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