1/*-
2 * Copyright 2013 Garrett D'Amore <garrett@damore.org>
3 * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
4 * Copyright (c) 2002-2004 Tim J. Robbins.
5 * All rights reserved.
6 *
7 * Copyright (c) 2011 The FreeBSD Foundation
8 * All rights reserved.
9 * Portions of this software were developed by David Chisnall
10 * under sponsorship from the FreeBSD Foundation.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD$");
36
37#include <limits.h>
38#include <stdlib.h>
39#include <string.h>
40#include <wchar.h>
41#include "mblocal.h"
42
43size_t
44wcsnrtombs_l(char * __restrict dst, const wchar_t ** __restrict src, size_t nwc,
45    size_t len, mbstate_t * __restrict ps, locale_t locale)
46{
47	FIX_LOCALE(locale);
48	if (ps == NULL)
49		ps = &locale->wcsnrtombs;
50	return (XLOCALE_CTYPE(locale)->__wcsnrtombs(dst, src, nwc, len, ps));
51}
52size_t
53wcsnrtombs(char * __restrict dst, const wchar_t ** __restrict src, size_t nwc,
54    size_t len, mbstate_t * __restrict ps)
55{
56	return wcsnrtombs_l(dst, src, nwc, len, ps, __get_locale());
57}
58
59
60size_t
61__wcsnrtombs_std(char * __restrict dst, const wchar_t ** __restrict src,
62    size_t nwc, size_t len, mbstate_t * __restrict ps,
63    wcrtomb_pfn_t pwcrtomb)
64{
65	mbstate_t mbsbak;
66	char buf[MB_LEN_MAX];
67	const wchar_t *s;
68	size_t nbytes;
69	size_t nb;
70
71	s = *src;
72	nbytes = 0;
73
74	if (dst == NULL) {
75		while (nwc-- > 0) {
76			if ((nb = pwcrtomb(buf, *s, ps)) == (size_t)-1)
77				/* Invalid character - wcrtomb() sets errno. */
78				return ((size_t)-1);
79			else if (*s == L'\0')
80				return (nbytes + nb - 1);
81			s++;
82			nbytes += nb;
83		}
84		return (nbytes);
85	}
86
87	while (len > 0 && nwc-- > 0) {
88		if (len > (size_t)MB_CUR_MAX) {
89			/* Enough space to translate in-place. */
90			if ((nb = pwcrtomb(dst, *s, ps)) == (size_t)-1) {
91				*src = s;
92				return ((size_t)-1);
93			}
94		} else {
95			/*
96			 * May not be enough space; use temp. buffer.
97			 *
98			 * We need to save a copy of the conversion state
99			 * here so we can restore it if the multibyte
100			 * character is too long for the buffer.
101			 */
102			mbsbak = *ps;
103			if ((nb = pwcrtomb(buf, *s, ps)) == (size_t)-1) {
104				*src = s;
105				return ((size_t)-1);
106			}
107			if (nb > (int)len) {
108				/* MB sequence for character won't fit. */
109				*ps = mbsbak;
110				break;
111			}
112			memcpy(dst, buf, nb);
113		}
114		if (*s == L'\0') {
115			*src = NULL;
116			return (nbytes + nb - 1);
117		}
118		s++;
119		dst += nb;
120		len -= nb;
121		nbytes += nb;
122	}
123	*src = s;
124	return (nbytes);
125}
126