/*
 * Copyright (C) 2001 Sistina Software (UK) Limited.
 *
 * This file is released under the GPL.
 */

#ifndef _LVM_BITSET_H
#define _LVM_BITSET_H

#include "lvm-types.h"
#include "pool.h"

#include <limits.h>
#include <string.h>


typedef uint32_t *bitset_t;

bitset_t bitset_create(struct pool *mem, unsigned num_bits);

void bit_union(bitset_t out, bitset_t in1, bitset_t in2);
int bit_get_first(bitset_t bs);
int bit_get_next(bitset_t bs, int last_bit);


#define BITS_PER_INT (sizeof(int) * CHAR_BIT)

#define bit(bs, i) \
   (bs[(i / BITS_PER_INT) + 1] & (0x1 << (i & (BITS_PER_INT - 1))))

#define bit_set(bs, i) \
   (bs[(i / BITS_PER_INT) + 1] |= (0x1 << (i & (BITS_PER_INT - 1))))

#define bit_clear(bs, i) \
   (bs[(i / BITS_PER_INT) + 1] &= ~(0x1 << (i & (BITS_PER_INT - 1))))

#define bit_set_all(bs) \
   memset(bs + 1, -1, ((*bs / BITS_PER_INT) + 1) * sizeof(int))

#define bit_clear_all(bs) \
   memset(bs + 1, 0, ((*bs / BITS_PER_INT) + 1) * sizeof(int))

#define bit_copy(bs1, bs2) \
   memcpy(bs1 + 1, bs2 + 1, ((*bs1 / BITS_PER_INT) + 1) * sizeof(int))

#endif