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sortix--sortix/libc/string/memrchr.cpp

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2014-06-14 10:11:37 -04:00
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2014.
This file is part of the Sortix C Library.
The Sortix C Library 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.
The Sortix C Library 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 the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
string/memrchr.cpp
Scans memory in reverse directory for a character.
*******************************************************************************/
#include <stdint.h>
#include <string.h>
extern "C" void* memrchr(const void* ptr, int c, size_t n)
{
const unsigned char* buf = (const unsigned char*) ptr;
for ( size_t i = n; i != 0; i-- )
if ( buf[i-1] == (unsigned char) c )
return (void*) (buf + i-1);
return NULL;
}