| 1 | /* Convert multibyte character to wide character.
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| 2 | Copyright (C) 1999-2002, 2005-2021 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is free software: you can redistribute it and/or modify
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| 5 | it under the terms of the GNU Lesser General Public License as
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| 6 | published by the Free Software Foundation; either version 2.1 of the
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| 7 | License, or (at your option) any later version.
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| 8 |
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| 9 | This file is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU Lesser General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU Lesser General Public License
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| 15 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | /* Written by Bruno Haible <[email protected]>, 2008. */
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| 18 |
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| 19 | /* This file contains the part of the body of the mbrtowc and mbrtoc32 functions
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| 20 | that handles the special case of the UTF-8 encoding. */
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| 21 |
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| 22 | /* Cf. unistr/u8-mbtouc.c. */
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| 23 | unsigned char c = (unsigned char) p[0];
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| 24 |
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| 25 | if (c < 0x80)
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| 26 | {
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| 27 | if (pwc != NULL)
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| 28 | *pwc = c;
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| 29 | res = (c == 0 ? 0 : 1);
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| 30 | goto success;
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| 31 | }
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| 32 | if (c >= 0xc2)
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| 33 | {
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| 34 | if (c < 0xe0)
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| 35 | {
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| 36 | if (m == 1)
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| 37 | goto incomplete;
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| 38 | else /* m >= 2 */
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| 39 | {
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| 40 | unsigned char c2 = (unsigned char) p[1];
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| 41 |
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| 42 | if ((c2 ^ 0x80) < 0x40)
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| 43 | {
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| 44 | if (pwc != NULL)
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| 45 | *pwc = ((unsigned int) (c & 0x1f) << 6)
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| 46 | | (unsigned int) (c2 ^ 0x80);
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| 47 | res = 2;
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| 48 | goto success;
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| 49 | }
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| 50 | }
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| 51 | }
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| 52 | else if (c < 0xf0)
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| 53 | {
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| 54 | if (m == 1)
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| 55 | goto incomplete;
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| 56 | else
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| 57 | {
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| 58 | unsigned char c2 = (unsigned char) p[1];
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| 59 |
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| 60 | if ((c2 ^ 0x80) < 0x40
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| 61 | && (c >= 0xe1 || c2 >= 0xa0)
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| 62 | && (c != 0xed || c2 < 0xa0))
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| 63 | {
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| 64 | if (m == 2)
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| 65 | goto incomplete;
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| 66 | else /* m >= 3 */
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| 67 | {
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| 68 | unsigned char c3 = (unsigned char) p[2];
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| 69 |
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| 70 | if ((c3 ^ 0x80) < 0x40)
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| 71 | {
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| 72 | unsigned int wc =
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| 73 | (((unsigned int) (c & 0x0f) << 12)
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| 74 | | ((unsigned int) (c2 ^ 0x80) << 6)
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| 75 | | (unsigned int) (c3 ^ 0x80));
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| 76 |
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| 77 | if (FITS_IN_CHAR_TYPE (wc))
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| 78 | {
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| 79 | if (pwc != NULL)
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| 80 | *pwc = wc;
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| 81 | res = 3;
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| 82 | goto success;
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| 83 | }
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| 84 | }
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| 85 | }
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| 86 | }
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| 87 | }
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| 88 | }
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| 89 | else if (c <= 0xf4)
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| 90 | {
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| 91 | if (m == 1)
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| 92 | goto incomplete;
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| 93 | else
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| 94 | {
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| 95 | unsigned char c2 = (unsigned char) p[1];
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| 96 |
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| 97 | if ((c2 ^ 0x80) < 0x40
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| 98 | && (c >= 0xf1 || c2 >= 0x90)
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| 99 | && (c < 0xf4 || (/* c == 0xf4 && */ c2 < 0x90)))
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| 100 | {
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| 101 | if (m == 2)
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| 102 | goto incomplete;
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| 103 | else
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| 104 | {
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| 105 | unsigned char c3 = (unsigned char) p[2];
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| 106 |
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| 107 | if ((c3 ^ 0x80) < 0x40)
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| 108 | {
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| 109 | if (m == 3)
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| 110 | goto incomplete;
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| 111 | else /* m >= 4 */
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| 112 | {
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| 113 | unsigned char c4 = (unsigned char) p[3];
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| 114 |
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| 115 | if ((c4 ^ 0x80) < 0x40)
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| 116 | {
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| 117 | unsigned int wc =
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| 118 | (((unsigned int) (c & 0x07) << 18)
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| 119 | | ((unsigned int) (c2 ^ 0x80) << 12)
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| 120 | | ((unsigned int) (c3 ^ 0x80) << 6)
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| 121 | | (unsigned int) (c4 ^ 0x80));
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| 122 |
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| 123 | if (FITS_IN_CHAR_TYPE (wc))
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| 124 | {
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| 125 | if (pwc != NULL)
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| 126 | *pwc = wc;
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| 127 | res = 4;
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| 128 | goto success;
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| 129 | }
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| 130 | }
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| 131 | }
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| 132 | }
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| 133 | }
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| 134 | }
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| 135 | }
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| 136 | }
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| 137 | }
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| 138 | goto invalid;
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