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/* 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)
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