locale/duplocale.c

   1 /* Duplicate handle for selection of locales.
   2    Copyright (C) 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <locale.h>
  22 #include <bits/libc-lock.h>
  23 #include <stdlib.h>
  24
  25 #include <localeinfo.h>
  26
  27
  28 /* Lock for protecting global data.  */
  29 __libc_lock_define (extern , __libc_setlocale_lock)
  30
  31
  32 __locale_t
  33 __duplocale (__locale_t dataset)
  34 {
  35   __locale_t result;
  36
  37   /* We modify global data.  */
  38   __libc_lock_lock (__libc_setlocale_lock);
  39
  40   /* Get memory.  */
  41   result = (__locale_t) malloc (sizeof (struct __locale_struct));
  42   if (result != NULL)
  43     {
  44       int cnt;
  45       for (cnt = 0; cnt < LC_ALL; ++cnt)
  46         {
  47           result->__locales[cnt] = dataset->__locales[cnt];
  48           if (result->__locales[cnt]->usage_count < MAX_USAGE_COUNT)
  49             ++result->__locales[cnt]->usage_count;
  50         }
  51     }
  52
  53   /* It's done.  */
  54   __libc_lock_unlock (__libc_setlocale_lock);
  55
  56   return result;
  57 }