28 lines
506 B
C
28 lines
506 B
C
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/* $NetBSD: netof.c,v 1.1.1.1 2000/03/29 12:38:50 simonb Exp $ */
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/*
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* netof - return the net address part of an ip address
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* (zero out host part)
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*/
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#include <stdio.h>
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#include "ntp_fp.h"
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#include "ntp_stdlib.h"
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u_int32
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netof(
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u_int32 num
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)
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{
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register u_int32 netnum;
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netnum = num;
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if(IN_CLASSC(netnum))
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netnum &= IN_CLASSC_NET;
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else if (IN_CLASSB(netnum))
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netnum &= IN_CLASSB_NET;
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else /* treat all other like class A */
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netnum &= IN_CLASSA_NET;
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return netnum;
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}
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