xref: /netbsd-src/external/bsd/libbind/dist/inet/inet_makeaddr.c (revision b5677b36047b601b9addaaa494a58ceae82c2a6c)
1 /*	$NetBSD: inet_makeaddr.c,v 1.1.1.1 2009/04/12 15:33:35 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. All advertising materials mentioning features or use of this software
16  *    must display the following acknowledgement:
17  *	This product includes software developed by the University of
18  *	California, Berkeley and its contributors.
19  * 4. Neither the name of the University nor the names of its contributors
20  *    may be used to endorse or promote products derived from this software
21  *    without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  */
35 
36 #if defined(LIBC_SCCS) && !defined(lint)
37 static const char sccsid[] = "@(#)inet_makeaddr.c	8.1 (Berkeley) 6/4/93";
38 #endif /* LIBC_SCCS and not lint */
39 
40 #include "port_before.h"
41 
42 #include <sys/param.h>
43 #include <netinet/in.h>
44 #include <arpa/inet.h>
45 
46 #include "port_after.h"
47 
48 /*%
49  * Formulate an Internet address from network + host.  Used in
50  * building addresses stored in the ifnet structure.
51  */
52 struct in_addr
inet_makeaddr(net,host)53 inet_makeaddr(net, host)
54 	u_long net, host;
55 {
56 	struct in_addr a;
57 
58 	if (net < 128U)
59 		a.s_addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST);
60 	else if (net < 65536U)
61 		a.s_addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);
62 	else if (net < 16777216L)
63 		a.s_addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);
64 	else
65 		a.s_addr = net | host;
66 	a.s_addr = htonl(a.s_addr);
67 	return (a);
68 }
69 
70 /*! \file */
71