mbsrtowcs.c revision 127944 
1/*-
2 * Copyright (c) 2002-2004 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 127944 2004-04-06 13:14:03Z 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)
38{
39	static mbstate_t mbs;
40	const char *s;
41	size_t nchr;
42	wchar_t wc;
43	int nb;
44
45	s = *src;
46	nchr = 0;
47
48	if (ps == NULL)
49		ps = &mbs;
50	if (dst == NULL) {
51		for (;;) {
52			if ((nb = (int)mbrtowc(&wc, s, MB_CUR_MAX, ps)) < 0)
53				/* Invalid sequence - mbrtowc() sets errno. */
54				return ((size_t)-1);
55			else if (nb == 0)
56				return (nchr);
57			s += nb;
58			nchr++;
59		}
60		/*NOTREACHED*/
61	}
62
63	while (len-- > 0) {
64		if ((nb = (int)mbrtowc(dst, s, MB_CUR_MAX, ps)) < 0) {
65			*src = s;
66			return ((size_t)-1);
67		} else if (nb == 0) {
68			*src = NULL;
69			return (nchr);
70		}
71		s += nb;
72		nchr++;
73		dst++;
74	}
75	*src = s;
76	return (nchr);
77}
78