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  #include <sys/param.h>
      31  #include <netinet/in.h>
      32  #include <arpa/inet.h>
      33  
      34  /*
      35   * Formulate an Internet address from network + host.  Used in
      36   * building addresses stored in the ifnet structure.
      37   */
      38  struct in_addr
      39  __inet_makeaddr (in_addr_t net, in_addr_t host)
      40  {
      41  	struct in_addr in;
      42  
      43  	if (net < 128)
      44  		in.s_addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST);
      45  	else if (net < 65536)
      46  		in.s_addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);
      47  	else if (net < 16777216L)
      48  		in.s_addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);
      49  	else
      50  		in.s_addr = net | host;
      51  	in.s_addr = htonl(in.s_addr);
      52  	return in;
      53  }
      54  libc_hidden_def (__inet_makeaddr)
      55  weak_alias (__inet_makeaddr, inet_makeaddr)