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Annotation of 43BSDTahoe/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.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #if defined(LIBC_SCCS) && !defined(lint)
        !            19: static char sccsid[] = "@(#)inet_netof.c       5.5 (Berkeley) 6/27/88";
        !            20: #endif /* LIBC_SCCS and not lint */
        !            21: 
        !            22: #include <sys/types.h>
        !            23: #include <netinet/in.h>
        !            24: 
        !            25: /*
        !            26:  * Return the network number from an internet
        !            27:  * address; handles class a/b/c network #'s.
        !            28:  */
        !            29: u_long
        !            30: inet_netof(in)
        !            31:        struct in_addr in;
        !            32: {
        !            33:        register u_long i = ntohl(in.s_addr);
        !            34: 
        !            35:        if (IN_CLASSA(i))
        !            36:                return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
        !            37:        else if (IN_CLASSB(i))
        !            38:                return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
        !            39:        else
        !            40:                return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
        !            41: }

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