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sortix--sortix/libc/bsearch.cpp
2012-12-14 14:13:36 +01:00

40 lines
1.4 KiB
C++

/*******************************************************************************
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/>.
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;
}