projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| e9ce8d39 | 1 | /* |
| 9385eb3d | 2 | * Copyright (c) 1983, 1993 |
| e9ce8d39 A |
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. | |
| e9ce8d39 A |
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 | ||
| 5b2abdfb | 30 | #if defined(LIBC_SCCS) && !defined(lint) |
| 34e8f829 | 31 | static const char sccsid[] = "@(#)inet_netof.c 8.1 (Berkeley) 6/4/93"; |
| 5b2abdfb | 32 | #endif /* LIBC_SCCS and not lint */ |
| 9385eb3d | 33 | #include <sys/cdefs.h> |
| 34e8f829 A |
34 | __FBSDID("$FreeBSD: src/lib/libc/inet/inet_netof.c,v 1.4 2007/06/03 17:20:26 ume Exp $"); |
| 35 | ||
| 36 | #include "port_before.h" | |
| e9ce8d39 | 37 | |
| 9385eb3d A |
38 | #include <sys/param.h> |
| 39 | #include <netinet/in.h> | |
| 40 | #include <arpa/inet.h> | |
| e9ce8d39 | 41 | |
| 34e8f829 A |
42 | #include "port_after.h" |
| 43 | ||
| 44 | /*% | |
| 9385eb3d A |
45 | * Return the network number from an internet |
| 46 | * address; handles class a/b/c network #'s. | |
| e9ce8d39 | 47 | */ |
| 9385eb3d A |
48 | in_addr_t |
| 49 | inet_netof(in) | |
| 50 | struct in_addr in; | |
| e9ce8d39 | 51 | { |
| 9385eb3d | 52 | in_addr_t i = ntohl(in.s_addr); |
| e9ce8d39 | 53 | |
| 9385eb3d A |
54 | if (IN_CLASSA(i)) |
| 55 | return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT); | |
| 56 | else if (IN_CLASSB(i)) | |
| 57 | return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT); | |
| 58 | else | |
| 59 | return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT); | |
| e9ce8d39 | 60 | } |
| 9385eb3d A |
61 | |
| 62 | /* | |
| 63 | * Weak aliases for applications that use certain private entry points, | |
| 64 | * and fail to include <arpa/inet.h>. | |
| 65 | */ | |
| 66 | #undef inet_netof | |
| 67 | __weak_reference(__inet_netof, inet_netof); | |
| 34e8f829 A |
68 | |
| 69 | /*! \file */ |