mbsrtowcs.c revision 103012 
1/*-
2 * Copyright (c) 2002 Tim J. Robbins.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/lib/libc/locale/mbsrtowcs.c 103012 2002-09-06 11:24:06Z tjr $");
29
30#include <errno.h>
31#include <limits.h>
32#include <stdlib.h>
33#include <wchar.h>
34
35size_t
36mbsrtowcs(wchar_t * __restrict dst, const char ** __restrict src, size_t len,
37    mbstate_t * __restrict ps __unused)
38{
39	const char *s;
40	size_t nchr;
41	wchar_t wc;
42	int nb;
43
44	s = *src;
45	nchr = 0;
46
47	if (dst == NULL) {
48		for (;;) {
49			if ((nb = (int)mbrtowc(&wc, s, MB_CUR_MAX, NULL)) < 0)
50				/* Invalid sequence - mbrtowc() sets errno. */
51				return ((size_t)-1);
52			else if (nb == 0)
53				return (nchr);
54			s += nb;
55			nchr++;
56		}
57		/*NOTREACHED*/
58	}
59
60	while (len-- > 0) {
61		if ((nb = (int)mbrtowc(dst, s, MB_CUR_MAX, NULL)) < 0) {
62			*src = s;
63			return ((size_t)-1);
64		} else if (nb == 0) {
65			*src = NULL;
66			return (nchr);
67		}
68		s += nb;
69		nchr++;
70		dst++;
71	}
72	*src = s;
73	return (nchr);
74}
75