| 1 | /* Look at first character in UTF-8 string, returning an error code.
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| 2 | Copyright (C) 1999-2002, 2006-2007, 2009-2021 Free Software Foundation, Inc.
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| 3 | Written by Bruno Haible <[email protected]>, 2001.
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| 4 |
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| 5 | This file is free software: you can redistribute it and/or modify
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| 6 | it under the terms of the GNU Lesser General Public License as
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| 7 | published by the Free Software Foundation; either version 2.1 of the
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| 8 | License, or (at your option) any later version.
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| 9 |
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| 10 | This file 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
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| 13 | GNU Lesser 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 Lesser General Public License
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| 16 | along with this program. If not, see <https://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 | && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90)))
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| 96 | {
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| 97 | if (n >= 3)
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| 98 | {
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| 99 | if ((s[2] ^ 0x80) < 0x40)
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| 100 | {
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| 101 | if (n >= 4)
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| 102 | {
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| 103 | if ((s[3] ^ 0x80) < 0x40)
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| 104 | {
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| 105 | *puc = ((unsigned int) (c & 0x07) << 18)
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| 106 | | ((unsigned int) (s[1] ^ 0x80) << 12)
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| 107 | | ((unsigned int) (s[2] ^ 0x80) << 6)
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| 108 | | (unsigned int) (s[3] ^ 0x80);
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| 109 | return 4;
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| 110 | }
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| 111 | /* invalid multibyte character */
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| 112 | }
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| 113 | else
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| 114 | {
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| 115 | /* incomplete multibyte character */
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| 116 | *puc = 0xfffd;
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| 117 | return -2;
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| 118 | }
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| 119 | }
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| 120 | /* invalid multibyte character */
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| 121 | }
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| 122 | else
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| 123 | {
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| 124 | /* incomplete multibyte character */
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| 125 | *puc = 0xfffd;
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| 126 | return -2;
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| 127 | }
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| 128 | }
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| 129 | /* invalid multibyte character */
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| 130 | }
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| 131 | else
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| 132 | {
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| 133 | /* incomplete multibyte character */
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| 134 | *puc = 0xfffd;
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| 135 | return -2;
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| 136 | }
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| 137 | }
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| 138 | }
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| 139 | /* invalid multibyte character */
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| 140 | *puc = 0xfffd;
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| 141 | return -1;
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| 142 | }
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