| 1 | /* Look at first character in UTF-8 string, returning an error code.
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| 2 | Copyright (C) 1999-2002, 2006-2007, 2009-2012 Free Software Foundation, Inc.
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| 3 | Written by Bruno Haible <bruno@clisp.org>, 2001.
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| 4 |
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| 5 | This program is free software: you can redistribute it and/or modify it
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| 6 | under the terms of the GNU General Public License as published
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| 7 | by the Free Software Foundation; either version 3 of the License, or
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| 8 | (at your option) any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 13 | General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */
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| 17 |
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| 18 | #include <config.h>
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| 19 |
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| 20 | /* Specification. */
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| 21 | #include "unistr.h"
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| 22 |
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| 23 | int
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| 24 | u8_mbtoucr (ucs4_t *puc, const uint8_t *s, size_t n)
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| 25 | {
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| 26 | uint8_t c = *s;
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| 27 |
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| 28 | if (c < 0x80)
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| 29 | {
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| 30 | *puc = c;
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| 31 | return 1;
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| 32 | }
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| 33 | else if (c >= 0xc2)
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| 34 | {
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| 35 | if (c < 0xe0)
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| 36 | {
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| 37 | if (n >= 2)
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| 38 | {
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| 39 | if ((s[1] ^ 0x80) < 0x40)
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| 40 | {
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| 41 | *puc = ((unsigned int) (c & 0x1f) << 6)
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| 42 | | (unsigned int) (s[1] ^ 0x80);
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| 43 | return 2;
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| 44 | }
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| 45 | /* invalid multibyte character */
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| 46 | }
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| 47 | else
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| 48 | {
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| 49 | /* incomplete multibyte character */
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| 50 | *puc = 0xfffd;
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| 51 | return -2;
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| 52 | }
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| 53 | }
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| 54 | else if (c < 0xf0)
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| 55 | {
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| 56 | if (n >= 2)
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| 57 | {
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| 58 | if ((s[1] ^ 0x80) < 0x40
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| 59 | && (c >= 0xe1 || s[1] >= 0xa0)
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| 60 | && (c != 0xed || s[1] < 0xa0))
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| 61 | {
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| 62 | if (n >= 3)
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| 63 | {
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| 64 | if ((s[2] ^ 0x80) < 0x40)
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| 65 | {
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| 66 | *puc = ((unsigned int) (c & 0x0f) << 12)
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| 67 | | ((unsigned int) (s[1] ^ 0x80) << 6)
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| 68 | | (unsigned int) (s[2] ^ 0x80);
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| 69 | return 3;
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| 70 | }
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| 71 | /* invalid multibyte character */
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| 72 | }
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| 73 | else
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| 74 | {
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| 75 | /* incomplete multibyte character */
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| 76 | *puc = 0xfffd;
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| 77 | return -2;
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| 78 | }
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| 79 | }
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| 80 | /* invalid multibyte character */
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| 81 | }
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| 82 | else
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| 83 | {
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| 84 | /* incomplete multibyte character */
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| 85 | *puc = 0xfffd;
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| 86 | return -2;
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| 87 | }
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| 88 | }
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| 89 | else if (c < 0xf8)
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| 90 | {
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| 91 | if (n >= 2)
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| 92 | {
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| 93 | if ((s[1] ^ 0x80) < 0x40
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| 94 | && (c >= 0xf1 || s[1] >= 0x90)
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| 95 | #if 1
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| 96 | && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90))
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| 97 | #endif
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| 98 | )
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| 99 | {
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| 100 | if (n >= 3)
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| 101 | {
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| 102 | if ((s[2] ^ 0x80) < 0x40)
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| 103 | {
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| 104 | if (n >= 4)
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| 105 | {
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| 106 | if ((s[3] ^ 0x80) < 0x40)
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| 107 | {
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| 108 | *puc = ((unsigned int) (c & 0x07) << 18)
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| 109 | | ((unsigned int) (s[1] ^ 0x80) << 12)
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| 110 | | ((unsigned int) (s[2] ^ 0x80) << 6)
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| 111 | | (unsigned int) (s[3] ^ 0x80);
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| 112 | return 4;
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| 113 | }
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| 114 | /* invalid multibyte character */
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| 115 | }
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| 116 | else
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| 117 | {
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| 118 | /* incomplete multibyte character */
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| 119 | *puc = 0xfffd;
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| 120 | return -2;
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| 121 | }
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| 122 | }
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| 123 | /* invalid multibyte character */
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| 124 | }
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| 125 | else
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| 126 | {
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| 127 | /* incomplete multibyte character */
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| 128 | *puc = 0xfffd;
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| 129 | return -2;
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| 130 | }
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| 131 | }
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| 132 | /* invalid multibyte character */
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| 133 | }
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| 134 | else
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| 135 | {
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| 136 | /* incomplete multibyte character */
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| 137 | *puc = 0xfffd;
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| 138 | return -2;
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| 139 | }
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| 140 | }
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| 141 | #if 0
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| 142 | else if (c < 0xfc)
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| 143 | {
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| 144 | if (n >= 2)
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| 145 | {
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| 146 | if ((s[1] ^ 0x80) < 0x40
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| 147 | && (c >= 0xf9 || s[1] >= 0x88))
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| 148 | {
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| 149 | if (n >= 3)
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| 150 | {
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| 151 | if ((s[2] ^ 0x80) < 0x40)
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| 152 | {
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| 153 | if (n >= 4)
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| 154 | {
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| 155 | if ((s[3] ^ 0x80) < 0x40)
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| 156 | {
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| 157 | if (n >= 5)
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| 158 | {
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| 159 | if ((s[4] ^ 0x80) < 0x40)
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| 160 | {
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| 161 | *puc = ((unsigned int) (c & 0x03) << 24)
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| 162 | | ((unsigned int) (s[1] ^ 0x80) << 18)
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| 163 | | ((unsigned int) (s[2] ^ 0x80) << 12)
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| 164 | | ((unsigned int) (s[3] ^ 0x80) << 6)
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| 165 | | (unsigned int) (s[4] ^ 0x80);
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| 166 | return 5;
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| 167 | }
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| 168 | /* invalid multibyte character */
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| 169 | }
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| 170 | else
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| 171 | {
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| 172 | /* incomplete multibyte character */
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| 173 | *puc = 0xfffd;
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| 174 | return -2;
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| 175 | }
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| 176 | }
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| 177 | /* invalid multibyte character */
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| 178 | }
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| 179 | else
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| 180 | {
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| 181 | /* incomplete multibyte character */
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| 182 | *puc = 0xfffd;
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| 183 | return -2;
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| 184 | }
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| 185 | }
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| 186 | /* invalid multibyte character */
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| 187 | }
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| 188 | else
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| 189 | {
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| 190 | /* incomplete multibyte character */
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| 191 | *puc = 0xfffd;
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| 192 | return -2;
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| 193 | }
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| 194 | }
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| 195 | /* invalid multibyte character */
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| 196 | }
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| 197 | else
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| 198 | {
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| 199 | /* incomplete multibyte character */
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| 200 | *puc = 0xfffd;
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| 201 | return -2;
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| 202 | }
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| 203 | }
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| 204 | else if (c < 0xfe)
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| 205 | {
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| 206 | if (n >= 2)
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| 207 | {
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| 208 | if ((s[1] ^ 0x80) < 0x40
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| 209 | && (c >= 0xfd || s[1] >= 0x84))
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| 210 | {
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| 211 | if (n >= 3)
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| 212 | {
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| 213 | if ((s[2] ^ 0x80) < 0x40)
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| 214 | {
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| 215 | if (n >= 4)
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| 216 | {
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| 217 | if ((s[3] ^ 0x80) < 0x40)
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| 218 | {
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| 219 | if (n >= 5)
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| 220 | {
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| 221 | if ((s[4] ^ 0x80) < 0x40)
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| 222 | {
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| 223 | if (n >= 6)
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| 224 | {
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| 225 | if ((s[5] ^ 0x80) < 0x40)
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| 226 | {
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| 227 | *puc = ((unsigned int) (c & 0x01) << 30)
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| 228 | | ((unsigned int) (s[1] ^ 0x80) << 24)
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| 229 | | ((unsigned int) (s[2] ^ 0x80) << 18)
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| 230 | | ((unsigned int) (s[3] ^ 0x80) << 12)
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| 231 | | ((unsigned int) (s[4] ^ 0x80) << 6)
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| 232 | | (unsigned int) (s[5] ^ 0x80);
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| 233 | return 6;
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| 234 | }
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| 235 | /* invalid multibyte character */
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| 236 | }
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| 237 | else
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| 238 | {
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| 239 | /* incomplete multibyte character */
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| 240 | *puc = 0xfffd;
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| 241 | return -2;
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| 242 | }
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| 243 | }
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| 244 | /* invalid multibyte character */
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| 245 | }
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| 246 | else
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| 247 | {
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| 248 | /* incomplete multibyte character */
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| 249 | *puc = 0xfffd;
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| 250 | return -2;
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| 251 | }
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| 252 | }
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| 253 | /* invalid multibyte character */
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| 254 | }
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| 255 | else
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| 256 | {
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| 257 | /* incomplete multibyte character */
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| 258 | *puc = 0xfffd;
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| 259 | return -2;
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| 260 | }
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| 261 | }
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| 262 | /* invalid multibyte character */
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| 263 | }
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| 264 | else
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| 265 | {
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| 266 | /* incomplete multibyte character */
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| 267 | *puc = 0xfffd;
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| 268 | return -2;
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| 269 | }
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| 270 | }
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| 271 | /* invalid multibyte character */
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| 272 | }
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| 273 | else
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| 274 | {
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| 275 | /* incomplete multibyte character */
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| 276 | *puc = 0xfffd;
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| 277 | return -2;
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| 278 | }
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| 279 | }
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| 280 | #endif
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| 281 | }
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| 282 | /* invalid multibyte character */
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| 283 | *puc = 0xfffd;
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| 284 | return -1;
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| 285 | }
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