gbk.c revision 129153 
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 129153 2004-05-12 14:09:04Z tjr $");
40
41#include <errno.h>
42#include <runetype.h>
43#include <stdlib.h>
44#include <string.h>
45#include <wchar.h>
46#include "mblocal.h"
47
48int	_GBK_init(_RuneLocale *);
49size_t	_GBK_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t,
50	    mbstate_t * __restrict);
51int	_GBK_mbsinit(const mbstate_t *);
52size_t	_GBK_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict);
53
54typedef struct {
55	int	count;
56	u_char	bytes[2];
57} _GBKState;
58
59int
60_GBK_init(_RuneLocale *rl)
61{
62
63	__mbrtowc = _GBK_mbrtowc;
64	__wcrtomb = _GBK_wcrtomb;
65	__mbsinit = _GBK_mbsinit;
66	_CurrentRuneLocale = rl;
67	__mb_cur_max = 2;
68	return (0);
69}
70
71int
72_GBK_mbsinit(const mbstate_t *ps)
73{
74
75	return (ps == NULL || ((const _GBKState *)ps)->count == 0);
76}
77
78static __inline int
79_gbk_check(u_int c)
80{
81
82	c &= 0xff;
83	return ((c >= 0x81 && c <= 0xfe) ? 2 : 1);
84}
85
86size_t
87_GBK_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
88    mbstate_t * __restrict ps)
89{
90	_GBKState *gs;
91	wchar_t wc;
92	int i, len, ocount;
93        size_t ncopy;
94
95	gs = (_GBKState *)ps;
96
97	if (gs->count < 0 || gs->count > sizeof(gs->bytes)) {
98		errno = EINVAL;
99		return ((size_t)-1);
100	}
101
102	if (s == NULL) {
103		s = "";
104		n = 1;
105		pwc = NULL;
106	}
107
108	ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(gs->bytes) - gs->count);
109	memcpy(gs->bytes + gs->count, s, ncopy);
110	ocount = gs->count;
111	gs->count += ncopy;
112	s = (char *)gs->bytes;
113	n = gs->count;
114
115	if (n == 0 || (size_t)(len = _gbk_check(*s)) > n)
116		/* Incomplete multibyte sequence */
117		return ((size_t)-2);
118	if (n == 2 && s[1] == '\0') {
119		errno = EILSEQ;
120		return ((size_t)-1);
121	}
122	wc = 0;
123	i = len;
124	while (i-- > 0)
125		wc = (wc << 8) | (unsigned char)*s++;
126	if (pwc != NULL)
127		*pwc = wc;
128	gs->count = 0;
129	return (wc == L'\0' ? 0 : len - ocount);
130}
131
132size_t
133_GBK_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps)
134{
135	_GBKState *gs;
136
137	gs = (_GBKState *)ps;
138
139	if (gs->count != 0) {
140		errno = EINVAL;
141		return ((size_t)-1);
142	}
143
144	if (s == NULL)
145		/* Reset to initial shift state (no-op) */
146		return (1);
147	if (wc & 0x8000) {
148		*s++ = (wc >> 8) & 0xff;
149		*s = wc & 0xff;
150		return (2);
151	}
152	*s = wc & 0xff;
153	return (1);
154}
155