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47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
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/*
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* Copyright (C) 2001 Sistina Software (UK) Limited.
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*
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* This file is released under the GPL.
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*/
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#ifndef _LVM_BITSET_H
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#define _LVM_BITSET_H
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#include "lvm-types.h"
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#include "pool.h"
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#include <limits.h>
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#include <string.h>
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typedef uint32_t *bitset_t;
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bitset_t bitset_create(struct pool *mem, unsigned num_bits);
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void bit_union(bitset_t out, bitset_t in1, bitset_t in2);
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int bit_get_first(bitset_t bs);
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int bit_get_next(bitset_t bs, int last_bit);
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#define BITS_PER_INT (sizeof(int) * CHAR_BIT)
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#define bit(bs, i) \
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(bs[(i / BITS_PER_INT) + 1] & (0x1 << (i & (BITS_PER_INT - 1))))
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#define bit_set(bs, i) \
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(bs[(i / BITS_PER_INT) + 1] |= (0x1 << (i & (BITS_PER_INT - 1))))
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#define bit_clear(bs, i) \
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(bs[(i / BITS_PER_INT) + 1] &= ~(0x1 << (i & (BITS_PER_INT - 1))))
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#define bit_set_all(bs) \
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memset(bs + 1, -1, ((*bs / BITS_PER_INT) + 1) * sizeof(int))
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#define bit_clear_all(bs) \
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memset(bs + 1, 0, ((*bs / BITS_PER_INT) + 1) * sizeof(int))
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#define bit_copy(bs1, bs2) \
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memcpy(bs1 + 1, bs2 + 1, ((*bs1 / BITS_PER_INT) + 1) * sizeof(int))
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#endif
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