usr/src/lib/libbc/libc/inet/inet_makeaddr.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2001 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*
  28  * University Copyright- Copyright (c) 1982, 1986, 1988
  29  * The Regents of the University of California
  30  * All Rights Reserved
  31  *
  32  * University Acknowledgment- Portions of this document are derived from
  33  * software developed by the University of California, Berkeley, and its
  34  * contributors.
  35  */
  36
  37 #pragma ident   "%Z%%M% %I%     %E% SMI"
  38           /* from UCB 4.4 85/06/02 */
  39
  40 #include <sys/types.h>
  41 #include <netinet/in.h>
  42
  43 /*
  44  * Formulate an Internet address from network + host.  Used in
  45  * building addresses stored in the ifnet structure.
  46  */
  47 struct in_addr
  48 inet_makeaddr(net, host)
  49         int net, host;
  50 {
  51         ulong_t addr;
  52         struct in_addr inaddr;
  53
  54         if (net < 128)
  55                 addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST);
  56         else if (net < 65536)
  57                 addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);
  58         else
  59                 addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);
  60         inaddr.s_addr = htonl(addr);
  61         return (inaddr);
  62 }