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set.c
67 lines (53 loc) · 1.63 KB
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set.c
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/*
+----------------------------------------------------------------------+
| Copyright (c) 1997-2015 Derick Rethans |
+----------------------------------------------------------------------+
| This source file is subject to the 2-Clause BSD license which is |
| available through the LICENSE file, or online at |
| http://opensource.org/licenses/bsd-license.php |
+----------------------------------------------------------------------+
| Authors: Derick Rethans <derick@derickrethans.nl> |
+----------------------------------------------------------------------+
*/
/* $Id: set.c,v 1.1 2006-09-26 09:40:26 derick Exp $ */
#include <stdlib.h>
#include <math.h>
#include "set.h"
vld_set *vld_set_create(unsigned int size)
{
vld_set *tmp;
tmp = calloc(1, sizeof(vld_set));
tmp->size = size;
size = ceil((size + 7) / 8);
tmp->setinfo = calloc(1, size);
return tmp;
}
void vld_set_free(vld_set *set)
{
free(set->setinfo);
free(set);
}
void vld_set_add(vld_set *set, unsigned int position)
{
unsigned char *byte;
unsigned int bit;
byte = &(set->setinfo[position / 8]);
bit = position % 8;
*byte = *byte | 1 << bit;
}
void vld_set_remove(vld_set *set, unsigned int position)
{
unsigned char *byte;
unsigned int bit;
byte = &(set->setinfo[position / 8]);
bit = position % 8;
*byte = *byte & ~(1 << bit);
}
int vld_set_in_ex(vld_set *set, unsigned int position, int noisy)
{
unsigned char *byte;
unsigned int bit;
byte = &(set->setinfo[position / 8]);
bit = position % 8;
return (*byte & (1 << bit));
}