no SCCS file; new copyright; att/bsd/shared

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

/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)inet_lnaof.c        5.7 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>

/*
* Return the local network address portion of an
* internet address; handles class a/b/c network
* number formats.
*/
u_long
inet_lnaof(in)
       struct in_addr in;
{
       register u_long i = ntohl(in.s_addr);

       if (IN_CLASSA(i))
               return ((i)&IN_CLASSA_HOST);
       else if (IN_CLASSB(i))
               return ((i)&IN_CLASSB_HOST);
       else
               return ((i)&IN_CLASSC_HOST);
}