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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 either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
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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