1/*-
2 * Copyright (c) 2002-2004 Tim J. Robbins. All rights reserved.
3 * Copyright (c) 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Paul Borman at Krystal Technologies.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *	This product includes software developed by the University of
20 *	California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38#if defined(LIBC_SCCS) && !defined(lint)
39static char sccsid[] = "@(#)big5.c	8.1 (Berkeley) 6/4/93";
40#endif /* LIBC_SCCS and not lint */
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: src/lib/libc/locale/big5.c,v 1.18 2007/10/13 16:28:21 ache Exp $");
43
44#include "xlocale_private.h"
45
46#include <sys/types.h>
47#include <errno.h>
48#include <runetype.h>
49#include <stdlib.h>
50#include <string.h>
51#include <wchar.h>
52#include "mblocal.h"
53
54static size_t	_BIG5_mbrtowc(wchar_t * __restrict, const char * __restrict,
55		    size_t, mbstate_t * __restrict, locale_t);
56static int	_BIG5_mbsinit(const mbstate_t *, locale_t);
57static size_t	_BIG5_wcrtomb(char * __restrict, wchar_t,
58		    mbstate_t * __restrict, locale_t);
59
60typedef struct {
61	wchar_t	ch;
62} _BIG5State;
63
64int
65_BIG5_init(struct __xlocale_st_runelocale *xrl)
66{
67
68	xrl->__mbrtowc = _BIG5_mbrtowc;
69	xrl->__wcrtomb = _BIG5_wcrtomb;
70	xrl->__mbsinit = _BIG5_mbsinit;
71	xrl->__mb_cur_max = 2;
72	xrl->__mb_sb_limit = 128;
73	return (0);
74}
75
76static int
77_BIG5_mbsinit(const mbstate_t *ps, locale_t loc __unused)
78{
79
80	return (ps == NULL || ((const _BIG5State *)ps)->ch == 0);
81}
82
83static __inline int
84_big5_check(u_int c)
85{
86
87	c &= 0xff;
88	return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1);
89}
90
91static size_t
92_BIG5_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
93    mbstate_t * __restrict ps, locale_t loc __unused)
94{
95	_BIG5State *bs;
96	wchar_t wc;
97	size_t len;
98
99	bs = (_BIG5State *)ps;
100
101	if ((bs->ch & ~0xFF) != 0) {
102		/* Bad conversion state. */
103		errno = EINVAL;
104		return ((size_t)-1);
105	}
106
107	if (s == NULL) {
108		s = "";
109		n = 1;
110		pwc = NULL;
111	}
112
113	if (n == 0)
114		/* Incomplete multibyte sequence */
115		return ((size_t)-2);
116
117	if (bs->ch != 0) {
118		if (*s == '\0') {
119			errno = EILSEQ;
120			return ((size_t)-1);
121		}
122		wc = (bs->ch << 8) | (*s & 0xFF);
123		if (pwc != NULL)
124			*pwc = wc;
125		bs->ch = 0;
126		return (1);
127	}
128
129	len = (size_t)_big5_check(*s);
130	wc = *s++ & 0xff;
131	if (len == 2) {
132		if (n < 2) {
133			/* Incomplete multibyte sequence */
134			bs->ch = wc;
135			return ((size_t)-2);
136		}
137		if (*s == '\0') {
138			errno = EILSEQ;
139			return ((size_t)-1);
140		}
141		wc = (wc << 8) | (*s++ & 0xff);
142		if (pwc != NULL)
143			*pwc = wc;
144                return (2);
145	} else {
146		if (pwc != NULL)
147			*pwc = wc;
148		return (wc == L'\0' ? 0 : 1);
149	}
150}
151
152static size_t
153_BIG5_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps, locale_t loc __unused)
154{
155	_BIG5State *bs;
156
157	bs = (_BIG5State *)ps;
158
159	if (bs->ch != 0) {
160		errno = EINVAL;
161		return ((size_t)-1);
162	}
163
164	if (s == NULL)
165		/* Reset to initial shift state (no-op) */
166		return (1);
167	if (wc & 0x8000) {
168		*s++ = (wc >> 8) & 0xff;
169		*s = wc & 0xff;
170		return (2);
171	}
172	*s = wc & 0xff;
173	return (1);
174}
175