4.3BSD-UWisc/src/lib/libc/inet/inet_lnaof.c

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#if defined(LIBC_RCS) && !defined(lint)
static char rcs_id[] =
	"$Header: inet_lnaof.c,v 1.2 86/09/08 14:46:21 tadl Exp $";
#endif
/*
 * RCS info
 *	$Locker:  $
 */
/*
 * Copyright (c) 1983 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[] = "@(#)inet_lnaof.c	5.2 (Berkeley) 3/9/86";
#endif LIBC_SCCS and not lint

#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);
}