1/*-
2 * Copyright (c) 2002-2004 Tim J. Robbins.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: src/lib/libc/locale/wcsnrtombs.c,v 1.3 2005/02/12 08:45:12 stefanf Exp $");
29
30#include "xlocale_private.h"
31
32#include <limits.h>
33#include <stdlib.h>
34#include <string.h>
35#include <wchar.h>
36#include "mblocal.h"
37
38size_t
39wcsnrtombs_l(char * __restrict dst, const wchar_t ** __restrict src, size_t nwc,
40    size_t len, mbstate_t * __restrict ps, locale_t loc)
41{
42	NORMALIZE_LOCALE(loc);
43	if (ps == NULL)
44		ps = &loc->__mbs_wcsnrtombs;
45	return (loc->__lc_ctype->__wcsnrtombs(dst, src, nwc, len, ps, loc));
46}
47
48size_t
49wcsnrtombs(char * __restrict dst, const wchar_t ** __restrict src, size_t nwc,
50    size_t len, mbstate_t * __restrict ps)
51{
52	return wcsnrtombs_l(dst, src, nwc, len, ps, __current_locale());
53}
54
55__private_extern__ size_t
56__wcsnrtombs_std(char * __restrict dst, const wchar_t ** __restrict src,
57    size_t nwc, size_t len, mbstate_t * __restrict ps, locale_t loc)
58{
59	mbstate_t mbsbak;
60	char buf[MB_LEN_MAX];
61	const wchar_t *s;
62	size_t nbytes;
63	size_t nb;
64	struct __xlocale_st_runelocale *runeLocale = loc->__lc_ctype;
65	size_t (*__wcrtomb)(char * __restrict, wchar_t, mbstate_t * __restrict, locale_t) = runeLocale->__wcrtomb;
66	int mb_cur_max = runeLocale->__mb_cur_max;
67
68	s = *src;
69	nbytes = 0;
70
71	if (dst == NULL) {
72		while (nwc-- > 0) {
73			if ((nb = __wcrtomb(buf, *s, ps, loc)) == (size_t)-1)
74				/* Invalid character - wcrtomb() sets errno. */
75				return ((size_t)-1);
76			else if (*s == L'\0')
77				return (nbytes + nb - 1);
78			s++;
79			nbytes += nb;
80		}
81		return (nbytes);
82	}
83
84	while (len > 0 && nwc-- > 0) {
85		if (len > (size_t)mb_cur_max) {
86			/* Enough space to translate in-place. */
87			if ((nb = __wcrtomb(dst, *s, ps, loc)) == (size_t)-1) {
88				*src = s;
89				return ((size_t)-1);
90			}
91		} else {
92			/*
93			 * May not be enough space; use temp. buffer.
94			 *
95			 * We need to save a copy of the conversion state
96			 * here so we can restore it if the multibyte
97			 * character is too long for the buffer.
98			 */
99			mbsbak = *ps;
100			if ((nb = __wcrtomb(buf, *s, ps, loc)) == (size_t)-1) {
101				*src = s;
102				return ((size_t)-1);
103			}
104			if (nb > (int)len) {
105				/* MB sequence for character won't fit. */
106				*ps = mbsbak;
107				break;
108			}
109			memcpy(dst, buf, nb);
110		}
111		if (*s == L'\0') {
112			*src = NULL;
113			return (nbytes + nb - 1);
114		}
115		s++;
116		dst += nb;
117		len -= nb;
118		nbytes += nb;
119	}
120	*src = s;
121	return (nbytes);
122}
123