Function MkTemp

Libraries/unrar/filefn.cpp:324–356

#if 0
wchar *MkTemp(wchar *Name,size_t MaxSize)
{
  size_t Length=wcslen(Name);

  RarTime CurTime;
  CurTime.SetCurrentTime();

  // We cannot use CurTime.GetWin() as is, because its lowest bits can
  // have low informational value, like being a zero or few fixed numbers.
  uint Random=(uint)(CurTime.GetWin()/100000);

  // Using PID we guarantee that different RAR copies use different temp names
  // even if started in exactly the same time.
  uint PID=0;
#ifdef _WIN_ALL
  PID=(uint)GetCurrentProcessId();
#elif defined(_UNIX)
  PID=(uint)getpid();
#endif

  for (uint Attempt=0;;Attempt++)
  {
    uint Ext=Random%50000+Attempt;
    wchar RndText[50];
    swprintf(RndText,ASIZE(RndText),L"%u.%03u",PID,Ext);
    if (Length+wcslen(RndText)>=MaxSize || Attempt==1000)
      return NULL;
    wcsncpyz(Name+Length,RndText,MaxSize-Length);
    if (!FileExist(Name))
      break;
  }
  return Name;
}
#endif