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Annotation of 43BSD/lib/libc/inet/inet_netof.c, revision 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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