BSD 4_1_snap release

[unix-history] / usr / src / lib / libpc / IN.c

/* Copyright (c) 1979 Regents of the University of California */

static char sccsid[] = "@(#)IN.c 1.2 3/7/81";

#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;
}