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83 lines
1.3 KiB
C
83 lines
1.3 KiB
C
/*
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* bitset.h - Bit sets
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*
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* Copyright 2012 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef BITSET_H
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#define BITSET_H
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#include <stdint.h>
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#include "bitset.h"
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struct bitset {
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uint64_t v;
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};
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static inline void bitset_zero(struct bitset *b)
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{
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b->v = 0;
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}
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static inline void bitset_set(struct bitset *b, int n)
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{
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b->v |= (uint64_t) 1 << n;
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}
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static inline void bitset_clear(struct bitset *b, int n)
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{
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b->v &= ~((uint64_t) 1 << n);
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}
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static inline int bitset_get(const struct bitset *b, int n)
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{
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return !!(b->v & ((uint64_t) 1 << n));
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}
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static inline int bitset_empty(const struct bitset *b)
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{
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return !b->v;
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}
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static inline int bitset_first(const struct bitset *b)
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{
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int i;
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for (i = 0; i != sizeof(b->v)*8; i++)
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if (b->v & ((uint64_t) 1 << i))
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return i;
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return -1;
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}
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static inline int bitset_last(const struct bitset *b)
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{
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int i = sizeof(b->v)*8;
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while (--i)
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if (b->v & ((uint64_t) 1 << i))
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break;
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return i;
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}
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static inline int bitset_common(const struct bitset *a, const struct bitset *b)
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{
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return (a->v & b->v) != 0;
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}
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#endif /* !BITSET_H */
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