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 * Copyright (c) 2011 The FreeBSD Foundation
10 * All rights reserved.
11 * Portions of this software were developed by David Chisnall
12 * under sponsorship from the FreeBSD Foundation.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 *    notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 *    notice, this list of conditions and the following disclaimer in the
21 *    documentation and/or other materials provided with the distribution.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD$");
41
42#include <sys/types.h>
43#include <errno.h>
44#include <runetype.h>
45#include <stdlib.h>
46#include <string.h>
47#include <wchar.h>
48#include "mblocal.h"
49
50extern int __mb_sb_limit;
51
52static size_t	_GBK_mbrtowc(wchar_t * __restrict, const char * __restrict,
53		    size_t, mbstate_t * __restrict);
54static int	_GBK_mbsinit(const mbstate_t *);
55static size_t	_GBK_wcrtomb(char * __restrict, wchar_t,
56		    mbstate_t * __restrict);
57
58typedef struct {
59	wchar_t	ch;
60} _GBKState;
61
62int
63_GBK_init(struct xlocale_ctype *l, _RuneLocale *rl)
64{
65
66	l->__mbrtowc = _GBK_mbrtowc;
67	l->__wcrtomb = _GBK_wcrtomb;
68	l->__mbsinit = _GBK_mbsinit;
69	l->runes = rl;
70	l->__mb_cur_max = 2;
71	l->__mb_sb_limit = 128;
72	return (0);
73}
74
75static int
76_GBK_mbsinit(const mbstate_t *ps)
77{
78
79	return (ps == NULL || ((const _GBKState *)ps)->ch == 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
90static size_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	size_t len;
97
98	gs = (_GBKState *)ps;
99
100	if ((gs->ch & ~0xFF) != 0) {
101		/* Bad conversion state. */
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	if (n == 0)
113		/* Incomplete multibyte sequence */
114		return ((size_t)-2);
115
116	if (gs->ch != 0) {
117		if (*s == '\0') {
118			errno = EILSEQ;
119			return ((size_t)-1);
120		}
121		wc = (gs->ch << 8) | (*s & 0xFF);
122		if (pwc != NULL)
123			*pwc = wc;
124		gs->ch = 0;
125		return (1);
126	}
127
128	len = (size_t)_gbk_check(*s);
129	wc = *s++ & 0xff;
130	if (len == 2) {
131		if (n < 2) {
132			/* Incomplete multibyte sequence */
133			gs->ch = wc;
134			return ((size_t)-2);
135		}
136		if (*s == '\0') {
137			errno = EILSEQ;
138			return ((size_t)-1);
139		}
140		wc = (wc << 8) | (*s++ & 0xff);
141		if (pwc != NULL)
142			*pwc = wc;
143                return (2);
144	} else {
145		if (pwc != NULL)
146			*pwc = wc;
147		return (wc == L'\0' ? 0 : 1);
148	}
149}
150
151static size_t
152_GBK_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps)
153{
154	_GBKState *gs;
155
156	gs = (_GBKState *)ps;
157
158	if (gs->ch != 0) {
159		errno = EINVAL;
160		return ((size_t)-1);
161	}
162
163	if (s == NULL)
164		/* Reset to initial shift state (no-op) */
165		return (1);
166	if (wc & 0x8000) {
167		*s++ = (wc >> 8) & 0xff;
168		*s = wc & 0xff;
169		return (2);
170	}
171	*s = wc & 0xff;
172	return (1);
173}
174