/*  CNTRL_C.C ** Control-C handler within the  program.  
      -- R.D. Allen, 11/12/87
*/
#include  <stdio.h>
#include  <stdlib.h>
#include  <dos.h>

#include  <wfc.h>

#include  "pt.h"

int Dev_hndl;

/********
*   Name:      CNTRL_C
*    Use:      Handled the control-C problem with MS-DOS. Each time
               this function is called it tells the driver to send
               a control-C character.   This function should be passed 
               to the CTRLBRK function in the TURBO.C library.
*   Input:     void         
*  Output:     returns 0 only if Dev_hndl is zero.
********/

int cntrl_c(void)
{
     if(Dev_hndl)  {

            /*  Go  to the trouble of eating  the  ^C displayed */
          _AH = 3;
          _BH = 0;
          geninterrupt(0x10);
          _AH = 2;
          _DH -= 1;
          geninterrupt(0x10);
          _AX = 0xa20;
          _CX = 2;
          geninterrupt (0x10);
          _AH = 2;
          _BH = 0;
          _DX = 0;
          geninterrupt(0x10);

          computc(Dev_hndl,  3);

            /*  Pass  the  control-c  to  the driver   */
     }
     return(Dev_hndl);
}    

/********
*   Name:  FH_SAVE
*    Use:  File handle save. This function saves the file handle for 
*         of the device driver.  This makes it accessible to  
CNTRL_C 
*          handler.
*  Input:  int fh;  -- File Handle of device driver
* Output:  void
********/

void fh_save(int fh)
{
     Dev hndl = fh;
}