novfx1.c

#include <stdio.h>
#include <stdarg.h>
#include <dos.h>
#include <i86.h>
#include <conio.h>
#include "vfx1.h"

extern unsigned _psp;
unsigned __far *psp_pointer;
unsigned _get_memsize();

void (__interrupt __far *prev_mouse_handler)();


void debug(const char *format, ...) {
	int i = 0;
	char buffer[256];
	va_list args;
	va_start(args, format);
	vsprintf(buffer, format, args);
	while(buffer[i] != '\0') {
		outp(0xE9, buffer[i]);
		i++;
	}
	va_end(args);
}

void __interrupt __far sense_hander(union INTPACK regs) {
	

	if(regs.h.ah < MIN_SENSE_FUNCTION || regs.h.ah > MAX_SENSE_FUNCTION) {
		_chain_intr(prev_mouse_handler);
	}
	switch(regs.h.al) {
		case SENSE_DRIVER_STATUS:
			regs.h.al = regs.h.ah;
			regs.h.ah = SENSE_DRIVER_STATUS;
			break;
		case GET_DEVICE_DATA:
			// TODO: Look at device class
			// Note that yaw/pitch/roll may not have standard meanings, review documentation.
			regs.x.bx = 0; // Yaw
			regs.x.cx = 0; // Pitch
			regs.x.dx = 0; // Roll
			regs.h.al = 0; // Buttons
	}
}


void transient() {}

int main(void) {
	outp(0xE9, 'A'<<8);
	outp(0xE9, '\r'<<8);
	outp(0xE9, '\n'<<8);
	outp(0xE9, '\0');
    //debug("Hello, world!\n");
	prev_mouse_handler = _dos_getvect(SENSE_VECTOR);
	printf("prev_mouse_handler = %p", prev_mouse_handler);
	flushall();
	_dos_setvect(SENSE_VECTOR, sense_hander);
    _dos_keep(0, _get_memsize());
    return 0;
}

unsigned _get_memsize()
{
   psp_pointer = (int far *) (_psp << 16); /* Get segment of the PSP*/
   return(psp_pointer[1] - _psp); /* Amount of memory to stay resident */
}