| 1 | /* Look at first character in UTF-8 string, returning an error code. |
| 2 | Copyright (C) 1999-2002, 2006-2007, 2009-2014 Free Software Foundation, Inc. |
| 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) |
| 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 | } |
| 54 | else if (c < 0xf0) |
| 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 | } |
| 89 | else if (c < 0xf8) |
| 90 | { |
| 91 | if (n >= 2) |
| 92 | { |
| 93 | if ((s[1] ^ 0x80) < 0x40 |
| 94 | && (c >= 0xf1 || s[1] >= 0x90) |
| 95 | #if 1 |
| 96 | && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90)) |
| 97 | #endif |
| 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 | } |
| 141 | #if 0 |
| 142 | else if (c < 0xfc) |
| 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 | } |
| 204 | else if (c < 0xfe) |
| 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 | } |
| 280 | #endif |
| 281 | } |
| 282 | /* invalid multibyte character */ |
| 283 | *puc = 0xfffd; |
| 284 | return -1; |
| 285 | } |