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Annotation of 43BSDReno/lib/libc/net/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: (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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