projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| bb0cfa24 DF |
1 | /* |
| 2 | * Copyright (c) 1983 Regents of the University of California. | |
| 3 | * All rights reserved. The Berkeley software License Agreement | |
| 4 | * specifies the terms and conditions for redistribution. | |
| 5 | */ | |
| 6 | ||
| 7 | #ifndef lint | |
| 8 | static char sccsid[] = "@(#)inet_lnaof.c 5.1 (Berkeley) %G%"; | |
| 9 | #endif not lint | |
| a6792f09 SL |
10 | |
| 11 | #include <sys/types.h> | |
| 056d5bbd | 12 | #include <netinet/in.h> |
| a6792f09 SL |
13 | |
| 14 | /* | |
| 15 | * Return the local network address portion of an | |
| 16 | * internet address; handles class a/b/c network | |
| 17 | * number formats. | |
| 18 | */ | |
| 3a3b7ace | 19 | inet_lnaof(in) |
| a6792f09 SL |
20 | struct in_addr in; |
| 21 | { | |
| 056d5bbd SL |
22 | register u_long i = ntohl(in.s_addr); |
| 23 | ||
| 24 | if (IN_CLASSA(i)) | |
| 25 | return ((i)&IN_CLASSA_HOST); | |
| 26 | else if (IN_CLASSB(i)) | |
| 27 | return ((i)&IN_CLASSB_HOST); | |
| 28 | else | |
| 29 | return ((i)&IN_CLASSC_HOST); | |
| a6792f09 | 30 | } |