48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/* ELLE - Copyright 1985, 1987 by Ken Harrenstien, SRI International
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* This software is quasi-public; it may be used freely with
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* like software, but may NOT be sold or made part of licensed
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* products without permission of the author.
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*/
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/*
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* EEBIT Bit Array functions
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*/
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#include "sb.h"
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/* Char-bit array functions. All assume that there are at least 8 bits
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* in a byte, and that the number of bytes per word is a power of 2.
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*/
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/* CHBBITS represents log 2 of the # of bits stored per chbit-array word.
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* WDBITS already has log2 of the # of bytes per word, and we are
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* assuming each byte has at least 8 bits, so log2(8) = 3.
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*/
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#define CHBSIZE (WDSIZE*8) /* # bits per word */
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#define CHBBITS (WDBITS+3) /* log2(CHBSIZE) */
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#define CHBMASK (CHBSIZE-1)
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#define CHBARYSIZ (128/CHBSIZE) /* # words per ASCII array */
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/* CHBALLOC(size) - Allocates a char-bit array */
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int *
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chballoc(size)
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int size;
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{ return((int *)calloc((size + CHBSIZE-1)/CHBSIZE, (sizeof(int))));
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}
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/* CHBIT(array, char) - Tests bit in char-bit array
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*/
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chbit(array,c)
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register int *array, c;
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{ return(array[c >> CHBBITS] & (1 << (c & CHBMASK)));
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}
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/* CHBIS (array, char) - Sets bit in char-bit array
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*/
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chbis(array,c)
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register int *array, c;
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{ array[c >> CHBBITS] |= (1 << (c & CHBMASK));
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}
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/* CHBIC (array, char) - Clears bit in char-bit array
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*/
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chbic(array,c)
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register int *array, c;
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{ array[c >> CHBBITS] &= ~(1 << (c & CHBMASK));
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}
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