dist/Xi/grabdev.c

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

Copyright 1989, 1998  The Open Group

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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
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.

HEWLETT-PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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********************************************************/

/***********************************************************************
 *
 * Extension function to grab an extension device.
 *
 */

#define	 NEED_EVENTS
#define	 NEED_REPLIES
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#include "inputstr.h"	/* DeviceIntPtr      */
#include "windowstr.h"	/* window structure  */
#include <X11/extensions/XI.h>
#include <X11/extensions/XIproto.h>
#include "exglobals.h"
#include "dixevents.h"	/* GrabDevice */

#include "grabdev.h"

extern XExtEventInfo EventInfo[];
extern int ExtEventIndex;

/***********************************************************************
 *
 * Swap the request if the requestor has a different byte order than us.
 *
 */

int
SProcXGrabDevice(ClientPtr client)
{
    char n;

    REQUEST(xGrabDeviceReq);
    swaps(&stuff->length, n);
    REQUEST_AT_LEAST_SIZE(xGrabDeviceReq);
    swapl(&stuff->grabWindow, n);
    swapl(&stuff->time, n);
    swaps(&stuff->event_count, n);

    if (stuff->length != (sizeof(xGrabDeviceReq) >> 2) + stuff->event_count)
       return BadLength;

    SwapLongs((CARD32 *) (&stuff[1]), stuff->event_count);

    return (ProcXGrabDevice(client));
}

/***********************************************************************
 *
 * Grab an extension device.
 *
 */

int
ProcXGrabDevice(ClientPtr client)
{
    int rc;
    xGrabDeviceReply rep;
    DeviceIntPtr dev;
    struct tmask tmp[EMASKSIZE];

    REQUEST(xGrabDeviceReq);
    REQUEST_AT_LEAST_SIZE(xGrabDeviceReq);

    if (stuff->length != (sizeof(xGrabDeviceReq) >> 2) + stuff->event_count)
	return BadLength;

    rep.repType = X_Reply;
    rep.RepType = X_GrabDevice;
    rep.sequenceNumber = client->sequence;
    rep.length = 0;

    rc = dixLookupDevice(&dev, stuff->deviceid, client, DixGrabAccess);
    if (rc != Success)
	return rc;

    if ((rc = CreateMaskFromList(client, (XEventClass *) & stuff[1],
				 stuff->event_count, tmp, dev,
				 X_GrabDevice)) != Success)
	return rc;

    rc = GrabDevice(client, dev, stuff->this_device_mode,
		    stuff->other_devices_mode, stuff->grabWindow,
		    stuff->ownerEvents, stuff->time,
		    tmp[stuff->deviceid].mask, &rep.status, FALSE);

    if (rc != Success)
	return rc;

    WriteReplyToClient(client, sizeof(xGrabDeviceReply), &rep);
    return Success;
}

/***********************************************************************
 *
 * This procedure creates an event mask from a list of XEventClasses.
 *
 * Procedure is as follows:
 * An XEventClass is (deviceid << 8 | eventtype). For each entry in the list,
 * get the device. Then run through all available event indices (those are
 * set when XI starts up) and binary OR's the device's mask to whatever the
 * event mask for the given event type was.
 * If an error occurs, it is sent to the client. Errors are generated if
 *  - if the device given in the event classs is invalid
 *  - if the device in the class list is not the device given as parameter (no
 *  error if parameter is NULL)
 *
 * mask has to be size EMASKSIZE and pre-allocated.
 *
 * @param client The client to send the error to (if one occurs)
 * @param list List of event classes as sent from the client.
 * @param count Number of elements in list.
 * @param mask Preallocated mask (size EMASKSIZE).
 * @param dev The device we're creating masks for.
 * @param req The request we're processing. Used to fill in error fields.
 */

int
CreateMaskFromList(ClientPtr client, XEventClass * list, int count,
		   struct tmask *mask, DeviceIntPtr dev, int req)
{
    int rc, i, j;
    int device;
    DeviceIntPtr tdev;

    for (i = 0; i < EMASKSIZE; i++) {
	mask[i].mask = 0;
	mask[i].dev = NULL;
    }

    for (i = 0; i < count; i++, list++) {
	device = *list >> 8;
	if (device > 255) /* FIXME: we only use 7 bit for devices? */
	    return BadClass;

	rc = dixLookupDevice(&tdev, device, client, DixReadAccess);
	if (rc != BadDevice && rc != Success)
	    return rc;
	if (rc == BadDevice || (dev != NULL && tdev != dev))
	    return BadClass;

	for (j = 0; j < ExtEventIndex; j++)
	    if (EventInfo[j].type == (*list & 0xff)) {
		mask[device].mask |= EventInfo[j].mask;
		mask[device].dev = (Pointer) tdev;
		break;
	    }
    }
    return Success;
}

/***********************************************************************
 *
 * This procedure writes the reply for the XGrabDevice function,
 * if the client and server have a different byte ordering.
 *
 */

void
SRepXGrabDevice(ClientPtr client, int size, xGrabDeviceReply * rep)
{
    char n;

    swaps(&rep->sequenceNumber, n);
    swapl(&rep->length, n);
    WriteToClient(client, size, (char *)rep);
}