| 1 | /* Convert multibyte character to wide character. |
| 2 | Copyright (C) 1999-2002, 2005-2020 Free Software Foundation, Inc. |
| 3 | |
| 4 | This program is free software: you can redistribute it and/or modify |
| 5 | it under the terms of the GNU General Public License as published by |
| 6 | the Free Software Foundation; either version 3 of the License, or |
| 7 | (at your option) any later version. |
| 8 | |
| 9 | This program is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | GNU General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU General Public License |
| 15 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| 16 | |
| 17 | /* Written by Bruno Haible <bruno@clisp.org>, 2008. */ |
| 18 | |
| 19 | /* This file contains the part of the body of the mbrtowc and mbrtoc32 functions |
| 20 | that handles the special case of the UTF-8 encoding. */ |
| 21 | |
| 22 | /* Cf. unistr/u8-mbtouc.c. */ |
| 23 | unsigned char c = (unsigned char) p[0]; |
| 24 | |
| 25 | if (c < 0x80) |
| 26 | { |
| 27 | if (pwc != NULL) |
| 28 | *pwc = c; |
| 29 | res = (c == 0 ? 0 : 1); |
| 30 | goto success; |
| 31 | } |
| 32 | if (c >= 0xc2) |
| 33 | { |
| 34 | if (c < 0xe0) |
| 35 | { |
| 36 | if (m == 1) |
| 37 | goto incomplete; |
| 38 | else /* m >= 2 */ |
| 39 | { |
| 40 | unsigned char c2 = (unsigned char) p[1]; |
| 41 | |
| 42 | if ((c2 ^ 0x80) < 0x40) |
| 43 | { |
| 44 | if (pwc != NULL) |
| 45 | *pwc = ((unsigned int) (c & 0x1f) << 6) |
| 46 | | (unsigned int) (c2 ^ 0x80); |
| 47 | res = 2; |
| 48 | goto success; |
| 49 | } |
| 50 | } |
| 51 | } |
| 52 | else if (c < 0xf0) |
| 53 | { |
| 54 | if (m == 1) |
| 55 | goto incomplete; |
| 56 | else |
| 57 | { |
| 58 | unsigned char c2 = (unsigned char) p[1]; |
| 59 | |
| 60 | if ((c2 ^ 0x80) < 0x40 |
| 61 | && (c >= 0xe1 || c2 >= 0xa0) |
| 62 | && (c != 0xed || c2 < 0xa0)) |
| 63 | { |
| 64 | if (m == 2) |
| 65 | goto incomplete; |
| 66 | else /* m >= 3 */ |
| 67 | { |
| 68 | unsigned char c3 = (unsigned char) p[2]; |
| 69 | |
| 70 | if ((c3 ^ 0x80) < 0x40) |
| 71 | { |
| 72 | unsigned int wc = |
| 73 | (((unsigned int) (c & 0x0f) << 12) |
| 74 | | ((unsigned int) (c2 ^ 0x80) << 6) |
| 75 | | (unsigned int) (c3 ^ 0x80)); |
| 76 | |
| 77 | if (FITS_IN_CHAR_TYPE (wc)) |
| 78 | { |
| 79 | if (pwc != NULL) |
| 80 | *pwc = wc; |
| 81 | res = 3; |
| 82 | goto success; |
| 83 | } |
| 84 | } |
| 85 | } |
| 86 | } |
| 87 | } |
| 88 | } |
| 89 | else if (c <= 0xf4) |
| 90 | { |
| 91 | if (m == 1) |
| 92 | goto incomplete; |
| 93 | else |
| 94 | { |
| 95 | unsigned char c2 = (unsigned char) p[1]; |
| 96 | |
| 97 | if ((c2 ^ 0x80) < 0x40 |
| 98 | && (c >= 0xf1 || c2 >= 0x90) |
| 99 | && (c < 0xf4 || (c == 0xf4 && c2 < 0x90))) |
| 100 | { |
| 101 | if (m == 2) |
| 102 | goto incomplete; |
| 103 | else |
| 104 | { |
| 105 | unsigned char c3 = (unsigned char) p[2]; |
| 106 | |
| 107 | if ((c3 ^ 0x80) < 0x40) |
| 108 | { |
| 109 | if (m == 3) |
| 110 | goto incomplete; |
| 111 | else /* m >= 4 */ |
| 112 | { |
| 113 | unsigned char c4 = (unsigned char) p[3]; |
| 114 | |
| 115 | if ((c4 ^ 0x80) < 0x40) |
| 116 | { |
| 117 | unsigned int wc = |
| 118 | (((unsigned int) (c & 0x07) << 18) |
| 119 | | ((unsigned int) (c2 ^ 0x80) << 12) |
| 120 | | ((unsigned int) (c3 ^ 0x80) << 6) |
| 121 | | (unsigned int) (c4 ^ 0x80)); |
| 122 | |
| 123 | if (FITS_IN_CHAR_TYPE (wc)) |
| 124 | { |
| 125 | if (pwc != NULL) |
| 126 | *pwc = wc; |
| 127 | res = 4; |
| 128 | goto success; |
| 129 | } |
| 130 | } |
| 131 | } |
| 132 | } |
| 133 | } |
| 134 | } |
| 135 | } |
| 136 | } |
| 137 | } |
| 138 | goto invalid; |