dix: Refactoring of selection code to allow for polyinstantiation.

Introduces dixLookupSelection() API.
Removes NumCurrentSelections from API.

1 files changed, 306 insertions, 0 deletions

diff --git a/dix/selection.c b/dix/selection.c
new file mode 100644
index 000000000..e2e279a6f
--- /dev/null
+++ b/dix/selection.c
@@ -0,0 +1,306 @@
+/************************************************************
+
+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
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+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;
+static int NumCurrentSelections;
+CallbackListPtr SelectionCallback;
+
+_X_EXPORT int
+dixLookupSelection(Selection **result, Atom selectionName,
+		   ClientPtr client, Mask access_mode)
+{
+    Selection *pSel = NULL;
+    int i, rc = BadMatch;
+    client->errorValue = selectionName;
+
+    for (i = 0; i < NumCurrentSelections; i++)
+	if (CurrentSelections[i].selection == selectionName) {
+	    pSel = CurrentSelections + i;
+	    rc = XaceHookSelectionAccess(client, selectionName, access_mode);
+	    break;
+	}
+
+    *result = pSel;
+    return rc;
+}
+
+void
+InitSelections(void)
+{
+    Selection *pSel = CurrentSelections;
+
+    for (; pSel - CurrentSelections < NumCurrentSelections; pSel++)
+	dixFreePrivates(pSel->devPrivates);
+
+    xfree(CurrentSelections);
+    CurrentSelections = NULL;
+    NumCurrentSelections = 0;
+}
+
+static _X_INLINE void
+CallSelectionCallback(Selection *pSel, ClientPtr client,
+		      SelectionCallbackKind kind)
+{
+    SelectionInfoRec info = { pSel, client, kind };
+    CallCallbacks(&SelectionCallback, &info);
+}
+
+void
+DeleteWindowFromAnySelections(WindowPtr pWin)
+{
+    Selection *pSel = CurrentSelections;
+
+    for (; pSel - CurrentSelections < NumCurrentSelections; pSel++)
+        if (pSel->pWin == pWin) {
+	    CallSelectionCallback(pSel, NULL, SelectionWindowDestroy);
+
+            pSel->pWin = (WindowPtr)NULL;
+            pSel->window = None;
+	    pSel->client = NullClient;
+	}
+}
+
+void
+DeleteClientFromAnySelections(ClientPtr client)
+{
+    Selection *pSel = CurrentSelections;
+
+    for (; pSel - CurrentSelections < NumCurrentSelections; pSel++)
+        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, &event, 1, NoEventMask,
+			    NoEventMask /* CantBeFiltered */, NullGrab);
+	}
+    }
+    else if (rc == BadMatch)
+    {
+	/*
+	 * It doesn't exist, so add it...
+	 */
+	int size = (NumCurrentSelections + 1) * sizeof(Selection);
+	CurrentSelections = xrealloc(CurrentSelections, size);
+	if (!CurrentSelections) {
+	    NumCurrentSelections = 0;
+	    return BadAlloc;
+	}
+	pSel = CurrentSelections + NumCurrentSelections;
+	pSel->selection = stuff->selection;
+	pSel->devPrivates = NULL;
+	pSel->next = NULL;
+	if (NumCurrentSelections > 0)
+	    CurrentSelections[NumCurrentSelections - 1].next = pSel;
+	NumCurrentSelections++;
+    }
+    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, &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, &event, 1, NoEventMask,
+		    NoEventMask /* CantBeFiltered */, NullGrab);
+    return client->noClientException;
+}