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24d56127 | 1 | /* Look at first character in UTF-8 string. |
f0007cad | 2 | Copyright (C) 1999-2002, 2006-2007, 2009-2012 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 | #if defined IN_LIBUNISTRING | |
21 | /* Tell unistr.h to declare u8_mbtouc_unsafe as 'extern', not | |
22 | 'static inline'. */ | |
23 | # include "unistring-notinline.h" | |
24 | #endif | |
25 | ||
26 | /* Specification. */ | |
27 | #include "unistr.h" | |
28 | ||
29 | #if !HAVE_INLINE | |
30 | ||
31 | int | |
32 | u8_mbtouc_unsafe (ucs4_t *puc, const uint8_t *s, size_t n) | |
33 | { | |
34 | uint8_t c = *s; | |
35 | ||
36 | if (c < 0x80) | |
37 | { | |
38 | *puc = c; | |
39 | return 1; | |
40 | } | |
41 | else if (c >= 0xc2) | |
42 | { | |
43 | if (c < 0xe0) | |
1cd4fffc LC |
44 | { |
45 | if (n >= 2) | |
46 | { | |
24d56127 | 47 | #if CONFIG_UNICODE_SAFETY |
1cd4fffc | 48 | if ((s[1] ^ 0x80) < 0x40) |
24d56127 | 49 | #endif |
1cd4fffc LC |
50 | { |
51 | *puc = ((unsigned int) (c & 0x1f) << 6) | |
52 | | (unsigned int) (s[1] ^ 0x80); | |
53 | return 2; | |
54 | } | |
0f00f2c3 | 55 | #if CONFIG_UNICODE_SAFETY |
1cd4fffc | 56 | /* invalid multibyte character */ |
0f00f2c3 | 57 | #endif |
1cd4fffc LC |
58 | } |
59 | else | |
60 | { | |
61 | /* incomplete multibyte character */ | |
62 | *puc = 0xfffd; | |
0f00f2c3 | 63 | return 1; |
1cd4fffc LC |
64 | } |
65 | } | |
24d56127 | 66 | else if (c < 0xf0) |
1cd4fffc LC |
67 | { |
68 | if (n >= 3) | |
69 | { | |
24d56127 | 70 | #if CONFIG_UNICODE_SAFETY |
0f00f2c3 | 71 | if ((s[1] ^ 0x80) < 0x40) |
1cd4fffc | 72 | { |
0f00f2c3 LC |
73 | if ((s[2] ^ 0x80) < 0x40) |
74 | { | |
75 | if ((c >= 0xe1 || s[1] >= 0xa0) | |
76 | && (c != 0xed || s[1] < 0xa0)) | |
77 | #endif | |
78 | { | |
79 | *puc = ((unsigned int) (c & 0x0f) << 12) | |
80 | | ((unsigned int) (s[1] ^ 0x80) << 6) | |
81 | | (unsigned int) (s[2] ^ 0x80); | |
82 | return 3; | |
83 | } | |
84 | #if CONFIG_UNICODE_SAFETY | |
85 | /* invalid multibyte character */ | |
86 | *puc = 0xfffd; | |
87 | return 3; | |
88 | } | |
89 | /* invalid multibyte character */ | |
90 | *puc = 0xfffd; | |
91 | return 2; | |
1cd4fffc LC |
92 | } |
93 | /* invalid multibyte character */ | |
0f00f2c3 | 94 | #endif |
1cd4fffc LC |
95 | } |
96 | else | |
97 | { | |
98 | /* incomplete multibyte character */ | |
99 | *puc = 0xfffd; | |
0f00f2c3 LC |
100 | if (n == 1 || (s[1] ^ 0x80) >= 0x40) |
101 | return 1; | |
102 | else | |
103 | return 2; | |
1cd4fffc LC |
104 | } |
105 | } | |
24d56127 | 106 | else if (c < 0xf8) |
1cd4fffc LC |
107 | { |
108 | if (n >= 4) | |
109 | { | |
24d56127 | 110 | #if CONFIG_UNICODE_SAFETY |
0f00f2c3 LC |
111 | if ((s[1] ^ 0x80) < 0x40) |
112 | { | |
113 | if ((s[2] ^ 0x80) < 0x40) | |
114 | { | |
115 | if ((s[3] ^ 0x80) < 0x40) | |
116 | { | |
117 | if ((c >= 0xf1 || s[1] >= 0x90) | |
24d56127 | 118 | #if 1 |
0f00f2c3 | 119 | && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90)) |
24d56127 | 120 | #endif |
0f00f2c3 | 121 | ) |
24d56127 | 122 | #endif |
0f00f2c3 LC |
123 | { |
124 | *puc = ((unsigned int) (c & 0x07) << 18) | |
125 | | ((unsigned int) (s[1] ^ 0x80) << 12) | |
126 | | ((unsigned int) (s[2] ^ 0x80) << 6) | |
127 | | (unsigned int) (s[3] ^ 0x80); | |
128 | return 4; | |
129 | } | |
130 | #if CONFIG_UNICODE_SAFETY | |
131 | /* invalid multibyte character */ | |
132 | *puc = 0xfffd; | |
133 | return 4; | |
134 | } | |
135 | /* invalid multibyte character */ | |
136 | *puc = 0xfffd; | |
137 | return 3; | |
138 | } | |
139 | /* invalid multibyte character */ | |
140 | *puc = 0xfffd; | |
141 | return 2; | |
1cd4fffc LC |
142 | } |
143 | /* invalid multibyte character */ | |
0f00f2c3 | 144 | #endif |
1cd4fffc LC |
145 | } |
146 | else | |
147 | { | |
148 | /* incomplete multibyte character */ | |
149 | *puc = 0xfffd; | |
0f00f2c3 LC |
150 | if (n == 1 || (s[1] ^ 0x80) >= 0x40) |
151 | return 1; | |
152 | else if (n == 2 || (s[2] ^ 0x80) >= 0x40) | |
153 | return 2; | |
154 | else | |
155 | return 3; | |
1cd4fffc LC |
156 | } |
157 | } | |
24d56127 LC |
158 | #if 0 |
159 | else if (c < 0xfc) | |
1cd4fffc LC |
160 | { |
161 | if (n >= 5) | |
162 | { | |
24d56127 | 163 | #if CONFIG_UNICODE_SAFETY |
0f00f2c3 | 164 | if ((s[1] ^ 0x80) < 0x40) |
1cd4fffc | 165 | { |
0f00f2c3 LC |
166 | if ((s[2] ^ 0x80) < 0x40) |
167 | { | |
168 | if ((s[3] ^ 0x80) < 0x40) | |
169 | { | |
170 | if ((s[4] ^ 0x80) < 0x40) | |
171 | { | |
172 | if (c >= 0xf9 || s[1] >= 0x88) | |
173 | #endif | |
174 | { | |
175 | *puc = ((unsigned int) (c & 0x03) << 24) | |
176 | | ((unsigned int) (s[1] ^ 0x80) << 18) | |
177 | | ((unsigned int) (s[2] ^ 0x80) << 12) | |
178 | | ((unsigned int) (s[3] ^ 0x80) << 6) | |
179 | | (unsigned int) (s[4] ^ 0x80); | |
180 | return 5; | |
181 | } | |
182 | #if CONFIG_UNICODE_SAFETY | |
183 | /* invalid multibyte character */ | |
184 | *puc = 0xfffd; | |
185 | return 5; | |
186 | } | |
187 | /* invalid multibyte character */ | |
188 | *puc = 0xfffd; | |
189 | return 4; | |
190 | } | |
191 | /* invalid multibyte character */ | |
192 | *puc = 0xfffd; | |
193 | return 3; | |
194 | } | |
195 | /* invalid multibyte character */ | |
196 | return 2; | |
1cd4fffc LC |
197 | } |
198 | /* invalid multibyte character */ | |
0f00f2c3 | 199 | #endif |
1cd4fffc LC |
200 | } |
201 | else | |
202 | { | |
203 | /* incomplete multibyte character */ | |
204 | *puc = 0xfffd; | |
205 | return n; | |
206 | } | |
207 | } | |
24d56127 | 208 | else if (c < 0xfe) |
1cd4fffc LC |
209 | { |
210 | if (n >= 6) | |
211 | { | |
24d56127 | 212 | #if CONFIG_UNICODE_SAFETY |
0f00f2c3 | 213 | if ((s[1] ^ 0x80) < 0x40) |
1cd4fffc | 214 | { |
0f00f2c3 LC |
215 | if ((s[2] ^ 0x80) < 0x40) |
216 | { | |
217 | if ((s[3] ^ 0x80) < 0x40) | |
218 | { | |
219 | if ((s[4] ^ 0x80) < 0x40) | |
220 | { | |
221 | if ((s[5] ^ 0x80) < 0x40) | |
222 | { | |
223 | if (c >= 0xfd || s[1] >= 0x84) | |
224 | #endif | |
225 | { | |
226 | *puc = ((unsigned int) (c & 0x01) << 30) | |
227 | | ((unsigned int) (s[1] ^ 0x80) << 24) | |
228 | | ((unsigned int) (s[2] ^ 0x80) << 18) | |
229 | | ((unsigned int) (s[3] ^ 0x80) << 12) | |
230 | | ((unsigned int) (s[4] ^ 0x80) << 6) | |
231 | | (unsigned int) (s[5] ^ 0x80); | |
232 | return 6; | |
233 | } | |
234 | #if CONFIG_UNICODE_SAFETY | |
235 | /* invalid multibyte character */ | |
236 | *puc = 0xfffd; | |
237 | return 6; | |
238 | } | |
239 | /* invalid multibyte character */ | |
240 | *puc = 0xfffd; | |
241 | return 5; | |
242 | } | |
243 | /* invalid multibyte character */ | |
244 | *puc = 0xfffd; | |
245 | return 4; | |
246 | } | |
247 | /* invalid multibyte character */ | |
248 | *puc = 0xfffd; | |
249 | return 3; | |
250 | } | |
251 | /* invalid multibyte character */ | |
252 | return 2; | |
1cd4fffc LC |
253 | } |
254 | /* invalid multibyte character */ | |
0f00f2c3 | 255 | #endif |
1cd4fffc LC |
256 | } |
257 | else | |
258 | { | |
259 | /* incomplete multibyte character */ | |
260 | *puc = 0xfffd; | |
261 | return n; | |
262 | } | |
263 | } | |
24d56127 LC |
264 | #endif |
265 | } | |
266 | /* invalid multibyte character */ | |
267 | *puc = 0xfffd; | |
268 | return 1; | |
269 | } | |
270 | ||
271 | #endif |