gbk.c revision 123665 
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#include <sys/cdefs.h>
39__FBSDID("$FreeBSD: head/lib/libc/locale/gbk.c 123665 2003-12-19 12:54:42Z ache $");
40
41#include <sys/types.h>
42#include <runetype.h>
43#include <stdlib.h>
44#include <wchar.h>
45
46extern size_t (*__mbrtowc)(wchar_t * __restrict, const char * __restrict,
47    size_t, mbstate_t * __restrict);
48extern size_t (*__wcrtomb)(char * __restrict, wchar_t, mbstate_t * __restrict);
49
50int	_GBK_init(_RuneLocale *);
51size_t	_GBK_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t,
52	    mbstate_t * __restrict);
53size_t	_GBK_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict);
54
55int
56_GBK_init(_RuneLocale *rl)
57{
58
59	__mbrtowc = _GBK_mbrtowc;
60	__wcrtomb = _GBK_wcrtomb;
61	_CurrentRuneLocale = rl;
62	__mb_cur_max = 2;
63	return (0);
64}
65
66static __inline int
67_gbk_check(u_int c)
68{
69
70	c &= 0xff;
71	return ((c >= 0x81 && c <= 0xfe) ? 2 : 1);
72}
73
74size_t
75_GBK_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
76    mbstate_t * __restrict ps __unused)
77{
78	wchar_t wc;
79	int i, len;
80
81	if (s == NULL)
82		/* Reset to initial shift state (no-op) */
83		return (0);
84	if (n == 0 || (size_t)(len = _gbk_check(*s)) > n)
85		/* Incomplete multibyte sequence */
86		return ((size_t)-2);
87	wc = 0;
88	i = len;
89	while (i-- > 0)
90		wc = (wc << 8) | (unsigned char)*s++;
91	if (pwc != NULL)
92		*pwc = wc;
93	return (wc == L'\0' ? 0 : len);
94}
95
96size_t
97_GBK_wcrtomb(char * __restrict s, wchar_t wc,
98    mbstate_t * __restrict ps __unused)
99{
100
101	if (s == NULL)
102		/* Reset to initial shift state (no-op) */
103		return (1);
104	if (wc & 0x8000) {
105		*s++ = (wc >> 8) & 0xff;
106		*s = wc & 0xff;
107		return (2);
108	}
109	*s = wc & 0xff;
110	return (1);
111}
112