84 lines
3.1 KiB
C
84 lines
3.1 KiB
C
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/* $XFree86$ */
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/*
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* This include file is designed to be a portable way for systems to define
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* bit field manipulation of arrays of bits.
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*/
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#ifndef __XTRAPBITS__
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#define __XTRAPBITS__ "@(#)xtrapbits.h 1.6 - 90/09/18 "
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/*****************************************************************************
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Copyright 1987, 1988, 1989, 1990, 1994 by Digital Equipment Corporation,
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Maynard, MA
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of Digital not be
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used in advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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*****************************************************************************/
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/*
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*
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* CONTRIBUTORS:
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*
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* Dick Annicchiarico
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* Robert Chesler
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* Dan Coutu
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* Gene Durso
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* Marc Evans
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* Alan Jamison
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* Mark Henry
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* Ken Miller
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*
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*/
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typedef unsigned char *UByteP; /* Pointer to an unsigned byte array */
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#define BitsInByte 8L /* The number of bits in a byte */
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#define BitInByte(bit) /* Returns the bit mask of a byte */ \
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(1L << (((bit) % BitsInByte)))
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#define BitInWord(bit) /* Returns the bit mask of a word */ \
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(1L << (((bit) % (BitsInByte * 2L))))
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#define BitInLong(bit) /* Returns the bit mask of a long */ \
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(1L << (((bit) % (BitsInByte * 4L))))
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#define ByteInArray(array,bit) /* Returns the byte offset to get to a bit */ \
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(((UByteP)(array))[(bit) / BitsInByte])
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#define BitIsTrue(array,bit) /* Test to see if a specific bit is True */ \
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(ByteInArray(array,bit) & BitInByte(bit))
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#define BitIsFalse(array,bit) /* Test to see if a specific bit is False */ \
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(!(BitIsTrue(array,bit)))
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#define BitTrue(array,bit) /* Set a specific bit to be True */ \
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(ByteInArray(array,bit) |= BitInByte(bit))
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#define BitFalse(array,bit) /* Set a specific bit to be False */ \
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(ByteInArray(array,bit) &= ~BitInByte(bit))
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#define BitToggle(array,bit) /* Toggle a specific bit */ \
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(ByteInArray(array,bit) ^= BitInByte(bit))
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#define BitCopy(dest,src,bit) /* Copy a specific bit */ \
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BitIsTrue((src),(bit)) ? BitTrue((dest),(bit)) : BitFalse((dest),(bit))
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#define BitValue(array,bit) /* Return True or False depending on bit */ \
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(BitIsTrue((array),(bit)) ? True : False)
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#define BitSet(array,bit,value) /* Set bit to given value in array */ \
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(value) ? BitTrue((array),(bit)) : BitFalse((array),(bit))
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#endif /* __XTRAPBITS__ */
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