* rt/mqueue.h (mq_timedreceive, mq_timedsend): Fix nonnull argument
[glibc.git] / locale / duplocale.c
blob0cec09f63af7f4bb0ad56ebb7e01078f94f2b316
1 /* Duplicate handle for selection of locales.
2 Copyright (C) 1997, 2000, 2001, 2002, 2005 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>
24 #include <string.h>
26 #include <localeinfo.h>
29 /* Lock for protecting global data. */
30 __libc_lock_define (extern , __libc_setlocale_lock attribute_hidden)
33 __locale_t
34 __duplocale (__locale_t dataset)
36 /* This static object is returned for newlocale (LC_ALL_MASK, "C"). */
37 if (dataset == _nl_C_locobj_ptr)
38 return dataset;
40 __locale_t result;
41 int cnt;
42 size_t names_len = 0;
44 /* Calculate the total space we need to store all the names. */
45 for (cnt = 0; cnt < __LC_LAST; ++cnt)
46 if (cnt != LC_ALL && dataset->__names[cnt] != _nl_C_name)
47 names_len += strlen (dataset->__names[cnt]) + 1;
49 /* Get memory. */
50 result = malloc (sizeof (struct __locale_struct) + names_len);
52 if (result != NULL)
54 char *namep = (char *) (result + 1);
56 /* We modify global data (the usage counts). */
57 __libc_lock_lock (__libc_setlocale_lock);
59 for (cnt = 0; cnt < __LC_LAST; ++cnt)
60 if (cnt != LC_ALL)
62 result->__locales[cnt] = dataset->__locales[cnt];
63 if (result->__locales[cnt]->usage_count < MAX_USAGE_COUNT)
64 ++result->__locales[cnt]->usage_count;
66 if (dataset->__names[cnt] == _nl_C_name)
67 result->__names[cnt] = _nl_C_name;
68 else
70 result->__names[cnt] = namep;
71 namep = __stpcpy (namep, dataset->__names[cnt]) + 1;
75 /* Update the special members. */
76 result->__ctype_b = dataset->__ctype_b;
77 result->__ctype_tolower = dataset->__ctype_tolower;
78 result->__ctype_toupper = dataset->__ctype_toupper;
80 /* It's done. */
81 __libc_lock_unlock (__libc_setlocale_lock);
84 return result;
86 weak_alias (__duplocale, duplocale)