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52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
#ifndef __LIB_BIT_H__
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#define __LIB_BIT_H__
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/* Minimum excess needed for word alignment */
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#define SZ_WORD sizeof(unsigned int)
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#define WORD_BITS 32
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#define WORD_BITS_LOG2 5
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#define BITWISE_GETWORD(x) ((x) >> WORD_BITS_LOG2) /* Divide by 32 */
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#define BITWISE_GETBIT(x) (1 << ((x) % WORD_BITS))
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typedef unsigned int u32;
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unsigned int __clz(unsigned int bitvector);
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int find_and_set_first_free_bit(u32 *word, unsigned int lastbit);
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int check_and_clear_bit(u32 *word, int bit);
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int check_and_clear_contig_bits(u32 *word, int first, int nbits);
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int find_and_set_first_free_contig_bits(u32 *word, unsigned int limit,
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int nbits);
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/* Set */
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static inline void setbit(unsigned int *w, unsigned int flags)
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{
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*w |= flags;
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}
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/* Clear */
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static inline void clrbit(unsigned int *w, unsigned int flags)
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{
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*w &= ~flags;
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}
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/* Test */
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static inline int tstbit(unsigned int *w, unsigned int flags)
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{
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return *w & flags;
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}
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/* Test and clear */
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static inline int tstclr(unsigned int *w, unsigned int flags)
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{
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int res = tstbit(w, flags);
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clrbit(w, flags);
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return res;
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}
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#endif /* __LIB_BIT_H__ */
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