bitvector.c

开放源码实时操作系统源码.

/***********************************************************************

bitvector.c - some routines for dealing with bitvectors

Copyright (C) 1991 Dean Rubine

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License. See ../COPYING for
the full agreement.

 **********************************************************************/

/*LINTLIBRARY*/

#include "util.h"
#undef	BITS_PER_VECTOR
#define BITS_PER_VECTOR	128
#include "bitvector.h"
/* ari -- for strlen */
#include <string.h>  

int
bitcount(max, bv)
int max;
BitVector bv;
{
	register int i, count;

	for(count = i = 0; i < max; i++)
		if(IS_SET(i, bv))
			count++;
	return count;
}

char *
BitVectorToString(max, bv)
BitVector bv;
{
	char *string = tempstring();
	register int i;

	for(i = 0; i < max; i++)
		string[i] = IS_SET(i, bv) ? (i % 10) + '0' : '-' ;
	string[i] = '\0';
	return string;
}


void
StringToBitVector(string, max, bv)
char *string;
int max;
BitVector bv;
{
	register int i;

/* ari -- strlen returns a size_t, which depends on which OS you've got */
	if((int) strlen(string) != max) {
		error("StringToBitVector: strlen(%s)=%d != %d",
			string, (int) strlen(string), max);
		return;
	    }

	for(i = 0; i < max; i++)
		if(string[i] != '-')
			BIT_SET(i, bv);
		else
			BIT_CLEAR(i, bv);		
}


void
SetBitVector(v)
register BitVector v;
{
	register int nints = INTS_PER_VECTOR;

	while(--nints >= 0)
		*v++ = -1;
}


void
ClearBitVector(nints, v)
register int nints;
register BitVector v;
{

	while(--nints >= 0)
		*v++ = 0;
}

void
AssignBitVector(nints, v1, v2)
register int nints;
register BitVector v1, v2;
{

	while(--nints >= 0)
		*v1++ = *v2++;
}

int
BitVectorDeQ(max, v)
register int max;
register BitVector v;
{
	register int i;
	for(i = 0; i < max; i++)
		if(IS_SET(i, v)) {
			BIT_CLEAR(i, v);
			return i;
		}
	return -1;

}

int *
BitVectorOr(v, v1, v2, ipv)
int *v;
register int *v1, *v2;
register int ipv;
{
	int *vv = v;
	do
		*vv++ = *v1++ | *v2++;
	while(--ipv > 0);
	return v;
}

int *
BitVectorAnd(v, v1, v2, ipv)
int *v;
register int *v1, *v2;
register int ipv;
{
	int *vv = v;
	do
		*vv++ = *v1++ & *v2++;
	while(--ipv > 0);
	return v;
}

int
BitVectorNoBitsSet(v, ipv)
register int *v;
register int ipv;
{
	do
		if(*v++) return 0;
	while(--ipv > 0);
	return 1;
}