#include "stdinc.h"
#include "SndWinBuf.h"

//
// Sender Window Buffer
//

// --| create sender window buffer |--
SndWinBuf::SndWinBuf (int w0) {
  w = w0;
  n = 0;
  lo = 0;
  buf = (Sbuf *) Calloc(w, sizeof(Sbuf));
  for (int i=0; i<w; i++) {
    buf[i].accept = NO;  buf[i].nTries = 0;
  }
}

// --| advance window until 1st slot needs a pkt |--
void
SndWinBuf::advWin (void) {
//printf ("  SndWinBuff::advWin: lo = %d, w = %d, buf[].empty = %d, buf[].accept = %d\n",
//				lo, w, buf[lo%w].empty, buf[lo%w].accept);
  while (buf[lo%w].accept == YES) {
    buf[lo%w].empty = YES;
    buf[lo%w].accept = NO;
    buf[lo%w].nTries = 0;
    ++lo;
    --n;
  }
}