1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright 2013 Garrett D'Amore <garrett@damore.org>
5 * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
6 * Copyright (c) 2002-2004 Tim J. Robbins.
7 *
8 * Copyright (c) 2011 The FreeBSD Foundation
9 *
10 * Portions of this software were developed by David Chisnall
11 * under sponsorship from the FreeBSD Foundation.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <errno.h>
36#include <limits.h>
37#include <stdlib.h>
38#include <wchar.h>
39#include "mblocal.h"
40
41size_t
42mbsnrtowcs_l(wchar_t * __restrict dst, const char ** __restrict src,
43    size_t nms, size_t len, mbstate_t * __restrict ps, locale_t locale)
44{
45	FIX_LOCALE(locale);
46	if (ps == NULL)
47		ps = &(XLOCALE_CTYPE(locale)->mbsnrtowcs);
48	return (XLOCALE_CTYPE(locale)->__mbsnrtowcs(dst, src, nms, len, ps));
49}
50size_t
51mbsnrtowcs(wchar_t * __restrict dst, const char ** __restrict src,
52    size_t nms, size_t len, mbstate_t * __restrict ps)
53{
54	return mbsnrtowcs_l(dst, src, nms, len, ps, __get_locale());
55}
56
57size_t
58__mbsnrtowcs_std(wchar_t * __restrict dst, const char ** __restrict src,
59    size_t nms, size_t len, mbstate_t * __restrict ps,
60    mbrtowc_pfn_t pmbrtowc)
61{
62	const char *s;
63	size_t nchr;
64	wchar_t wc;
65	size_t nb;
66
67	s = *src;
68	nchr = 0;
69
70	if (dst == NULL) {
71		for (;;) {
72			if ((nb = pmbrtowc(&wc, s, nms, ps)) == (size_t)-1)
73				/* Invalid sequence - mbrtowc() sets errno. */
74				return ((size_t)-1);
75			else if (nb == 0 || nb == (size_t)-2)
76				return (nchr);
77			s += nb;
78			nms -= nb;
79			nchr++;
80		}
81		/*NOTREACHED*/
82	}
83
84	while (len-- > 0) {
85		if ((nb = pmbrtowc(dst, s, nms, ps)) == (size_t)-1) {
86			*src = s;
87			return ((size_t)-1);
88		} else if (nb == (size_t)-2) {
89			*src = s + nms;
90			return (nchr);
91		} else if (nb == 0) {
92			*src = NULL;
93			return (nchr);
94		}
95		s += nb;
96		nms -= nb;
97		nchr++;
98		dst++;
99	}
100	*src = s;
101	return (nchr);
102}
103