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/* Search character in piece of UTF-8 string.
Copyright (C) 1999, 2002, 2006-2007 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2002.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "unistr.h"
uint8_t *
u8_chr (const uint8_t *s, size_t n, ucs4_t uc)
{
uint8_t c[6];
if (uc < 0x80)
{
uint8_t c0 = uc;
for (; n > 0; s++, n--)
{
if (*s == c0)
return (uint8_t *) s;
}
}
else
switch (u8_uctomb_aux (c, uc, 6))
{
case 2:
if (n > 1)
{
uint8_t c0 = c[0];
uint8_t c1 = c[1];
for (n--; n > 0; s++, n--)
{
if (*s == c0 && s[1] == c1)
return (uint8_t *) s;
}
}
break;
case 3:
if (n > 2)
{
uint8_t c0 = c[0];
uint8_t c1 = c[1];
uint8_t c2 = c[2];
for (n -= 2; n > 0; s++, n--)
{
if (*s == c0 && s[1] == c1 && s[2] == c2)
return (uint8_t *) s;
}
}
break;
case 4:
if (n > 3)
{
uint8_t c0 = c[0];
uint8_t c1 = c[1];
uint8_t c2 = c[2];
uint8_t c3 = c[3];
for (n -= 3; n > 0; s++, n--)
{
if (*s == c0 && s[1] == c1 && s[2] == c2 && s[3] == c3)
return (uint8_t *) s;
}
}
break;
}
return NULL;
}
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