#include <stdio.h>
#include <ctype.h>
#include <string.h>

#define LINELEN 256
/* copyright 1989 - John D. Hays, KD7UW */
main(int argc,char *argv[])
{

   FILE *fi,*fo;
   char string[LINELEN-1];
   char addr[20],hname1[80],hname2[80];
   char *x,*y,*z;
   int cnt;

   fprintf(stderr,"COPYRIGHT 1989 - John D. Hays, KD7UW\n");
   if (argc != 3) 
   {
   fprintf(stderr,"Usage: %s input-hosts.net output-domain.txt\n\007",
      argv[0]);
   exit(0);
   }

   if ((fi=fopen(argv[1],"r")) != NULL)
   {
      fo = fopen(argv[2],"w");
      while (fgets(string,LINELEN,fi) != NULL)
      {
         
         y = strchr(string,'\n');
         *y = '\0';
         addr[0] = '\0';
         hname1[0] = '\0';
         hname2[0] = '\0';

         if ((string[0] == '#') || (strlen(string) < 3))
         {
         fprintf(fo,"%s\n",string);
         goto foo;
         }
         y = strchr(string,'#');
         if (y != NULL) 
         {
         fprintf(fo,"#%s\n",y);
         *y = '\0';
         }
         sscanf(string,"%s%s%s",addr,hname1,hname2);
         if (strchr(hname1,'.'))
         {
         x = hname1;
         z = hname2;
         }
         else
         {
         x = hname2;
         z = hname1;
         }
         if ((*x == '\0') || (*z == '\0'))
         {
         fprintf(fo,"%s.\tIN\tA\t%s\n",hname1,addr);
         }
         else
         {
         fprintf(fo,"%s.\tIN\tA\t%s\n",x,addr);
         fprintf(fo,"%s.\tIN\tCNAME\t%s.\n",z,x);
         }
foo:            fprintf(stderr,"%s\n",string);
      }
   }
}