| 1 | /* Duplicate handle for selection of locales. |
|---|---|
| 2 | Copyright (C) 1997-2022 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 | |
| 31 | locale_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 (size: 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 | } |
| 88 | weak_alias (__duplocale, duplocale) |
| 89 |