1/*-
2 * Copyright 2013 Garrett D'Amore <garrett@damore.org>
3 * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
4 * Copyright (c) 2004 Tim J. Robbins. All rights reserved.
5 * Copyright (c) 2003 David Xu <davidxu@freebsd.org>
6 * All rights reserved.
7 *
8 * Copyright (c) 2011 The FreeBSD Foundation
9 * All rights reserved.
10 * Portions of this software were developed by David Chisnall
11 * under sponsorship from the FreeBSD Foundation.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/param.h>
36__FBSDID("$FreeBSD$");
37
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
45static size_t	_GB2312_mbrtowc(wchar_t * __restrict, const char * __restrict,
46		    size_t, mbstate_t * __restrict);
47static int	_GB2312_mbsinit(const mbstate_t *);
48static size_t	_GB2312_wcrtomb(char * __restrict, wchar_t,
49		    mbstate_t * __restrict);
50static size_t	_GB2312_mbsnrtowcs(wchar_t * __restrict,
51		    const char ** __restrict, size_t, size_t,
52		    mbstate_t * __restrict);
53static size_t	_GB2312_wcsnrtombs(char * __restrict,
54		    const wchar_t ** __restrict, size_t, size_t,
55		    mbstate_t * __restrict);
56
57
58typedef struct {
59	int	count;
60	u_char	bytes[2];
61} _GB2312State;
62
63int
64_GB2312_init(struct xlocale_ctype *l, _RuneLocale *rl)
65{
66
67	l->runes = rl;
68	l->__mbrtowc = _GB2312_mbrtowc;
69	l->__wcrtomb = _GB2312_wcrtomb;
70	l->__mbsinit = _GB2312_mbsinit;
71	l->__mbsnrtowcs = _GB2312_mbsnrtowcs;
72	l->__wcsnrtombs = _GB2312_wcsnrtombs;
73	l->__mb_cur_max = 2;
74	l->__mb_sb_limit = 128;
75	return (0);
76}
77
78static int
79_GB2312_mbsinit(const mbstate_t *ps)
80{
81
82	return (ps == NULL || ((const _GB2312State *)ps)->count == 0);
83}
84
85static int
86_GB2312_check(const char *str, size_t n)
87{
88	const u_char *s = (const u_char *)str;
89
90	if (n == 0)
91		/* Incomplete multibyte sequence */
92		return (-2);
93	if (s[0] >= 0xa1 && s[0] <= 0xfe) {
94		if (n < 2)
95			/* Incomplete multibyte sequence */
96			return (-2);
97		if (s[1] < 0xa1 || s[1] > 0xfe)
98			/* Invalid multibyte sequence */
99			return (-1);
100		return (2);
101	} else if (s[0] & 0x80) {
102		/* Invalid multibyte sequence */
103		return (-1);
104	}
105	return (1);
106}
107
108static size_t
109_GB2312_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
110    mbstate_t * __restrict ps)
111{
112	_GB2312State *gs;
113	wchar_t wc;
114	int i, len, ocount;
115	size_t ncopy;
116
117	gs = (_GB2312State *)ps;
118
119	if (gs->count < 0 || gs->count > sizeof(gs->bytes)) {
120		errno = EINVAL;
121		return ((size_t)-1);
122	}
123
124	if (s == NULL) {
125		s = "";
126		n = 1;
127		pwc = NULL;
128	}
129
130	ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(gs->bytes) - gs->count);
131	memcpy(gs->bytes + gs->count, s, ncopy);
132	ocount = gs->count;
133	gs->count += ncopy;
134	s = (char *)gs->bytes;
135	n = gs->count;
136
137	if ((len = _GB2312_check(s, n)) < 0)
138		return ((size_t)len);
139	wc = 0;
140	i = len;
141	while (i-- > 0)
142		wc = (wc << 8) | (unsigned char)*s++;
143	if (pwc != NULL)
144		*pwc = wc;
145	gs->count = 0;
146	return (wc == L'\0' ? 0 : len - ocount);
147}
148
149static size_t
150_GB2312_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps)
151{
152	_GB2312State *gs;
153
154	gs = (_GB2312State *)ps;
155
156	if (gs->count != 0) {
157		errno = EINVAL;
158		return ((size_t)-1);
159	}
160
161	if (s == NULL)
162		/* Reset to initial shift state (no-op) */
163		return (1);
164	if (wc & 0x8000) {
165		*s++ = (wc >> 8) & 0xff;
166		*s = wc & 0xff;
167		return (2);
168	}
169	*s = wc & 0xff;
170	return (1);
171}
172
173static size_t
174_GB2312_mbsnrtowcs(wchar_t * __restrict dst,
175    const char ** __restrict src, size_t nms, size_t len,
176    mbstate_t * __restrict ps)
177{
178	return (__mbsnrtowcs_std(dst, src, nms, len, ps, _GB2312_mbrtowc));
179}
180
181static size_t
182_GB2312_wcsnrtombs(char * __restrict dst,
183    const wchar_t ** __restrict src, size_t nwc, size_t len,
184    mbstate_t * __restrict ps)
185{
186	return (__wcsnrtombs_std(dst, src, nwc, len, ps, _GB2312_wcrtomb));
187}
188