xref: /freebsd/lib/libc/locale/mbsnrtowcs.c (revision 0dbdecfd4f23486da21345fe446a28a1c27db3f2)
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 
45 size_t
46 mbsnrtowcs_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 }
54 size_t
55 mbsnrtowcs(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 
61 size_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