1 /* Look at first character in UTF-8 string, returning an error code. 2 Copyright (C) 1999-2002, 2006-2007, 2009-2012 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 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 General Public License for more details. 14 15 You should have received a copy of the GNU 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 } 286