1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 "port_before.h"
33
34 #include <sys/param.h>
35 #include <netinet/in.h>
36 #include <arpa/inet.h>
37
38 #include "port_after.h"
39
40 /*%
41 * Formulate an Internet address from network + host. Used in
42 * building addresses stored in the ifnet structure.
43 */
44 struct in_addr
inet_makeaddr(in_addr_t net,in_addr_t host)45 inet_makeaddr(in_addr_t net, in_addr_t host)
46 {
47 struct in_addr a;
48
49 if (net < 128U)
50 a.s_addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST);
51 else if (net < 65536U)
52 a.s_addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);
53 else if (net < 16777216L)
54 a.s_addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);
55 else
56 a.s_addr = net | host;
57 a.s_addr = htonl(a.s_addr);
58 return (a);
59 }
60
61 /*
62 * Weak aliases for applications that use certain private entry points,
63 * and fail to include <arpa/inet.h>.
64 */
65 #undef inet_makeaddr
66 __weak_reference(__inet_makeaddr, inet_makeaddr);
67
68 /*! \file */
69