xserver/Xi/grabdev.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
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
HEWLETT-PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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********************************************************/

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

#include <dix-config.h>

#include <X11/extensions/XI.h>
#include <X11/extensions/XIproto.h>

#include "dix/dix_priv.h"

#include "inputstr.h"           /* DeviceIntPtr      */
#include "windowstr.h"          /* window structure  */
#include "exglobals.h"
#include "grabdev.h"

extern XExtEventInfo EventInfo[];
extern int ExtEventIndex;

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

int _X_COLD
SProcXGrabDevice(ClientPtr client)
{
    REQUEST(xGrabDeviceReq);
    REQUEST_AT_LEAST_SIZE(xGrabDeviceReq);

    swapl(&stuff->grabWindow);
    swapl(&stuff->time);
    swaps(&stuff->event_count);

    if (client->req_len !=
        bytes_to_int32(sizeof(xGrabDeviceReq)) + 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;
    DeviceIntPtr dev;
    GrabMask mask;
    struct tmask tmp[EMASKSIZE];

    REQUEST(xGrabDeviceReq);
    REQUEST_AT_LEAST_SIZE(xGrabDeviceReq);

    if (client->req_len !=
        bytes_to_int32(sizeof(xGrabDeviceReq)) + stuff->event_count)
        return BadLength;

    xGrabDeviceReply rep = {
        .repType = X_Reply,
        .RepType = X_GrabDevice,
        .sequenceNumber = client->sequence,
    };

    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;

    mask.xi = tmp[stuff->deviceid].mask;

    rc = GrabDevice(client, dev, stuff->other_devices_mode,
                    stuff->this_device_mode, stuff->grabWindow,
                    stuff->ownerEvents, stuff->time,
                    &mask, XI, None, None, &rep.status);

    if (rc != Success)
        return rc;

    if (client->swapped) {
        swaps(&rep.sequenceNumber);
        swapl(&rep.length);
    }
    WriteToClient(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 class 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;

    memset(mask, 0, EMASKSIZE * sizeof(struct tmask));

    for (i = 0; i < count; i++, list++) {
        device = *list >> 8;
        if (device > 255)
            return BadClass;

        rc = dixLookupDevice(&tdev, device, client, DixUseAccess);
        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 = (void *) tdev;
                break;
            }
    }
    return Success;
}