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#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "bitset.h"
#include "buffer.h"
#define BITSET_BITS \
( CHAR_BIT * sizeof(size_t) )
#define BITSET_MASK(pos) \
( ((size_t)1) << ((pos) % BITSET_BITS) )
#define BITSET_WORD(set, pos) \
( (set)->bits[(pos) / BITSET_BITS] )
#define BITSET_USED(nbits) \
( ((nbits) + (BITSET_BITS - 1)) / BITSET_BITS )
bitset *bitset_init(size_t nbits) {
bitset *set;
set = malloc(sizeof(*set));
assert(set);
set->bits = calloc(BITSET_USED(nbits), sizeof(*set->bits));
set->nbits = nbits;
assert(set->bits);
return set;
}
void bitset_reset(bitset *set) {
memset(set->bits, 0, BITSET_USED(set->nbits) * sizeof(*set->bits));
}
void bitset_free(bitset *set) {
free(set->bits);
free(set);
}
void bitset_clear_bit(bitset *set, size_t pos) {
if (pos >= set->nbits) {
SEGFAULT();
}
BITSET_WORD(set, pos) &= ~BITSET_MASK(pos);
}
void bitset_set_bit(bitset *set, size_t pos) {
if (pos >= set->nbits) {
SEGFAULT();
}
BITSET_WORD(set, pos) |= BITSET_MASK(pos);
}
int bitset_test_bit(bitset *set, size_t pos) {
if (pos >= set->nbits) {
SEGFAULT();
}
return (BITSET_WORD(set, pos) & BITSET_MASK(pos)) != 0;
}
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