10Sstevel@tonic-gate /*
20Sstevel@tonic-gate * Copyright (c) 1983, 1993
30Sstevel@tonic-gate * The Regents of the University of California. All rights reserved.
40Sstevel@tonic-gate *
50Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without
60Sstevel@tonic-gate * modification, are permitted provided that the following conditions
70Sstevel@tonic-gate * are met:
80Sstevel@tonic-gate * 1. Redistributions of source code must retain the above copyright
90Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer.
100Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright
110Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the
120Sstevel@tonic-gate * documentation and/or other materials provided with the distribution.
130Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this software
140Sstevel@tonic-gate * must display the following acknowledgement:
150Sstevel@tonic-gate * This product includes software developed by the University of
160Sstevel@tonic-gate * California, Berkeley and its contributors.
170Sstevel@tonic-gate * 4. Neither the name of the University nor the names of its contributors
180Sstevel@tonic-gate * may be used to endorse or promote products derived from this software
190Sstevel@tonic-gate * without specific prior written permission.
200Sstevel@tonic-gate *
210Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
220Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
230Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
240Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
250Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
260Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
270Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
280Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
290Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
300Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
310Sstevel@tonic-gate * SUCH DAMAGE.
320Sstevel@tonic-gate */
330Sstevel@tonic-gate
340Sstevel@tonic-gate #if defined(LIBC_SCCS) && !defined(lint)
350Sstevel@tonic-gate static const char sccsid[] = "@(#)inet_netof.c 8.1 (Berkeley) 6/4/93";
360Sstevel@tonic-gate #endif /* LIBC_SCCS and not lint */
370Sstevel@tonic-gate
380Sstevel@tonic-gate #include "port_before.h"
390Sstevel@tonic-gate
400Sstevel@tonic-gate #include <sys/param.h>
410Sstevel@tonic-gate #include <netinet/in.h>
420Sstevel@tonic-gate #include <arpa/inet.h>
430Sstevel@tonic-gate
440Sstevel@tonic-gate #include "port_after.h"
450Sstevel@tonic-gate
46*11038SRao.Shoaib@Sun.COM /*%
470Sstevel@tonic-gate * Return the network number from an internet
480Sstevel@tonic-gate * address; handles class a/b/c network #'s.
490Sstevel@tonic-gate */
500Sstevel@tonic-gate u_long
inet_netof(in)510Sstevel@tonic-gate inet_netof(in)
520Sstevel@tonic-gate struct in_addr in;
530Sstevel@tonic-gate {
540Sstevel@tonic-gate register u_long i = ntohl(in.s_addr);
550Sstevel@tonic-gate
560Sstevel@tonic-gate if (IN_CLASSA(i))
570Sstevel@tonic-gate return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
580Sstevel@tonic-gate else if (IN_CLASSB(i))
590Sstevel@tonic-gate return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
600Sstevel@tonic-gate else
610Sstevel@tonic-gate return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
620Sstevel@tonic-gate }
63*11038SRao.Shoaib@Sun.COM
64*11038SRao.Shoaib@Sun.COM /*! \file */
65