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https://github.com/postgres/postgres.git
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Marc G. Fournier
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* bit.c--
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* Standard bit array code.
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/lib/Attic/bit.c,v 1.2 1996/10/31 10:26:27 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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/*
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* utils/memutils.h contains declarations of the functions in this file
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*/
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#include "postgres.h"
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#include "utils/memutils.h"
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void
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BitArraySetBit(BitArray bitArray, BitIndex bitIndex)
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{
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bitArray[bitIndex/BitsPerByte]
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|= (1 << (BitsPerByte - (bitIndex % BitsPerByte) - 1));
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return;
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}
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void
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BitArrayClearBit(BitArray bitArray, BitIndex bitIndex)
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{
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bitArray[bitIndex/BitsPerByte]
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&= ~(1 << (BitsPerByte - (bitIndex % BitsPerByte) - 1));
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return;
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}
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bool
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BitArrayBitIsSet(BitArray bitArray, BitIndex bitIndex)
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{
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return( (bool) (((bitArray[bitIndex / BitsPerByte] &
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(1 << (BitsPerByte - (bitIndex % BitsPerByte)
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- 1)
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)
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) != 0 ) ? 1 : 0) );
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}
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