#include <stdio.h>
#include <windows.h>
#include <conio.h>
#include "ppt.h"

int validPpt; 

int GetValidPpt(void)
{
	// search for valid parallel port
	_outp(LPT1, 0x55);
	if((int)_inp(LPT1) == 0x55)
	    return LPT1;
	
	_outp(LPT2, 0x55);
	if((int)_inp(LPT2) == 0x55)
	    return LPT2;
	
	_outp(LPT3, 0x55);
	if((int)_inp(LPT3) == 0x55)
	    return LPT3;
	
	return 0;	
}

#define ECP_ECR		    (0x402)
#define ECR_STANDARD	    (0x0)
#define ECR_DISnERRORINT    (0x10)
#define ECR_DISDMA	    (0x0)
#define ECR_DISSVCINT	    (0x4)

void SetPptCompMode(void)
{
    //configure the parallel port at the compatibility mode.
    _outp(validPpt+ECP_ECR,ECR_STANDARD | ECR_DISnERRORINT | ECR_DISDMA | ECR_DISSVCINT);
}

int InstallGiveIo(void)
{
    HANDLE h;
    OSVERSIONINFO osvi;
    
    osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
    GetVersionEx(&osvi);
	
    if(osvi.dwPlatformId == VER_PLATFORM_WIN32_NT)
    {
	//OS=NT/2000
	h = CreateFile("\\\\.\\giveio", GENERIC_READ, 0, NULL,
			OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
	CloseHandle(h);
	if(h == INVALID_HANDLE_VALUE)
    	    return 0;
	else
	    return 0x2000;
    }
    else
    {	//OS=WIN98
	return 0x0098;
    }
}