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: src/lib/libc/locale/gbk.c,v 1.14 2007/10/13 16:28:21 ache Exp $");
36
37#include "xlocale_private.h"
38
39#include <sys/types.h>
40#include <errno.h>
41#include <runetype.h>
42#include <stdlib.h>
43#include <string.h>
44#include <wchar.h>
45#include "mblocal.h"
46
47static size_t	_GBK_mbrtowc(wchar_t * __restrict, const char * __restrict,
48		    size_t, mbstate_t * __restrict, locale_t);
49static int	_GBK_mbsinit(const mbstate_t *, locale_t);
50static size_t	_GBK_wcrtomb(char * __restrict, wchar_t,
51		    mbstate_t * __restrict, locale_t);
52
53typedef struct {
54	wchar_t	ch;
55} _GBKState;
56
57int
58_GBK_init(struct __xlocale_st_runelocale *xrl)
59{
60
61	xrl->__mbrtowc = _GBK_mbrtowc;
62	xrl->__wcrtomb = _GBK_wcrtomb;
63	xrl->__mbsinit = _GBK_mbsinit;
64	xrl->__mb_cur_max = 2;
65	xrl->__mb_sb_limit = 128;
66	return (0);
67}
68
69static int
70_GBK_mbsinit(const mbstate_t *ps, locale_t loc __unused)
71{
72
73	return (ps == NULL || ((const _GBKState *)ps)->ch == 0);
74}
75
76static __inline int
77_gbk_check(u_int c)
78{
79
80	c &= 0xff;
81	return ((c >= 0x81 && c <= 0xfe) ? 2 : 1);
82}
83
84static size_t
85_GBK_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
86    mbstate_t * __restrict ps, locale_t loc __unused)
87{
88	_GBKState *gs;
89	wchar_t wc;
90	size_t len;
91
92	gs = (_GBKState *)ps;
93
94	if ((gs->ch & ~0xFF) != 0) {
95		/* Bad conversion state. */
96		errno = EINVAL;
97		return ((size_t)-1);
98	}
99
100	if (s == NULL) {
101		s = "";
102		n = 1;
103		pwc = NULL;
104	}
105
106	if (n == 0)
107		/* Incomplete multibyte sequence */
108		return ((size_t)-2);
109
110	if (gs->ch != 0) {
111		if (*s == '\0') {
112			errno = EILSEQ;
113			return ((size_t)-1);
114		}
115		wc = (gs->ch << 8) | (*s & 0xFF);
116		if (pwc != NULL)
117			*pwc = wc;
118		gs->ch = 0;
119		return (1);
120	}
121
122	len = (size_t)_gbk_check(*s);
123	wc = *s++ & 0xff;
124	if (len == 2) {
125		if (n < 2) {
126			/* Incomplete multibyte sequence */
127			gs->ch = wc;
128			return ((size_t)-2);
129		}
130		if (*s == '\0') {
131			errno = EILSEQ;
132			return ((size_t)-1);
133		}
134		wc = (wc << 8) | (*s++ & 0xff);
135		if (pwc != NULL)
136			*pwc = wc;
137                return (2);
138	} else {
139		if (pwc != NULL)
140			*pwc = wc;
141		return (wc == L'\0' ? 0 : 1);
142	}
143}
144
145static size_t
146_GBK_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps, locale_t loc __unused)
147{
148	_GBKState *gs;
149
150	gs = (_GBKState *)ps;
151
152	if (gs->ch != 0) {
153		errno = EINVAL;
154		return ((size_t)-1);
155	}
156
157	if (s == NULL)
158		/* Reset to initial shift state (no-op) */
159		return (1);
160	if (wc & 0x8000) {
161		*s++ = (wc >> 8) & 0xff;
162		*s = wc & 0xff;
163		return (2);
164	}
165	*s = wc & 0xff;
166	return (1);
167}
168