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
__weak_alias(inet_makeaddr,_inet_makeaddr)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