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24d56127 | 1 | /* Look at first character in UTF-8 string, returning an error code. |
5e69ceb7 | 2 | Copyright (C) 1999-2002, 2006-2007, 2009-2014 Free Software Foundation, Inc. |
24d56127 LC |
3 | Written by Bruno Haible <bruno@clisp.org>, 2001. |
4 | ||
5 | This program is free software: you can redistribute it and/or modify it | |
6 | under the terms of the GNU Lesser General Public License as published | |
7 | by the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <config.h> | |
19 | ||
20 | /* Specification. */ | |
21 | #include "unistr.h" | |
22 | ||
23 | int | |
24 | u8_mbtoucr (ucs4_t *puc, const uint8_t *s, size_t n) | |
25 | { | |
26 | uint8_t c = *s; | |
27 | ||
28 | if (c < 0x80) | |
29 | { | |
30 | *puc = c; | |
31 | return 1; | |
32 | } | |
33 | else if (c >= 0xc2) | |
34 | { | |
35 | if (c < 0xe0) | |
1cd4fffc LC |
36 | { |
37 | if (n >= 2) | |
38 | { | |
39 | if ((s[1] ^ 0x80) < 0x40) | |
40 | { | |
41 | *puc = ((unsigned int) (c & 0x1f) << 6) | |
42 | | (unsigned int) (s[1] ^ 0x80); | |
43 | return 2; | |
44 | } | |
45 | /* invalid multibyte character */ | |
46 | } | |
47 | else | |
48 | { | |
49 | /* incomplete multibyte character */ | |
50 | *puc = 0xfffd; | |
51 | return -2; | |
52 | } | |
53 | } | |
24d56127 | 54 | else if (c < 0xf0) |
1cd4fffc LC |
55 | { |
56 | if (n >= 2) | |
57 | { | |
58 | if ((s[1] ^ 0x80) < 0x40 | |
59 | && (c >= 0xe1 || s[1] >= 0xa0) | |
60 | && (c != 0xed || s[1] < 0xa0)) | |
61 | { | |
62 | if (n >= 3) | |
63 | { | |
64 | if ((s[2] ^ 0x80) < 0x40) | |
65 | { | |
66 | *puc = ((unsigned int) (c & 0x0f) << 12) | |
67 | | ((unsigned int) (s[1] ^ 0x80) << 6) | |
68 | | (unsigned int) (s[2] ^ 0x80); | |
69 | return 3; | |
70 | } | |
71 | /* invalid multibyte character */ | |
72 | } | |
73 | else | |
74 | { | |
75 | /* incomplete multibyte character */ | |
76 | *puc = 0xfffd; | |
77 | return -2; | |
78 | } | |
79 | } | |
80 | /* invalid multibyte character */ | |
81 | } | |
82 | else | |
83 | { | |
84 | /* incomplete multibyte character */ | |
85 | *puc = 0xfffd; | |
86 | return -2; | |
87 | } | |
88 | } | |
24d56127 | 89 | else if (c < 0xf8) |
1cd4fffc LC |
90 | { |
91 | if (n >= 2) | |
92 | { | |
93 | if ((s[1] ^ 0x80) < 0x40 | |
94 | && (c >= 0xf1 || s[1] >= 0x90) | |
24d56127 | 95 | #if 1 |
1cd4fffc | 96 | && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90)) |
24d56127 | 97 | #endif |
1cd4fffc LC |
98 | ) |
99 | { | |
100 | if (n >= 3) | |
101 | { | |
102 | if ((s[2] ^ 0x80) < 0x40) | |
103 | { | |
104 | if (n >= 4) | |
105 | { | |
106 | if ((s[3] ^ 0x80) < 0x40) | |
107 | { | |
108 | *puc = ((unsigned int) (c & 0x07) << 18) | |
109 | | ((unsigned int) (s[1] ^ 0x80) << 12) | |
110 | | ((unsigned int) (s[2] ^ 0x80) << 6) | |
111 | | (unsigned int) (s[3] ^ 0x80); | |
112 | return 4; | |
113 | } | |
114 | /* invalid multibyte character */ | |
115 | } | |
116 | else | |
117 | { | |
118 | /* incomplete multibyte character */ | |
119 | *puc = 0xfffd; | |
120 | return -2; | |
121 | } | |
122 | } | |
123 | /* invalid multibyte character */ | |
124 | } | |
125 | else | |
126 | { | |
127 | /* incomplete multibyte character */ | |
128 | *puc = 0xfffd; | |
129 | return -2; | |
130 | } | |
131 | } | |
132 | /* invalid multibyte character */ | |
133 | } | |
134 | else | |
135 | { | |
136 | /* incomplete multibyte character */ | |
137 | *puc = 0xfffd; | |
138 | return -2; | |
139 | } | |
140 | } | |
24d56127 LC |
141 | #if 0 |
142 | else if (c < 0xfc) | |
1cd4fffc LC |
143 | { |
144 | if (n >= 2) | |
145 | { | |
146 | if ((s[1] ^ 0x80) < 0x40 | |
147 | && (c >= 0xf9 || s[1] >= 0x88)) | |
148 | { | |
149 | if (n >= 3) | |
150 | { | |
151 | if ((s[2] ^ 0x80) < 0x40) | |
152 | { | |
153 | if (n >= 4) | |
154 | { | |
155 | if ((s[3] ^ 0x80) < 0x40) | |
156 | { | |
157 | if (n >= 5) | |
158 | { | |
159 | if ((s[4] ^ 0x80) < 0x40) | |
160 | { | |
161 | *puc = ((unsigned int) (c & 0x03) << 24) | |
162 | | ((unsigned int) (s[1] ^ 0x80) << 18) | |
163 | | ((unsigned int) (s[2] ^ 0x80) << 12) | |
164 | | ((unsigned int) (s[3] ^ 0x80) << 6) | |
165 | | (unsigned int) (s[4] ^ 0x80); | |
166 | return 5; | |
167 | } | |
168 | /* invalid multibyte character */ | |
169 | } | |
170 | else | |
171 | { | |
172 | /* incomplete multibyte character */ | |
173 | *puc = 0xfffd; | |
174 | return -2; | |
175 | } | |
176 | } | |
177 | /* invalid multibyte character */ | |
178 | } | |
179 | else | |
180 | { | |
181 | /* incomplete multibyte character */ | |
182 | *puc = 0xfffd; | |
183 | return -2; | |
184 | } | |
185 | } | |
186 | /* invalid multibyte character */ | |
187 | } | |
188 | else | |
189 | { | |
190 | /* incomplete multibyte character */ | |
191 | *puc = 0xfffd; | |
192 | return -2; | |
193 | } | |
194 | } | |
195 | /* invalid multibyte character */ | |
196 | } | |
197 | else | |
198 | { | |
199 | /* incomplete multibyte character */ | |
200 | *puc = 0xfffd; | |
201 | return -2; | |
202 | } | |
203 | } | |
24d56127 | 204 | else if (c < 0xfe) |
1cd4fffc LC |
205 | { |
206 | if (n >= 2) | |
207 | { | |
208 | if ((s[1] ^ 0x80) < 0x40 | |
209 | && (c >= 0xfd || s[1] >= 0x84)) | |
210 | { | |
211 | if (n >= 3) | |
212 | { | |
213 | if ((s[2] ^ 0x80) < 0x40) | |
214 | { | |
215 | if (n >= 4) | |
216 | { | |
217 | if ((s[3] ^ 0x80) < 0x40) | |
218 | { | |
219 | if (n >= 5) | |
220 | { | |
221 | if ((s[4] ^ 0x80) < 0x40) | |
222 | { | |
223 | if (n >= 6) | |
224 | { | |
225 | if ((s[5] ^ 0x80) < 0x40) | |
226 | { | |
227 | *puc = ((unsigned int) (c & 0x01) << 30) | |
228 | | ((unsigned int) (s[1] ^ 0x80) << 24) | |
229 | | ((unsigned int) (s[2] ^ 0x80) << 18) | |
230 | | ((unsigned int) (s[3] ^ 0x80) << 12) | |
231 | | ((unsigned int) (s[4] ^ 0x80) << 6) | |
232 | | (unsigned int) (s[5] ^ 0x80); | |
233 | return 6; | |
234 | } | |
235 | /* invalid multibyte character */ | |
236 | } | |
237 | else | |
238 | { | |
239 | /* incomplete multibyte character */ | |
240 | *puc = 0xfffd; | |
241 | return -2; | |
242 | } | |
243 | } | |
244 | /* invalid multibyte character */ | |
245 | } | |
246 | else | |
247 | { | |
248 | /* incomplete multibyte character */ | |
249 | *puc = 0xfffd; | |
250 | return -2; | |
251 | } | |
252 | } | |
253 | /* invalid multibyte character */ | |
254 | } | |
255 | else | |
256 | { | |
257 | /* incomplete multibyte character */ | |
258 | *puc = 0xfffd; | |
259 | return -2; | |
260 | } | |
261 | } | |
262 | /* invalid multibyte character */ | |
263 | } | |
264 | else | |
265 | { | |
266 | /* incomplete multibyte character */ | |
267 | *puc = 0xfffd; | |
268 | return -2; | |
269 | } | |
270 | } | |
271 | /* invalid multibyte character */ | |
272 | } | |
273 | else | |
274 | { | |
275 | /* incomplete multibyte character */ | |
276 | *puc = 0xfffd; | |
277 | return -2; | |
278 | } | |
279 | } | |
24d56127 LC |
280 | #endif |
281 | } | |
282 | /* invalid multibyte character */ | |
283 | *puc = 0xfffd; | |
284 | return -1; | |
285 | } |