bring up to rev 6

[unix-history] / usr / src / lib / libc / net / inet_lnaof.c

/*
 * 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	5.3 (Berkeley) %G%";
#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.
 */
u_long
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);
}