mbsnrtowcs.c revision 331722 
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 *
6 * Copyright (c) 2011 The FreeBSD Foundation
7 * All rights reserved.
8 * Portions of this software were developed by David Chisnall
9 * under sponsorship from the FreeBSD Foundation.
10 * All rights reserved.
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: stable/11/lib/libc/locale/mbsnrtowcs.c 331722 2018-03-29 02:50:57Z eadler $");
36
37#include <errno.h>
38#include <limits.h>
39#include <stdlib.h>
40#include <wchar.h>
41#include "mblocal.h"
42
43size_t
44mbsnrtowcs_l(wchar_t * __restrict dst, const char ** __restrict src,
45    size_t nms, size_t len, mbstate_t * __restrict ps, locale_t locale)
46{
47	FIX_LOCALE(locale);
48	if (ps == NULL)
49		ps = &locale->mbsnrtowcs;
50	return (XLOCALE_CTYPE(locale)->__mbsnrtowcs(dst, src, nms, len, ps));
51}
52size_t
53mbsnrtowcs(wchar_t * __restrict dst, const char ** __restrict src,
54    size_t nms, size_t len, mbstate_t * __restrict ps)
55{
56	return mbsnrtowcs_l(dst, src, nms, len, ps, __get_locale());
57}
58
59size_t
60__mbsnrtowcs_std(wchar_t * __restrict dst, const char ** __restrict src,
61    size_t nms, size_t len, mbstate_t * __restrict ps,
62    mbrtowc_pfn_t pmbrtowc)
63{
64	const char *s;
65	size_t nchr;
66	wchar_t wc;
67	size_t nb;
68
69	s = *src;
70	nchr = 0;
71
72	if (dst == NULL) {
73		for (;;) {
74			if ((nb = pmbrtowc(&wc, s, nms, ps)) == (size_t)-1)
75				/* Invalid sequence - mbrtowc() sets errno. */
76				return ((size_t)-1);
77			else if (nb == 0 || nb == (size_t)-2)
78				return (nchr);
79			s += nb;
80			nms -= nb;
81			nchr++;
82		}
83		/*NOTREACHED*/
84	}
85
86	while (len-- > 0) {
87		if ((nb = pmbrtowc(dst, s, nms, ps)) == (size_t)-1) {
88			*src = s;
89			return ((size_t)-1);
90		} else if (nb == (size_t)-2) {
91			*src = s + nms;
92			return (nchr);
93		} else if (nb == 0) {
94			*src = NULL;
95			return (nchr);
96		}
97		s += nb;
98		nms -= nb;
99		nchr++;
100		dst++;
101	}
102	*src = s;
103	return (nchr);
104}
105