locale/uselocale.c

   1 /* uselocale -- fetch and set the current per-thread locale
   2    Copyright (C) 2002 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <locale.h>
  21 #include "localeinfo.h"
  22
  23 #ifdef SHARED
  24
  25 /* Switch the current thread's locale to DATASET.
  26    If DATASET is null, instead just return the current setting.
  27    The special value LC_GLOBAL_LOCALE is the initial setting
  28    for all threads, and means the thread uses the global
  29    setting controlled by `setlocale'.  */
  30 locale_t
  31 __uselocale (locale_t newloc)
  32 {
  33   if (newloc == NULL)
  34     {
  35       locale_t loc = __libc_tsd_get (LOCALE);
  36       return loc == &_nl_global_locale ? LC_GLOBAL_LOCALE : loc;
  37     }
  38   if (newloc == LC_GLOBAL_LOCALE)
  39     {
  40       __libc_tsd_set (LOCALE, &_nl_global_locale);
  41       return LC_GLOBAL_LOCALE;
  42     }
  43   __libc_tsd_set (LOCALE, newloc);
  44   return newloc;
  45 }
  46 weak_alias (__uselocale, uselocale)
  47
  48 #else
  49
  50 # warning uselocale not implemented for static linking yet
  51
  52 #endif