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[apple/libc.git] / locale / FreeBSD / gb18030.c
1 /*-
2 * Copyright (c) 2002-2004 Tim J. Robbins
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26 /*
27 * PRC National Standard GB 18030-2000 encoding of Chinese text.
28 *
29 * See gb18030(5) for details.
30 */
31
32 #include <sys/param.h>
33 __FBSDID("$FreeBSD: src/lib/libc/locale/gb18030.c,v 1.8 2007/10/13 16:28:21 ache Exp $");
34
35 #include "xlocale_private.h"
36
37 #include <errno.h>
38 #include <runetype.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <wchar.h>
42 #include "mblocal.h"
43
44 #define GB18030_MB_CUR_MAX 4
45
46 static size_t _GB18030_mbrtowc(wchar_t * __restrict, const char * __restrict,
47 size_t, mbstate_t * __restrict, locale_t);
48 static int _GB18030_mbsinit(const mbstate_t *, locale_t);
49 static size_t _GB18030_wcrtomb(char * __restrict, wchar_t,
50 mbstate_t * __restrict, locale_t);
51
52 typedef struct {
53 int count;
54 u_char bytes[4];
55 } _GB18030State;
56
57 int
58 _GB18030_init(struct __xlocale_st_runelocale *xrl)
59 {
60
61 xrl->__mbrtowc = _GB18030_mbrtowc;
62 xrl->__wcrtomb = _GB18030_wcrtomb;
63 xrl->__mbsinit = _GB18030_mbsinit;
64 xrl->__mb_cur_max = GB18030_MB_CUR_MAX;
65 xrl->__mb_sb_limit = 128;
66
67 return (0);
68 }
69
70 static int
71 _GB18030_mbsinit(const mbstate_t *ps, locale_t loc __unused)
72 {
73
74 return (ps == NULL || ((const _GB18030State *)ps)->count == 0);
75 }
76
77 static size_t
78 _GB18030_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s,
79 size_t n, mbstate_t * __restrict ps, locale_t loc __unused)
80 {
81 _GB18030State *gs;
82 wchar_t wch;
83 int ch, len, ocount;
84 size_t ncopy;
85
86 gs = (_GB18030State *)ps;
87
88 if (gs->count < 0 || gs->count > sizeof(gs->bytes)) {
89 errno = EINVAL;
90 return ((size_t)-1);
91 }
92
93 if (s == NULL) {
94 s = "";
95 n = 1;
96 pwc = NULL;
97 }
98
99 ncopy = MIN(MIN(n, GB18030_MB_CUR_MAX), sizeof(gs->bytes) - gs->count);
100 strncpy((char*)(gs->bytes + gs->count), s, ncopy);
101 ocount = gs->count;
102 gs->count += ncopy;
103 s = (char *)gs->bytes;
104 n = gs->count;
105
106 if (n == 0)
107 /* Incomplete multibyte sequence */
108 return ((size_t)-2);
109
110 /*
111 * Single byte: [00-7f]
112 * Two byte: [81-fe][40-7e,80-fe]
113 * Four byte: [81-fe][30-39][81-fe][30-39]
114 */
115 ch = (unsigned char)*s++;
116 if (ch <= 0x7f) {
117 len = 1;
118 wch = ch;
119 } else if (ch >= 0x81 && ch <= 0xfe) {
120 wch = ch;
121 if (n < 2)
122 return ((size_t)-2);
123 ch = (unsigned char)*s++;
124 if ((ch >= 0x40 && ch <= 0x7e) || (ch >= 0x80 && ch <= 0xfe)) {
125 wch = (wch << 8) | ch;
126 len = 2;
127 } else if (ch >= 0x30 && ch <= 0x39) {
128 /*
129 * Strip high bit off the wide character we will
130 * eventually output so that it is positive when
131 * cast to wint_t on 32-bit twos-complement machines.
132 */
133 wch = ((wch & 0x7f) << 8) | ch;
134 if (n < 3)
135 return ((size_t)-2);
136 ch = (unsigned char)*s++;
137 if (ch < 0x81 || ch > 0xfe)
138 goto ilseq;
139 wch = (wch << 8) | ch;
140 if (n < 4)
141 return ((size_t)-2);
142 ch = (unsigned char)*s++;
143 if (ch < 0x30 || ch > 0x39)
144 goto ilseq;
145 wch = (wch << 8) | ch;
146 len = 4;
147 } else
148 goto ilseq;
149 } else
150 goto ilseq;
151
152 if (pwc != NULL)
153 *pwc = wch;
154 gs->count = 0;
155 return (wch == L'\0' ? 0 : len - ocount);
156 ilseq:
157 errno = EILSEQ;
158 return ((size_t)-1);
159 }
160
161 static size_t
162 _GB18030_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps, locale_t loc __unused)
163 {
164 _GB18030State *gs;
165 size_t len;
166 int c;
167
168 gs = (_GB18030State *)ps;
169
170 if (gs->count != 0) {
171 errno = EINVAL;
172 return ((size_t)-1);
173 }
174
175 if (s == NULL)
176 /* Reset to initial shift state (no-op) */
177 return (1);
178 if ((wc & ~0x7fffffff) != 0)
179 goto ilseq;
180 if (wc & 0x7f000000) {
181 /* Replace high bit that mbrtowc() removed. */
182 wc |= 0x80000000;
183 c = (wc >> 24) & 0xff;
184 if (c < 0x81 || c > 0xfe)
185 goto ilseq;
186 *s++ = c;
187 c = (wc >> 16) & 0xff;
188 if (c < 0x30 || c > 0x39)
189 goto ilseq;
190 *s++ = c;
191 c = (wc >> 8) & 0xff;
192 if (c < 0x81 || c > 0xfe)
193 goto ilseq;
194 *s++ = c;
195 c = wc & 0xff;
196 if (c < 0x30 || c > 0x39)
197 goto ilseq;
198 *s++ = c;
199 len = 4;
200 } else if (wc & 0x00ff0000)
201 goto ilseq;
202 else if (wc & 0x0000ff00) {
203 c = (wc >> 8) & 0xff;
204 if (c < 0x81 || c > 0xfe)
205 goto ilseq;
206 *s++ = c;
207 c = wc & 0xff;
208 if (c < 0x40 || c == 0x7f || c == 0xff)
209 goto ilseq;
210 *s++ = c;
211 len = 2;
212 } else if (wc <= 0x7f) {
213 *s++ = wc;
214 len = 1;
215 } else
216 goto ilseq;
217
218 return (len);
219 ilseq:
220 errno = EILSEQ;
221 return ((size_t)-1);
222 }
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