1 /* 2 * Copyright (c) 1997-2000 by Sun Microsystems, Inc. 3 * All rights reserved. 4 */ 5 6 /* 7 * Copyright (c) 1983, 1993 8 * The Regents of the University of California. All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #pragma ident "%Z%%M% %I% %E% SMI" 40 41 #if defined(LIBC_SCCS) && !defined(lint) 42 static const char sccsid[] = "@(#)inet_netof.c 8.1 (Berkeley) 6/4/93"; 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "port_before.h" 46 47 #include <sys/param.h> 48 #include <netinet/in.h> 49 #include <arpa/inet.h> 50 51 #include "port_after.h" 52 53 /* 54 * Return the network number from an internet 55 * address; handles class a/b/c network #'s. 56 */ 57 #ifdef ORIGINAL_ISC_CODE 58 u_long 59 #else 60 in_addr_t 61 #endif 62 inet_netof(in) 63 struct in_addr in; 64 { 65 #ifdef ORIGINAL_ISC_CODE 66 register u_long i = ntohl(in.s_addr); 67 #else 68 register in_addr_t i = ntohl(in.s_addr); 69 #endif 70 71 if (IN_CLASSA(i)) 72 return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT); 73 else if (IN_CLASSB(i)) 74 return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT); 75 else 76 return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT); 77 } 78