inet_lnaof.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/* from UCB 4.3 82/11/14 */
#include <sys/types.h>
#include <netinet/in.h>
/*
* Return the local network address portion of an
* internet address; handles class a/b/c network
* number formats.
*/
inet_lnaof(in)
struct in_addr in;
{
register u_long i = ntohl(in.s_addr);
if (IN_CLASSA(i))
return ((i)&IN_CLASSA_HOST);
else if (IN_CLASSB(i))
return ((i)&IN_CLASSB_HOST);
else
return ((i)&IN_CLASSC_HOST);
}