wcsrtombs.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/wcsrtombs.c 103012 2002-09-06 11:24:06Z tjr $");
29
30#include <errno.h>
31#include <limits.h>
32#include <stdlib.h>
33#include <string.h>
34#include <wchar.h>
35
36size_t
37wcsrtombs(char * __restrict dst, const wchar_t ** __restrict src, size_t len,
38    mbstate_t * __restrict ps __unused)
39{
40	char buf[MB_LEN_MAX];
41	const wchar_t *s;
42	size_t nbytes;
43	int nb;
44
45	s = *src;
46	nbytes = 0;
47
48	if (dst == NULL) {
49		for (;;) {
50			if ((nb = (int)wcrtomb(buf, *s, NULL)) < 0)
51				/* Invalid character - wcrtomb() sets errno. */
52				return ((size_t)-1);
53			else if (*s == L'\0')
54				return (nbytes + nb - 1);
55			s++;
56			nbytes += nb;
57		}
58		/*NOTREACHED*/
59	}
60
61	while (len > 0) {
62		if (len > (size_t)MB_CUR_MAX) {
63			/* Enough space to translate in-place. */
64			if ((nb = (int)wcrtomb(dst, *s, NULL)) < 0) {
65				*src = s;
66				return ((size_t)-1);
67			}
68		} else {
69			/* May not be enough space; use temp. buffer. */
70			if ((nb = (int)wcrtomb(buf, *s, NULL)) < 0) {
71				*src = s;
72				return ((size_t)-1);
73			}
74			if (nb > (int)len)
75				/* MB sequence for character won't fit. */
76				break;
77			memcpy(dst, buf, nb);
78		}
79		if (*s == L'\0') {
80			*src = NULL;
81			return (nbytes + nb - 1);
82		}
83		s++;
84		dst += nb;
85		len -= nb;
86		nbytes += nb;
87	}
88	*src = s;
89	return (nbytes);
90}
91