76 lines
3.0 KiB
C
76 lines
3.0 KiB
C
/* uselocale -- fetch and set the current per-thread locale
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Copyright (C) 2002-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <locale.h>
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#include "localeinfo.h"
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#include <ctype.h>
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/* Switch the current thread's locale to DATASET.
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If DATASET is null, instead just return the current setting.
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The special value LC_GLOBAL_LOCALE is the initial setting
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for all threads, and means the thread uses the global
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setting controlled by `setlocale'. */
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locale_t
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__uselocale (locale_t newloc)
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{
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locale_t oldloc = _NL_CURRENT_LOCALE;
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if (newloc != NULL)
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{
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const locale_t locobj
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= newloc == LC_GLOBAL_LOCALE ? &_nl_global_locale : newloc;
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__libc_tsd_set (locale_t, LOCALE, locobj);
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#ifdef NL_CURRENT_INDIRECT
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/* Now we must update all the per-category thread-local variables to
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point into the new current locale for this thread. The magic
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symbols _nl_current_LC_FOO_used are defined to meaningless values
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if _nl_current_LC_FOO was linked in. By using weak references to
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both symbols and testing the address of _nl_current_LC_FOO_used,
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we can avoid accessing the _nl_current_LC_FOO thread-local
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variable at all when no code referring to it was linked in. We
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need the special bogus symbol because while TLS symbols can be
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weak, there is no reasonable way to test for the default-zero
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value as with a heap symbol (taking the address would just use
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some bogus offset from our thread pointer). */
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# define DEFINE_CATEGORY(category, category_name, items, a) \
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{ \
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extern char _nl_current_##category##_used; \
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weak_extern (_nl_current_##category##_used) \
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weak_extern (_nl_current_##category) \
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if (&_nl_current_##category##_used != 0) \
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_nl_current_##category = &locobj->__locales[category]; \
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}
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# include "categories.def"
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# undef DEFINE_CATEGORY
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#endif
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/* Update the special tsd cache of some locale data. */
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__libc_tsd_set (const uint16_t *, CTYPE_B, (void *) locobj->__ctype_b);
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__libc_tsd_set (const int32_t *, CTYPE_TOLOWER,
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(void *) locobj->__ctype_tolower);
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__libc_tsd_set (const int32_t *, CTYPE_TOUPPER,
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(void *) locobj->__ctype_toupper);
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}
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return oldloc == &_nl_global_locale ? LC_GLOBAL_LOCALE : oldloc;
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}
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libc_hidden_def (__uselocale)
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weak_alias (__uselocale, uselocale)
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