54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/***************************************************************************
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* Copyright 1995, Technion, Israel Institute of Technology
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* Electrical Eng, Software Lab.
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* Author: Michael Veksler.
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***************************************************************************
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* File: bit_array.h
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* Purpose : manipulate array of bits,
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* Important: operations may be considered atomic.
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*
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***************************************************************************
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*/
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#ifndef __WINE_BIT_ARRAY_H
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#define __WINE_BIT_ARRAY_H
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#define BITS_PER_BYTE (8)
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#define BITS_PER_INT (sizeof(int)*BITS_PER_BYTE) /* must be power of 2 */
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#define BYTE_LOG2 (3)
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#if defined(INT_LOG2)
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/* nothing to do, IN_LOG2 is ok */
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#elif defined(__i386__)
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# define INT_LOG2 (5)
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#else
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# error "Can't find log2 of BITS_PER_INT, please code it manualy"
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#endif
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typedef struct bit_array {
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int bits; /* number of bits in the array */
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unsigned int *array; /* Actual array data (Never NULL) */
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} bit_array ;
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bit_array *AssembleArray(bit_array *new_array, unsigned int *buff, int bits);
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int ResetArray(bit_array *bits);
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/* Return index of first free bit, or -1 on failure */
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int VacantBit(bit_array *bits);
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/* Return the value of bit 'i' */
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int SampleBit(bit_array *bits, int i);
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/* Assign 'val' to a bit no. 'i'. Return: old bit's value */
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int AssignBit(bit_array *bits, int i, int val);
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/*
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** Allocate a free bit (==0) and make it used (==1).
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** Return: allocated bit index, or -1 on failure.
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*/
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int AllocateBit(bit_array *bits);
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#endif /* __WINE_BIT_ARRAY_H */
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