1/* Look at first character in UTF-8 string. 2 Copyright (C) 1999-2002, 2006-2007, 2009-2010 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#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 31int 32u8_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) 44 { 45 if (n >= 2) 46 { 47#if CONFIG_UNICODE_SAFETY 48 if ((s[1] ^ 0x80) < 0x40) 49#endif 50 { 51 *puc = ((unsigned int) (c & 0x1f) << 6) 52 | (unsigned int) (s[1] ^ 0x80); 53 return 2; 54 } 55 /* invalid multibyte character */ 56 } 57 else 58 { 59 /* incomplete multibyte character */ 60 *puc = 0xfffd; 61 return n; 62 } 63 } 64 else if (c < 0xf0) 65 { 66 if (n >= 3) 67 { 68#if CONFIG_UNICODE_SAFETY 69 if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 70 && (c >= 0xe1 || s[1] >= 0xa0) 71 && (c != 0xed || s[1] < 0xa0)) 72#endif 73 { 74 *puc = ((unsigned int) (c & 0x0f) << 12) 75 | ((unsigned int) (s[1] ^ 0x80) << 6) 76 | (unsigned int) (s[2] ^ 0x80); 77 return 3; 78 } 79 /* invalid multibyte character */ 80 } 81 else 82 { 83 /* incomplete multibyte character */ 84 *puc = 0xfffd; 85 return n; 86 } 87 } 88 else if (c < 0xf8) 89 { 90 if (n >= 4) 91 { 92#if CONFIG_UNICODE_SAFETY 93 if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 94 && (s[3] ^ 0x80) < 0x40 95 && (c >= 0xf1 || s[1] >= 0x90) 96#if 1 97 && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90)) 98#endif 99 ) 100#endif 101 { 102 *puc = ((unsigned int) (c & 0x07) << 18) 103 | ((unsigned int) (s[1] ^ 0x80) << 12) 104 | ((unsigned int) (s[2] ^ 0x80) << 6) 105 | (unsigned int) (s[3] ^ 0x80); 106 return 4; 107 } 108 /* invalid multibyte character */ 109 } 110 else 111 { 112 /* incomplete multibyte character */ 113 *puc = 0xfffd; 114 return n; 115 } 116 } 117#if 0 118 else if (c < 0xfc) 119 { 120 if (n >= 5) 121 { 122#if CONFIG_UNICODE_SAFETY 123 if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 124 && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40 125 && (c >= 0xf9 || s[1] >= 0x88)) 126#endif 127 { 128 *puc = ((unsigned int) (c & 0x03) << 24) 129 | ((unsigned int) (s[1] ^ 0x80) << 18) 130 | ((unsigned int) (s[2] ^ 0x80) << 12) 131 | ((unsigned int) (s[3] ^ 0x80) << 6) 132 | (unsigned int) (s[4] ^ 0x80); 133 return 5; 134 } 135 /* invalid multibyte character */ 136 } 137 else 138 { 139 /* incomplete multibyte character */ 140 *puc = 0xfffd; 141 return n; 142 } 143 } 144 else if (c < 0xfe) 145 { 146 if (n >= 6) 147 { 148#if CONFIG_UNICODE_SAFETY 149 if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 150 && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40 151 && (s[5] ^ 0x80) < 0x40 152 && (c >= 0xfd || s[1] >= 0x84)) 153#endif 154 { 155 *puc = ((unsigned int) (c & 0x01) << 30) 156 | ((unsigned int) (s[1] ^ 0x80) << 24) 157 | ((unsigned int) (s[2] ^ 0x80) << 18) 158 | ((unsigned int) (s[3] ^ 0x80) << 12) 159 | ((unsigned int) (s[4] ^ 0x80) << 6) 160 | (unsigned int) (s[5] ^ 0x80); 161 return 6; 162 } 163 /* invalid multibyte character */ 164 } 165 else 166 { 167 /* incomplete multibyte character */ 168 *puc = 0xfffd; 169 return n; 170 } 171 } 172#endif 173 } 174 /* invalid multibyte character */ 175 *puc = 0xfffd; 176 return 1; 177} 178 179#endif 180