1/* Duplicate handle for selection of locales.
2 Copyright (C) 1997-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <locale.h>
20#include <libc-lock.h>
21#include <stdlib.h>
22#include <string.h>
23
24#include <localeinfo.h>
25
26
27/* Lock for protecting global data. */
28__libc_rwlock_define (extern , __libc_setlocale_lock attribute_hidden)
29
30
31locale_t
32__duplocale (locale_t dataset)
33{
34 /* This static object is returned for newlocale (LC_ALL_MASK, "C"). */
35 if (dataset == _nl_C_locobj_ptr)
36 return dataset;
37
38 /* Handle a special value. */
39 if (dataset == LC_GLOBAL_LOCALE)
40 dataset = &_nl_global_locale;
41
42 locale_t result;
43 int cnt;
44 size_t names_len = 0;
45
46 /* Calculate the total space we need to store all the names. */
47 for (cnt = 0; cnt < __LC_LAST; ++cnt)
48 if (cnt != LC_ALL && dataset->__names[cnt] != _nl_C_name)
49 names_len += strlen (dataset->__names[cnt]) + 1;
50
51 /* Get memory. */
52 result = malloc (sizeof (struct __locale_struct) + names_len);
53
54 if (result != NULL)
55 {
56 char *namep = (char *) (result + 1);
57
58 /* We modify global data (the usage counts). */
59 __libc_rwlock_wrlock (__libc_setlocale_lock);
60
61 for (cnt = 0; cnt < __LC_LAST; ++cnt)
62 if (cnt != LC_ALL)
63 {
64 result->__locales[cnt] = dataset->__locales[cnt];
65 if (result->__locales[cnt]->usage_count < MAX_USAGE_COUNT)
66 ++result->__locales[cnt]->usage_count;
67
68 if (dataset->__names[cnt] == _nl_C_name)
69 result->__names[cnt] = _nl_C_name;
70 else
71 {
72 result->__names[cnt] = namep;
73 namep = __stpcpy (namep, dataset->__names[cnt]) + 1;
74 }
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 /* It's done. */
83 __libc_rwlock_unlock (__libc_setlocale_lock);
84 }
85
86 return result;
87}
88weak_alias (__duplocale, duplocale)
89