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Annotation of 43BSD/lib/libc/inet/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.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  */
                      6: 
                      7: #if defined(LIBC_SCCS) && !defined(lint)
                      8: static char sccsid[] = "@(#)inet_netof.c       5.2 (Berkeley) 3/9/86";
                      9: #endif LIBC_SCCS and not lint
                     10: 
                     11: #include <sys/types.h>
                     12: #include <netinet/in.h>
                     13: 
                     14: /*
                     15:  * Return the network number from an internet
                     16:  * address; handles class a/b/c network #'s.
                     17:  */
                     18: inet_netof(in)
                     19:        struct in_addr in;
                     20: {
                     21:        register u_long i = ntohl(in.s_addr);
                     22: 
                     23:        if (IN_CLASSA(i))
                     24:                return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
                     25:        else if (IN_CLASSB(i))
                     26:                return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
                     27:        else
                     28:                return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
                     29: }

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