gbk.c revision 128081 
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#include <sys/param.h>
39__FBSDID("$FreeBSD: head/lib/libc/locale/gbk.c 128081 2004-04-10 00:27:52Z tjr $");
40
41#include <runetype.h>
42#include <stdlib.h>
43#include <string.h>
44#include <wchar.h>
45
46extern size_t (*__mbrtowc)(wchar_t * __restrict, const char * __restrict,
47    size_t, mbstate_t * __restrict);
48extern int (*__mbsinit)(const mbstate_t *);
49extern size_t (*__wcrtomb)(char * __restrict, wchar_t, mbstate_t * __restrict);
50
51int	_GBK_init(_RuneLocale *);
52size_t	_GBK_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t,
53	    mbstate_t * __restrict);
54int	_GBK_mbsinit(const mbstate_t *);
55size_t	_GBK_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict);
56
57typedef struct {
58	int	count;
59	u_char	bytes[2];
60} _GBKState;
61
62int
63_GBK_init(_RuneLocale *rl)
64{
65
66	__mbrtowc = _GBK_mbrtowc;
67	__wcrtomb = _GBK_wcrtomb;
68	__mbsinit = _GBK_mbsinit;
69	_CurrentRuneLocale = rl;
70	__mb_cur_max = 2;
71	return (0);
72}
73
74int
75_GBK_mbsinit(const mbstate_t *ps)
76{
77
78	return (ps == NULL || ((const _GBKState *)ps)->count == 0);
79}
80
81static __inline int
82_gbk_check(u_int c)
83{
84
85	c &= 0xff;
86	return ((c >= 0x81 && c <= 0xfe) ? 2 : 1);
87}
88
89size_t
90_GBK_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
91    mbstate_t * __restrict ps)
92{
93	_GBKState *gs;
94	wchar_t wc;
95	int i, len, ocount;
96        size_t ncopy;
97
98	gs = (_GBKState *)ps;
99
100	if (s == NULL) {
101		s = "";
102		n = 1;
103		pwc = NULL;
104	}
105
106	ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(gs->bytes) - gs->count);
107	memcpy(gs->bytes + gs->count, s, ncopy);
108	ocount = gs->count;
109	gs->count += ncopy;
110	s = (char *)gs->bytes;
111	n = gs->count;
112
113	if (n == 0 || (size_t)(len = _gbk_check(*s)) > n)
114		/* Incomplete multibyte sequence */
115		return ((size_t)-2);
116	wc = 0;
117	i = len;
118	while (i-- > 0)
119		wc = (wc << 8) | (unsigned char)*s++;
120	if (pwc != NULL)
121		*pwc = wc;
122	gs->count = 0;
123	return (wc == L'\0' ? 0 : len - ocount);
124}
125
126size_t
127_GBK_wcrtomb(char * __restrict s, wchar_t wc,
128    mbstate_t * __restrict ps __unused)
129{
130
131	if (s == NULL)
132		/* Reset to initial shift state (no-op) */
133		return (1);
134	if (wc & 0x8000) {
135		*s++ = (wc >> 8) & 0xff;
136		*s = wc & 0xff;
137		return (2);
138	}
139	*s = wc & 0xff;
140	return (1);
141}
142