mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 06:20:06 +00:00
513331b788
Protect the global locale from being modified while we compute the size of the locale category names. That allows the use of the global locale in a single thread, while all other threads use the thread safe locale functions.
91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/* Duplicate handle for selection of locales.
|
|
Copyright (C) 1997-2024 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <locale.h>
|
|
#include <libc-lock.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include <localeinfo.h>
|
|
|
|
|
|
/* Lock for protecting global data. */
|
|
__libc_rwlock_define (extern , __libc_setlocale_lock attribute_hidden)
|
|
|
|
|
|
locale_t
|
|
__duplocale (locale_t dataset)
|
|
{
|
|
/* This static object is returned for newlocale (LC_ALL_MASK, "C"). */
|
|
if (dataset == _nl_C_locobj_ptr)
|
|
return dataset;
|
|
|
|
/* Handle a special value. */
|
|
if (dataset == LC_GLOBAL_LOCALE)
|
|
dataset = &_nl_global_locale;
|
|
|
|
locale_t result;
|
|
int cnt;
|
|
size_t names_len = 0;
|
|
|
|
/* If dataset points to _nl_global_locale, we need to prevent other
|
|
threads from modifying it. We also modify global data below (the
|
|
usage counts). */
|
|
__libc_rwlock_wrlock (__libc_setlocale_lock);
|
|
|
|
/* Calculate the total space we need to store all the names. */
|
|
for (cnt = 0; cnt < __LC_LAST; ++cnt)
|
|
if (cnt != LC_ALL && dataset->__names[cnt] != _nl_C_name)
|
|
names_len += strlen (dataset->__names[cnt]) + 1;
|
|
|
|
/* Get memory. */
|
|
result = malloc (sizeof (struct __locale_struct) + names_len);
|
|
|
|
if (result != NULL)
|
|
{
|
|
char *namep = (char *) (result + 1);
|
|
|
|
for (cnt = 0; cnt < __LC_LAST; ++cnt)
|
|
if (cnt != LC_ALL)
|
|
{
|
|
result->__locales[cnt] = dataset->__locales[cnt];
|
|
if (result->__locales[cnt]->usage_count < MAX_USAGE_COUNT)
|
|
++result->__locales[cnt]->usage_count;
|
|
|
|
if (dataset->__names[cnt] == _nl_C_name)
|
|
result->__names[cnt] = _nl_C_name;
|
|
else
|
|
{
|
|
result->__names[cnt] = namep;
|
|
namep = __stpcpy (namep, dataset->__names[cnt]) + 1;
|
|
}
|
|
}
|
|
|
|
/* Update the special members. */
|
|
result->__ctype_b = dataset->__ctype_b;
|
|
result->__ctype_tolower = dataset->__ctype_tolower;
|
|
result->__ctype_toupper = dataset->__ctype_toupper;
|
|
}
|
|
|
|
/* It's done. */
|
|
__libc_rwlock_unlock (__libc_setlocale_lock);
|
|
|
|
return result;
|
|
}
|
|
weak_alias (__duplocale, duplocale)
|