sortix--sortix/libc/stdlib/bsearch.cpp

/*******************************************************************************

    Copyright(C) Jonas 'Sortie' Termansen 2012.

    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/>.

    stdlib/bsearch.cpp
    Binary search.

*******************************************************************************/

#include <stdint.h>
#include <stdlib.h>

extern "C" void* bsearch(const void* key, const void* base, size_t nmemb,
                         size_t size, int (*compare)(const void*, const void*))
{
	const uint8_t* baseptr = (const uint8_t*) base;
	// TODO: Just a quick and surprisingly correct yet slow implementation.
	for ( size_t i = 0; i < nmemb; i++ )
	{
		const void* candidate = baseptr + i * size;
		if ( !compare(key, candidate) )
			return (void*) candidate;
	}
	return NULL;
}