mbtowc.c revision 331722 
1/*-
2 * Copyright (c) 2002-2004 Tim J. Robbins.
3 * All rights reserved.
4 *
5 * Copyright (c) 2011 The FreeBSD Foundation
6 * All rights reserved.
7 * Portions of this software were developed by David Chisnall
8 * under sponsorship from the FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: stable/11/lib/libc/locale/mbtowc.c 331722 2018-03-29 02:50:57Z eadler $");
34
35#include <errno.h>
36#include <stdlib.h>
37#include <wchar.h>
38#include "mblocal.h"
39
40int
41mbtowc_l(wchar_t * __restrict pwc, const char * __restrict s, size_t n, locale_t locale)
42{
43	static const mbstate_t initial;
44	size_t rval;
45	FIX_LOCALE(locale);
46
47	if (s == NULL) {
48		/* No support for state dependent encodings. */
49		locale->mbtowc = initial;
50		return (0);
51	}
52	rval = XLOCALE_CTYPE(locale)->__mbrtowc(pwc, s, n, &locale->mbtowc);
53	switch (rval) {
54	case (size_t)-2:
55		errno = EILSEQ;
56		/* FALLTHROUGH */
57	case (size_t)-1:
58		return (-1);
59	default:
60		return ((int)rval);
61	}
62}
63int
64mbtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n)
65{
66	return mbtowc_l(pwc, s, n, __get_locale());
67}
68