xntpd/libntp/netof.c

	netof.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * Copyright (c) 1996 by Sun Microsystems, Inc.
 * All Rights Reserved.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*
 * netof - return the net address part of an ip address
 *         (zero out host part)
 */
#include <stdio.h>

#include "ntp_fp.h"
#include "ntp_stdlib.h"

u_int32
netof(num)
	u_int32 num;
{
	register u_int32 netnum;

	netnum = num;
	if(IN_CLASSC(netnum))
		netnum &= IN_CLASSC_NET;
	else if (IN_CLASSB(netnum))
		netnum &= IN_CLASSB_NET;
	else			/* treat all other like class A */
		netnum &= IN_CLASSA_NET;
	return netnum;
}