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. All rights reserved.
5 * Copyright (c) 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Paul Borman at Krystal Technologies.
10 *
11 * Copyright (c) 2011 The FreeBSD Foundation
12 * All rights reserved.
13 * Portions of this software were developed by David Chisnall
14 * under sponsorship from the FreeBSD Foundation.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 *    notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 *    notice, this list of conditions and the following disclaimer in the
23 *    documentation and/or other materials provided with the distribution.
24 * 3. Neither the name of the University nor the names of its contributors
25 *    may be used to endorse or promote products derived from this software
26 *    without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 */
40
41#if defined(LIBC_SCCS) && !defined(lint)
42static char sccsid[] = "@(#)big5.c	8.1 (Berkeley) 6/4/93";
43#endif /* LIBC_SCCS and not lint */
44#include <sys/cdefs.h>
45__FBSDID("$FreeBSD$");
46
47#include <sys/types.h>
48#include <errno.h>
49#include <runetype.h>
50#include <stdlib.h>
51#include <string.h>
52#include <wchar.h>
53#include "mblocal.h"
54
55extern int __mb_sb_limit;
56
57static size_t	_BIG5_mbrtowc(wchar_t * __restrict, const char * __restrict,
58		    size_t, mbstate_t * __restrict);
59static int	_BIG5_mbsinit(const mbstate_t *);
60static size_t	_BIG5_wcrtomb(char * __restrict, wchar_t,
61		    mbstate_t * __restrict);
62static size_t	_BIG5_mbsnrtowcs(wchar_t * __restrict,
63		    const char ** __restrict, size_t, size_t,
64		    mbstate_t * __restrict);
65static size_t	_BIG5_wcsnrtombs(char * __restrict,
66		    const wchar_t ** __restrict, size_t, size_t,
67		    mbstate_t * __restrict);
68
69typedef struct {
70	wchar_t	ch;
71} _BIG5State;
72
73int
74_BIG5_init(struct xlocale_ctype *l, _RuneLocale *rl)
75{
76
77	l->__mbrtowc = _BIG5_mbrtowc;
78	l->__wcrtomb = _BIG5_wcrtomb;
79	l->__mbsnrtowcs = _BIG5_mbsnrtowcs;
80	l->__wcsnrtombs = _BIG5_wcsnrtombs;
81	l->__mbsinit = _BIG5_mbsinit;
82	l->runes = rl;
83	l->__mb_cur_max = 2;
84	l->__mb_sb_limit = 128;
85	return (0);
86}
87
88static int
89_BIG5_mbsinit(const mbstate_t *ps)
90{
91
92	return (ps == NULL || ((const _BIG5State *)ps)->ch == 0);
93}
94
95static __inline int
96_big5_check(u_int c)
97{
98
99	c &= 0xff;
100	return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1);
101}
102
103static size_t
104_BIG5_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
105    mbstate_t * __restrict ps)
106{
107	_BIG5State *bs;
108	wchar_t wc;
109	size_t len;
110
111	bs = (_BIG5State *)ps;
112
113	if ((bs->ch & ~0xFF) != 0) {
114		/* Bad conversion state. */
115		errno = EINVAL;
116		return ((size_t)-1);
117	}
118
119	if (s == NULL) {
120		s = "";
121		n = 1;
122		pwc = NULL;
123	}
124
125	if (n == 0)
126		/* Incomplete multibyte sequence */
127		return ((size_t)-2);
128
129	if (bs->ch != 0) {
130		if (*s == '\0') {
131			errno = EILSEQ;
132			return ((size_t)-1);
133		}
134		wc = (bs->ch << 8) | (*s & 0xFF);
135		if (pwc != NULL)
136			*pwc = wc;
137		bs->ch = 0;
138		return (1);
139	}
140
141	len = (size_t)_big5_check(*s);
142	wc = *s++ & 0xff;
143	if (len == 2) {
144		if (n < 2) {
145			/* Incomplete multibyte sequence */
146			bs->ch = wc;
147			return ((size_t)-2);
148		}
149		if (*s == '\0') {
150			errno = EILSEQ;
151			return ((size_t)-1);
152		}
153		wc = (wc << 8) | (*s++ & 0xff);
154		if (pwc != NULL)
155			*pwc = wc;
156		return (2);
157	} else {
158		if (pwc != NULL)
159			*pwc = wc;
160		return (wc == L'\0' ? 0 : 1);
161	}
162}
163
164static size_t
165_BIG5_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps)
166{
167	_BIG5State *bs;
168
169	bs = (_BIG5State *)ps;
170
171	if (bs->ch != 0) {
172		errno = EINVAL;
173		return ((size_t)-1);
174	}
175
176	if (s == NULL)
177		/* Reset to initial shift state (no-op) */
178		return (1);
179	if (wc & 0x8000) {
180		*s++ = (wc >> 8) & 0xff;
181		*s = wc & 0xff;
182		return (2);
183	}
184	*s = wc & 0xff;
185	return (1);
186}
187
188static size_t
189_BIG5_mbsnrtowcs(wchar_t * __restrict dst, const char ** __restrict src,
190    size_t nms, size_t len, mbstate_t * __restrict ps)
191{
192	return (__mbsnrtowcs_std(dst, src, nms, len, ps, _BIG5_mbrtowc));
193}
194
195static size_t
196_BIG5_wcsnrtombs(char * __restrict dst, const wchar_t ** __restrict src,
197    size_t nwc, size_t len, mbstate_t * __restrict ps)
198{
199	return (__wcsnrtombs_std(dst, src, nwc, len, ps, _BIG5_wcrtomb));
200}
201