178344Sobrien/*	$OpenBSD: mbtowc.c,v 1.3 2016/02/27 14:02:13 schwarze Exp $ */
278344Sobrien
398184Sgordon/*-
478344Sobrien * Copyright (c) 2002-2004 Tim J. Robbins.
578344Sobrien * All rights reserved.
678344Sobrien *
7117020Smtm * Redistribution and use in source and binary forms, with or without
8136224Smtm * modification, are permitted provided that the following conditions
978344Sobrien * are met:
1078344Sobrien * 1. Redistributions of source code must retain the above copyright
1178344Sobrien *    notice, this list of conditions and the following disclaimer.
1278344Sobrien * 2. Redistributions in binary form must reproduce the above copyright
13230099Sdougb *    notice, this list of conditions and the following disclaimer in the
14197144Shrs *    documentation and/or other materials provided with the distribution.
1578344Sobrien *
16197144Shrs * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17197144Shrs * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18197144Shrs * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19197144Shrs * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
2098184Sgordon * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2178344Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29
30#include <stdlib.h>
31#include <string.h>
32#include <wchar.h>
33#include <errno.h>
34
35int
36mbtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n)
37{
38	static mbstate_t mbs;
39	size_t rval;
40
41	if (s == NULL) {
42		/* No support for state dependent encodings. */
43		memset(&mbs, 0, sizeof(mbs));
44		return (0);
45	}
46	rval = mbrtowc(pwc, s, n, &mbs);
47
48	switch (rval) {
49	case (size_t)-2:
50		errno = EILSEQ;
51		/* FALLTHROUGH */
52	case (size_t)-1:
53		return -1;
54	default:
55		return (int)rval;
56	}
57}
58