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