139 lines
5.1 KiB
C
139 lines
5.1 KiB
C
|
/* Convert multibyte character to wide character.
|
||
|
|
Copyright (C) 1999-2002, 2005-2021 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
This program is free software: you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU General Public License as published by
|
||
|
|
the Free Software Foundation; either version 3 of the License, or
|
||
|
|
(at your option) any later version.
|
||
|
|
|
||
|
|
This program is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
GNU General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU General Public License
|
||
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
/* Written by Bruno Haible <bruno@clisp.org>, 2008. */
|
||
|
|
|
||
|
|
/* This file contains the part of the body of the mbrtowc and mbrtoc32 functions
|
||
|
|
that handles the special case of the UTF-8 encoding. */
|
||
|
|
|
||
|
|
/* Cf. unistr/u8-mbtouc.c. */
|
||
|
|
unsigned char c = (unsigned char) p[0];
|
||
|
|
|
||
|
|
if (c < 0x80)
|
||
|
|
{
|
||
|
|
if (pwc != NULL)
|
||
|
|
*pwc = c;
|
||
|
|
res = (c == 0 ? 0 : 1);
|
||
|
|
goto success;
|
||
|
|
}
|
||
|
|
if (c >= 0xc2)
|
||
|
|
{
|
||
|
|
if (c < 0xe0)
|
||
|
|
{
|
||
|
|
if (m == 1)
|
||
|
|
goto incomplete;
|
||
|
|
else /* m >= 2 */
|
||
|
|
{
|
||
|
|
unsigned char c2 = (unsigned char) p[1];
|
||
|
|
|
||
|
|
if ((c2 ^ 0x80) < 0x40)
|
||
|
|
{
|
||
|
|
if (pwc != NULL)
|
||
|
|
*pwc = ((unsigned int) (c & 0x1f) << 6)
|
||
|
|
| (unsigned int) (c2 ^ 0x80);
|
||
|
|
res = 2;
|
||
|
|
goto success;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else if (c < 0xf0)
|
||
|
|
{
|
||
|
|
if (m == 1)
|
||
|
|
goto incomplete;
|
||
|
|
else
|
||
|
|
{
|
||
|
|
unsigned char c2 = (unsigned char) p[1];
|
||
|
|
|
||
|
|
if ((c2 ^ 0x80) < 0x40
|
||
|
|
&& (c >= 0xe1 || c2 >= 0xa0)
|
||
|
|
&& (c != 0xed || c2 < 0xa0))
|
||
|
|
{
|
||
|
|
if (m == 2)
|
||
|
|
goto incomplete;
|
||
|
|
else /* m >= 3 */
|
||
|
|
{
|
||
|
|
unsigned char c3 = (unsigned char) p[2];
|
||
|
|
|
||
|
|
if ((c3 ^ 0x80) < 0x40)
|
||
|
|
{
|
||
|
|
unsigned int wc =
|
||
|
|
(((unsigned int) (c & 0x0f) << 12)
|
||
|
|
| ((unsigned int) (c2 ^ 0x80) << 6)
|
||
|
|
| (unsigned int) (c3 ^ 0x80));
|
||
|
|
|
||
|
|
if (FITS_IN_CHAR_TYPE (wc))
|
||
|
|
{
|
||
|
|
if (pwc != NULL)
|
||
|
|
*pwc = wc;
|
||
|
|
res = 3;
|
||
|
|
goto success;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else if (c <= 0xf4)
|
||
|
|
{
|
||
|
|
if (m == 1)
|
||
|
|
goto incomplete;
|
||
|
|
else
|
||
|
|
{
|
||
|
|
unsigned char c2 = (unsigned char) p[1];
|
||
|
|
|
||
|
|
if ((c2 ^ 0x80) < 0x40
|
||
|
|
&& (c >= 0xf1 || c2 >= 0x90)
|
||
|
|
&& (c < 0xf4 || (c == 0xf4 && c2 < 0x90)))
|
||
|
|
{
|
||
|
|
if (m == 2)
|
||
|
|
goto incomplete;
|
||
|
|
else
|
||
|
|
{
|
||
|
|
unsigned char c3 = (unsigned char) p[2];
|
||
|
|
|
||
|
|
if ((c3 ^ 0x80) < 0x40)
|
||
|
|
{
|
||
|
|
if (m == 3)
|
||
|
|
goto incomplete;
|
||
|
|
else /* m >= 4 */
|
||
|
|
{
|
||
|
|
unsigned char c4 = (unsigned char) p[3];
|
||
|
|
|
||
|
|
if ((c4 ^ 0x80) < 0x40)
|
||
|
|
{
|
||
|
|
unsigned int wc =
|
||
|
|
(((unsigned int) (c & 0x07) << 18)
|
||
|
|
| ((unsigned int) (c2 ^ 0x80) << 12)
|
||
|
|
| ((unsigned int) (c3 ^ 0x80) << 6)
|
||
|
|
| (unsigned int) (c4 ^ 0x80));
|
||
|
|
|
||
|
|
if (FITS_IN_CHAR_TYPE (wc))
|
||
|
|
{
|
||
|
|
if (pwc != NULL)
|
||
|
|
*pwc = wc;
|
||
|
|
res = 4;
|
||
|
|
goto success;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
goto invalid;
|