transmission/libtransmission/history.c

/*
 * This file Copyright (C) Mnemosyne LLC
 *
 * This file is licensed by the GPL version 2. Works owned by the
 * Transmission project are granted a special exemption to clause 2 (b)
 * so that the bulk of its code can remain under the MIT license.
 * This exemption does not extend to derived works not owned by
 * the Transmission project.
 *
 * $Id$
 */

#include <assert.h>
#include <string.h> /* memset () */

#include "transmission.h"
#include "history.h"
#include "utils.h"

void
tr_historyAdd (tr_recentHistory * h, time_t now, unsigned int n)
{
  if (h->slices[h->newest].date == now)
    {
      h->slices[h->newest].n += n;
    }
  else
    {
      if (++h->newest == TR_RECENT_HISTORY_PERIOD_SEC)
        h->newest = 0;
      h->slices[h->newest].date = now;
      h->slices[h->newest].n = n;
    }
}

unsigned int
tr_historyGet (const tr_recentHistory * h, time_t now, unsigned int sec)
{
  unsigned int n = 0;
  const time_t cutoff = (now?now:tr_time ()) - sec;
  int i = h->newest;

  for (;;)
    {
      if (h->slices[i].date <= cutoff)
        break;

      n += h->slices[i].n;

      if (--i == -1)
        i = TR_RECENT_HISTORY_PERIOD_SEC - 1; /* circular history */

      if (i == h->newest)
        break; /* we've come all the way around */
    }

  return n;
}