/*	$OpenBSD: bit.h,v 1.5 1998/12/05 00:06:27 espie Exp $	*/
/*	$NetBSD: bit.h,v 1.5 1995/11/08 02:30:53 christos Exp $	*/

/*
 * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
 * Copyright (c) 1988, 1989 by Adam de Boor
 * Copyright (c) 1989 by Berkeley Softworks
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Adam de Boor.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	from: @(#)bit.h	5.3 (Berkeley) 6/1/90
 */

/*
 * bit.h --
 *
 *	Definition of macros for setting and clearing bits in an array
 *	of integers.
 *
 *	It is assumed that "int" is 32 bits wide.
 */

#ifndef _BIT
#define _BIT

#include "sprite.h"

#define BIT_NUM_BITS_PER_INT	32
#define BIT_NUM_BITS_PER_BYTE	8

#define Bit_NumInts(numBits)	\
	(((numBits)+BIT_NUM_BITS_PER_INT -1)/BIT_NUM_BITS_PER_INT)

#define Bit_NumBytes(numBits)	\
	(Bit_NumInts(numBits) * sizeof(int))

#define Bit_Alloc(numBits, bitArrayPtr)  	\
        bitArrayPtr = (int *) emalloc((unsigned)Bit_NumBytes(numBits)); \
        Bit_Zero((numBits), (bitArrayPtr))

#define Bit_Free(bitArrayPtr)	\
        free((char *)bitArrayPtr)

#define Bit_Set(numBits, bitArrayPtr) \
	((bitArrayPtr)[(numBits)/BIT_NUM_BITS_PER_INT] |= \
				(1 << ((numBits) % BIT_NUM_BITS_PER_INT)))

#define Bit_IsSet(numBits, bitArrayPtr) \
	((bitArrayPtr)[(numBits)/BIT_NUM_BITS_PER_INT] & \
				(1 << ((numBits) % BIT_NUM_BITS_PER_INT)))

#define Bit_Clear(numBits, bitArrayPtr) \
	((bitArrayPtr)[(numBits)/BIT_NUM_BITS_PER_INT] &= \
				~(1 << ((numBits) % BIT_NUM_BITS_PER_INT)))

#define Bit_IsClear(numBits, bitArrayPtr) \
	(!(Bit_IsSet((numBits), (bitArrayPtr))))

#define Bit_Copy(numBits, srcArrayPtr, destArrayPtr) \
	memmove((char *)(destArrayPtr), (char *)(srcArrayPtr), \
		Bit_NumBytes(numBits))

#define Bit_Zero(numBits, bitArrayPtr) \
	memset((char *)(bitArrayPtr), 0, Bit_NumBytes(numBits))

extern int	  Bit_FindFirstSet();
extern int	  Bit_FindFirstClear();
extern Boolean	  Bit_Intersect();
extern Boolean 	  Bit_Union();
extern Boolean 	  Bit_AnySet();
extern int  	  *Bit_Expand();

#endif /* _BIT */
