big5.c revision 122283 
1/*-
2 * Copyright (c) 2002, 2003 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: head/lib/libc/locale/big5.c 122283 2003-11-08 02:58:37Z tjr $");
43
44#include <sys/types.h>
45#include <runetype.h>
46#include <stdlib.h>
47#include <wchar.h>
48
49extern size_t (*__mbrtowc)(wchar_t * __restrict, const char * __restrict,
50    size_t, mbstate_t * __restrict);
51extern size_t (*__wcrtomb)(char * __restrict, wchar_t, mbstate_t * __restrict);
52
53int	_BIG5_init(_RuneLocale *);
54size_t	_BIG5_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t,
55	    mbstate_t * __restrict);
56size_t	_BIG5_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict);
57
58int
59_BIG5_init(_RuneLocale *rl)
60{
61
62	__mbrtowc = _BIG5_mbrtowc;
63	__wcrtomb = _BIG5_wcrtomb;
64	_CurrentRuneLocale = rl;
65	__mb_cur_max = 2;
66	return (0);
67}
68
69static __inline int
70_big5_check(u_int c)
71{
72
73	c &= 0xff;
74	return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1);
75}
76
77size_t
78_BIG5_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
79    mbstate_t * __restrict ps __unused)
80{
81	wchar_t wc;
82	int i, len;
83
84	if (s == NULL)
85		/* Reset to initial shift state (no-op) */
86		return (0);
87	if (n == 0 || (size_t)(len = _big5_check(*s)) > n)
88		/* Incomplete multibyte sequence */
89		return ((size_t)-2);
90	wc = 0;
91	i = len;
92	while (i-- > 0)
93		wc = (wc << 8) | (unsigned char)*s++;
94	if (pwc != NULL)
95		*pwc = wc;
96	return (wc == L'\0' ? 0 : len);
97}
98
99size_t
100_BIG5_wcrtomb(char * __restrict s, wchar_t wc,
101    mbstate_t * __restrict ps __unused)
102{
103
104	if (s == NULL)
105		/* Reset to initial shift state (no-op) */
106		return (1);
107	if (wc & 0x8000) {
108		*s++ = (wc >> 8) & 0xff;
109		*s = wc & 0xff;
110		return (2);
111	}
112	*s = wc & 0xff;
113	return (1);
114}
115