mbsrtowcs.c revision 129154 
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 129154 2004-05-12 14:26:54Z tjr $");
29
30#include <errno.h>
31#include <limits.h>
32#include <stdlib.h>
33#include <wchar.h>
34#include "mblocal.h"
35
36size_t
37mbsrtowcs(wchar_t * __restrict dst, const char ** __restrict src, size_t len,
38    mbstate_t * __restrict ps)
39{
40	static mbstate_t mbs;
41	const char *s;
42	size_t nchr;
43	wchar_t wc;
44	int nb;
45
46	s = *src;
47	nchr = 0;
48
49	if (ps == NULL)
50		ps = &mbs;
51	if (dst == NULL) {
52		for (;;) {
53			if ((nb = (int)__mbrtowc(&wc, s, MB_CUR_MAX, ps)) < 0)
54				/* Invalid sequence - mbrtowc() sets errno. */
55				return ((size_t)-1);
56			else if (nb == 0)
57				return (nchr);
58			s += nb;
59			nchr++;
60		}
61		/*NOTREACHED*/
62	}
63
64	while (len-- > 0) {
65		if ((nb = (int)__mbrtowc(dst, s, MB_CUR_MAX, ps)) < 0) {
66			*src = s;
67			return ((size_t)-1);
68		} else if (nb == 0) {
69			*src = NULL;
70			return (nchr);
71		}
72		s += nb;
73		nchr++;
74		dst++;
75	}
76	*src = s;
77	return (nchr);
78}
79