/* copdump.c */

#include <stdio.h>
#include <fcntl.h>
#include <sys/time.h>

#include "copuser.h"

#define MAX_SND_WND 256

static inline int bet_seq(
unsigned int sseq,
unsigned int tseq,
unsigned int lseq)
{
   if (sseq == lseq)
      return(0);

   if (sseq < lseq)
   {
      if ((sseq <= tseq) && (tseq < lseq))
         return(1);
      else
         return(0);
   }
   else
   {
      if ((sseq > tseq) && (tseq >= lseq))
         return(0);
      else
         return(1);
   }

}
static inline unsigned inc_seq(
unsigned char seq)
{
   seq = (seq + 1) % MAX_SND_WND;
   return(seq);
}


phdrlog_t logbuf[64 * 1024];
char codes[6] = {'R', 'T', 'X', 'Y', 'Z', 'A'};

main()
{
   int len;
   int uwin;
   int i;
   int lastack = 0;
   int basejif;

   phdrlog_t *loc = logbuf;

   len = read(0, logbuf, sizeof(logbuf));
   basejif = loc->jiffies;

   len /= sizeof(phdrlog_t);

   printf("Op CP - Seq Ack Win - nxs nxa nxr \n");
   for (i = 0; i < len; i++)
   {

      printf("%c  %2d - %3d %3d %3d - %3d %3d %3d - %3d -  %6d",
              codes[loc->op],
              loc->cpuid,
              loc->seq,
              loc->ack,
              loc->win,
              loc->nxtsnd,
              loc->nxtack,
              loc->nxtrcv,
              lastack,
              loc->jiffies - basejif);

      if (loc->op == 0)   // Recv..
      {
         if (!bet_seq(lastack, loc->ack, inc_seq(loc->nxtsnd)))
         {
               printf("ZZZ");
         }
         else if (loc->ack != lastack)
         {
            lastack = loc->ack;
            if (loc->nxtsnd < loc->ack)
               loc->nxtsnd += 256;
            uwin = loc->win - (loc->nxtsnd - loc->ack);
            if (uwin < 0)
               printf("XXX");
         }

      }
      printf("\n");
      loc += 1;
   }
}