Category : C Source Code
Archive   : DRAWFN3S.ZIP
Filename : CTRL-BRK.C

 
Output of file : CTRL-BRK.C contained in archive : DRAWFN3S.ZIP
/*****************************************************************************
* Module to trap ctrl-brk/hardware error and handle them gracefully. *
* Note the usage of GraphGen.c module is assumed. *
* *
* Written by: Gershon Elber IBM PC Ver 1.0, Jan. 1989 *
*****************************************************************************/

#include
#include
#include
#include
#include "Ctrl-Brk.h"

static void far *OldCtrlBrk; /* Save here old int 1bh to be able to restore. */
static int WasCtrlBrkSetUp = FALSE; /* TRUE if SetUpCtrlBrk rtn was called. */
int WasCtrlBrk;

static void interrupt TrapCtrlBrk(void);
static int TrapCtrlC(void);

/*****************************************************************************
* Routine TrapCtrlBrk gain control if Control break was typed: *
*****************************************************************************/
static void interrupt TrapCtrlBrk(void)
{
WasCtrlBrk = TRUE;
}

/*****************************************************************************
* Routine TrapCtrlC gain control if Control C was typed (DOS level): *
*****************************************************************************/
static int TrapCtrlC(void)
{
WasCtrlBrk = TRUE;

return -1; /* Resume execution. */
}

/*****************************************************************************
* Routine SetUpCtrlBrk must be called once by main program: *
*****************************************************************************/
void SetUpCtrlBrk(void)
{
if (WasCtrlBrkSetUp) return; /* No need to to it twice! */

OldCtrlBrk = getvect(BIOS_CTRL_BRK);
setvect(BIOS_CTRL_BRK, TrapCtrlBrk);

ctrlbrk(TrapCtrlC);

WasCtrlBrkSetUp = TRUE;
}

/*****************************************************************************
* Routine RestoreCtrlBrk must be called before the program quit: *
*****************************************************************************/
void RestoreCtrlBrk(void)
{
if (WasCtrlBrkSetUp)
setvect(BIOS_CTRL_BRK, (void interrupt (*)()) OldCtrlBrk);

WasCtrlBrkSetUp = FALSE;
}

/*****************************************************************************
* Routine TrapHardWareError gain control if hardware fails - int 24. *
*****************************************************************************/
static int TrapHardWareError(int errval, int ax, int bp, int si)
{
return IGNORE;
}

/*****************************************************************************
* Routine SetUpHardError must be called once by main program: *
* harderr set interrupt vector 0x024 to point to TrapHardWareError. *
*****************************************************************************/
void SetUpHardErr(void)
{
harderr(TrapHardWareError);
}


  3 Responses to “Category : C Source Code
Archive   : DRAWFN3S.ZIP
Filename : CTRL-BRK.C
”

  1. Daniel says:
    January 27, 2013 at 3:59 pm

    Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. Joshie says:
    March 18, 2014 at 4:57 pm

    This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

  3. DiskingRound says:
    January 14, 2015 at 10:57 pm

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