138 lines
5.2 KiB
C
138 lines
5.2 KiB
C
/* Convert multibyte character to wide character.
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Copyright (C) 1999-2002, 2005-2023 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2008. */
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/* This file contains the part of the body of the mbrtowc and mbrtoc32 functions
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that handles the special case of the UTF-8 encoding. */
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/* Cf. unistr/u8-mbtouc.c. */
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unsigned char c = (unsigned char) p[0];
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if (c < 0x80)
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{
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if (pwc != NULL)
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*pwc = c;
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res = (c == 0 ? 0 : 1);
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goto success;
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}
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if (c >= 0xc2)
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{
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if (c < 0xe0)
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{
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if (m == 1)
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goto incomplete;
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else /* m >= 2 */
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{
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unsigned char c2 = (unsigned char) p[1];
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if ((c2 ^ 0x80) < 0x40)
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{
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if (pwc != NULL)
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*pwc = ((unsigned int) (c & 0x1f) << 6)
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| (unsigned int) (c2 ^ 0x80);
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res = 2;
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goto success;
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}
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}
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}
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else if (c < 0xf0)
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{
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if (m == 1)
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goto incomplete;
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else
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{
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unsigned char c2 = (unsigned char) p[1];
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if ((c2 ^ 0x80) < 0x40
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&& (c >= 0xe1 || c2 >= 0xa0)
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&& (c != 0xed || c2 < 0xa0))
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{
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if (m == 2)
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goto incomplete;
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else /* m >= 3 */
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{
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unsigned char c3 = (unsigned char) p[2];
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if ((c3 ^ 0x80) < 0x40)
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{
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unsigned int wc =
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(((unsigned int) (c & 0x0f) << 12)
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| ((unsigned int) (c2 ^ 0x80) << 6)
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| (unsigned int) (c3 ^ 0x80));
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if (FITS_IN_CHAR_TYPE (wc))
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{
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if (pwc != NULL)
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*pwc = wc;
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res = 3;
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goto success;
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}
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}
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}
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}
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}
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}
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else if (c <= 0xf4)
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{
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if (m == 1)
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goto incomplete;
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else
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{
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unsigned char c2 = (unsigned char) p[1];
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if ((c2 ^ 0x80) < 0x40
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&& (c >= 0xf1 || c2 >= 0x90)
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&& (c < 0xf4 || (/* c == 0xf4 && */ c2 < 0x90)))
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{
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if (m == 2)
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goto incomplete;
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else
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{
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unsigned char c3 = (unsigned char) p[2];
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if ((c3 ^ 0x80) < 0x40)
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{
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if (m == 3)
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goto incomplete;
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else /* m >= 4 */
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{
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unsigned char c4 = (unsigned char) p[3];
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if ((c4 ^ 0x80) < 0x40)
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{
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unsigned int wc =
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(((unsigned int) (c & 0x07) << 18)
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| ((unsigned int) (c2 ^ 0x80) << 12)
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| ((unsigned int) (c3 ^ 0x80) << 6)
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| (unsigned int) (c4 ^ 0x80));
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if (FITS_IN_CHAR_TYPE (wc))
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{
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if (pwc != NULL)
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*pwc = wc;
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res = 4;
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goto success;
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}
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}
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}
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}
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}
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}
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}
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}
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}
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goto invalid;
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