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