locale/duplocale.c

   1 /* Duplicate handle for selection of locales.
   2    Copyright (C) 1997, 2000, 2001 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 Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the 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    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    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_LAST; ++cnt)
  46         if (cnt != LC_ALL)
  47           {
  48             result->__locales[cnt] = dataset->__locales[cnt];
  49             if (result->__locales[cnt]->usage_count < MAX_USAGE_COUNT)
  50               ++result->__locales[cnt]->usage_count;
  51           }
  52     }
  53
  54   /* Update the special members.  */
  55   result->__ctype_b = dataset->__ctype_b;
  56   result->__ctype_tolower = dataset->__ctype_tolower;
  57   result->__ctype_toupper = dataset->__ctype_toupper;
  58
  59   /* It's done.  */
  60   __libc_lock_unlock (__libc_setlocale_lock);
  61
  62   return result;
  63 }