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 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include "lint.h"
31 #include <sys/types.h>
32 #include <errno.h>
33 #include "runetype.h"
34 #include <stdlib.h>
35 #include <string.h>
36 #include <wchar.h>
37 #include "mblocal.h"
38 #include "lctype.h"
39
40 static size_t _GB2312_mbrtowc(wchar_t *_RESTRICT_KYWD,
41 const char *_RESTRICT_KYWD,
42 size_t, mbstate_t *_RESTRICT_KYWD);
43 static int _GB2312_mbsinit(const mbstate_t *);
44 static size_t _GB2312_wcrtomb(char *_RESTRICT_KYWD, wchar_t,
45 mbstate_t *_RESTRICT_KYWD);
46 static size_t _GB2312_mbsnrtowcs(wchar_t *_RESTRICT_KYWD,
47 const char **_RESTRICT_KYWD, size_t, size_t,
48 mbstate_t *_RESTRICT_KYWD);
49 static size_t _GB2312_wcsnrtombs(char *_RESTRICT_KYWD,
50 const wchar_t **_RESTRICT_KYWD, size_t, size_t,
51 mbstate_t *_RESTRICT_KYWD);
52
53
54 typedef struct {
55 int count;
56 uchar_t bytes[2];
57 } _GB2312State;
58
59 void
60 _GB2312_init(struct lc_ctype *lct)
61 {
62
63 lct->lc_mbrtowc = _GB2312_mbrtowc;
64 lct->lc_wcrtomb = _GB2312_wcrtomb;
65 lct->lc_mbsinit = _GB2312_mbsinit;
66 lct->lc_mbsnrtowcs = _GB2312_mbsnrtowcs;
67 lct->lc_wcsnrtombs = _GB2312_wcsnrtombs;
68 lct->lc_max_mblen = 2;
69 lct->lc_is_ascii = 0;
70 }
71
72 static int
73 _GB2312_mbsinit(const mbstate_t *ps)
74 {
75
76 return (ps == NULL || ((const _GB2312State *)ps)->count == 0);
77 }
78
79 static int
80 _GB2312_check(const char *str, size_t n)
81 {
82 const uchar_t *s = (const uchar_t *)str;
83
84 if (n == 0)
85 /* Incomplete multibyte sequence */
86 return (-2);
87 if (s[0] >= 0xa1 && s[0] <= 0xfe) {
88 if (n < 2)
89 /* Incomplete multibyte sequence */
90 return (-2);
91 if (s[1] < 0xa1 || s[1] > 0xfe)
92 /* Invalid multibyte sequence */
93 return (-1);
94 return (2);
95 } else if (s[0] & 0x80) {
96 /* Invalid multibyte sequence */
97 return (-1);
98 }
99 return (1);
100 }
101
102 static size_t
103 _GB2312_mbrtowc(wchar_t *_RESTRICT_KYWD pwc, const char *_RESTRICT_KYWD s,
104 size_t n, mbstate_t *_RESTRICT_KYWD ps)
105 {
106 _GB2312State *gs;
107 wchar_t wc;
108 int i, len, ocount;
109 size_t ncopy;
110
111 gs = (_GB2312State *)ps;
112
113 if (gs->count < 0 || gs->count > sizeof (gs->bytes)) {
114 errno = EINVAL;
115 return ((size_t)-1);
116 }
117
118 if (s == NULL) {
119 s = "";
120 n = 1;
121 pwc = NULL;
122 }
123
124 ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof (gs->bytes) - gs->count);
125 (void) memcpy(gs->bytes + gs->count, s, ncopy);
126 ocount = gs->count;
127 gs->count += ncopy;
128 s = (char *)gs->bytes;
129 n = gs->count;
130
131 if ((len = _GB2312_check(s, n)) < 0)
132 return ((size_t)len);
133 wc = 0;
134 i = len;
135 while (i-- > 0)
136 wc = (wc << 8) | (unsigned char)*s++;
137 if (pwc != NULL)
138 *pwc = wc;
139 gs->count = 0;
140 return (wc == L'\0' ? 0 : len - ocount);
141 }
142
143 static size_t
144 _GB2312_wcrtomb(char *_RESTRICT_KYWD s, wchar_t wc,
145 mbstate_t *_RESTRICT_KYWD ps)
146 {
147 _GB2312State *gs;
148
149 gs = (_GB2312State *)ps;
150
151 if (gs->count != 0) {
152 errno = EINVAL;
153 return ((size_t)-1);
154 }
155
156 if (s == NULL)
157 /* Reset to initial shift state (no-op) */
158 return (1);
159 if (wc & 0x8000) {
160 *s++ = (wc >> 8) & 0xff;
161 *s = wc & 0xff;
162 return (2);
163 }
164 *s = wc & 0xff;
165 return (1);
166 }
167
168 static size_t
169 _GB2312_mbsnrtowcs(wchar_t *_RESTRICT_KYWD dst,
170 const char **_RESTRICT_KYWD src, size_t nms, size_t len,
171 mbstate_t *_RESTRICT_KYWD ps)
172 {
173 return (__mbsnrtowcs_std(dst, src, nms, len, ps, _GB2312_mbrtowc));
174 }
175
176 static size_t
177 _GB2312_wcsnrtombs(char *_RESTRICT_KYWD dst,
178 const wchar_t **_RESTRICT_KYWD src, size_t nwc, size_t len,
179 mbstate_t *_RESTRICT_KYWD ps)
180 {
181 return (__wcsnrtombs_std(dst, src, nwc, len, ps, _GB2312_wcrtomb));
182 }