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Annotation of 43BSDReno/lib/libc/net/inet_netof.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1983 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #if defined(LIBC_SCCS) && !defined(lint)
                     21: static char sccsid[] = "@(#)inet_netof.c       5.6 (Berkeley) 6/1/90";
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: #include <sys/types.h>
                     25: #include <netinet/in.h>
                     26: 
                     27: /*
                     28:  * Return the network number from an internet
                     29:  * address; handles class a/b/c network #'s.
                     30:  */
                     31: u_long
                     32: inet_netof(in)
                     33:        struct in_addr in;
                     34: {
                     35:        register u_long i = ntohl(in.s_addr);
                     36: 
                     37:        if (IN_CLASSA(i))
                     38:                return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
                     39:        else if (IN_CLASSB(i))
                     40:                return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
                     41:        else
                     42:                return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
                     43: }

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