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/* hard-locale.c -- Determine whether a locale is hard.
Copyright (C) 1997-1999, 2002-2004, 2006-2007, 2009-2018 Free Software
Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include "hard-locale.h"
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#ifdef __GLIBC__
# define GLIBC_VERSION __GLIBC__
#elif defined __UCLIBC__
# define GLIBC_VERSION 2
#else
# define GLIBC_VERSION 0
#endif
/* Return true if the current CATEGORY locale is hard, i.e. if you
can't get away with assuming traditional C or POSIX behavior. */
bool
hard_locale (int category)
{
bool hard = true;
char const *p = setlocale (category, NULL);
if (p)
{
if (2 <= GLIBC_VERSION)
{
if (strcmp (p, "C") == 0 || strcmp (p, "POSIX") == 0)
hard = false;
}
else
{
char *locale = strdup (p);
if (locale)
{
/* Temporarily set the locale to the "C" and "POSIX" locales
to find their names, so that we can determine whether one
or the other is the caller's locale. */
if (((p = setlocale (category, "C"))
&& strcmp (p, locale) == 0)
|| ((p = setlocale (category, "POSIX"))
&& strcmp (p, locale) == 0))
hard = false;
/* Restore the caller's locale. */
setlocale (category, locale);
free (locale);
}
}
}
return hard;
}
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