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root/cebix/SheepShaver/src/Unix/clip_unix.cpp

Comparing SheepShaver/src/Unix/clip_unix.cpp (file contents):
Revision 1.1 by cebix, 2002-02-04T16:58:13Z vs.
Revision 1.7 by gbeauche, 2004-01-10T08:46:57Z

#	Line 1 | Line 1
1		/*
2		*  clip_unix.cpp - Clipboard handling, Unix implementation
3		*
4	<	*  SheepShaver (C) 1997-2002 Christian Bauer and Marc Hellwig
4	>	*  SheepShaver (C) 1997-2003 Christian Bauer and Marc Hellwig
5		*
6		*  This program is free software; you can redistribute it and/or modify
7		*  it under the terms of the GNU General Public License as published by
#	Line 18 | Line 18
18		*  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19		*/
20
21	+	/*
22	+	*  NOTES:
23	+	*
24	+	*  We must have (fast) X11 display locking routines. Otherwise, we
25	+	*  can corrupt the X11 event queue from the emulator thread whereas
26	+	*  the redraw thread is expected to handle them.
27	+	*
28	+	*  Two functions are exported to video_x.cpp:
29	+	*    - ClipboardSelectionClear()
30	+	*      called when we lose the selection ownership
31	+	*    - ClipboardSelectionRequest()
32	+	*      called when another client wants our clipboard data
33	+	*  The display is locked by the redraw thread during their execution.
34	+	*
35	+	*  On PutScrap (Mac application wrote to clipboard), we always cache
36	+	*  the Mac clipboard to a local structure (clip_data). Then, the
37	+	*  selection ownership is grabbed until ClipboardSelectionClear()
38	+	*  occurs. In that case, contents in cache becomes invalid.
39	+	*
40	+	*  On GetScrap (Mac application reads clipboard), we always fetch
41	+	*  data from the X11 clipboard and immediately put it back to Mac
42	+	*  side. Local cache does not need to be updated. If the selection
43	+	*  owner supports the TIMESTAMP target, we can avoid useless copies.
44	+	*
45	+	*  For safety purposes, we lock the X11 display in the emulator
46	+	*  thread during the whole GetScrap/PutScrap execution. Of course, we
47	+	*  temporarily release the lock when waiting for SelectioNotify.
48	+	*
49	+	*  TODO:
50	+	*    - handle 'PICT' to image/png, image/ppm, PIXMAP (prefs order)
51	+	*    - handle 'styl' to text/richtext (OOo Writer)
52	+	*    - patch ZeroScrap so that we know when cached 'styl' is stale?
53	+	*/
54	+
55		#include "sysdeps.h"
56
57		#include <X11/Xlib.h>
58	+	#include <X11/Xatom.h>
59	+	#include <pthread.h>
60	+	#include <vector>
61
62		#include "macos_util.h"
63		#include "clip.h"
64	+	#include "prefs.h"
65	+	#include "cpu_emulation.h"
66	+	#include "main.h"
67	+	#include "emul_op.h"
68
69		#define DEBUG 0
70		#include "debug.h"
71
72	+	#ifndef NO_STD_NAMESPACE
73	+	using std::vector;
74	+	#endif
75	+
76	+
77	+	// Do we want GetScrap() to check for TIMESTAMP and optimize out clipboard syncs?
78	+	#define GETSCRAP_REQUESTS_TIMESTAMP 0
79	+
80	+	// Do we want GetScrap() to first check for TARGETS available from the clipboard?
81	+	#define GETSCRAP_REQUESTS_TARGETS 0
82	+
83
84		// From main_linux.cpp
85		extern Display *x_display;
#	Line 53 | Line 105 | static const uint8 mac2iso[0x80] = {
105		0xaf, 0x20, 0xb7, 0xb0, 0xb8, 0x22, 0xb8, 0x20
106		};
107
108	+	static const uint8 iso2mac[0x80] = {
109	+	0xad, 0xb0, 0xe2, 0xc4, 0xe3, 0xc9, 0xa0, 0xe0,
110	+	0xf6, 0xe4, 0xde, 0xdc, 0xce, 0xb2, 0xb3, 0xb6,
111	+	0xb7, 0xd4, 0xd5, 0xd2, 0xd3, 0xa5, 0xd0, 0xd1,
112	+	0xf7, 0xaa, 0xdf, 0xdd, 0xcf, 0xba, 0xfd, 0xd9,
113	+	0xca, 0xc1, 0xa2, 0xa3, 0xdb, 0xb4, 0xbd, 0xa4,
114	+	0xac, 0xa9, 0xbb, 0xc7, 0xc2, 0xf0, 0xa8, 0xf8,
115	+	0xa1, 0xb1, 0xc3, 0xc5, 0xab, 0xb5, 0xa6, 0xe1,
116	+	0xfc, 0xc6, 0xbc, 0xc8, 0xf9, 0xda, 0xd7, 0xc0,
117	+	0xcb, 0xe7, 0xe5, 0xcc, 0x80, 0x81, 0xae, 0x82,
118	+	0xe9, 0x83, 0xe6, 0xe8, 0xed, 0xea, 0xeb, 0xec,
119	+	0xf5, 0x84, 0xf1, 0xee, 0xef, 0xcd, 0x85, 0xfb,
120	+	0xaf, 0xf4, 0xf2, 0xf3, 0x86, 0xfa, 0xb8, 0xa7,
121	+	0x88, 0x87, 0x89, 0x8b, 0x8a, 0x8c, 0xbe, 0x8d,
122	+	0x8f, 0x8e, 0x90, 0x91, 0x93, 0x92, 0x94, 0x95,
123	+	0xfe, 0x96, 0x98, 0x97, 0x99, 0x9b, 0x9a, 0xd6,
124	+	0xbf, 0x9d, 0x9c, 0x9e, 0x9f, 0xff, 0xb9, 0xd8
125	+	};
126	+
127	+	// Flag: Don't convert clipboard text
128	+	static bool no_clip_conversion;
129	+
130	+	// Flag for PutScrap(): the data was put by GetScrap(), don't bounce it back to the Be side
131	+	static bool we_put_this_data = false;
132	+
133	+	// X11 variables
134	+	static int screen;                                              // Screen number
135	+	static Window rootwin, clip_win;                // Root window and the clipboard window
136	+	static Atom xa_clipboard;
137	+	static Atom xa_targets;
138	+	static Atom xa_multiple;
139	+	static Atom xa_timestamp;
140	+	static Atom xa_atom_pair;
141	+
142	+	// Define a byte array (rewrite if it's a bottleneck)
143	+	struct ByteArray : public vector<uint8> {
144	+	void resize(int size) { reserve(size); vector<uint8>::resize(size); }
145	+	uint8 *data() { return &at(0); }
146	+	};
147	+
148	+	// Clipboard data for requestors
149	+	struct ClipboardData {
150	+	Time time;
151	+	Atom type;
152	+	ByteArray data;
153	+	};
154	+	static ClipboardData clip_data;
155	+
156	+	// Prototypes
157	+	static void do_putscrap(uint32 type, void *scrap, int32 length);
158	+	static void do_getscrap(void **handle, uint32 type, int32 offset);
159	+
160	+
161	+	/*
162	+	*  Read an X11 property (hack from QT 3.1.2)
163	+	*/
164	+
165	+	static inline int max_selection_incr(Display *dpy)
166	+	{
167	+	int max_request_size = 4 * XMaxRequestSize(dpy);
168	+	if (max_request_size > 4 * 65536)
169	+	max_request_size = 4 * 65536;
170	+	else if ((max_request_size -= 100) < 0)
171	+	max_request_size = 100;
172	+	return max_request_size;
173	+	}
174	+
175	+	static bool read_property(Display *dpy, Window win,
176	+	Atom property, bool deleteProperty,
177	+	ByteArray & buffer, int *size, Atom *type,
178	+	int *format, bool nullterm)
179	+	{
180	+	int maxsize = max_selection_incr(dpy);
181	+	unsigned long bytes_left;
182	+	unsigned long length;
183	+	unsigned char *data;
184	+	Atom dummy_type;
185	+	int dummy_format;
186	+
187	+	if (!type)
188	+	type = &dummy_type;
189	+	if (!format)
190	+	format = &dummy_format;
191	+
192	+	// Don't read anything but get the size of the property data
193	+	if (XGetWindowProperty(dpy, win, property, 0, 0, False,
194	+	AnyPropertyType, type, format, &length, &bytes_left, &data) != Success) {
195	+	buffer.clear();
196	+	return false;
197	+	}
198	+	XFree(data);
199	+
200	+	int offset = 0, buffer_offset = 0, format_inc = 1, proplen = bytes_left;
201	+
202	+	switch (*format) {
203	+	case 16:
204	+	format_inc = sizeof(short) / 2;
205	+	proplen *= format_inc;
206	+	break;
207	+	case 32:
208	+	format_inc = sizeof(long) / 4;
209	+	proplen *= format_inc;
210	+	break;
211	+	}
212	+
213	+	buffer.resize(proplen + (nullterm ? 1 : 0));
214	+	while (bytes_left) {
215	+	if (XGetWindowProperty(dpy, win, property, offset, maxsize / 4,
216	+	False, AnyPropertyType, type, format,
217	+	&length, &bytes_left, &data) != Success)
218	+	break;
219	+
220	+	offset += length / (32 / *format);
221	+	length *= format_inc * (*format / 8);
222	+
223	+	memcpy(buffer.data() + buffer_offset, data, length);
224	+	buffer_offset += length;
225	+	XFree(data);
226	+	}
227	+
228	+	if (nullterm)
229	+	buffer[buffer_offset] = '\0';
230	+
231	+	if (size)
232	+	*size = buffer_offset;
233	+
234	+	if (deleteProperty)
235	+	XDeleteProperty(dpy, win, property);
236	+
237	+	XFlush(dpy);
238	+	return true;
239	+	}
240	+
241	+
242	+	/*
243	+	*  Timed wait for an SelectionNotify event
244	+	*/
245	+
246	+	static const uint64 SELECTION_MAX_WAIT = 500000; // 500 ms
247	+
248	+	static bool wait_for_selection_notify_event(Display *dpy, Window win, XEvent *event, int timeout)
249	+	{
250	+	uint64 start = GetTicks_usec();
251	+
252	+	do {
253	+	// Wait
254	+	XDisplayUnlock();
255	+	Delay_usec(5000);
256	+	XDisplayLock();
257	+
258	+	// Check for SelectionNotify event
259	+	if (XCheckTypedWindowEvent(dpy, win, SelectionNotify, event))
260	+	return true;
261	+
262	+	} while ((GetTicks_usec() - start) < timeout);
263	+
264	+	return false;
265	+	}
266	+
267
268		/*
269		*  Initialization
#	Line 60 | Line 271 | static const uint8 mac2iso[0x80] = {
271
272		void ClipInit(void)
273		{
274	+	no_clip_conversion = PrefsFindBool("noclipconversion");
275	+
276	+	// Find screen and root window
277	+	screen = XDefaultScreen(x_display);
278	+	rootwin = XRootWindow(x_display, screen);
279	+
280	+	// Create fake window to receive selection events
281	+	clip_win = XCreateSimpleWindow(x_display, rootwin, 0, 0, 1, 1, 0, 0, 0);
282	+
283	+	// Initialize X11 atoms
284	+	xa_clipboard = XInternAtom(x_display, "CLIPBOARD", False);
285	+	xa_targets = XInternAtom(x_display, "TARGETS", False);
286	+	xa_multiple = XInternAtom(x_display, "MULTIPLE", False);
287	+	xa_timestamp = XInternAtom(x_display, "TIMESTAMP", False);
288	+	xa_atom_pair = XInternAtom(x_display, "ATOM_PAIR", False);
289		}
290
291
#	Line 69 | Line 295 | void ClipInit(void)
295
296		void ClipExit(void)
297		{
298	+	// Close window
299	+	XDestroyWindow(x_display, clip_win);
300		}
301
302
#	Line 79 | Line 307 | void ClipExit(void)
307		void PutScrap(uint32 type, void *scrap, int32 length)
308		{
309		D(bug("PutScrap type %08lx, data %p, length %ld\n", type, scrap, length));
310	+	if (we_put_this_data) {
311	+	we_put_this_data = false;
312	+	return;
313	+	}
314		if (length <= 0)
315		return;
316
317	+	XDisplayLock();
318	+	do_putscrap(type, scrap, length);
319	+	XDisplayUnlock();
320	+	}
321	+
322	+	static void do_putscrap(uint32 type, void *scrap, int32 length)
323	+	{
324	+	clip_data.type = None;
325		switch (type) {
326	<	case FOURCC('T','E','X','T'):
327	<	D(bug(" clipping TEXT\n"));
326	>	case FOURCC('T','E','X','T'): {
327	>	D(bug(" clipping TEXT\n"));
328	>	clip_data.type = XA_STRING;
329	>	clip_data.data.clear();
330	>	clip_data.data.reserve(length);
331	>
332	>	// Convert text from Mac charset to ISO-Latin1
333	>	uint8 *p = (uint8 *)scrap;
334	>	for (int i=0; i<length; i++) {
335	>	uint8 c = *p++;
336	>	if (c < 0x80) {
337	>	if (c == 13)    // CR -> LF
338	>	c = 10;
339	>	} else if (!no_clip_conversion)
340	>	c = mac2iso[c & 0x7f];
341	>	clip_data.data.push_back(c);
342	>	}
343	>	break;
344	>	}
345
346	<	// Convert text from Mac charset to ISO-Latin1
347	<	uint8 *buf = new uint8[length];
348	<	uint8 *p = (uint8 *)scrap;
349	<	uint8 *q = buf;
350	<	for (int i=0; i<length; i++) {
351	<	uint8 c = *p++;
352	<	if (c < 0x80) {
353	<	if (c == 13)    // CR -> LF
354	<	c = 10;
355	<	} else
356	<	c = mac2iso[c & 0x7f];
357	<	*q++ = c;
358	<	}
346	>	case FOURCC('s','t','y','l'): {
347	>	D(bug(" clipping styl\n"));
348	>	uint16 *p = (uint16 *)scrap;
349	>	uint16 n = ntohs(*p++);
350	>	D(bug(" %d styles (%d bytes)\n", n, length));
351	>	for (int i = 0; i < n; i++) {
352	>	uint32 offset = ntohl(*(uint32 *)p); p += 2;
353	>	uint16 line_height = ntohs(*p++);
354	>	uint16 font_ascent = ntohs(*p++);
355	>	uint16 font_family = ntohs(*p++);
356	>	uint16 style_code = ntohs(*p++);
357	>	uint16 char_size = ntohs(*p++);
358	>	uint16 r = ntohs(*p++);
359	>	uint16 g = ntohs(*p++);
360	>	uint16 b = ntohs(*p++);
361	>	D(bug("  offset=%d, height=%d, font ascent=%d, id=%d, style=%x, size=%d, RGB=%x/%x/%x\n",
362	>	offset, line_height, font_ascent, font_family, style_code, char_size, r, g, b));
363	>	}
364	>	break;
365	>	}
366	>	}
367
368	<	// Put text into cut buffer
369	<	//!! XStoreBytes(x_display, buf, length);
370	<	delete[] buf;
371	<	break;
368	>	// Acquire selection ownership
369	>	if (clip_data.type != None) {
370	>	clip_data.time = CurrentTime;
371	>	while (XGetSelectionOwner(x_display, xa_clipboard) != clip_win)
372	>	XSetSelectionOwner(x_display, xa_clipboard, clip_win, clip_data.time);
373		}
374		}
375
#	Line 115 | Line 381 | void PutScrap(uint32 type, void *scrap,
381		void GetScrap(void **handle, uint32 type, int32 offset)
382		{
383		D(bug("GetScrap handle %p, type %08x, offset %d\n", handle, type, offset));
384	<	switch (type) {
384	>
385	>	XDisplayLock();
386	>	do_getscrap(handle, type, offset);
387	>	XDisplayUnlock();
388	>	}
389	>
390	>	static void do_getscrap(void **handle, uint32 type, int32 offset)
391	>	{
392	>	ByteArray data;
393	>	XEvent event;
394	>
395	>	// If we own the selection, the data is already available on MacOS side
396	>	if (XGetSelectionOwner(x_display, xa_clipboard) == clip_win)
397	>	return;
398	>
399	>	// Check TIMESTAMP
400	>	#if GETSCRAP_REQUESTS_TIMESTAMP
401	>	static Time last_timestamp = 0;
402	>	XConvertSelection(x_display, xa_clipboard, xa_timestamp, xa_clipboard, clip_win, CurrentTime);
403	>	if (wait_for_selection_notify_event(x_display, clip_win, &event, SELECTION_MAX_WAIT) &&
404	>	event.xselection.property != None &&
405	>	read_property(x_display,
406	>	event.xselection.requestor, event.xselection.property,
407	>	true, data, 0, 0, 0, false)) {
408	>	Time timestamp = ((long *)data.data())[0];
409	>	if (timestamp <= last_timestamp)
410	>	return;
411	>	}
412	>	last_timestamp = CurrentTime;
413	>	#endif
414	>
415	>	// Get TARGETS available
416	>	#if GETSCRAP_REQUESTS_TARGETS
417	>	XConvertSelection(x_display, xa_clipboard, xa_targets, xa_clipboard, clip_win, CurrentTime);
418	>	if (!wait_for_selection_notify_event(x_display, clip_win, &event, SELECTION_MAX_WAIT) ||
419	>	event.xselection.property == None ||
420	>	!read_property(x_display,
421	>	event.xselection.requestor, event.xselection.property,
422	>	true, data, 0, 0, 0, false))
423	>	return;
424	>	#endif
425	>
426	>	// Get appropriate format for requested data
427	>	Atom format = None;
428	>	#if GETSCRAP_REQUESTS_TARGETS
429	>	int n_atoms = data.size() / sizeof(long);
430	>	long *atoms = (long *)data.data();
431	>	for (int i = 0; i < n_atoms; i++) {
432	>	Atom target = atoms[i];
433	>	D(bug("  target %08x (%s)\n", target, XGetAtomName(x_display, target)));
434	>	switch (type) {
435		case FOURCC('T','E','X','T'):
436		D(bug(" clipping TEXT\n"));
437	<	//!!
437	>	if (target == XA_STRING)
438	>	format = target;
439	>	break;
440	>	case FOURCC('P','I','C','T'):
441	>	break;
442	>	}
443	>	}
444	>	#else
445	>	switch (type) {
446	>	case FOURCC('T','E','X','T'):
447	>	D(bug(" clipping TEXT\n"));
448	>	format = XA_STRING;
449	>	break;
450	>	case FOURCC('P','I','C','T'):
451	>	break;
452	>	}
453	>	#endif
454	>	if (format == None)
455	>	return;
456	>
457	>	// Get the native clipboard data
458	>	XConvertSelection(x_display, xa_clipboard, format, xa_clipboard, clip_win, CurrentTime);
459	>	if (!wait_for_selection_notify_event(x_display, clip_win, &event, SELECTION_MAX_WAIT) ||
460	>	event.xselection.property == None ||
461	>	!read_property(x_display,
462	>	event.xselection.requestor, event.xselection.property,
463	>	false, data, 0, 0, 0, format == XA_STRING))
464	>	return;
465	>
466	>	// Allocate space for new scrap in MacOS side
467	>	M68kRegisters r;
468	>	r.d[0] = data.size();
469	>	Execute68kTrap(0xa71e, &r);                     // NewPtrSysClear()
470	>	uint32 scrap_area = r.a[0];
471	>
472	>	if (scrap_area) {
473	>	switch (type) {
474	>	case FOURCC('T','E','X','T'):
475	>	// Convert text from ISO-Latin1 to Mac charset
476	>	uint8 *p = Mac2HostAddr(scrap_area);
477	>	for (int i = 0; i < data.size(); i++) {
478	>	uint8 c = data[i];
479	>	if (c < 0x80) {
480	>	if (c == 10)    // LF -> CR
481	>	c = 13;
482	>	} else if (!no_clip_conversion)
483	>	c = iso2mac[c & 0x7f];
484	>	*p++ = c;
485	>	}
486		break;
487	+	}
488	+
489	+	// Add new data to clipboard
490	+	static uint16 proc[] = {
491	+	PW(0x598f),                                     // subq.l       #4,sp
492	+	PW(0xa9fc),                                     // ZeroScrap()
493	+	PW(0x2f3c), 0, 0,                       // move.l       #length,-(sp)
494	+	PW(0x2f3c), 0, 0,                       // move.l       #type,-(sp)
495	+	PW(0x2f3c), 0, 0,                       // move.l       #outbuf,-(sp)
496	+	PW(0xa9fe),                                     // PutScrap()
497	+	PW(0x588f),                                     // addq.l       #4,sp
498	+	PW(M68K_RTS)
499	+	};
500	+	uint32 proc_area = (uint32)proc;
501	+	WriteMacInt32(proc_area +  6, data.size());
502	+	WriteMacInt32(proc_area + 12, type);
503	+	WriteMacInt32(proc_area + 18, scrap_area);
504	+	we_put_this_data = true;
505	+	Execute68k(proc_area, &r);
506	+
507	+	// We are done with scratch memory
508	+	r.a[0] = scrap_area;
509	+	Execute68kTrap(0xa01f, &r);             // DisposePtr
510	+	}
511	+	}
512	+
513	+
514	+	/*
515	+	*      Handle X11 selection events
516	+	*/
517	+
518	+	void ClipboardSelectionClear(XSelectionClearEvent *xev)
519	+	{
520	+	if (xev->selection != xa_clipboard)
521	+	return;
522	+
523	+	D(bug("Selection cleared, lost clipboard ownership\n"));
524	+	clip_data.type = None;
525	+	clip_data.data.clear();
526	+	}
527	+
528	+	// Top level selection handler
529	+	static bool handle_selection(XSelectionRequestEvent *req, bool is_multiple);
530	+
531	+	static bool handle_selection_TIMESTAMP(XSelectionRequestEvent *req)
532	+	{
533	+	// 32-bit integer values are always passed as a long whatever is its size
534	+	long timestamp = clip_data.time;
535	+
536	+	// Change requestor property
537	+	XChangeProperty(x_display, req->requestor, req->property,
538	+	XA_INTEGER, 32,
539	+	PropModeReplace, (uint8 *)&timestamp, 1);
540	+
541	+	return true;
542	+	}
543	+
544	+	static bool handle_selection_TARGETS(XSelectionRequestEvent *req)
545	+	{
546	+	// Default supported targets
547	+	vector<long> targets;
548	+	targets.push_back(xa_targets);
549	+	targets.push_back(xa_multiple);
550	+	targets.push_back(xa_timestamp);
551	+
552	+	// Extra targets matchin current clipboard data
553	+	if (clip_data.type != None)
554	+	targets.push_back(clip_data.type);
555	+
556	+	// Change requestor property
557	+	XChangeProperty(x_display, req->requestor, req->property,
558	+	xa_targets, 32,
559	+	PropModeReplace, (uint8 *)&targets.at(0), targets.size());
560	+
561	+	return true;
562	+	}
563	+
564	+	static bool handle_selection_STRING(XSelectionRequestEvent *req)
565	+	{
566	+	// Make sure we have valid data to send though ICCCM compliant
567	+	// clients should have first requested TARGETS to identify
568	+	// this possibility.
569	+	if (clip_data.type != XA_STRING)
570	+	return false;
571	+
572	+	// Send the string, it's already encoded as ISO-8859-1
573	+	XChangeProperty(x_display, req->requestor, req->property,
574	+	XA_STRING, 8,
575	+	PropModeReplace, (uint8 *)clip_data.data.data(), clip_data.data.size());
576	+
577	+	return true;
578	+	}
579	+
580	+	static bool handle_selection_MULTIPLE(XSelectionRequestEvent *req)
581	+	{
582	+	Atom rtype;
583	+	int rformat;
584	+	ByteArray data;
585	+
586	+	if (!read_property(x_display, req->requestor, req->property,
587	+	false, data, 0, &rtype, &rformat, 0))
588	+	return false;
589	+
590	+	// rtype should be ATOM_PAIR but some clients don't honour that
591	+	if (rformat != 32)
592	+	return false;
593	+
594	+	struct AtomPair { long target; long property; };
595	+	AtomPair *atom_pairs = (AtomPair *)data.data();
596	+	int n_atom_pairs = data.size() / sizeof(AtomPair);
597	+
598	+	bool handled = true;
599	+	if (n_atom_pairs) {
600	+	// Setup a new XSelectionRequestEvent when servicing individual requests
601	+	XSelectionRequestEvent event;
602	+	memcpy(&event, req, sizeof(event));
603	+
604	+	for (int i = 0; i < n_atom_pairs; i++) {
605	+	Atom target = atom_pairs[i].target;
606	+	Atom property = atom_pairs[i].property;
607	+
608	+	// None is not a valid property
609	+	if (property == None)
610	+	continue;
611	+
612	+	// Service this request
613	+	event.target = target;
614	+	event.property = property;
615	+	if (!handle_selection(&event, true)) {
616	+	/* FIXME: ICCCM 2.6.2:
617	+
618	+	If the owner fails to convert the target named by an
619	+	atom in the MULTIPLE property, it should replace that
620	+	atom in the property with None.
621	+	*/
622	+	handled = false;
623	+	}
624	+	}
625		}
626	+
627	+	return handled;
628	+	}
629	+
630	+	static bool handle_selection(XSelectionRequestEvent *req, bool is_multiple)
631	+	{
632	+	bool handled =false;
633	+
634	+	if (req->target == xa_timestamp)
635	+	handled = handle_selection_TIMESTAMP(req);
636	+	else if (req->target == xa_targets)
637	+	handled = handle_selection_TARGETS(req);
638	+	else if (req->target == XA_STRING)
639	+	handled = handle_selection_STRING(req);
640	+	else if (req->target == xa_multiple)
641	+	handled = handle_selection_MULTIPLE(req);
642	+
643	+	// Notify requestor only when we are done with his request
644	+	if (handled && !is_multiple) {
645	+	XEvent out_event;
646	+	out_event.xselection.type      = SelectionNotify;
647	+	out_event.xselection.requestor = req->requestor;
648	+	out_event.xselection.selection = req->selection;
649	+	out_event.xselection.target    = req->target;
650	+	out_event.xselection.property  = handled ? req->property : None;
651	+	out_event.xselection.time      = req->time;
652	+	XSendEvent(x_display, req->requestor, False, 0, &out_event);
653	+	}
654	+	}
655	+
656	+	void ClipboardSelectionRequest(XSelectionRequestEvent *req)
657	+	{
658	+	if (req->requestor == clip_win || req->selection != xa_clipboard)
659	+	return;
660	+
661	+	D(bug("Selection requested from 0x%lx to 0x%lx (%s) 0x%lx (%s)\n",
662	+	req->requestor,
663	+	req->selection,
664	+	XGetAtomName(req->display, req->selection),
665	+	req->target,
666	+	XGetAtomName(req->display, req->target)));
667	+
668	+	handle_selection(req, false);
669		}

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