summaryrefslogtreecommitdiff
path: root/randr/rrproperty.c
blob: 12923a2c759a5c44c8b64df916d83bfde15d7751 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
/*
 * Copyright © 2006 Keith Packard
 *
 * 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, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS 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.
 */

#include "randrstr.h"
#include "propertyst.h"
#include "swaprep.h"

static int
DeliverPropertyEvent(WindowPtr pWin, void *value)
{
    xRROutputPropertyNotifyEvent *event = value;
    RREventPtr *pHead, pRREvent;
    ClientPtr client;

    pHead = LookupIDByType(pWin->drawable.id, RREventType);
    if (!pHead)
	return WT_WALKCHILDREN;

    for (pRREvent = *pHead; pRREvent; pRREvent = pRREvent->next)
    {
	client = pRREvent->client;
	if (client == serverClient || client->clientGone)
	    continue;

	if (!(pRREvent->mask & RROutputPropertyNotifyMask))
	    continue;

	event->sequenceNumber = client->sequence;
	event->window = pRREvent->window->drawable.id;
	if (client->swapped) {
	    int n;
	    swaps(&event->sequenceNumber, n);
	    swapl(&event->window, n);
	}
	WriteEventsToClient(pRREvent->client, 1, (xEvent *)event);
    }

    return WT_WALKCHILDREN;
}

static void RRDeliverPropertyEvent(ScreenPtr pScreen, xEvent *event)
{
    if (!(dispatchException & (DE_RESET | DE_TERMINATE)))
	WalkTree(pScreen, DeliverPropertyEvent, event);
}

void
RRDeleteAllOutputProperties (RROutputPtr output)
{
    RRPropertyPtr prop, next;
    xRROutputPropertyNotifyEvent    event;

    for (prop = output->properties; prop; prop = next)
    {
	next = prop->next;
	event.type = RREventBase + RRNotify;
	event.subCode = RRNotify_OutputProperty;
	event.output = output->id;
	event.state = PropertyDelete;
	event.atom = prop->propertyName;
	event.timestamp = currentTime.milliseconds;
	RRDeliverPropertyEvent (output->pScreen, (xEvent *)&event);
	if (prop->current.data)
	    xfree(prop->current.data);
	if (prop->pending.data)
	    xfree(prop->pending.data);
	xfree(prop);
    }
}

static void
RRInitOutputPropertyValue (RRPropertyValuePtr property_value)
{
    property_value->type = None;
    property_value->format = 0;
    property_value->size = 0;
    property_value->data = NULL;
}

static RRPropertyPtr
RRCreateOutputProperty (Atom property)
{
    RRPropertyPtr   prop;

    prop = (RRPropertyPtr)xalloc(sizeof(RRPropertyRec));
    if (!prop)
	return NULL;
    prop->next = NULL;
    prop->propertyName = property;
    prop->is_pending = FALSE;
    prop->range = FALSE;
    prop->immutable = FALSE;
    prop->num_valid = 0;
    prop->valid_values = NULL;
    RRInitOutputPropertyValue (&prop->current);
    RRInitOutputPropertyValue (&prop->pending);
    return prop;
}

static void
RRDestroyOutputProperty (RRPropertyPtr prop)
{
    if (prop->valid_values)
	xfree (prop->valid_values);
    if (prop->current.data)
	xfree(prop->current.data);
    if (prop->pending.data)
	xfree(prop->pending.data);
    xfree(prop);
}

void
RRDeleteOutputProperty (RROutputPtr output, Atom property)
{
    RRPropertyPtr	prop, *prev;
    xRROutputPropertyNotifyEvent    event;

    for (prev = &output->properties; (prop = *prev); prev = &(prop->next))
	if (prop->propertyName == property)
	    break;
    if (prop)
    {
	*prev = prop->next;
	event.type = RREventBase + RRNotify;
	event.subCode = RRNotify_OutputProperty;
	event.output = output->id;
	event.state = PropertyDelete;
	event.atom = prop->propertyName;
	event.timestamp = currentTime.milliseconds;
	RRDeliverPropertyEvent (output->pScreen, (xEvent *)&event);
	RRDestroyOutputProperty (prop);
    }
}

int
RRChangeOutputProperty (RROutputPtr output, Atom property, Atom type,
			int format, int mode, unsigned long len,
			pointer value, Bool sendevent, Bool pending)
{
    RRPropertyPtr		    prop;
    xRROutputPropertyNotifyEvent    event;
    rrScrPrivPtr		    pScrPriv = rrGetScrPriv(output->pScreen);
    int				    size_in_bytes;
    int				    total_size;
    unsigned long		    total_len;
    RRPropertyValuePtr		    prop_value;
    RRPropertyValueRec		    new_value;
    Bool			    add = FALSE;

    size_in_bytes = format >> 3;

    /* first see if property already exists */
    prop = RRQueryOutputProperty (output, property);
    if (!prop)   /* just add to list */
    {
	prop = RRCreateOutputProperty (property);
	if (!prop)
	    return(BadAlloc);
	add = TRUE;
	mode = PropModeReplace;
    }
    if (pending && prop->is_pending)
	prop_value = &prop->pending;
    else
	prop_value = &prop->current;

    /* To append or prepend to a property the request format and type
     must match those of the already defined property.  The
     existing format and type are irrelevant when using the mode
     "PropModeReplace" since they will be written over. */

    if ((format != prop_value->format) && (mode != PropModeReplace))
	return(BadMatch);
    if ((prop_value->type != type) && (mode != PropModeReplace))
	return(BadMatch);
    new_value = *prop_value;
    if (mode == PropModeReplace)
	total_len = len;
    else
	total_len = prop_value->size + len;

    if (mode == PropModeReplace || len > 0)
    {
	pointer	    new_data = NULL, old_data = NULL;

	total_size = total_len * size_in_bytes;
	new_value.data = (pointer)xalloc (total_size);
	if (!new_value.data && total_size)
	{
	    if (add)
		RRDestroyOutputProperty (prop);
	    return BadAlloc;
	}
	new_value.size = len;
	new_value.type = type;
	new_value.format = format;

	switch (mode) {
	case PropModeReplace:
	    new_data = new_value.data;
	    old_data = NULL;
	    break;
	case PropModeAppend:
	    new_data = (pointer) (((char *) new_value.data) + 
				  (prop_value->size * size_in_bytes));
	    old_data = new_value.data;
	    break;
	case PropModePrepend:
	    new_data = new_value.data;
	    old_data = (pointer) (((char *) new_value.data) + 
				  (prop_value->size * size_in_bytes));
	    break;
	}
	if (new_data)
	    memcpy ((char *) new_data, (char *) value, len * size_in_bytes);
	if (old_data)
	    memcpy ((char *) old_data, (char *) prop_value->data, 
		    prop_value->size * size_in_bytes);

	if (pending && pScrPriv->rrOutputSetProperty &&
	    !pScrPriv->rrOutputSetProperty(output->pScreen, output,
					   prop->propertyName, &new_value))
	{
	    if (new_value.data)
		xfree (new_value.data);
	    return (BadValue);
	}
	if (prop_value->data)
	    xfree (prop_value->data);
	*prop_value = new_value;
    }

    else if (len == 0)
    {
	/* do nothing */
    }

    if (add)
    {
	prop->next = output->properties;
	output->properties = prop;
    }

    if (pending && prop->is_pending)
	output->pendingProperties = TRUE;

    if (sendevent)
    {
	event.type = RREventBase + RRNotify;
	event.subCode = RRNotify_OutputProperty;
	event.output = output->id;
	event.state = PropertyNewValue;
	event.atom = prop->propertyName;
	event.timestamp = currentTime.milliseconds;
	RRDeliverPropertyEvent (output->pScreen, (xEvent *)&event);
    }
    return(Success);
}

Bool
RRPostPendingProperties (RROutputPtr output)
{
    RRPropertyValuePtr	pending_value;
    RRPropertyValuePtr	current_value;
    RRPropertyPtr	property;
    Bool		ret = TRUE;

    if (!output->pendingProperties)
	return TRUE;
    
    output->pendingProperties = FALSE;
    for (property = output->properties; property; property = property->next)
    {
	/* Skip non-pending properties */
	if (!property->is_pending)
	    continue;
	
	pending_value = &property->pending;
	current_value = &property->current;

	/*
	 * If the pending and current values are equal, don't mark it
	 * as changed (which would deliver an event)
	 */
	if (pending_value->type == current_value->type &&
	    pending_value->format == current_value->format &&
	    pending_value->size == current_value->size &&
	    !memcmp (pending_value->data, current_value->data,
		     pending_value->size))
	    continue;

	if (RRChangeOutputProperty (output, property->propertyName,
				    pending_value->type, pending_value->format,
				    PropModeReplace, pending_value->size,
				    pending_value->data, TRUE,
				    FALSE) != Success)
	    ret = FALSE;
    }
    return ret;
}

RRPropertyPtr
RRQueryOutputProperty (RROutputPtr output, Atom property)
{
    RRPropertyPtr   prop;
    
    for (prop = output->properties; prop; prop = prop->next)
	if (prop->propertyName == property)
	    return prop;
    return NULL;
}
		       
RRPropertyValuePtr
RRGetOutputProperty (RROutputPtr output, Atom property, Bool pending)
{
    RRPropertyPtr   prop = RRQueryOutputProperty (output, property);
    rrScrPrivPtr    pScrPriv = rrGetScrPriv(output->pScreen);

    if (!prop)
	return NULL;
    if (pending && prop->is_pending)
	return &prop->pending;
    else {
#if RANDR_13_INTERFACE
	/* If we can, try to update the property value first */
	if (pScrPriv->rrOutputGetProperty)
	    pScrPriv->rrOutputGetProperty(output->pScreen, output,
					  prop->propertyName);
#endif
	return &prop->current;
    }
}

int
RRConfigureOutputProperty (RROutputPtr output, Atom property,
			   Bool pending, Bool range, Bool immutable,
			   int num_values, INT32 *values)
{
    RRPropertyPtr   prop = RRQueryOutputProperty (output, property);
    Bool	    add = FALSE;
    INT32	    *new_values;

    if (!prop)
    {
        prop = RRCreateOutputProperty (property);
	if (!prop)
	    return(BadAlloc);
	add = TRUE;
    } else if (prop->immutable && !immutable)
	return(BadAccess);
    
    /*
     * ranges must have even number of values
     */
    if (range && (num_values & 1))
	return BadMatch;

    new_values = xalloc (num_values * sizeof (INT32));
    if (!new_values && num_values)
	return BadAlloc;
    if (num_values)
	memcpy (new_values, values, num_values * sizeof (INT32));
    
    /*
     * Property moving from pending to non-pending
     * loses any pending values
     */
    if (prop->is_pending && !pending)
    {
	if (prop->pending.data)
	    xfree (prop->pending.data);
	RRInitOutputPropertyValue (&prop->pending);
    }

    prop->is_pending = pending;
    prop->range = range;
    prop->immutable = immutable;
    prop->num_valid = num_values;
    if (prop->valid_values)
	xfree (prop->valid_values);
    prop->valid_values = new_values;

    if (add) {
	prop->next = output->properties;
	output->properties = prop;
    }

    return Success;
}

int
ProcRRListOutputProperties (ClientPtr client)
{
    REQUEST(xRRListOutputPropertiesReq);
    Atom			    *pAtoms = NULL, *temppAtoms;
    xRRListOutputPropertiesReply    rep;
    int				    numProps = 0;
    RROutputPtr			    output;
    RRPropertyPtr			    prop;
    
    REQUEST_SIZE_MATCH(xRRListOutputPropertiesReq);

    output = LookupOutput (client, stuff->output, DixReadAccess);
    
    if (!output)
        return RRErrorBase + BadRROutput;

    for (prop = output->properties; prop; prop = prop->next)
	numProps++;
    if (numProps)
        if(!(pAtoms = (Atom *)xalloc(numProps * sizeof(Atom))))
            return(BadAlloc);

    rep.type = X_Reply;
    rep.length = (numProps * sizeof(Atom)) >> 2;
    rep.sequenceNumber = client->sequence;
    rep.nAtoms = numProps;
    if (client->swapped) 
    {
	int n;
	swaps (&rep.sequenceNumber, n);
	swapl (&rep.length, n);
	swaps (&rep.nAtoms, n);
    }
    temppAtoms = pAtoms;
    for (prop = output->properties; prop; prop = prop->next)
	*temppAtoms++ = prop->propertyName;

    WriteToClient(client, sizeof(xRRListOutputPropertiesReply), (char*)&rep);
    if (numProps)
    {
        client->pSwapReplyFunc = (ReplySwapPtr)Swap32Write;
        WriteSwappedDataToClient(client, numProps * sizeof(Atom), pAtoms);
        xfree(pAtoms);
    }
    return(client->noClientException);
}

int
ProcRRQueryOutputProperty (ClientPtr client)
{
    REQUEST(xRRQueryOutputPropertyReq);
    xRRQueryOutputPropertyReply	    rep;
    RROutputPtr			    output;
    RRPropertyPtr		    prop;
    char *extra = NULL;
    
    REQUEST_SIZE_MATCH(xRRQueryOutputPropertyReq);

    output = LookupOutput (client, stuff->output, DixReadAccess);
    
    if (!output)
        return RRErrorBase + BadRROutput;
    
    prop = RRQueryOutputProperty (output, stuff->property);
    if (!prop)
	return BadName;
    
    if (prop->num_valid) {
	extra = xalloc(prop->num_valid * sizeof(INT32));
	if (!extra)
	    return BadAlloc;
    }
    rep.type = X_Reply;
    rep.length = prop->num_valid;
    rep.sequenceNumber = client->sequence;
    rep.pending = prop->is_pending;
    rep.range = prop->range;
    rep.immutable = prop->immutable;
    if (client->swapped) 
    {
	int n;
	swaps (&rep.sequenceNumber, n);
	swapl (&rep.length, n);
    }
    WriteToClient (client, sizeof (xRRQueryOutputPropertyReply), (char*)&rep);
    if (prop->num_valid)
    {
        memcpy(extra, prop->valid_values, prop->num_valid * sizeof(INT32));
        client->pSwapReplyFunc = (ReplySwapPtr)Swap32Write;
        WriteSwappedDataToClient(client, prop->num_valid * sizeof(INT32),
				 extra);
        xfree(extra);
    }
    return(client->noClientException);
}

int
ProcRRConfigureOutputProperty (ClientPtr client)
{
    REQUEST(xRRConfigureOutputPropertyReq);
    RROutputPtr				output;
    int					num_valid;
    
    REQUEST_AT_LEAST_SIZE(xRRConfigureOutputPropertyReq);

    output = LookupOutput (client, stuff->output, DixReadAccess);
    
    if (!output)
        return RRErrorBase + BadRROutput;
    
    num_valid = stuff->length - (sizeof (xRRConfigureOutputPropertyReq) >> 2);
    return RRConfigureOutputProperty (output, stuff->property,
				      stuff->pending, stuff->range,
				      FALSE, num_valid, 
				      (INT32 *) (stuff + 1));
}

int
ProcRRChangeOutputProperty (ClientPtr client)
{
    REQUEST(xRRChangeOutputPropertyReq);
    RROutputPtr	    output;
    char	    format, mode;
    unsigned long   len;
    int		    sizeInBytes;
    int		    totalSize;
    int		    err;

    REQUEST_AT_LEAST_SIZE(xRRChangeOutputPropertyReq);
    UpdateCurrentTime();
    format = stuff->format;
    mode = stuff->mode;
    if ((mode != PropModeReplace) && (mode != PropModeAppend) &&
	(mode != PropModePrepend))
    {
	client->errorValue = mode;
	return BadValue;
    }
    if ((format != 8) && (format != 16) && (format != 32))
    {
	client->errorValue = format;
        return BadValue;
    }
    len = stuff->nUnits;
    if (len > ((0xffffffff - sizeof(xChangePropertyReq)) >> 2))
	return BadLength;
    sizeInBytes = format>>3;
    totalSize = len * sizeInBytes;
    REQUEST_FIXED_SIZE(xRRChangeOutputPropertyReq, totalSize);

    output = LookupOutput (client, stuff->output, DixWriteAccess);
    if (!output)
	return RRErrorBase + BadRROutput;
    
    if (!ValidAtom(stuff->property))
    {
	client->errorValue = stuff->property;
	return(BadAtom);
    }
    if (!ValidAtom(stuff->type))
    {
	client->errorValue = stuff->type;
	return(BadAtom);
    }

    err = RRChangeOutputProperty(output, stuff->property,
				 stuff->type, (int)format,
				 (int)mode, len, (pointer)&stuff[1], TRUE, TRUE);
    if (err != Success)
	return err;
    else
	return client->noClientException;
}

int
ProcRRDeleteOutputProperty (ClientPtr client)
{
    REQUEST(xRRDeleteOutputPropertyReq);
    RROutputPtr	output;
              
    REQUEST_SIZE_MATCH(xRRDeleteOutputPropertyReq);
    UpdateCurrentTime();
    output = LookupOutput (client, stuff->output, DixWriteAccess);
    if (!output)
        return RRErrorBase + BadRROutput;
    
    if (!ValidAtom(stuff->property))
    {
	client->errorValue = stuff->property;
	return (BadAtom);
    }


    RRDeleteOutputProperty(output, stuff->property);
    return client->noClientException;
}

int
ProcRRGetOutputProperty (ClientPtr client)
{
    REQUEST(xRRGetOutputPropertyReq);
    RRPropertyPtr		prop, *prev;
    RRPropertyValuePtr		prop_value;
    unsigned long		n, len, ind;
    RROutputPtr			output;
    xRRGetOutputPropertyReply	reply;
    char			*extra = NULL;

    REQUEST_SIZE_MATCH(xRRGetOutputPropertyReq);
    if (stuff->delete)
	UpdateCurrentTime();
    output = LookupOutput (client, stuff->output, 
			   stuff->delete ? DixWriteAccess :
			   DixReadAccess);
    if (!output)
	return RRErrorBase + BadRROutput;

    if (!ValidAtom(stuff->property))
    {
	client->errorValue = stuff->property;
	return(BadAtom);
    }
    if ((stuff->delete != xTrue) && (stuff->delete != xFalse))
    {
	client->errorValue = stuff->delete;
	return(BadValue);
    }
    if ((stuff->type != AnyPropertyType) && !ValidAtom(stuff->type))
    {
	client->errorValue = stuff->type;
	return(BadAtom);
    }

    for (prev = &output->properties; (prop = *prev); prev = &prop->next)
	if (prop->propertyName == stuff->property) 
	    break;

    reply.type = X_Reply;
    reply.sequenceNumber = client->sequence;
    if (!prop) 
    {
	reply.nItems = 0;
	reply.length = 0;
	reply.bytesAfter = 0;
	reply.propertyType = None;
	reply.format = 0;
	if (client->swapped) {
	    int n;

	    swaps(&reply.sequenceNumber, n);
	    swapl(&reply.length, n);
	    swapl(&reply.propertyType, n);
	    swapl(&reply.bytesAfter, n);
	    swapl(&reply.nItems, n);
	}
	WriteToClient(client, sizeof(xRRGetOutputPropertyReply), &reply);
	return(client->noClientException);
    }

    if (prop->immutable && stuff->delete)
	return BadAccess;

    prop_value = RRGetOutputProperty(output, stuff->property, stuff->pending);
    if (!prop_value)
	return BadAtom;

    /* If the request type and actual type don't match. Return the
    property information, but not the data. */

    if (((stuff->type != prop_value->type) &&
	 (stuff->type != AnyPropertyType))
       )
    {
	reply.bytesAfter = prop_value->size;
	reply.format = prop_value->format;
	reply.length = 0;
	reply.nItems = 0;
	reply.propertyType = prop_value->type;
	if (client->swapped) {
	    int n;

	    swaps(&reply.sequenceNumber, n);
	    swapl(&reply.length, n);
	    swapl(&reply.propertyType, n);
	    swapl(&reply.bytesAfter, n);
	    swapl(&reply.nItems, n);
	}
	WriteToClient(client, sizeof(xRRGetOutputPropertyReply), &reply);
	return(client->noClientException);
    }

/*
 *  Return type, format, value to client
 */
    n = (prop_value->format/8) * prop_value->size; /* size (bytes) of prop */
    ind = stuff->longOffset << 2;        

   /* If longOffset is invalid such that it causes "len" to
	    be negative, it's a value error. */

    if (n < ind)
    {
	client->errorValue = stuff->longOffset;
	return BadValue;
    }

    len = min(n - ind, 4 * stuff->longLength);

    if (len) {
	extra = xalloc(len);
	if (!extra)
	    return BadAlloc;
    }
    reply.bytesAfter = n - (ind + len);
    reply.format = prop_value->format;
    reply.length = (len + 3) >> 2;
    if (prop_value->format)
	reply.nItems = len / (prop_value->format / 8);
    else
	reply.nItems = 0;
    reply.propertyType = prop_value->type;

    if (stuff->delete && (reply.bytesAfter == 0))
    {
	xRROutputPropertyNotifyEvent    event;

	event.type = RREventBase + RRNotify;
	event.subCode = RRNotify_OutputProperty;
	event.output = output->id;
	event.state = PropertyDelete;
	event.atom = prop->propertyName;
	event.timestamp = currentTime.milliseconds;
	RRDeliverPropertyEvent (output->pScreen, (xEvent *)&event);
    }

    if (client->swapped) {
	int n;

	swaps(&reply.sequenceNumber, n);
	swapl(&reply.length, n);
	swapl(&reply.propertyType, n);
	swapl(&reply.bytesAfter, n);
	swapl(&reply.nItems, n);
    }
    WriteToClient(client, sizeof(xGenericReply), &reply);
    if (len)
    {
	memcpy(extra, (char *)prop_value->data + ind, len);
	switch (reply.format) {
	case 32: client->pSwapReplyFunc = (ReplySwapPtr)CopySwap32Write; break;
	case 16: client->pSwapReplyFunc = (ReplySwapPtr)CopySwap16Write; break;
	default: client->pSwapReplyFunc = (ReplySwapPtr)WriteToClient; break;
	}
	WriteSwappedDataToClient(client, len,
				 extra);
	xfree(extra);
    }

    if (stuff->delete && (reply.bytesAfter == 0))
    { /* delete the Property */
	*prev = prop->next;
	RRDestroyOutputProperty (prop);
    }
    return(client->noClientException);
}