contrib/ntp/libntp/netof.c

   1 /*
   2  * netof - return the net address part of an ip address
   3  *         (zero out host part)
   4  */
   5 #include <stdio.h>
   6
   7 #include "ntp_fp.h"
   8 #include "ntp_stdlib.h"
   9
  10 u_int32
  11 netof(
  12         u_int32 num
  13         )
  14 {
  15         register u_int32 netnum;
  16
  17         netnum = num;
  18         if(IN_CLASSC(netnum))
  19             netnum &= IN_CLASSC_NET;
  20         else if (IN_CLASSB(netnum))
  21             netnum &= IN_CLASSB_NET;
  22         else                    /* treat all other like class A */
  23             netnum &= IN_CLASSA_NET;
  24         return netnum;
  25 }