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      1 /*	$NetBSD: inet_makeaddr.c,v 1.1 2004/05/20 23:13:02 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 #if 0
     35 static char sccsid[] = "@(#)inet_makeaddr.c	8.1 (Berkeley) 6/4/93";
     36 #else
     37 __RCSID("$NetBSD: inet_makeaddr.c,v 1.1 2004/05/20 23:13:02 christos Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #include "namespace.h"
     42 #include <sys/param.h>
     43 #include <netinet/in.h>
     44 #include <arpa/inet.h>
     45 
     46 #ifdef __weak_alias
     47 __weak_alias(inet_makeaddr,_inet_makeaddr)
     48 #endif
     49 
     50 /*
     51  * Formulate an Internet address from network + host.  Used in
     52  * building addresses stored in the ifnet structure.
     53  */
     54 struct in_addr
     55 inet_makeaddr(in_addr_t net, in_addr_t host)
     56 {
     57 	in_addr_t addr;
     58 	struct in_addr ret;
     59 
     60 	if (net < 128)
     61 		addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST);
     62 	else if (net < 65536)
     63 		addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);
     64 	else if (net < 16777216L)
     65 		addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);
     66 	else
     67 		addr = net | host;
     68 	ret.s_addr = htonl(addr);
     69 	return ret;
     70 }
     71