gbk.c revision 142654 
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/cdefs.h>
39__FBSDID("$FreeBSD: head/lib/libc/locale/gbk.c 142654 2005-02-27 15:11:09Z phantom $");
40
41#include <sys/types.h>
42#include <errno.h>
43#include <runetype.h>
44#include <stdlib.h>
45#include <string.h>
46#include <wchar.h>
47#include "mblocal.h"
48
49static size_t	_GBK_mbrtowc(wchar_t * __restrict, const char * __restrict,
50		    size_t, mbstate_t * __restrict);
51static int	_GBK_mbsinit(const mbstate_t *);
52static size_t	_GBK_wcrtomb(char * __restrict, wchar_t,
53		    mbstate_t * __restrict);
54
55typedef struct {
56	wchar_t	ch;
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
71static int
72_GBK_mbsinit(const mbstate_t *ps)
73{
74
75	return (ps == NULL || ((const _GBKState *)ps)->ch == 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
86static size_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	size_t len;
93
94	gs = (_GBKState *)ps;
95
96	if ((gs->ch & ~0xFF) != 0) {
97		/* Bad conversion state. */
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	if (n == 0)
109		/* Incomplete multibyte sequence */
110		return ((size_t)-2);
111
112	if (gs->ch != 0) {
113		if (*s == '\0') {
114			errno = EILSEQ;
115			return ((size_t)-1);
116		}
117		wc = (gs->ch << 8) | (*s & 0xFF);
118		if (pwc != NULL)
119			*pwc = wc;
120		gs->ch = 0;
121		return (1);
122	}
123
124	len = (size_t)_gbk_check(*s);
125	wc = *s++ & 0xff;
126	if (len == 2) {
127		if (n < 2) {
128			/* Incomplete multibyte sequence */
129			gs->ch = wc;
130			return ((size_t)-2);
131		}
132		if (*s == '\0') {
133			errno = EILSEQ;
134			return ((size_t)-1);
135		}
136		wc = (wc << 8) | (*s++ & 0xff);
137		if (pwc != NULL)
138			*pwc = wc;
139                return (2);
140	} else {
141		if (pwc != NULL)
142			*pwc = wc;
143		return (wc == L'\0' ? 0 : 1);
144	}
145}
146
147static size_t
148_GBK_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps)
149{
150	_GBKState *gs;
151
152	gs = (_GBKState *)ps;
153
154	if (gs->ch != 0) {
155		errno = EINVAL;
156		return ((size_t)-1);
157	}
158
159	if (s == NULL)
160		/* Reset to initial shift state (no-op) */
161		return (1);
162	if (wc & 0x8000) {
163		*s++ = (wc >> 8) & 0xff;
164		*s = wc & 0xff;
165		return (2);
166	}
167	*s = wc & 0xff;
168	return (1);
169}
170