usr/src/old/lib2648/mat.c

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char sccsid[] = "@(#)mat.c       5.1 (Berkeley) %G%";
#endif not lint

/*
 * mat: retrieve the value in m[r, c].
 * rows and cols are the size of the matrix in all these routines.
 */

#include "bit.h"

int
mat(m, rows, cols, r, c)
register bitmat m;
register int c;
int rows, cols, r;
{
        register int thisbyte;

        thisbyte = m[r*((cols+7)>>3) + (c>>3)] & 0xff;
        thisbyte &= 0x80 >> (c&7);
        return (thisbyte != 0);
}