locale/duplocale.c

   1 /* Duplicate handle for selection of locales.
   2    Copyright (C) 1997, 2000, 2001, 2002 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 attribute_hidden)
  30
  31
  32 __locale_t
  33 __duplocale (__locale_t dataset)
  34 {
  35   __locale_t result;
  36   int cnt;
  37
  38   /* We modify global data.  */
  39   __libc_lock_lock (__libc_setlocale_lock);
  40
  41   /* Get memory.  */
  42   result = (__locale_t) malloc (sizeof (struct __locale_struct));
  43
  44   if (result != NULL)
  45     /* Duplicate the names in a separate loop first so we can
  46        bail out if strdup fails and not have touched usage_counts.  */
  47     for (cnt = 0; cnt < __LC_LAST; ++cnt)
  48       if (cnt != LC_ALL)
  49         {
  50           if (dataset->__names[cnt] == _nl_C_name)
  51             result->__names[cnt] = _nl_C_name;
  52           else
  53             {
  54               result->__names[cnt] = __strdup (dataset->__names[cnt]);
  55               if (result->__names[cnt] == NULL)
  56                 {
  57                   while (cnt-- > 0)
  58                     if (dataset->__names[cnt] != _nl_C_name)
  59                       free ((char *) dataset->__names[cnt]);
  60                   free (result);
  61                   result = NULL;
  62                   break;
  63                 }
  64             }
  65         }
  66
  67   if (result != NULL)
  68     {
  69       for (cnt = 0; cnt < __LC_LAST; ++cnt)
  70         if (cnt != LC_ALL)
  71           {
  72             result->__locales[cnt] = dataset->__locales[cnt];
  73             if (result->__locales[cnt]->usage_count < MAX_USAGE_COUNT)
  74               ++result->__locales[cnt]->usage_count;
  75           }
  76
  77       /* Update the special members.  */
  78       result->__ctype_b = dataset->__ctype_b;
  79       result->__ctype_tolower = dataset->__ctype_tolower;
  80       result->__ctype_toupper = dataset->__ctype_toupper;
  81     }
  82
  83   /* It's done.  */
  84   __libc_lock_unlock (__libc_setlocale_lock);
  85
  86   return result;
  87 }
  88 weak_alias (__duplocale, duplocale)