121369Sdist /* 221369Sdist * Copyright (c) 1983 Regents of the University of California. 333676Sbostic * All rights reserved. 433676Sbostic * 5*42626Sbostic * %sccs.include.redist.c% 621369Sdist */ 78360Ssam 826614Sdonn #if defined(LIBC_SCCS) && !defined(lint) 9*42626Sbostic static char sccsid[] = "@(#)inet_netof.c 5.6 (Berkeley) 06/01/90"; 1033676Sbostic #endif /* LIBC_SCCS and not lint */ 1121369Sdist 128360Ssam #include <sys/types.h> 139192Ssam #include <netinet/in.h> 148360Ssam 158360Ssam /* 168360Ssam * Return the network number from an internet 178360Ssam * address; handles class a/b/c network #'s. 188360Ssam */ 1932317Sbostic u_long 208370Ssam inet_netof(in) 218360Ssam struct in_addr in; 228360Ssam { 239192Ssam register u_long i = ntohl(in.s_addr); 248360Ssam 259192Ssam if (IN_CLASSA(i)) 269192Ssam return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT); 279192Ssam else if (IN_CLASSB(i)) 289192Ssam return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT); 299192Ssam else 309192Ssam return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT); 318360Ssam } 32