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