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Annotation of src/usr.bin/make/bit.h, Revision 1.4

1.4     ! millert     1: /*     $OpenBSD: bit.h,v 1.3 1996/06/26 05:36:25 deraadt Exp $ */
1.2       deraadt     2: /*     $NetBSD: bit.h,v 1.5 1995/11/08 02:30:53 christos Exp $ */
1.1       deraadt     3:
                      4: /*
                      5:  * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
                      6:  * Copyright (c) 1988, 1989 by Adam de Boor
                      7:  * Copyright (c) 1989 by Berkeley Softworks
                      8:  * All rights reserved.
                      9:  *
                     10:  * This code is derived from software contributed to Berkeley by
                     11:  * Adam de Boor.
                     12:  *
                     13:  * Redistribution and use in source and binary forms, with or without
                     14:  * modification, are permitted provided that the following conditions
                     15:  * are met:
                     16:  * 1. Redistributions of source code must retain the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer.
                     18:  * 2. Redistributions in binary form must reproduce the above copyright
                     19:  *    notice, this list of conditions and the following disclaimer in the
                     20:  *    documentation and/or other materials provided with the distribution.
                     21:  * 3. All advertising materials mentioning features or use of this software
                     22:  *    must display the following acknowledgement:
                     23:  *     This product includes software developed by the University of
                     24:  *     California, Berkeley and its contributors.
                     25:  * 4. Neither the name of the University nor the names of its contributors
                     26:  *    may be used to endorse or promote products derived from this software
                     27:  *    without specific prior written permission.
                     28:  *
                     29:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     30:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     31:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     32:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     33:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     34:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     35:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     36:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     37:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     38:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     39:  * SUCH DAMAGE.
                     40:  *
                     41:  *     from: @(#)bit.h 5.3 (Berkeley) 6/1/90
                     42:  */
                     43:
                     44: /*
                     45:  * bit.h --
                     46:  *
                     47:  *     Definition of macros for setting and clearing bits in an array
                     48:  *     of integers.
                     49:  *
                     50:  *     It is assumed that "int" is 32 bits wide.
                     51:  */
                     52:
                     53: #ifndef _BIT
                     54: #define _BIT
                     55:
                     56: #include "sprite.h"
                     57:
                     58: #define BIT_NUM_BITS_PER_INT   32
                     59: #define BIT_NUM_BITS_PER_BYTE  8
                     60:
                     61: #define Bit_NumInts(numBits)   \
                     62:        (((numBits)+BIT_NUM_BITS_PER_INT -1)/BIT_NUM_BITS_PER_INT)
                     63:
                     64: #define Bit_NumBytes(numBits)  \
                     65:        (Bit_NumInts(numBits) * sizeof(int))
                     66:
                     67: #define Bit_Alloc(numBits, bitArrayPtr)        \
1.2       deraadt    68:         bitArrayPtr = (int *) emalloc((unsigned)Bit_NumBytes(numBits)); \
1.1       deraadt    69:         Bit_Zero((numBits), (bitArrayPtr))
                     70:
                     71: #define Bit_Free(bitArrayPtr)  \
                     72:         free((char *)bitArrayPtr)
                     73:
                     74: #define Bit_Set(numBits, bitArrayPtr) \
                     75:        ((bitArrayPtr)[(numBits)/BIT_NUM_BITS_PER_INT] |= \
                     76:                                (1 << ((numBits) % BIT_NUM_BITS_PER_INT)))
                     77:
                     78: #define Bit_IsSet(numBits, bitArrayPtr) \
                     79:        ((bitArrayPtr)[(numBits)/BIT_NUM_BITS_PER_INT] & \
                     80:                                (1 << ((numBits) % BIT_NUM_BITS_PER_INT)))
                     81:
                     82: #define Bit_Clear(numBits, bitArrayPtr) \
                     83:        ((bitArrayPtr)[(numBits)/BIT_NUM_BITS_PER_INT] &= \
                     84:                                ~(1 << ((numBits) % BIT_NUM_BITS_PER_INT)))
                     85:
                     86: #define Bit_IsClear(numBits, bitArrayPtr) \
                     87:        (!(Bit_IsSet((numBits), (bitArrayPtr))))
                     88:
                     89: #define Bit_Copy(numBits, srcArrayPtr, destArrayPtr) \
                     90:        bcopy((char *)(srcArrayPtr), (char *)(destArrayPtr), \
                     91:                Bit_NumBytes(numBits))
                     92:
                     93: #define Bit_Zero(numBits, bitArrayPtr) \
                     94:        bzero((char *)(bitArrayPtr), Bit_NumBytes(numBits))
                     95:
                     96: extern int       Bit_FindFirstSet();
                     97: extern int       Bit_FindFirstClear();
                     98: extern Boolean   Bit_Intersect();
                     99: extern Boolean           Bit_Union();
                    100: extern Boolean           Bit_AnySet();
                    101: extern int       *Bit_Expand();
1.4     ! millert   102:
1.1       deraadt   103: #endif /* _BIT */