projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 30c14c31 RM |
1 | /* uselocale -- fetch and set the current per-thread locale |
| 2 | Copyright (C) 2002 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, write to the Free | |
| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 18 | 02111-1307 USA. */ | |
| 19 | ||
| 20 | #include <locale.h> | |
| 21 | #include "localeinfo.h" | |
| 22 | ||
| 30c14c31 RM |
23 | /* Switch the current thread's locale to DATASET. |
| 24 | If DATASET is null, instead just return the current setting. | |
| 25 | The special value LC_GLOBAL_LOCALE is the initial setting | |
| 26 | for all threads, and means the thread uses the global | |
| 27 | setting controlled by `setlocale'. */ | |
| 28 | locale_t | |
| 29 | __uselocale (locale_t newloc) | |
| 30 | { | |
| 31 | if (newloc == NULL) | |
| 32 | { | |
| 33 | locale_t loc = __libc_tsd_get (LOCALE); | |
| 34 | return loc == &_nl_global_locale ? LC_GLOBAL_LOCALE : loc; | |
| 35 | } | |
| 1a0d874e | 36 | else |
| 30c14c31 | 37 | { |
| 1a0d874e RM |
38 | const locale_t locobj |
| 39 | = newloc == LC_GLOBAL_LOCALE ? &_nl_global_locale : newloc; | |
| 40 | __libc_tsd_set (LOCALE, locobj); | |
| 41 | ||
| 42 | #ifdef NL_CURRENT_INDIRECT | |
| 43 | /* Now we must update all the per-category thread-local variables to | |
| 44 | point into the new current locale for this thread. The magic | |
| 45 | symbols _nl_current_LC_FOO_used are defined to meaningless values | |
| 46 | if _nl_current_LC_FOO was linked in. By using weak references to | |
| 47 | both symbols and testing the address of _nl_current_LC_FOO_used, | |
| 48 | we can avoid accessing the _nl_current_LC_FOO thread-local | |
| 49 | variable at all when no code referring to it was linked in. We | |
| 50 | need the special bogus symbol because while TLS symbols can be | |
| 51 | weak, there is no reasonable way to test for the default-zero | |
| 52 | value as with a heap symbol (taking the address would just use | |
| 53 | some bogus offset from our thread pointer). */ | |
| 54 | ||
| 55 | # define DEFINE_CATEGORY(category, category_name, items, a) \ | |
| 56 | { \ | |
| 57 | extern char _nl_current_##category##_used; \ | |
| 58 | weak_extern (_nl_current_##category##_used) \ | |
| 59 | weak_extern (_nl_current_##category) \ | |
| 60 | if (&_nl_current_##category##_used != 0) \ | |
| 61 | _nl_current_##category = &locobj->__locales[category]; \ | |
| 62 | } | |
| 63 | # include "categories.def" | |
| 64 | # undef DEFINE_CATEGORY | |
| 65 | #endif | |
| 30c14c31 | 66 | } |
| 1a0d874e | 67 | |
| 30c14c31 RM |
68 | return newloc; |
| 69 | } | |
| 70 | weak_alias (__uselocale, uselocale) |