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

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ffs.c       5.3 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

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

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