xref: /freebsd/lib/libc/locale/mbsnrtowcs.c (revision 7661de35d15f582ab33e3bd6b8d909601557e436)
1 /*-
2  * Copyright (c) 2002-2004 Tim J. Robbins.
3  *
4  * Copyright (c) 2011 The FreeBSD Foundation
5  * All rights reserved.
6  * Portions of this software were developed by David Chisnall
7  * under sponsorship from the FreeBSD Foundation.
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  */
31 
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34 
35 #include <errno.h>
36 #include <limits.h>
37 #include <stdlib.h>
38 #include <wchar.h>
39 #include "mblocal.h"
40 
41 size_t
42 mbsnrtowcs_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 = &locale->mbsnrtowcs;
48 	return (XLOCALE_CTYPE(locale)->__mbsnrtowcs(dst, src, nms, len, ps));
49 }
50 size_t
51 mbsnrtowcs(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 
57 size_t
58 __mbsnrtowcs_std(wchar_t * __restrict dst, const char ** __restrict src,
59     size_t nms, size_t len, mbstate_t * __restrict ps)
60 {
61 	const char *s;
62 	size_t nchr;
63 	wchar_t wc;
64 	size_t nb;
65 	struct xlocale_ctype *ct = XLOCALE_CTYPE(__get_locale());
66 
67 	s = *src;
68 	nchr = 0;
69 
70 	if (dst == NULL) {
71 		for (;;) {
72 			if ((nb = ct->__mbrtowc(&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 = ct->__mbrtowc(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