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/****************************************************************/
/* Name: noctrl() */
/* Desc: captures interrput 9 so as to ignore ctrl-c,ctrl-break,*/
/* ctrl-alt-del */
/****************************************************************/
#include <dos.h>
#if defined(__ZTC__)
#define INTERRUPT
#define FAR _far
#define ENABLE int_on
#define INPORTB inp
#define OUTPORTB outp
#else
#include <conio.h>
#if defined(__TURBOC__)
#define INTERRUPT interrupt
#define FAR far
#define ENABLE enable
#define INPORTB inportb
#define OUTPORTB outportb
#else
#define INTERRUPT _interrupt
#define FAR _far
#define ENABLE _enable
#define INPORTB inp
#define OUTPORTB outp
#endif
#endif
extern void (INTERRUPT FAR *oldint9)(void); /* Caller must set this */
void INTERRUPT FAR noctrl(void)
{
unsigned char byte;
static int flag;
ENABLE();
if ((byte = (unsigned char)INPORTB(0x60)) == 29)
flag = 1;
if (byte == 157)
flag = 0;
if (!flag)
(*oldint9)();
else switch (byte)
{
case 46 : /* yeah, these should be #defined! */
case 70 :
case 56 :
case 83 :
byte = (unsigned char)INPORTB(0x61);
OUTPORTB(0x61,byte | 0x80);
OUTPORTB(0x61,byte);
OUTPORTB(0x20,0x20);
break;
default :
(*oldint9)();
}
}
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