/*
    MOUDEMO1.C --- Simple MS-DOS Demo of Mouse Driver
    Copyright (C) 1989 Ziff Davis Communications
    PC Magazine * Ray Duncan

    Compile:    CL MOUDEMO1.C

    Usage:      MOUDEMO1  (press both mouse buttons to exit)
*/

#include <stdio.h>
#include <dos.h>

union REGS regs;

void cls(void);                     /* function prototypes */
void gotoxy(int, int);
int  mopen(int *);
void mclose(int);
void mread(int, int *, int *, int *);
void mhide(int);
void munhide(int);

main(int argc, char *argv[])
{
    int x,y,buttons;                /* mouse state variables */
    int mhandle;                    /* mouse handle from mopen */

    if(! mopen(&mhandle))           /* exit if no mouse */
    {   
        printf("\nMouse not available\n");
        exit(1);
    }

    cls();                          /* clear the screen */  
    gotoxy(45,0);                   /* and show help info */
    puts("Press Both Mouse Buttons To Exit");

    munhide(mhandle);               /* make mouse cursor visible */
   
    do {                            /* read mouse position & buttons */
        mread(mhandle, &x, &y, &buttons);
        gotoxy(0,0);                /* display mouse status */
        printf("X = %3d  Y = %3d", x, y);
    }   while(buttons != 3);        /* exit if both buttons down */

    mhide(mhandle);                 /* hide mouse cursor */
    mclose(mhandle);                /* release mouse driver */
    cls();                          /* clear screen and exit */
}

/*
    Clear the screen and position cursor at (x,y) = (0,0)
*/
void cls(void)
{
    printf("\x01b[2J");
}

/*
    Position cursor to (x,y); ANSI driver uses 1-based coordinates.
*/
void gotoxy(int x, int y)
{
    printf("\x01b[%d;%dH",y+1,x+1);
}

/*
    Initialize mouse driver, return mouse status and handle.
    Status is true if mouse available, false if not.  Handle is
    dummy value in MS-DOS version.
*/
int mopen(int *handle)
{
    regs.x.ax = 0;                  /* function 0 = reset driver */
    int86(0x33, &regs, &regs);
    *handle = 0;                    /* set dummy mouse handle */
    return(regs.x.ax);              /* and return status */
}

/*
    Make mouse pointer visible. Mouse handle is dummy in MS-DOS version.
*/
void munhide(handle)
{
    regs.x.ax = 1;                  /* function 1 = display pointer */
    int86(0x33, &regs, &regs);
}

/*
    Hide mouse pointer.  Mouse handle is dummy in MS-DOS version.
*/
void mhide(handle)
{
    regs.x.ax = 2;                  /* function 2 = hide pointer */
    int86(0x33, &regs, &regs);
}

/*
    Read mouse position and button status.  Mouse handle is dummy
    in MS-DOS version.
*/
void mread(int handle, int *x, int *y, int *buttons)
{
    regs.x.ax = 3;                  /* function 3 = get position */    
    int86(0x33, &regs, &regs);      /* and button status */
    *buttons = regs.x.bx & 3;
    *x = regs.x.cx;
    *y = regs.x.dx;
}

/*
    Release mouse driver.  Mouse handle is dummy in MS-DOS version.
*/
void mclose(handle)
{
    regs.x.ax = 0;                  /* function 0 = reset driver */
    int86(0x33, &regs, &regs);
}