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[glibc.git] / locale / duplocale.c
blob2fe23fc6ad248883fa9898149fcc29c60f343283
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.
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.
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.
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. */
21 #include <locale.h>
22 #include <bits/libc-lock.h>
23 #include <stdlib.h>
25 #include <localeinfo.h>
28 /* Lock for protecting global data. */
29 __libc_lock_define (extern , __libc_setlocale_lock)
32 __locale_t
33 __duplocale (__locale_t dataset)
35 __locale_t result;
37 /* We modify global data. */
38 __libc_lock_lock (__libc_setlocale_lock);
40 /* Get memory. */
41 result = (__locale_t) malloc (sizeof (struct __locale_struct));
42 if (result != NULL)
44 int cnt;
45 for (cnt = 0; cnt < __LC_LAST; ++cnt)
46 if (cnt != LC_ALL)
48 result->__locales[cnt] = dataset->__locales[cnt];
49 if (result->__locales[cnt]->usage_count < MAX_USAGE_COUNT)
50 ++result->__locales[cnt]->usage_count;
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;
59 /* It's done. */
60 __libc_lock_unlock (__libc_setlocale_lock);
62 return result;