add FD_SET for 4.2BSD sites

[unix-history] / usr / src / lib / libc / net / inet_makeaddr.c

/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)inet_makeaddr.c     5.1 (Berkeley) %G%";
#endif LIBC_SCCS and not lint

#include <sys/types.h>
#include <netinet/in.h>

/*
* Formulate an Internet address from network + host.  Used in
* building addresses stored in the ifnet structure.
*/
struct in_addr
inet_makeaddr(net, host)
       int net, host;
{
       u_long addr;

       if (net < 128)
               addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST);
       else if (net < 65536)
               addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);
       else
               addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);
       addr = htonl(addr);
       return (*(struct in_addr *)&addr);
}