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Annotation of 42BSD/lib/libc/inet/inet_netof.c, revision 1.1.1.1

1.1       root        1: /*     inet_netof.c    4.3     82/11/14        */
                      2: 
                      3: #include <sys/types.h>
                      4: #include <netinet/in.h>
                      5: 
                      6: /*
                      7:  * Return the network number from an internet
                      8:  * address; handles class a/b/c network #'s.
                      9:  */
                     10: inet_netof(in)
                     11:        struct in_addr in;
                     12: {
                     13:        register u_long i = ntohl(in.s_addr);
                     14: 
                     15:        if (IN_CLASSA(i))
                     16:                return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
                     17:        else if (IN_CLASSB(i))
                     18:                return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
                     19:        else
                     20:                return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
                     21: }

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