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/* Look at first character in UTF-8 string, returning an error code.
Copyright (C) 1999-2002, 2006-2007, 2009-2020 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2001.
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/>. */
#include <config.h>
/* Specification. */
#include "unistr.h"
int
u8_mbtoucr (ucs4_t *puc, const uint8_t *s, size_t n)
{
uint8_t c = *s;
if (c < 0x80)
{
*puc = c;
return 1;
}
else if (c >= 0xc2)
{
if (c < 0xe0)
{
if (n >= 2)
{
if ((s[1] ^ 0x80) < 0x40)
{
*puc = ((unsigned int) (c & 0x1f) << 6)
| (unsigned int) (s[1] ^ 0x80);
return 2;
}
/* invalid multibyte character */
}
else
{
/* incomplete multibyte character */
*puc = 0xfffd;
return -2;
}
}
else if (c < 0xf0)
{
if (n >= 2)
{
if ((s[1] ^ 0x80) < 0x40
&& (c >= 0xe1 || s[1] >= 0xa0)
&& (c != 0xed || s[1] < 0xa0))
{
if (n >= 3)
{
if ((s[2] ^ 0x80) < 0x40)
{
*puc = ((unsigned int) (c & 0x0f) << 12)
| ((unsigned int) (s[1] ^ 0x80) << 6)
| (unsigned int) (s[2] ^ 0x80);
return 3;
}
/* invalid multibyte character */
}
else
{
/* incomplete multibyte character */
*puc = 0xfffd;
return -2;
}
}
/* invalid multibyte character */
}
else
{
/* incomplete multibyte character */
*puc = 0xfffd;
return -2;
}
}
else if (c < 0xf8)
{
if (n >= 2)
{
if ((s[1] ^ 0x80) < 0x40
&& (c >= 0xf1 || s[1] >= 0x90)
&& (c < 0xf4 || (c == 0xf4 && s[1] < 0x90)))
{
if (n >= 3)
{
if ((s[2] ^ 0x80) < 0x40)
{
if (n >= 4)
{
if ((s[3] ^ 0x80) < 0x40)
{
*puc = ((unsigned int) (c & 0x07) << 18)
| ((unsigned int) (s[1] ^ 0x80) << 12)
| ((unsigned int) (s[2] ^ 0x80) << 6)
| (unsigned int) (s[3] ^ 0x80);
return 4;
}
/* invalid multibyte character */
}
else
{
/* incomplete multibyte character */
*puc = 0xfffd;
return -2;
}
}
/* invalid multibyte character */
}
else
{
/* incomplete multibyte character */
*puc = 0xfffd;
return -2;
}
}
/* invalid multibyte character */
}
else
{
/* incomplete multibyte character */
*puc = 0xfffd;
return -2;
}
}
}
/* invalid multibyte character */
*puc = 0xfffd;
return -1;
}
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