mbsrtowcs.c revision 129179 
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 129179 2004-05-13 11:20:27Z 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
42	if (ps == NULL)
43		ps = &mbs;
44	return (__mbsrtowcs(dst, src, len, ps));
45}
46
47size_t
48__mbsrtowcs_std(wchar_t * __restrict dst, const char ** __restrict src,
49    size_t len, mbstate_t * __restrict ps)
50{
51	const char *s;
52	size_t nchr;
53	wchar_t wc;
54	int nb;
55
56	s = *src;
57	nchr = 0;
58
59	if (dst == NULL) {
60		for (;;) {
61			if ((nb = (int)__mbrtowc(&wc, s, MB_CUR_MAX, ps)) < 0)
62				/* Invalid sequence - mbrtowc() sets errno. */
63				return ((size_t)-1);
64			else if (nb == 0)
65				return (nchr);
66			s += nb;
67			nchr++;
68		}
69		/*NOTREACHED*/
70	}
71
72	while (len-- > 0) {
73		if ((nb = (int)__mbrtowc(dst, s, MB_CUR_MAX, ps)) < 0) {
74			*src = s;
75			return ((size_t)-1);
76		} else if (nb == 0) {
77			*src = NULL;
78			return (nchr);
79		}
80		s += nb;
81		nchr++;
82		dst++;
83	}
84	*src = s;
85	return (nchr);
86}
87