       if (new_domain != NULL)
 101         memcpy (new_domain, domainname, len);
 102 #endif
 103
 104       if (new_domain != NULL)
 105         _nl_current_default_domain = new_domain;
 106     }
 107
 108   /* We use this possibility to signal a change of the loaded catalogs
 109      since this is most likely the case and there is no other easy we
 110      to do it.  Do it only when the call was successful.  */
 111   if (new_domain != NULL)
 112     {
 113       ++_nl_msg_cat_cntr;
 114
 115       if (old_domain != new_domain && old_domain != _nl_default_default_domain)
 116         free (old_domain);
 117     }
 118
 119   gl_rwlock_unlock (_nl_state_lock);
 120
 121   return new_domain;
 122 }
 123
 124 #ifdef _LIBC
 125 /* Alias for function name in GNU C Library.  */
 126 weak_alias (__textdomain, textdomain);
 127 #endif