/***********************************************************
* WindowMud - Window Mud Server                            *
* File:   Descriptor.cpp                                   *
* Usage:  Maintains a linked list of connection data       *
*                                                          *
* No warranty is given or implied.                         *
* There is no license associated with this code.           *
* There are no restrictions on the use of this code.       *
* This code may be used in any way the reader wishes.      *
* No credit or credits are given and none are required.    *
* The reader may take this code and claim they wrote it.   *
************************************************************/

/***********************************************************
* Includes                                                 *
************************************************************/

#include "stdafx.h"         // precompiled headers
#include "Descriptor.h"
// Server
#include "Dnode.h"
#include "Utility.h"

/***********************************************************
* Globals                                                  *
************************************************************/

extern Dnode   *pDnodeActor;
extern CString  ErrorMsg;

Dnode *pDnodeCursor;
Dnode *pDnodeHead;


/***********************************************************
 * Descriptor constructor                                  *
 ***********************************************************/

Descriptor::Descriptor()
{
}

/***********************************************************
 * Descriptor destructor                                   *
 ***********************************************************/

Descriptor::~Descriptor()
{
}

////////////////////////////////////////////////////////////
// Public functions static                                //
////////////////////////////////////////////////////////////

/***********************************************************
 * Append new connection to connection list                *
 ***********************************************************/

void Descriptor::AppendIt()
{
  pDnodeActor->pDnodePrev            = pDnodeHead->pDnodePrev;
  pDnodeHead->pDnodePrev->pDnodeNext = pDnodeActor;
  pDnodeHead->pDnodePrev             = pDnodeActor;
  pDnodeActor->pDnodeNext            = pDnodeHead;
}

/***********************************************************
 * Clear descriptor linked list                            *
 ***********************************************************/

void Descriptor::ClearDescriptor()
{
  delete pDnodeHead;
  pDnodeHead = NULL;
}

/***********************************************************
 * Delete connection from connection list and close socket *
 ***********************************************************/

bool Descriptor::DeleteNode()
{
  Dnode *pDnode;
  int    Result;

  if (!pDnodeCursor->DnodeFd)
  {
    return false;
  }
  // Close the socket (pg 70)
  Result = ::closesocket(pDnodeCursor->DnodeFd);
  if (Result != 0)
  { // Close socket failed
    ErrorMsg = "Descriptor::DeleteNode - Error: closesocket";
    Utility::BlowUp();
  }
  pDnodeActor = NULL;
  pDnode = pDnodeCursor->pDnodePrev;
  delete pDnodeCursor;
  pDnodeCursor = pDnode;
  return true;
}

/***********************************************************
 * End of Dnode list?                                      *
 ***********************************************************/

bool Descriptor::EndOfDnodeList()
{
  return pDnodeCursor->DnodeFd ? false : true; // Ternary operator
}

/***********************************************************
 * Get Dnode pointer                                       *
 ***********************************************************/

Dnode *Descriptor::GetDnode()
{
  return pDnodeCursor;
}

/***********************************************************
 * Initialize descriptor pointers                          *
 ***********************************************************/

void Descriptor::InitDescriptor()
{
  pDnodeHead              = new Dnode(0, "");
  pDnodeHead->pDnodeNext  = pDnodeHead;
  pDnodeHead->pDnodePrev  = pDnodeHead;
  pDnodeCursor            = pDnodeHead;
}

/***********************************************************
 * Set Dnode pointer to the first Dnode in the list        *
 ***********************************************************/

void Descriptor::SetpDnodeCursorFirst()
{
  pDnodeCursor = pDnodeHead->pDnodeNext;
}

/***********************************************************
 * Set Dnode pointer to the next Dnode in the list         *
 ***********************************************************/

void Descriptor::SetpDnodeCursorNext()
{
  pDnodeCursor = pDnodeCursor->pDnodeNext;
}

/***********************************************************
 * Set Dnode pointer to the previous Dnode in the list     *
 ***********************************************************/

void Descriptor::SetpDnodeCursorPrev()
{
  pDnodeCursor = pDnodeCursor->pDnodePrev;
}