1/*	$OpenBSD: uselocale.c,v 1.1 2017/09/05 03:16:13 schwarze Exp $ */
2/*
3 * Copyright (c) 2017 Ingo Schwarze <schwarze@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#include <errno.h>
19#include <locale.h>
20#include <tib.h>
21
22#include "rune.h"
23
24locale_t
25uselocale(locale_t newloc)
26{
27	struct tib		*tib;
28	_RuneLocale		*oldrunes;
29
30	tib = TIB_GET();
31	oldrunes = tib->tib_locale;
32
33	if (newloc == _LOCALE_UTF8 && _Utf8RuneLocale != NULL)
34		tib->tib_locale = _Utf8RuneLocale;
35	else if (newloc == _LOCALE_C)
36		tib->tib_locale = &_DefaultRuneLocale;
37	else if (newloc == LC_GLOBAL_LOCALE)
38		tib->tib_locale = NULL;
39	else if (newloc != _LOCALE_NONE) {
40		errno = EINVAL;
41		return _LOCALE_NONE;
42	}
43	return oldrunes == NULL ? LC_GLOBAL_LOCALE :
44	    oldrunes == _Utf8RuneLocale ? _LOCALE_UTF8 : _LOCALE_C;
45}
46