keyboard.c@ 36335

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FE/Common/VBoxKeyboard: some release logging
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1	/* $Id: keyboard.c 36335 2011-03-21 21:58:58Z vboxsync $ */
2	/** @file
3	* VBox/Frontends/Common - X11 keyboard handler library.
4	*/
5
6	/* This code is originally from the Wine project. */
7
8	/*
9	* X11 keyboard driver
10	*
11	* Copyright 1993 Bob Amstadt
12	* Copyright 1996 Albrecht Kleine
13	* Copyright 1997 David Faure
14	* Copyright 1998 Morten Welinder
15	* Copyright 1998 Ulrich Weigand
16	* Copyright 1999 Ove K�ven
17	*
18	* This library is free software; you can redistribute it and/or
19	* modify it under the terms of the GNU Lesser General Public
20	* License as published by the Free Software Foundation; either
21	* version 2.1 of the License, or (at your option) any later version.
22	*
23	* This library is distributed in the hope that it will be useful,
24	* but WITHOUT ANY WARRANTY; without even the implied warranty of
25	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
26	* Lesser General Public License for more details.
27	*
28	* You should have received a copy of the GNU Lesser General Public
29	* License along with this library; if not, write to the Free Software
30	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
31	*/
32
33	/*
34	* Oracle LGPL Disclaimer: For the avoidance of doubt, except that if any license choice
35	* other than GPL or LGPL is available it will apply instead, Oracle elects to use only
36	* the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where
37	* a choice of LGPL license versions is made available with the language indicating
38	* that LGPLv2 or any later version may be used, or where a choice of which version
39	* of the LGPL is applied is otherwise unspecified.
40	*/
41
42	#include <X11/Xatom.h>
43	#include <X11/keysym.h>
44	#include <X11/XKBlib.h>
45	#include <X11/Xlib.h>
46	#include <X11/Xresource.h>
47	#include <X11/Xutil.h>
48
49	#include <ctype.h>
50	#include <stdarg.h>
51	#include <string.h>
52	#include <stdlib.h>
53	#include <stdio.h>
54
55	#include <VBox/VBoxKeyboard.h>
56
57	#define KEYC2SCAN_SIZE 256
58
59	/**
60	* Array containing the current mapping of keycodes to scan codes, detected
61	* using the keyboard layout algorithm in X11DRV_InitKeyboardByLayout.
62	*/
63	static unsigned keyc2scan[KEYC2SCAN_SIZE];
64	/** Whether to output basic debugging information to standard output */
65	static int log_kb_1 = 0;
66	/** Whether to output verbose debugging information to standard output */
67	static int log_kb_2 = 0;
68
69	/** Output basic debugging information if wished */
70	#define LOG_KB_1(a) \
71	do { \
72	if (log_kb_1) { \
73	printf a; \
74	} \
75	} while (0)
76
77	/** Output verbose debugging information if wished */
78	#define LOG_KB_2(a) \
79	do { \
80	if (log_kb_2) { \
81	printf a; \
82	} \
83	} while (0)
84
85	/** Keyboard layout tables for guessing the current keyboard layout. */
86	#include "keyboard-tables.h"
87
88	/** Tables of keycode to scan code mappings for well-known keyboard types. */
89	#include "keyboard-types.h"
90
91	/**
92	* Translate a keycode in a key event to a scan code. If the keycode maps
93	* to a key symbol which is in the same place on all PC keyboards, look it
94	* up by symbol in one of our hard-coded translation tables. It it maps to
95	* a symbol which can be in a different place on different PC keyboards, look
96	* it up by keycode using either the lookup table which we constructed
97	* earlier, or using a hard-coded table if we know what type of keyboard is
98	* in use.
99	*
100	* @returns the scan code number, with 0x100 added for extended scan codes
101	* @param code the X11 key code to be looked up
102	*/
103
104	unsigned X11DRV_KeyEvent(Display *display, KeyCode code)
105	{
106	unsigned scan;
107	KeySym keysym = XKeycodeToKeysym(display, code, 0);
108	scan = 0;
109	if (keyc2scan[code] == 0 && keysym != 0)
110	{
111	if ((keysym >> 8) == 0xFF) /* non-character key */
112	scan = nonchar_key_scan[keysym & 0xff];
113	else if ((keysym >> 8) == 0x1008FF) /* XFree86 vendor keys */
114	scan = xfree86_vendor_key_scan[keysym & 0xff];
115	else if ((keysym >> 8) == 0x1005FF) /* Sun keys */
116	scan = sun_key_scan[keysym & 0xff];
117	else if (keysym == 0x20) /* Spacebar */
118	scan = 0x39;
119	else if (keysym == 0xFE03) /* ISO level3 shift, aka AltGr */
120	scan = 0x138;
121	else if (keysym == 0xFE11) /* ISO level5 shift, R-Ctrl on */
122	scan = 0x11d; /* Canadian multilingual layout */
123	}
124	if (keyc2scan[code])
125	scan = keyc2scan[code];
126
127	return scan;
128	}
129
130	/**
131	* Called from X11DRV_InitKeyboardByLayout
132	* See the comments for that function for a description what this function
133	* does.
134	*
135	* @returns an index into the table of keyboard layouts, or 0 if absolutely
136	* nothing fits
137	* @param display pointer to the X11 display handle
138	* @param min_keycode the lowest value in use as a keycode on this server
139	* @param max_keycode the highest value in use as a keycode on this server
140	*/
141	static int
142	X11DRV_KEYBOARD_DetectLayout (Display *display, unsigned min_keycode,
143	unsigned max_keycode)
144	{
145	/** Counter variable for iterating through the keyboard layout tables. */
146	unsigned current;
147	/** The best candidate so far for the layout. */
148	unsigned kbd_layout = 0;
149	/** The number of matching keys in the current best candidate layout. */
150	unsigned max_score = 0;
151	/** The number of changes of scan-code direction in the current
152	best candidate. */
153	unsigned max_seq = 0;
154	/** Table for the current keycode to keysym mapping. */
155	char ckey[256][2];
156	/** Counter variable representing a keycode */
157	unsigned keyc;
158
159	/* Fill in our keycode to keysym mapping table. */
160	memset( ckey, 0, sizeof(ckey) );
161	for (keyc = min_keycode; keyc <= max_keycode; keyc++) {
162	/* get data for keycodes from X server */
163	KeySym keysym = XKeycodeToKeysym (display, keyc, 0);
164	/* We leave keycodes which will definitely not be in the lookup tables
165	marked with 0 so that we know that we know not to look them up when
166	we scan the tables. */
167	if ( (0xFF != (keysym >> 8)) /* Non-character key */
168	&& (0x1008FF != (keysym >> 8)) /* XFree86 vendor keys */
169	&& (0x1005FF != (keysym >> 8)) /* Sun keys */
170	&& (0x20 != keysym) /* Spacebar */
171	&& (0xFE03 != keysym) /* ISO level3 shift, aka AltGr */
172	) {
173	ckey[keyc][0] = keysym & 0xFF;
174	ckey[keyc][1] = XKeycodeToKeysym(display, keyc, 1) & 0xFF;
175	}
176	}
177
178	/* Now scan the lookup tables, looking for one that is as close as
179	possible to our current keycode to keysym mapping. */
180	for (current = 0; main_key_tab[current].comment; current++) {
181	/** How many keys have matched so far in this layout? */
182	unsigned match = 0;
183	/** How many keys have not changed the direction? */
184	unsigned seq = 0;
185	/** Pointer to the layout we are currently comparing against. */
186	const char (*lkey)[MAIN_LEN][2] = main_key_tab[current].key;
187	/** For detecting dvorak layouts - in which direction do the server's
188	keycodes seem to be running? We count the number of times that
189	this direction changes as an additional hint as to how likely this
190	layout is to be the right one. */
191	int direction = 1;
192	/** The keycode of the last key that we matched. This is used to
193	determine the direction that the keycodes are running in. */
194	int pkey = -1;
195	LOG_KB_2(("Attempting to match against \"%s\"\n", main_key_tab[current].comment));
196	for (keyc = min_keycode; keyc <= max_keycode; keyc++) {
197	if (0 != ckey[keyc][0]) {
198	/** The candidate key in the current layout for this keycode. */
199	int key;
200	/** Does this key match? */
201	int ok = 0;
202	/* search for a match in layout table */
203	for (key = 0; (key < MAIN_LEN) && (0 == ok); key++) {
204	if ( ((*lkey)[key][0] == ckey[keyc][0])
205	&& ((*lkey)[key][1] == ckey[keyc][1])
206	) {
207	ok = 1;
208	}
209	}
210	/* count the matches and mismatches */
211	if (0 != ok) {
212	match++;
213	/* How well in sequence are the keys? For dvorak layouts. */
214	if (key > pkey) {
215	if (1 == direction) {
216	++seq;
217	} else {
218	direction = -1;
219	}
220	}
221	if (key < pkey) {
222	if (1 != direction) {
223	++seq;
224	} else {
225	direction = 1;
226	}
227	}
228	pkey = key;
229	} else {
230	#ifdef DEBUG
231	/* print spaces instead of \0's */
232	char str[3] = " ";
233	if ((ckey[keyc][0] > 32) && (ckey[keyc][0] < 127)) {
234	str[0] = ckey[keyc][0];
235	}
236	if ((ckey[keyc][0] > 32) && (ckey[keyc][0] < 127)) {
237	str[0] = ckey[keyc][0];
238	}
239	LOG_KB_2(("Mismatch for keycode %d, keysym \"%s\" (0x%.2hx 0x%.2hx)\n",
240	keyc, str, ckey[keyc][0], ckey[keyc][1]));
241	#endif /* DEBUG defined */
242	}
243	}
244	}
245	LOG_KB_2(("Matches=%d, seq=%d\n", match, seq));
246	if ( (match > max_score)
247	\|\| ((match == max_score) && (seq > max_seq))
248	) {
249	/* best match so far */
250	kbd_layout = current;
251	max_score = match;
252	max_seq = seq;
253	}
254	}
255	/* we're done, report results if necessary */
256	LOG_KB_1(("Detected layout is \"%s\", matches=%d, seq=%d\n",
257	main_key_tab[kbd_layout].comment, max_score, max_seq));
258	return kbd_layout;
259	}
260
261	/**
262	* Initialise the X11 keyboard driver by building up a table to convert X11
263	* keycodes to scan codes using a heuristic based on comparing the current
264	* keyboard map to known international keyboard layouts.
265	* The basic idea is to examine each key in the current layout to see which
266	* characters it produces in its normal and its "shifted" state, and to look
267	* for known keyboard layouts which it could belong to. We then guess the
268	* current layout based on the number of matches we find.
269	* One difficulty with this approach is so-called Dvorak layouts, which are
270	* identical to non-Dvorak layouts, but with the keys in a different order.
271	* To deal with this, we compare the different candidate layouts to see in
272	* which one the X11 keycodes would be most sequential and hope that they
273	* really are arranged more or less sequentially.
274	*
275	* The actual detection of the current layout is done in the sub-function
276	* X11DRV_KEYBOARD_DetectLayout. Once we have determined the layout, since we
277	* know which PC scan code corresponds to each key in the layout, we can use
278	* this information to associate the scan code with an X11 keycode, which is
279	* what the rest of this function does.
280	*
281	* @warning not re-entrant
282	* @returns 1 if the layout found was optimal, 0 if it was not. This is
283	* for diagnostic purposes
284	* @param display a pointer to the X11 display
285	*/
286	static unsigned
287	X11DRV_InitKeyboardByLayout(Display *display)
288	{
289	KeySym keysym;
290	unsigned scan;
291	int keyc, keyn;
292	const char (*lkey)[MAIN_LEN][2];
293	int min_keycode, max_keycode;
294	int kbd_layout;
295	unsigned matches = 0, entries = 0;
296
297	/* Should we log to standard output? */
298	if (NULL != getenv("LOG_KB_PRIMARY")) {
299	log_kb_1 = 1;
300	}
301	if (NULL != getenv("LOG_KB_SECONDARY")) {
302	log_kb_1 = 1;
303	log_kb_2 = 1;
304	}
305	XDisplayKeycodes(display, &min_keycode, &max_keycode);
306
307	/* according to the space this function is guaranteed to never return
308	* values for min_keycode < 8 and values for max_keycode > 255 */
309	if (min_keycode < 0)
310	min_keycode = 0;
311	if (max_keycode > 255)
312	max_keycode = 255;
313
314	/* Detect the keyboard layout */
315	kbd_layout = X11DRV_KEYBOARD_DetectLayout(display, min_keycode,
316	max_keycode);
317	lkey = main_key_tab[kbd_layout].key;
318
319	/* Now build a conversion array :
320	* keycode -> scancode + extended */
321
322	for (keyc = min_keycode; keyc <= max_keycode; keyc++)
323	{
324	keysym = XKeycodeToKeysym(display, keyc, 0);
325	scan = 0;
326	if (keysym) /* otherwise, keycode not used */
327	{
328	/* Skip over keysyms which we look up on the fly */
329	if ( (0xFF != (keysym >> 8)) /* Non-character key */
330	&& (0x1008FF != (keysym >> 8)) /* XFree86 vendor keys */
331	&& (0x1005FF != (keysym >> 8)) /* Sun keys */
332	&& (0x20 != keysym) /* Spacebar */
333	&& (0xFE03 != keysym) /* ISO level3 shift, aka AltGr */
334	) {
335	unsigned found = 0;
336
337	/* we seem to need to search the layout-dependent scancodes */
338	char unshifted = keysym & 0xFF;
339	char shifted = XKeycodeToKeysym(display, keyc, 1) & 0xFF;
340	/* find a key which matches */
341	for (keyn = 0; (0 == found) && (keyn<MAIN_LEN); keyn++) {
342	if ( ((*lkey)[keyn][0] == unshifted)
343	&& ((*lkey)[keyn][1] == shifted)
344	) {
345	found = 1;
346	}
347	}
348	if (0 != found) {
349	/* got it */
350	scan = main_key_scan[keyn - 1];
351	/* We keep track of the number of keys that we found a
352	* match for to see if the layout is optimal or not.
353	* We ignore the 102nd key though (key number 48), since
354	* not all keyboards have it. */
355	if (keyn != 48)
356	++matches;
357	}
358	if (0 == scan) {
359	/* print spaces instead of \0's */
360	char str[3] = " ";
361	if ((unshifted > 32) && (unshifted < 127)) {
362	str[0] = unshifted;
363	}
364	if ((shifted > 32) && (shifted < 127)) {
365	str[1] = shifted;
366	}
367	LOG_KB_1(("No match found for keycode %d, keysym \"%s\" (0x%x 0x%x)\n",
368	keyc, str, unshifted, shifted));
369	} else if ((keyc > 8) && (keyc < 97) && (keyc - scan != 8)) {
370	/* print spaces instead of \0's */
371	char str[3] = " ";
372	if ((unshifted > 32) && (unshifted < 127)) {
373	str[0] = unshifted;
374	}
375	if ((shifted > 32) && (shifted < 127)) {
376	str[1] = shifted;
377	}
378	LOG_KB_1(("Warning - keycode %d, keysym \"%s\" (0x%x 0x%x) was matched to scancode %d\n",
379	keyc, str, unshifted, shifted, scan));
380	}
381	}
382	}
383	keyc2scan[keyc] = scan;
384	} /* for */
385	/* Did we find a match for all keys in the layout? Count them first.
386	* Note that we skip the 102nd key, so that owners of 101 key keyboards
387	* don't get bogus messages about bad matches. */
388	for (entries = 0, keyn = 0; keyn < MAIN_LEN; ++keyn) {
389	if ( (0 != (*lkey)[keyn][0])
390	&& (0 != (*lkey)[keyn][1])
391	&& (keyn != 47) /* don't count the 102nd key */
392	) {
393	++entries;
394	}
395	}
396	LOG_KB_1(("Finished mapping keyboard, matches=%d, entries=%d (excluding 102nd key)\n", matches, entries));
397	if (matches != entries)
398	{
399	return 0;
400	}
401	return 1;
402	}
403
404	static int checkHostKeycode(unsigned hostCode, unsigned targetCode)
405	{
406	if (!targetCode)
407	return 0;
408	if (hostCode && hostCode != targetCode)
409	return 0;
410	return 1;
411	}
412
413	static int compKBMaps(const keyboard_type pHost, const keyboard_type pTarget)
414	{
415	if ( !pHost->lctrl && !pHost->capslock && !pHost->lshift && !pHost->tab
416	&& !pHost->esc && !pHost->enter && !pHost->up && !pHost->down
417	&& !pHost->left && !pHost->right && !pHost->f1 && !pHost->f2
418	&& !pHost->f3 && !pHost->f4 && !pHost->f5 && !pHost->f6 && !pHost->f7
419	&& !pHost->f8)
420	return 0;
421	/* This test is for the people who like to swap control and caps lock */
422	if ( ( !checkHostKeycode(pHost->lctrl, pTarget->lctrl)
423	\|\| !checkHostKeycode(pHost->capslock, pTarget->capslock))
424	&& ( !checkHostKeycode(pHost->lctrl, pTarget->capslock)
425	\|\| !checkHostKeycode(pHost->capslock, pTarget->lctrl)))
426	return 0;
427	if ( !checkHostKeycode(pHost->lshift, pTarget->lshift)
428	\|\| !checkHostKeycode(pHost->tab, pTarget->tab)
429	\|\| !checkHostKeycode(pHost->esc, pTarget->esc)
430	\|\| !checkHostKeycode(pHost->enter, pTarget->enter)
431	\|\| !checkHostKeycode(pHost->up, pTarget->up)
432	\|\| !checkHostKeycode(pHost->down, pTarget->down)
433	\|\| !checkHostKeycode(pHost->left, pTarget->left)
434	\|\| !checkHostKeycode(pHost->right, pTarget->right)
435	\|\| !checkHostKeycode(pHost->f1, pTarget->f1)
436	\|\| !checkHostKeycode(pHost->f2, pTarget->f2)
437	\|\| !checkHostKeycode(pHost->f3, pTarget->f3)
438	\|\| !checkHostKeycode(pHost->f4, pTarget->f4)
439	\|\| !checkHostKeycode(pHost->f5, pTarget->f5)
440	\|\| !checkHostKeycode(pHost->f6, pTarget->f6)
441	\|\| !checkHostKeycode(pHost->f7, pTarget->f7)
442	\|\| !checkHostKeycode(pHost->f8, pTarget->f8))
443	return 0;
444	return 1;
445	}
446
447	static int findHostKBInList(const keyboard_type *pHost,
448	const keyboard_type *pList, int cList)
449	{
450	int i = 0;
451	for (; i < cList; ++i)
452	if (compKBMaps(pHost, &pList[i]))
453	return i;
454	return -1;
455	}
456
457	#ifdef DEBUG
458	static void testFindHostKB(void)
459	{
460	keyboard_type hostBasic =
461	{ NULL, 1 /* lctrl /, 2, 3, 4, 5, 6, 7 / up /, 8, 9, 10, 11 / F1 */,
462	12, 13, 14, 15, 16, 17, 18 };
463	keyboard_type hostSwapCtrlCaps =
464	{ NULL, 3 /* lctrl /, 2, 1, 4, 5, 6, 7 / up /, 8, 9, 10, 11 / F1 */,
465	12, 13, 14, 15, 16, 17, 18 };
466	keyboard_type hostEmpty =
467	{ NULL, 0 /* lctrl /, 0, 0, 0, 0, 0, 0 / up /, 0, 0, 0, 0 / F1 */,
468	0, 0, 0, 0, 0, 0, 0 };
469	keyboard_type hostNearlyEmpty =
470	{ NULL, 1 /* lctrl /, 0, 0, 0, 0, 0, 0 / up /, 0, 0, 0, 0 / F1 */,
471	0, 0, 0, 0, 0, 0, 18 };
472	keyboard_type hostNearlyRight =
473	{ NULL, 20 /* lctrl /, 2, 3, 4, 5, 6, 7 / up /, 8, 9, 10, 11 / F1 */,
474	12, 13, 14, 15, 16, 17, 18 };
475	keyboard_type targetList[] = {
476	{ NULL, 18 /* lctrl /, 17, 16, 15, 14, 13, 12 / up */, 11, 10, 9,
477	8 /* F1 */, 7, 6, 5, 4, 3, 2, 1 },
478	{ NULL, 1 /* lctrl /, 2, 3, 4, 5, 6, 7 / up */, 8, 9, 10,
479	11 /* F1 */, 12, 13, 14, 15, 16, 17, 18 }
480	};
481
482	/* As we don't have assertions here, just printf. This should really
483	* never happen. */
484	if ( hostBasic.f8 != 18 \|\| hostSwapCtrlCaps.f8 != 18
485	\|\| hostNearlyEmpty.f8 != 18 \|\| hostNearlyRight.f8 != 18
486	\|\| targetList[0].f8 != 1 \|\| targetList[1].f8 != 18)
487	printf("ERROR: testFindHostKB: bad structures\n");
488	if (findHostKBInList(&hostBasic, targetList, 2) != 1)
489	printf("ERROR: findHostKBInList failed to find a target in a list\n");
490	if (findHostKBInList(&hostSwapCtrlCaps, targetList, 2) != 1)
491	printf("ERROR: findHostKBInList failed on a ctrl-caps swapped map\n");
492	if (findHostKBInList(&hostEmpty, targetList, 2) != -1)
493	printf("ERROR: findHostKBInList accepted an empty host map\n");
494	if (findHostKBInList(&hostNearlyEmpty, targetList, 2) != 1)
495	printf("ERROR: findHostKBInList failed on a partly empty host map\n");
496	if (findHostKBInList(&hostNearlyRight, targetList, 2) != -1)
497	printf("ERROR: findHostKBInList failed to fail a wrong host map\n");
498	}
499	#endif
500
501	static unsigned
502	X11DRV_InitKeyboardByType(Display *display)
503	{
504	keyboard_type hostKB;
505	int cMap;
506
507	hostKB.lctrl = XKeysymToKeycode(display, XK_Control_L);
508	hostKB.capslock = XKeysymToKeycode(display, XK_Caps_Lock);
509	hostKB.lshift = XKeysymToKeycode(display, XK_Shift_L);
510	hostKB.tab = XKeysymToKeycode(display, XK_Tab);
511	hostKB.esc = XKeysymToKeycode(display, XK_Escape);
512	hostKB.enter = XKeysymToKeycode(display, XK_Return);
513	hostKB.up = XKeysymToKeycode(display, XK_Up);
514	hostKB.down = XKeysymToKeycode(display, XK_Down);
515	hostKB.left = XKeysymToKeycode(display, XK_Left);
516	hostKB.right = XKeysymToKeycode(display, XK_Right);
517	hostKB.f1 = XKeysymToKeycode(display, XK_F1);
518	hostKB.f2 = XKeysymToKeycode(display, XK_F2);
519	hostKB.f3 = XKeysymToKeycode(display, XK_F3);
520	hostKB.f4 = XKeysymToKeycode(display, XK_F4);
521	hostKB.f5 = XKeysymToKeycode(display, XK_F5);
522	hostKB.f6 = XKeysymToKeycode(display, XK_F6);
523	hostKB.f7 = XKeysymToKeycode(display, XK_F7);
524	hostKB.f8 = XKeysymToKeycode(display, XK_F8);
525
526	#ifdef DEBUG
527	testFindHostKB();
528	#endif
529	cMap = findHostKBInList(&hostKB, main_keyboard_type_list,
530	sizeof(main_keyboard_type_list)
531	/ sizeof(main_keyboard_type_list[0]));
532	#ifdef DEBUG
533	/* Assertion */
534	if (sizeof(keyc2scan) != sizeof(main_keyboard_type_scans[cMap]))
535	{
536	printf("ERROR: keyc2scan array size doesn't match main_keyboard_type_scans[]!\n");
537	return 0;
538	}
539	#endif
540	if (cMap >= 0)
541	{
542	memcpy(keyc2scan, main_keyboard_type_scans[cMap], sizeof(keyc2scan));
543	return 1;
544	}
545	return 0;
546	}
547
548	/**
549	* Checks for the XKB extension, and if it is found initialises the X11 keycode
550	* to XT scan code mapping by looking at the XKB names for each keycode.
551	*/
552	static unsigned
553	X11DRV_InitKeyboardByXkb(Display *pDisplay)
554	{
555	int major = XkbMajorVersion, minor = XkbMinorVersion;
556	XkbDescPtr pKBDesc;
557	if (!XkbLibraryVersion(&major, &minor))
558	return 0;
559	if (!XkbQueryExtension(pDisplay, NULL, NULL, &major, &minor, NULL))
560	return 0;
561	pKBDesc = XkbGetKeyboard(pDisplay, XkbAllComponentsMask, XkbUseCoreKbd);
562	if (!pKBDesc)
563	return 0;
564	if (XkbGetNames(pDisplay, XkbKeyNamesMask, pKBDesc) != Success)
565	return 0;
566	{
567	unsigned i, j;
568
569	memset(keyc2scan, 0, sizeof(keyc2scan));
570	for (i = pKBDesc->min_key_code; i < pKBDesc->max_key_code; ++i)
571	for (j = 0; j < sizeof(xkbMap) / sizeof(xkbMap[0]); ++j)
572	if (!memcmp(xkbMap[j].cszName,
573	&pKBDesc->names->keys->name[i * XKB_NAME_SIZE],
574	XKB_NAME_SIZE))
575	{
576	keyc2scan[i] = xkbMap[j].uScan;
577	break;
578	}
579	}
580	XkbFreeNames(pKBDesc, XkbKeyNamesMask, True);
581	XkbFreeKeyboard(pKBDesc, XkbAllComponentsMask, True);
582	return 1;
583	}
584
585	/**
586	* Initialise the X11 keyboard driver by finding which X11 keycodes correspond
587	* to which PC scan codes. If the keyboard being used is not a PC keyboard,
588	* the X11 keycodes will be mapped to the scan codes which the equivalent keys
589	* on a PC keyboard would use.
590	*
591	* We use two algorithms to try to determine the mapping. See the comments
592	* attached to the two algorithm functions (X11DRV_InitKeyboardByLayout and
593	* X11DRV_InitKeyboardByType) for descriptions of the algorithms used. Both
594	* functions tell us on return whether they think that they have correctly
595	* determined the mapping. If both functions claim to have determined the
596	* mapping correctly, we prefer the second (ByType). However, if neither does
597	* then we prefer the first (ByLayout), as it produces a fuzzy result which is
598	* still likely to be partially correct.
599	*
600	* @warning not re-entrant
601	* @returns 1 if the layout found was optimal, 0 if it was not. This is
602	* for diagnostic purposes
603	* @param display a pointer to the X11 display
604	* @param byLayoutOK diagnostic - set to one if detection by layout
605	* succeeded, and to 0 otherwise
606	* @param byTypeOK diagnostic - set to one if detection by type
607	* succeeded, and to 0 otherwise
608	* @param byXkbOK diagnostic - set to one if detection using XKB
609	* succeeded, and to 0 otherwise
610	* @param remapScancode array of tuples that remap the keycode (first
611	* part) to a scancode (second part)
612	* @note Xkb takes precedence over byType takes precedence over byLayout,
613	* for anyone who wants to log information about which method is in
614	* use. byLayout is the fallback, as it is likely to be partly usable
615	* even if it doesn't initialise correctly.
616	*/
617	unsigned X11DRV_InitKeyboard(Display display, unsigned byLayoutOK,
618	unsigned byTypeOK, unsigned byXkbOK,
619	int (*remapScancodes)[2])
620	{
621	unsigned byLayout, byType, byXkb;
622
623	byLayout = X11DRV_InitKeyboardByLayout(display);
624	if (byLayoutOK)
625	*byLayoutOK = byLayout;
626
627	byType = X11DRV_InitKeyboardByType(display);
628	if (byTypeOK)
629	*byTypeOK = byType;
630
631	byXkb = X11DRV_InitKeyboardByXkb(display);
632	if (byXkbOK)
633	*byXkbOK = byXkb;
634
635	/* Remap keycodes after initialization. Remapping stops after an
636	identity mapping is seen */
637	if (remapScancodes != NULL)
638	for (; (remapScancodes)[0] != (remapScancodes)[1]; remapScancodes++)
639	keyc2scan[(remapScancodes)[0]] = (remapScancodes)[1];
640
641	return (byLayout \|\| byType \|\| byXkb) ? 1 : 0;
642	}
643
644	/**
645	* Returns the keycode to scancode array
646	*/
647	unsigned *X11DRV_getKeyc2scan(void)
648	{
649	return keyc2scan;
650	}
651

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source: vbox/trunk/src/VBox/Frontends/Common/VBoxKeyboard/keyboard.c@ 36335

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