initial import
[glibc.git] / inet / inet_netof.c
blobd6de694243d12258dea11c1e11caab0cc15fe065
1 /*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid[] = "@(#)inet_netof.c 8.1 (Berkeley) 6/4/93";
36 #endif /* LIBC_SCCS and not lint */
38 #include <sys/param.h>
39 #include <netinet/in.h>
40 #include <arpa/inet.h>
43 * Return the network number from an internet
44 * address; handles class a/b/c network #'s.
46 u_long
47 inet_netof(in)
48 struct in_addr in;
50 register u_long i = ntohl(in.s_addr);
52 if (IN_CLASSA(i))
53 return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
54 else if (IN_CLASSB(i))
55 return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
56 else
57 return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);