#if defined(LIBC_RCS) && !defined(lint) static char rcs_id[] = "$Header: inet_netof.c,v 1.2 86/09/08 14:46:15 tadl Exp $"; #endif /* * RCS info * $Locker: $ */ /* * 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_netof.c 5.2 (Berkeley) 3/9/86"; #endif LIBC_SCCS and not lint #include <sys/types.h> #include <netinet/in.h> /* * Return the network number from an internet * address; handles class a/b/c network #'s. */ inet_netof(in) struct in_addr in; { register u_long i = ntohl(in.s_addr); if (IN_CLASSA(i)) return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT); else if (IN_CLASSB(i)) return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT); else return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT); }