#include "diskwipe.h"

struct MsgPort *NewPort()
{
   UBYTE sigbit;
   struct MsgPort *port;

   if ((sigbit = AllocSignal(-1)) == -1)
      return(NULL);

   if ((port = (struct MsgPort *)
               AllocMem((ULONG)sizeof(struct MsgPort),
                        MEMF_CLEAR|MEMF_PUBLIC)) == NULL)
      {
      FreeSignal(sigbit);
      return(NULL);
      }

   port->mp_Node.ln_Type = NT_MSGPORT;
   port->mp_Flags        = PA_SIGNAL;
   port->mp_SigBit       = sigbit;
   port->mp_SigTask      = FindTask(0);
   NewList(&(port->mp_MsgList));
   return(port);
}

void DisposePort(port)
struct MsgPort *port;
{
   FreeSignal(port->mp_SigBit);
   FreeMem((char *)port, (ULONG)sizeof(*port));
}

struct IOExtTD *CreateIOExtTD(mp)
struct MsgPort *mp;
   {
   struct IOExtTD *ioext;
   if ((ioext = (struct IOExtTD *)
                AllocMem(sizeof(struct IOExtTD),
                         MEMF_CLEAR|MEMF_PUBLIC)) != NULL)
      {
      ioext->iotd_Req.io_Message.mn_Node.ln_Type = NT_MESSAGE;
      ioext->iotd_Req.io_Message.mn_ReplyPort = mp;
      }
   return(ioext);
   }