1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 * All rights reserved.
10 * Portions of this software were developed by David Chisnall
11 * under sponsorship from the FreeBSD Foundation.
12 * All rights reserved.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 *    notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 *    notice, this list of conditions and the following disclaimer in the
21 *    documentation and/or other materials provided with the distribution.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD$");
38
39#include <errno.h>
40#include <limits.h>
41#include <stdlib.h>
42#include <wchar.h>
43#include "mblocal.h"
44
45size_t
46mbsnrtowcs_l(wchar_t * __restrict dst, const char ** __restrict src,
47    size_t nms, size_t len, mbstate_t * __restrict ps, locale_t locale)
48{
49	FIX_LOCALE(locale);
50	if (ps == NULL)
51		ps = &locale->mbsnrtowcs;
52	return (XLOCALE_CTYPE(locale)->__mbsnrtowcs(dst, src, nms, len, ps));
53}
54size_t
55mbsnrtowcs(wchar_t * __restrict dst, const char ** __restrict src,
56    size_t nms, size_t len, mbstate_t * __restrict ps)
57{
58	return mbsnrtowcs_l(dst, src, nms, len, ps, __get_locale());
59}
60
61size_t
62__mbsnrtowcs_std(wchar_t * __restrict dst, const char ** __restrict src,
63    size_t nms, size_t len, mbstate_t * __restrict ps,
64    mbrtowc_pfn_t pmbrtowc)
65{
66	const char *s;
67	size_t nchr;
68	wchar_t wc;
69	size_t nb;
70
71	s = *src;
72	nchr = 0;
73
74	if (dst == NULL) {
75		for (;;) {
76			if ((nb = pmbrtowc(&wc, s, nms, ps)) == (size_t)-1)
77				/* Invalid sequence - mbrtowc() sets errno. */
78				return ((size_t)-1);
79			else if (nb == 0 || nb == (size_t)-2)
80				return (nchr);
81			s += nb;
82			nms -= nb;
83			nchr++;
84		}
85		/*NOTREACHED*/
86	}
87
88	while (len-- > 0) {
89		if ((nb = pmbrtowc(dst, s, nms, ps)) == (size_t)-1) {
90			*src = s;
91			return ((size_t)-1);
92		} else if (nb == (size_t)-2) {
93			*src = s + nms;
94			return (nchr);
95		} else if (nb == 0) {
96			*src = NULL;
97			return (nchr);
98		}
99		s += nb;
100		nms -= nb;
101		nchr++;
102		dst++;
103	}
104	*src = s;
105	return (nchr);
106}
107