1*b5677b36Schristos /* $NetBSD: inet_netof.c,v 1.1.1.1 2009/04/12 15:33:35 christos Exp $ */
2*b5677b36Schristos
3*b5677b36Schristos /*
4*b5677b36Schristos * Copyright (c) 1983, 1993
5*b5677b36Schristos * The Regents of the University of California. All rights reserved.
6*b5677b36Schristos *
7*b5677b36Schristos * Redistribution and use in source and binary forms, with or without
8*b5677b36Schristos * modification, are permitted provided that the following conditions
9*b5677b36Schristos * are met:
10*b5677b36Schristos * 1. Redistributions of source code must retain the above copyright
11*b5677b36Schristos * notice, this list of conditions and the following disclaimer.
12*b5677b36Schristos * 2. Redistributions in binary form must reproduce the above copyright
13*b5677b36Schristos * notice, this list of conditions and the following disclaimer in the
14*b5677b36Schristos * documentation and/or other materials provided with the distribution.
15*b5677b36Schristos * 3. All advertising materials mentioning features or use of this software
16*b5677b36Schristos * must display the following acknowledgement:
17*b5677b36Schristos * This product includes software developed by the University of
18*b5677b36Schristos * California, Berkeley and its contributors.
19*b5677b36Schristos * 4. Neither the name of the University nor the names of its contributors
20*b5677b36Schristos * may be used to endorse or promote products derived from this software
21*b5677b36Schristos * without specific prior written permission.
22*b5677b36Schristos *
23*b5677b36Schristos * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24*b5677b36Schristos * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25*b5677b36Schristos * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26*b5677b36Schristos * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27*b5677b36Schristos * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28*b5677b36Schristos * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29*b5677b36Schristos * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30*b5677b36Schristos * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31*b5677b36Schristos * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32*b5677b36Schristos * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33*b5677b36Schristos * SUCH DAMAGE.
34*b5677b36Schristos */
35*b5677b36Schristos
36*b5677b36Schristos #if defined(LIBC_SCCS) && !defined(lint)
37*b5677b36Schristos static const char sccsid[] = "@(#)inet_netof.c 8.1 (Berkeley) 6/4/93";
38*b5677b36Schristos #endif /* LIBC_SCCS and not lint */
39*b5677b36Schristos
40*b5677b36Schristos #include "port_before.h"
41*b5677b36Schristos
42*b5677b36Schristos #include <sys/param.h>
43*b5677b36Schristos #include <netinet/in.h>
44*b5677b36Schristos #include <arpa/inet.h>
45*b5677b36Schristos
46*b5677b36Schristos #include "port_after.h"
47*b5677b36Schristos
48*b5677b36Schristos /*%
49*b5677b36Schristos * Return the network number from an internet
50*b5677b36Schristos * address; handles class a/b/c network #'s.
51*b5677b36Schristos */
52*b5677b36Schristos u_long
inet_netof(in)53*b5677b36Schristos inet_netof(in)
54*b5677b36Schristos struct in_addr in;
55*b5677b36Schristos {
56*b5677b36Schristos register u_long i = ntohl(in.s_addr);
57*b5677b36Schristos
58*b5677b36Schristos if (IN_CLASSA(i))
59*b5677b36Schristos return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
60*b5677b36Schristos else if (IN_CLASSB(i))
61*b5677b36Schristos return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
62*b5677b36Schristos else
63*b5677b36Schristos return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
64*b5677b36Schristos }
65*b5677b36Schristos
66*b5677b36Schristos /*! \file */
67