/* * Copyright (c) 1999 Greg Haerr <greg@censoft.com> * * NULL Mouse Driver */#include <stdio.h>#include "device.h"#define	SCALE		3	/* default scaling factor for acceleration */#define	THRESH		5	/* default threshhold for acceleration */static int  	NUL_Open(MOUSEDEVICE *pmd);static void 	NUL_Close(void);static int  	NUL_GetButtonInfo(void);static void	NUL_GetDefaultAccel(int *pscale,int *pthresh);static int  	NUL_Read(MWCOORD *dx, MWCOORD *dy, MWCOORD *dz, int *bp);static int  	NUL_Poll(void);MOUSEDEVICE mousedev = {	NUL_Open,	NUL_Close,	NUL_GetButtonInfo,	NUL_GetDefaultAccel,	NUL_Read,	NUL_Poll};/* * Poll for events */static intNUL_Poll(void){  return 0;}/* * Open up the mouse device. */static intNUL_Open(MOUSEDEVICE *pmd){	return -2;	/* no mouse*/}/* * Close the mouse device. */static voidNUL_Close(void){}/* * Get mouse buttons supported */static intNUL_GetButtonInfo(void){	return 0;}/* * Get default mouse acceleration settings */static voidNUL_GetDefaultAccel(int *pscale,int *pthresh){	*pscale = SCALE;	*pthresh = THRESH;}/* * Attempt to read bytes from the mouse and interpret them. * Returns -1 on error, 0 if either no bytes were read or not enough * was read for a complete state, or 1 if the new state was read. * When a new state is read, the current buttons and x and y deltas * are returned.  This routine does not block. */static intNUL_Read(MWCOORD *dx, MWCOORD *dy, MWCOORD *dz, int *bp){	return 0;}