mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-27 13:10:29 +00:00
76 lines
3.0 KiB
C
76 lines
3.0 KiB
C
/* uselocale -- fetch and set the current per-thread locale
|
|
Copyright (C) 2002-2017 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <locale.h>
|
|
#include "localeinfo.h"
|
|
#include <ctype.h>
|
|
|
|
/* Switch the current thread's locale to DATASET.
|
|
If DATASET is null, instead just return the current setting.
|
|
The special value LC_GLOBAL_LOCALE is the initial setting
|
|
for all threads, and means the thread uses the global
|
|
setting controlled by `setlocale'. */
|
|
locale_t
|
|
__uselocale (locale_t newloc)
|
|
{
|
|
locale_t oldloc = _NL_CURRENT_LOCALE;
|
|
|
|
if (newloc != NULL)
|
|
{
|
|
const locale_t locobj
|
|
= newloc == LC_GLOBAL_LOCALE ? &_nl_global_locale : newloc;
|
|
__libc_tsd_set (__locale_t, LOCALE, locobj);
|
|
|
|
#ifdef NL_CURRENT_INDIRECT
|
|
/* Now we must update all the per-category thread-local variables to
|
|
point into the new current locale for this thread. The magic
|
|
symbols _nl_current_LC_FOO_used are defined to meaningless values
|
|
if _nl_current_LC_FOO was linked in. By using weak references to
|
|
both symbols and testing the address of _nl_current_LC_FOO_used,
|
|
we can avoid accessing the _nl_current_LC_FOO thread-local
|
|
variable at all when no code referring to it was linked in. We
|
|
need the special bogus symbol because while TLS symbols can be
|
|
weak, there is no reasonable way to test for the default-zero
|
|
value as with a heap symbol (taking the address would just use
|
|
some bogus offset from our thread pointer). */
|
|
|
|
# define DEFINE_CATEGORY(category, category_name, items, a) \
|
|
{ \
|
|
extern char _nl_current_##category##_used; \
|
|
weak_extern (_nl_current_##category##_used) \
|
|
weak_extern (_nl_current_##category) \
|
|
if (&_nl_current_##category##_used != 0) \
|
|
_nl_current_##category = &locobj->__locales[category]; \
|
|
}
|
|
# include "categories.def"
|
|
# undef DEFINE_CATEGORY
|
|
#endif
|
|
|
|
/* Update the special tsd cache of some locale data. */
|
|
__libc_tsd_set (const uint16_t *, CTYPE_B, (void *) locobj->__ctype_b);
|
|
__libc_tsd_set (const int32_t *, CTYPE_TOLOWER,
|
|
(void *) locobj->__ctype_tolower);
|
|
__libc_tsd_set (const int32_t *, CTYPE_TOUPPER,
|
|
(void *) locobj->__ctype_toupper);
|
|
}
|
|
|
|
return oldloc == &_nl_global_locale ? LC_GLOBAL_LOCALE : oldloc;
|
|
}
|
|
libc_hidden_def (__uselocale)
|
|
weak_alias (__uselocale, uselocale)
|