1/*-
2 * Copyright (c) 2002-2004 Tim J. Robbins.
3 * All rights reserved.
4 *
5 * Copyright (c) 2011 The FreeBSD Foundation
6 * All rights reserved.
7 * Portions of this software were developed by David Chisnall
8 * under sponsorship from the FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD$");
34
35#include <limits.h>
36#include <stdlib.h>
37#include <string.h>
38#include <wchar.h>
39#include "mblocal.h"
40
41size_t
42wcsnrtombs_l(char * __restrict dst, const wchar_t ** __restrict src, size_t nwc,
43    size_t len, mbstate_t * __restrict ps, locale_t locale)
44{
45	FIX_LOCALE(locale);
46	if (ps == NULL)
47		ps = &locale->wcsnrtombs;
48	return (XLOCALE_CTYPE(locale)->__wcsnrtombs(dst, src, nwc, len, ps));
49}
50size_t
51wcsnrtombs(char * __restrict dst, const wchar_t ** __restrict src, size_t nwc,
52    size_t len, mbstate_t * __restrict ps)
53{
54	return wcsnrtombs_l(dst, src, nwc, len, ps, __get_locale());
55}
56
57
58size_t
59__wcsnrtombs_std(char * __restrict dst, const wchar_t ** __restrict src,
60    size_t nwc, size_t len, mbstate_t * __restrict ps)
61{
62	mbstate_t mbsbak;
63	char buf[MB_LEN_MAX];
64	const wchar_t *s;
65	size_t nbytes;
66	size_t nb;
67	struct xlocale_ctype *l = XLOCALE_CTYPE(__get_locale());
68
69	s = *src;
70	nbytes = 0;
71
72	if (dst == NULL) {
73		while (nwc-- > 0) {
74			if ((nb = l->__wcrtomb(buf, *s, ps)) == (size_t)-1)
75				/* Invalid character - wcrtomb() sets errno. */
76				return ((size_t)-1);
77			else if (*s == L'\0')
78				return (nbytes + nb - 1);
79			s++;
80			nbytes += nb;
81		}
82		return (nbytes);
83	}
84
85	while (len > 0 && nwc-- > 0) {
86		if (len > (size_t)MB_CUR_MAX) {
87			/* Enough space to translate in-place. */
88			if ((nb = l->__wcrtomb(dst, *s, ps)) == (size_t)-1) {
89				*src = s;
90				return ((size_t)-1);
91			}
92		} else {
93			/*
94			 * May not be enough space; use temp. buffer.
95			 *
96			 * We need to save a copy of the conversion state
97			 * here so we can restore it if the multibyte
98			 * character is too long for the buffer.
99			 */
100			mbsbak = *ps;
101			if ((nb = l->__wcrtomb(buf, *s, ps)) == (size_t)-1) {
102				*src = s;
103				return ((size_t)-1);
104			}
105			if (nb > (int)len) {
106				/* MB sequence for character won't fit. */
107				*ps = mbsbak;
108				break;
109			}
110			memcpy(dst, buf, nb);
111		}
112		if (*s == L'\0') {
113			*src = NULL;
114			return (nbytes + nb - 1);
115		}
116		s++;
117		dst += nb;
118		len -= nb;
119		nbytes += nb;
120	}
121	*src = s;
122	return (nbytes);
123}
124