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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 | } |