minix/lib/libc/inet/inet_makeaddr.c

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/* $NetBSD: inet_makeaddr.c,v 1.1 2004/05/20 23:13:02 christos Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)inet_makeaddr.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: inet_makeaddr.c,v 1.1 2004/05/20 23:13:02 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifdef __weak_alias
__weak_alias(inet_makeaddr,_inet_makeaddr)
#endif
/*
* Formulate an Internet address from network + host. Used in
* building addresses stored in the ifnet structure.
*/
struct in_addr
inet_makeaddr(in_addr_t net, in_addr_t host)
{
in_addr_t addr;
struct in_addr ret;
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;
ret.s_addr = htonl(addr);
return ret;
}