date and time created 91/04/15 11:47:09 by donn

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

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)inet_makeaddr.c	5.6 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>

/*
 * Formulate an Internet address from network + host.  Used in
 * building addresses stored in the ifnet structure.
 */
struct in_addr
inet_makeaddr(net, host)
	u_long net, host;
{
	u_long addr;

	if (net < 128)
		addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST);
	else if (net < 65536)
		addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);
	else if (net < 16777216L)
		addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);
	else
		addr = net | host;
	addr = htonl(addr);
	return (*(struct in_addr *)&addr);
}