43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/*
|
|
* Copyright (c) 1983 Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms are permitted
|
|
* provided that the above copyright notice and this paragraph are
|
|
* duplicated in all such forms and that any documentation,
|
|
* advertising materials, and other materials related to such
|
|
* distribution and use acknowledge that the software was developed
|
|
* by the University of California, Berkeley. The name of the
|
|
* University may not be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char sccsid[] = "@(#)inet_lnaof.c 5.5 (Berkeley) 6/27/88";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include <sys/types.h>
|
|
#include <netinet/in.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);
|
|
}
|