xref: /xsrc/external/mit/libXi/dist/src/XGMotion.c

/************************************************************

Copyright 1989, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
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in this Software without prior written authorization from The Open Group.

Copyright 1989 by Hewlett-Packard Company, Palo Alto, California.

			All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of Hewlett-Packard not be
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********************************************************/

/***********************************************************************
 *
 * XGetDeviceMotionEvents - Get the motion history of an input device.
 *
 */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <X11/extensions/XI.h>
#include <X11/extensions/XIproto.h>
#include <X11/Xlibint.h>
#include <X11/extensions/XInput.h>
#include <X11/extensions/extutil.h>
#include "XIint.h"
#include <limits.h>

XDeviceTimeCoord *
XGetDeviceMotionEvents(
    register Display	*dpy,
    XDevice		*dev,
    Time		 start,
    Time		 stop,
    int			*nEvents,
    int			*mode,
    int			*axis_count)
{
    xGetDeviceMotionEventsReq *req;
    xGetDeviceMotionEventsReply rep;
    XDeviceTimeCoord *tc;
    int *data, *bufp, *readp, *savp;
    unsigned long size;
    int i, j;
    XExtDisplayInfo *info = XInput_find_display(dpy);

    LockDisplay(dpy);
    if (_XiCheckExtInit(dpy, XInput_Initial_Release, info) == -1)
        return NULL;

    GetReq(GetDeviceMotionEvents, req);
    req->reqType = info->codes->major_opcode;
    req->ReqType = X_GetDeviceMotionEvents;
    req->start = start;
    req->stop = stop;
    req->deviceid = dev->device_id;

    if (!_XReply(dpy, (xReply *) & rep, 0, xFalse)) {
	UnlockDisplay(dpy);
	SyncHandle();
	*nEvents = 0;
	return (NULL);
    }

    *mode = rep.mode;
    *axis_count = rep.axes;
    *nEvents = rep.nEvents;
    if (!rep.nEvents) {
	UnlockDisplay(dpy);
	SyncHandle();
	return (NULL);
    }
    if (rep.length < (INT_MAX >> 2)) {
	size = rep.length << 2;
	savp = readp = Xmalloc(size);
    } else {
	size = 0;
	savp = readp = NULL;
    }
    /* rep.axes is a CARD8, so assume max number of axes for bounds check */
    if (rep.nEvents <
	(INT_MAX / (sizeof(XDeviceTimeCoord) + (UCHAR_MAX * sizeof(int)))) &&
	rep.nEvents * (rep.axes + 1) <= rep.length) {
	size_t bsize = rep.nEvents *
	    (sizeof(XDeviceTimeCoord) + (rep.axes * sizeof(int)));
	bufp = Xmalloc(bsize);
    } else
	bufp = NULL;
    if (!bufp || !savp) {
	Xfree(bufp);
	Xfree(savp);
	*nEvents = 0;
	_XEatDataWords(dpy, rep.length);
	UnlockDisplay(dpy);
	SyncHandle();
	return (NULL);
    }
    _XRead(dpy, (char *)readp, size);

    tc = (XDeviceTimeCoord *) bufp;
    data = (int *)(tc + rep.nEvents);
    for (i = 0; i < *nEvents; i++, tc++) {
	tc->time = *readp++;
	tc->data = data;
	for (j = 0; j < *axis_count; j++)
	    *data++ = *readp++;
    }
    XFree((char *)savp);
    UnlockDisplay(dpy);
    SyncHandle();
    return ((XDeviceTimeCoord *) bufp);
}

void
XFreeDeviceMotionEvents(XDeviceTimeCoord *events)
{
    XFree((char *)events);
}