gbk.c revision 172619 
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 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: head/lib/libc/locale/gbk.c 172619 2007-10-13 16:28:22Z ache $");
36
37#include <sys/types.h>
38#include <errno.h>
39#include <runetype.h>
40#include <stdlib.h>
41#include <string.h>
42#include <wchar.h>
43#include "mblocal.h"
44
45extern int __mb_sb_limit;
46
47static size_t	_GBK_mbrtowc(wchar_t * __restrict, const char * __restrict,
48		    size_t, mbstate_t * __restrict);
49static int	_GBK_mbsinit(const mbstate_t *);
50static size_t	_GBK_wcrtomb(char * __restrict, wchar_t,
51		    mbstate_t * __restrict);
52
53typedef struct {
54	wchar_t	ch;
55} _GBKState;
56
57int
58_GBK_init(_RuneLocale *rl)
59{
60
61	__mbrtowc = _GBK_mbrtowc;
62	__wcrtomb = _GBK_wcrtomb;
63	__mbsinit = _GBK_mbsinit;
64	_CurrentRuneLocale = rl;
65	__mb_cur_max = 2;
66	__mb_sb_limit = 128;
67	return (0);
68}
69
70static int
71_GBK_mbsinit(const mbstate_t *ps)
72{
73
74	return (ps == NULL || ((const _GBKState *)ps)->ch == 0);
75}
76
77static __inline int
78_gbk_check(u_int c)
79{
80
81	c &= 0xff;
82	return ((c >= 0x81 && c <= 0xfe) ? 2 : 1);
83}
84
85static size_t
86_GBK_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
87    mbstate_t * __restrict ps)
88{
89	_GBKState *gs;
90	wchar_t wc;
91	size_t len;
92
93	gs = (_GBKState *)ps;
94
95	if ((gs->ch & ~0xFF) != 0) {
96		/* Bad conversion state. */
97		errno = EINVAL;
98		return ((size_t)-1);
99	}
100
101	if (s == NULL) {
102		s = "";
103		n = 1;
104		pwc = NULL;
105	}
106
107	if (n == 0)
108		/* Incomplete multibyte sequence */
109		return ((size_t)-2);
110
111	if (gs->ch != 0) {
112		if (*s == '\0') {
113			errno = EILSEQ;
114			return ((size_t)-1);
115		}
116		wc = (gs->ch << 8) | (*s & 0xFF);
117		if (pwc != NULL)
118			*pwc = wc;
119		gs->ch = 0;
120		return (1);
121	}
122
123	len = (size_t)_gbk_check(*s);
124	wc = *s++ & 0xff;
125	if (len == 2) {
126		if (n < 2) {
127			/* Incomplete multibyte sequence */
128			gs->ch = wc;
129			return ((size_t)-2);
130		}
131		if (*s == '\0') {
132			errno = EILSEQ;
133			return ((size_t)-1);
134		}
135		wc = (wc << 8) | (*s++ & 0xff);
136		if (pwc != NULL)
137			*pwc = wc;
138                return (2);
139	} else {
140		if (pwc != NULL)
141			*pwc = wc;
142		return (wc == L'\0' ? 0 : 1);
143	}
144}
145
146static size_t
147_GBK_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps)
148{
149	_GBKState *gs;
150
151	gs = (_GBKState *)ps;
152
153	if (gs->ch != 0) {
154		errno = EINVAL;
155		return ((size_t)-1);
156	}
157
158	if (s == NULL)
159		/* Reset to initial shift state (no-op) */
160		return (1);
161	if (wc & 0x8000) {
162		*s++ = (wc >> 8) & 0xff;
163		*s = wc & 0xff;
164		return (2);
165	}
166	*s = wc & 0xff;
167	return (1);
168}
169