net/FreeBSD/inet_makeaddr.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 static const char sccsid[] = "@(#)inet_makeaddr.c       8.1 (Berkeley) 6/4/93";
  32 #endif /* LIBC_SCCS and not lint */
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD: src/lib/libc/inet/inet_makeaddr.c,v 1.4 2007/06/03 17:20:26 ume Exp $");
  35
  36 #include "port_before.h"
  37
  38 #include <sys/param.h>
  39 #include <netinet/in.h>
  40 #include <arpa/inet.h>
  41
  42 #include "port_after.h"
  43
  44 /*%
  45  * Formulate an Internet address from network + host.  Used in
  46  * building addresses stored in the ifnet structure.
  47  */
  48 struct in_addr
  49 inet_makeaddr(net, host)
  50         in_addr_t net, host;
  51 {
  52         struct in_addr a;
  53
  54         if (net < 128U)
  55                 a.s_addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST);
  56         else if (net < 65536U)
  57                 a.s_addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);
  58         else if (net < 16777216L)
  59                 a.s_addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);
  60         else
  61                 a.s_addr = net | host;
  62         a.s_addr = htonl(a.s_addr);
  63         return (a);
  64 }
  65
  66 /*
  67  * Weak aliases for applications that use certain private entry points,
  68  * and fail to include <arpa/inet.h>.
  69  */
  70 #undef inet_makeaddr
  71 __weak_reference(__inet_makeaddr, inet_makeaddr);
  72
  73 /*! \file */