xserver-multidpi/dix/selection.c

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

Copyright 1987, 1989, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
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in this Software without prior written authorization from The Open Group.


Copyright 1987, 1989 by Digital Equipment Corporation, Maynard, Massachusetts.

                        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 Digital not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

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

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

#include "windowstr.h"
#include "dixstruct.h"
#include "dispatch.h"
#include "selection.h"
#include "xace.h"

/*****************************************************************
 * Selection Stuff
 *
 *    dixLookupSelection
 *
 *   Selections are global to the server.  The list of selections should
 *   not be traversed directly.  Instead, use the functions listed above.
 *
 *****************************************************************/

_X_EXPORT Selection *CurrentSelections;
_X_EXPORT CallbackListPtr SelectionCallback;

_X_EXPORT int
dixLookupSelection(Selection **result, Atom selectionName,
		   ClientPtr client, Mask access_mode)
{
    Selection *pSel;
    int rc = BadMatch;
    client->errorValue = selectionName;

    for (pSel = CurrentSelections; pSel; pSel = pSel->next)
	if (pSel->selection == selectionName)
	    break;

    if (pSel)
	rc = XaceHookSelectionAccess(client, &pSel, access_mode);
    *result = pSel;
    return rc;
}

_X_EXPORT void
InitSelections(void)
{
    Selection *pSel, *pNextSel;

    pSel = CurrentSelections;
    while (pSel) {
	pNextSel = pSel->next;
	dixFreePrivates(pSel->devPrivates);
	xfree(pSel);
	pSel = pNextSel;
    }

    CurrentSelections = NULL;
}

static _X_INLINE void
CallSelectionCallback(Selection *pSel, ClientPtr client,
		      SelectionCallbackKind kind)
{
    SelectionInfoRec info = { pSel, client, kind };
    CallCallbacks(&SelectionCallback, &info);
}

_X_EXPORT void
DeleteWindowFromAnySelections(WindowPtr pWin)
{
    Selection *pSel;

    for (pSel = CurrentSelections; pSel; pSel = pSel->next)
        if (pSel->pWin == pWin) {
	    CallSelectionCallback(pSel, NULL, SelectionWindowDestroy);

            pSel->pWin = (WindowPtr)NULL;
            pSel->window = None;
	    pSel->client = NullClient;
	}
}

_X_EXPORT void
DeleteClientFromAnySelections(ClientPtr client)
{
    Selection *pSel;

    for (pSel = CurrentSelections; pSel; pSel = pSel->next)
        if (pSel->client == client) {
	    CallSelectionCallback(pSel, NULL, SelectionClientClose);

            pSel->pWin = (WindowPtr)NULL;
            pSel->window = None;
	    pSel->client = NullClient;
	}
}

int
ProcSetSelectionOwner(ClientPtr client)
{
    WindowPtr pWin = NULL;
    TimeStamp time;
    Selection *pSel;
    int rc;

    REQUEST(xSetSelectionOwnerReq);
    REQUEST_SIZE_MATCH(xSetSelectionOwnerReq);

    UpdateCurrentTime();
    time = ClientTimeToServerTime(stuff->time);

    /* If the client's time stamp is in the future relative to the server's
	time stamp, do not set the selection, just return success. */
    if (CompareTimeStamps(time, currentTime) == LATER)
    	return Success;

    if (stuff->window != None) {
	rc = dixLookupWindow(&pWin, stuff->window, client, DixSetAttrAccess);
        if (rc != Success)
            return rc;
    }
    if (!ValidAtom(stuff->selection)) {
	client->errorValue = stuff->selection;
        return BadAtom;
    }

    /*
     * First, see if the selection is already set...
     */
    rc = dixLookupSelection(&pSel, stuff->selection, client, DixSetAttrAccess);

    if (rc == Success) {
	xEvent event;

	/* If the timestamp in client's request is in the past relative
	   to the time stamp indicating the last time the owner of the
	   selection was set, do not set the selection, just return 
	   success. */
	if (CompareTimeStamps(time, pSel->lastTimeChanged) == EARLIER)
	    return Success;
	if (pSel->client && (!pWin || (pSel->client != client)))
	{
	    event.u.u.type = SelectionClear;
	    event.u.selectionClear.time = time.milliseconds;
	    event.u.selectionClear.window = pSel->window;
	    event.u.selectionClear.atom = pSel->selection;
	    TryClientEvents(pSel->client, NULL, &event, 1, NoEventMask,
			    NoEventMask /* CantBeFiltered */, NullGrab);
	}
    }
    else if (rc == BadMatch)
    {
	/*
	 * It doesn't exist, so add it...
	 */
	pSel = xalloc(sizeof(Selection));
	if (!pSel)
	    return BadAlloc;

	pSel->selection = stuff->selection;
	pSel->devPrivates = NULL;

	/* security creation/labeling check */
	rc = XaceHookSelectionAccess(client, &pSel,
				     DixCreateAccess|DixSetAttrAccess);
	if (rc != Success) {
	    xfree(pSel);
	    return rc;
	}

	pSel->next = CurrentSelections;
	CurrentSelections = pSel;
    }
    else
	return rc;

    pSel->lastTimeChanged = time;
    pSel->window = stuff->window;
    pSel->pWin = pWin;
    pSel->client = (pWin ? client : NullClient);

    CallSelectionCallback(pSel, client, SelectionSetOwner);
    return client->noClientException;
}

int
ProcGetSelectionOwner(ClientPtr client)
{
    int rc;
    Selection *pSel;
    xGetSelectionOwnerReply reply;

    REQUEST(xResourceReq);
    REQUEST_SIZE_MATCH(xResourceReq);

    if (!ValidAtom(stuff->id)) {
	client->errorValue = stuff->id;
        return BadAtom;
    }

    reply.type = X_Reply;
    reply.length = 0;
    reply.sequenceNumber = client->sequence;

    rc = dixLookupSelection(&pSel, stuff->id, client, DixGetAttrAccess);
    if (rc == Success)
	reply.owner = pSel->window;
    else if (rc == BadMatch)
	reply.owner = None;
    else
	return rc;

    WriteReplyToClient(client, sizeof(xGetSelectionOwnerReply), &reply);
    return client->noClientException;
}

int
ProcConvertSelection(ClientPtr client)
{
    Bool paramsOkay;
    xEvent event;
    WindowPtr pWin;
    Selection *pSel;
    int rc;

    REQUEST(xConvertSelectionReq);
    REQUEST_SIZE_MATCH(xConvertSelectionReq);

    rc = dixLookupWindow(&pWin, stuff->requestor, client, DixSetAttrAccess);
    if (rc != Success)
        return rc;

    paramsOkay = ValidAtom(stuff->selection) && ValidAtom(stuff->target);
    paramsOkay &= (stuff->property == None) || ValidAtom(stuff->property);
    if (!paramsOkay) {
	client->errorValue = stuff->property;
        return BadAtom;
    }

    rc = dixLookupSelection(&pSel, stuff->selection, client, DixReadAccess);

    if (rc != Success && rc != BadMatch)
	return rc;
    else if (rc == Success && pSel->window != None) {
	event.u.u.type = SelectionRequest;
	event.u.selectionRequest.owner = pSel->window;
	event.u.selectionRequest.time = stuff->time;
	event.u.selectionRequest.requestor = stuff->requestor;
	event.u.selectionRequest.selection = stuff->selection;
	event.u.selectionRequest.target = stuff->target;
	event.u.selectionRequest.property = stuff->property;
	if (TryClientEvents(pSel->client, NULL, &event, 1, NoEventMask,
			    NoEventMask /* CantBeFiltered */, NullGrab))
	    return client->noClientException;
    }

    event.u.u.type = SelectionNotify;
    event.u.selectionNotify.time = stuff->time;
    event.u.selectionNotify.requestor = stuff->requestor;
    event.u.selectionNotify.selection = stuff->selection;
    event.u.selectionNotify.target = stuff->target;
    event.u.selectionNotify.property = None;
    TryClientEvents(client, NULL, &event, 1, NoEventMask,
		    NoEventMask /* CantBeFiltered */, NullGrab);
    return client->noClientException;
}