1/*	$OpenBSD: newlocale.c,v 1.2 2019/03/29 12:34:44 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 <string.h>
21
22#include "rune.h"
23
24locale_t
25newlocale(int mask, const char *locname, locale_t oldloc)
26{
27	int	 ic, flag;
28
29	/* Invalid input. */
30	if (locname == NULL || mask & ~LC_ALL_MASK) {
31		errno = EINVAL;
32		return _LOCALE_NONE;
33	}
34
35	/* Check the syntax for all selected categories. */
36	for (ic = flag = 1; ic < _LC_LAST; ic++) {
37		flag <<= 1;
38		if (ic != LC_CTYPE && mask & flag &&
39		    _get_locname(ic, locname) == NULL) {
40			errno = ENOENT;
41			return _LOCALE_NONE;
42		}
43	}
44
45	/* Only character encoding has thread-specific effects. */
46	if ((mask & LC_CTYPE_MASK) == 0)
47		return oldloc == _LOCALE_UTF8 ? _LOCALE_UTF8 : _LOCALE_C;
48
49	/* The following may initialize UTF-8 for later use. */
50	if ((locname = _get_locname(LC_CTYPE, locname)) == NULL) {
51		errno = ENOENT;
52		return _LOCALE_NONE;
53	}
54	return strchr(locname, '.') == NULL ? _LOCALE_C : _LOCALE_UTF8;
55}
56