Document problem with NATs in getaddrinfo.
[glibc.git] / locale / duplocale.c
blob63513c539c1e5c55a3e52935c15de8a2a16feb7b
1 /* Duplicate handle for selection of locales.
2 Copyright (C) 1997,2000-2002,2005,2008,2009 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_rwlock_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 /* Handle a special value. */
41 if (dataset == LC_GLOBAL_LOCALE)
42 dataset = &_nl_global_locale;
44 __locale_t result;
45 int cnt;
46 size_t names_len = 0;
48 /* Calculate the total space we need to store all the names. */
49 for (cnt = 0; cnt < __LC_LAST; ++cnt)
50 if (cnt != LC_ALL && dataset->__names[cnt] != _nl_C_name)
51 names_len += strlen (dataset->__names[cnt]) + 1;
53 /* Get memory. */
54 result = malloc (sizeof (struct __locale_struct) + names_len);
56 if (result != NULL)
58 char *namep = (char *) (result + 1);
60 /* We modify global data (the usage counts). */
61 __libc_rwlock_wrlock (__libc_setlocale_lock);
63 for (cnt = 0; cnt < __LC_LAST; ++cnt)
64 if (cnt != LC_ALL)
66 result->__locales[cnt] = dataset->__locales[cnt];
67 if (result->__locales[cnt]->usage_count < MAX_USAGE_COUNT)
68 ++result->__locales[cnt]->usage_count;
70 if (dataset->__names[cnt] == _nl_C_name)
71 result->__names[cnt] = _nl_C_name;
72 else
74 result->__names[cnt] = namep;
75 namep = __stpcpy (namep, dataset->__names[cnt]) + 1;
79 /* Update the special members. */
80 result->__ctype_b = dataset->__ctype_b;
81 result->__ctype_tolower = dataset->__ctype_tolower;
82 result->__ctype_toupper = dataset->__ctype_toupper;
84 /* It's done. */
85 __libc_rwlock_unlock (__libc_setlocale_lock);
88 return result;
90 weak_alias (__duplocale, duplocale)