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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/param.h>
39__FBSDID("$FreeBSD: src/lib/libc/locale/gbk.c,v 1.11 2004/05/17 11:16:14 tjr Exp $");
40
41#include <errno.h>
42#include <runetype.h>
43#include <stdlib.h>
44#include <string.h>
45#include <wchar.h>
46#include "mblocal.h"
47
48int _GBK_init(_RuneLocale *);
49size_t _GBK_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t,
50 mbstate_t * __restrict);
51int _GBK_mbsinit(const mbstate_t *);
52size_t _GBK_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict);
53
54typedef struct {
55 wchar_t ch;
56} _GBKState;
57
58int
59_GBK_init(_RuneLocale *rl)
60{
61
62 __mbrtowc = _GBK_mbrtowc;
63 __wcrtomb = _GBK_wcrtomb;
64 __mbsinit = _GBK_mbsinit;
65 _CurrentRuneLocale = rl;
66 __mb_cur_max = 2;
67 return (0);
68}
69
70int
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
85size_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
146size_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}