1 /* $OpenBSD: mbtowc.c,v 1.3 2016/02/27 14:02:13 schwarze Exp $ */
2
3 /*-
4 * Copyright (c) 2002-2004 Tim J. Robbins.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * 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
35 int
mbtowc(wchar_t * __restrict pwc,const char * __restrict s,size_t n)36 mbtowc(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