usr/src/usr.bin/pascal/libpc/IN.c

/*-
 * Copyright (c) 1979 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)IN.c        1.3 (Berkeley) %G%";
#endif /* not lint */

#include "h00vars.h"

bool
IN(element, lower, upper, setptr)

        long    element;        /* element to check */
        long    lower;          /* lowest element of set */
        long    upper;          /* upper - lower of set */
        char    setptr[];       /* pointer to set */
{
        register int    indx;

        if ((indx = element - lower) < 0 || indx > upper)
                return FALSE;
        if (setptr[indx >> LG2BITSBYTE] & (1 << (indx & MSKBITSBYTE)))
                return TRUE;
        return FALSE;
}