usr/src/lib/libc/string/ffs.c

/*
 * Copyright (c) 1987 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ffs.c       5.1 (Berkeley) %G%";
#endif LIBC_SCCS and not lint

/*
 * ffs -- vax ffs instruction
 */
ffs(mask)
        register long mask;
{
        register int cnt;

        if (mask == 0)
                return(0);
        for (cnt = 1; !(mask & 1); cnt++)
                mask >>= 1;
        return(cnt);
}