gbk.c revision 129117 
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 129117 2004-05-11 14:08:22Z tjr $");
40
41#include <errno.h>
42#include <runetype.h>
43#include <stdlib.h>
44#include <string.h>
45#include <wchar.h>
46
47extern size_t (*__mbrtowc)(wchar_t * __restrict, const char * __restrict,
48    size_t, mbstate_t * __restrict);
49extern int (*__mbsinit)(const mbstate_t *);
50extern size_t (*__wcrtomb)(char * __restrict, wchar_t, mbstate_t * __restrict);
51
52int	_GBK_init(_RuneLocale *);
53size_t	_GBK_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t,
54	    mbstate_t * __restrict);
55int	_GBK_mbsinit(const mbstate_t *);
56size_t	_GBK_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict);
57
58typedef struct {
59	int	count;
60	u_char	bytes[2];
61} _GBKState;
62
63int
64_GBK_init(_RuneLocale *rl)
65{
66
67	__mbrtowc = _GBK_mbrtowc;
68	__wcrtomb = _GBK_wcrtomb;
69	__mbsinit = _GBK_mbsinit;
70	_CurrentRuneLocale = rl;
71	__mb_cur_max = 2;
72	return (0);
73}
74
75int
76_GBK_mbsinit(const mbstate_t *ps)
77{
78
79	return (ps == NULL || ((const _GBKState *)ps)->count == 0);
80}
81
82static __inline int
83_gbk_check(u_int c)
84{
85
86	c &= 0xff;
87	return ((c >= 0x81 && c <= 0xfe) ? 2 : 1);
88}
89
90size_t
91_GBK_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
92    mbstate_t * __restrict ps)
93{
94	_GBKState *gs;
95	wchar_t wc;
96	int i, len, ocount;
97        size_t ncopy;
98
99	gs = (_GBKState *)ps;
100
101	if (gs->count < 0 || gs->count > sizeof(gs->bytes)) {
102		errno = EINVAL;
103		return ((size_t)-1);
104	}
105
106	if (s == NULL) {
107		s = "";
108		n = 1;
109		pwc = NULL;
110	}
111
112	ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(gs->bytes) - gs->count);
113	memcpy(gs->bytes + gs->count, s, ncopy);
114	ocount = gs->count;
115	gs->count += ncopy;
116	s = (char *)gs->bytes;
117	n = gs->count;
118
119	if (n == 0 || (size_t)(len = _gbk_check(*s)) > n)
120		/* Incomplete multibyte sequence */
121		return ((size_t)-2);
122	if (n == 2 && s[1] == '\0') {
123		errno = EILSEQ;
124		return ((size_t)-1);
125	}
126	wc = 0;
127	i = len;
128	while (i-- > 0)
129		wc = (wc << 8) | (unsigned char)*s++;
130	if (pwc != NULL)
131		*pwc = wc;
132	gs->count = 0;
133	return (wc == L'\0' ? 0 : len - ocount);
134}
135
136size_t
137_GBK_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps)
138{
139	_GBKState *gs;
140
141	gs = (_GBKState *)ps;
142
143	if (gs->count != 0) {
144		errno = EINVAL;
145		return ((size_t)-1);
146	}
147
148	if (s == NULL)
149		/* Reset to initial shift state (no-op) */
150		return (1);
151	if (wc & 0x8000) {
152		*s++ = (wc >> 8) & 0xff;
153		*s = wc & 0xff;
154		return (2);
155	}
156	*s = wc & 0xff;
157	return (1);
158}
159