keyboard.c@ 33656

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1	/* $Id: keyboard.c 33656 2010-11-01 14:18:11Z 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	}
122	if (keyc2scan[code])
123	scan = keyc2scan[code];
124
125	return scan;
126	}
127
128	/**
129	* Called from X11DRV_InitKeyboardByLayout
130	* See the comments for that function for a description what this function
131	* does.
132	*
133	* @returns an index into the table of keyboard layouts, or 0 if absolutely
134	* nothing fits
135	* @param display pointer to the X11 display handle
136	* @param min_keycode the lowest value in use as a keycode on this server
137	* @param max_keycode the highest value in use as a keycode on this server
138	*/
139	static int
140	X11DRV_KEYBOARD_DetectLayout (Display *display, unsigned min_keycode,
141	unsigned max_keycode)
142	{
143	/** Counter variable for iterating through the keyboard layout tables. */
144	unsigned current;
145	/** The best candidate so far for the layout. */
146	unsigned kbd_layout = 0;
147	/** The number of matching keys in the current best candidate layout. */
148	unsigned max_score = 0;
149	/** The number of changes of scan-code direction in the current
150	best candidate. */
151	unsigned max_seq = 0;
152	/** Table for the current keycode to keysym mapping. */
153	char ckey[256][2];
154	/** Counter variable representing a keycode */
155	unsigned keyc;
156
157	/* Fill in our keycode to keysym mapping table. */
158	memset( ckey, 0, sizeof(ckey) );
159	for (keyc = min_keycode; keyc <= max_keycode; keyc++) {
160	/* get data for keycodes from X server */
161	KeySym keysym = XKeycodeToKeysym (display, keyc, 0);
162	/* We leave keycodes which will definitely not be in the lookup tables
163	marked with 0 so that we know that we know not to look them up when
164	we scan the tables. */
165	if ( (0xFF != (keysym >> 8)) /* Non-character key */
166	&& (0x1008FF != (keysym >> 8)) /* XFree86 vendor keys */
167	&& (0x1005FF != (keysym >> 8)) /* Sun keys */
168	&& (0x20 != keysym) /* Spacebar */
169	&& (0xFE03 != keysym) /* ISO level3 shift, aka AltGr */
170	) {
171	ckey[keyc][0] = keysym & 0xFF;
172	ckey[keyc][1] = XKeycodeToKeysym(display, keyc, 1) & 0xFF;
173	}
174	}
175
176	/* Now scan the lookup tables, looking for one that is as close as
177	possible to our current keycode to keysym mapping. */
178	for (current = 0; main_key_tab[current].comment; current++) {
179	/** How many keys have matched so far in this layout? */
180	unsigned match = 0;
181	/** How many keys have not changed the direction? */
182	unsigned seq = 0;
183	/** Pointer to the layout we are currently comparing against. */
184	const char (*lkey)[MAIN_LEN][2] = main_key_tab[current].key;
185	/** For detecting dvorak layouts - in which direction do the server's
186	keycodes seem to be running? We count the number of times that
187	this direction changes as an additional hint as to how likely this
188	layout is to be the right one. */
189	int direction = 1;
190	/** The keycode of the last key that we matched. This is used to
191	determine the direction that the keycodes are running in. */
192	int pkey = -1;
193	LOG_KB_2(("Attempting to match against \"%s\"\n", main_key_tab[current].comment));
194	for (keyc = min_keycode; keyc <= max_keycode; keyc++) {
195	if (0 != ckey[keyc][0]) {
196	/** The candidate key in the current layout for this keycode. */
197	int key;
198	/** Does this key match? */
199	int ok = 0;
200	/* search for a match in layout table */
201	for (key = 0; (key < MAIN_LEN) && (0 == ok); key++) {
202	if ( ((*lkey)[key][0] == ckey[keyc][0])
203	&& ((*lkey)[key][1] == ckey[keyc][1])
204	) {
205	ok = 1;
206	}
207	}
208	/* count the matches and mismatches */
209	if (0 != ok) {
210	match++;
211	/* How well in sequence are the keys? For dvorak layouts. */
212	if (key > pkey) {
213	if (1 == direction) {
214	++seq;
215	} else {
216	direction = -1;
217	}
218	}
219	if (key < pkey) {
220	if (1 != direction) {
221	++seq;
222	} else {
223	direction = 1;
224	}
225	}
226	pkey = key;
227	} else {
228	#ifdef DEBUG
229	/* print spaces instead of \0's */
230	char str[3] = " ";
231	if ((ckey[keyc][0] > 32) && (ckey[keyc][0] < 127)) {
232	str[0] = ckey[keyc][0];
233	}
234	if ((ckey[keyc][0] > 32) && (ckey[keyc][0] < 127)) {
235	str[0] = ckey[keyc][0];
236	}
237	LOG_KB_2(("Mismatch for keycode %d, keysym \"%s\" (0x%.2hx 0x%.2hx)\n",
238	keyc, str, ckey[keyc][0], ckey[keyc][1]));
239	#endif /* DEBUG defined */
240	}
241	}
242	}
243	LOG_KB_2(("Matches=%d, seq=%d\n", match, seq));
244	if ( (match > max_score)
245	\|\| ((match == max_score) && (seq > max_seq))
246	) {
247	/* best match so far */
248	kbd_layout = current;
249	max_score = match;
250	max_seq = seq;
251	}
252	}
253	/* we're done, report results if necessary */
254	LOG_KB_1(("Detected layout is \"%s\", matches=%d, seq=%d\n",
255	main_key_tab[kbd_layout].comment, max_score, max_seq));
256	return kbd_layout;
257	}
258
259	/**
260	* Initialise the X11 keyboard driver by building up a table to convert X11
261	* keycodes to scan codes using a heuristic based on comparing the current
262	* keyboard map to known international keyboard layouts.
263	* The basic idea is to examine each key in the current layout to see which
264	* characters it produces in its normal and its "shifted" state, and to look
265	* for known keyboard layouts which it could belong to. We then guess the
266	* current layout based on the number of matches we find.
267	* One difficulty with this approach is so-called Dvorak layouts, which are
268	* identical to non-Dvorak layouts, but with the keys in a different order.
269	* To deal with this, we compare the different candidate layouts to see in
270	* which one the X11 keycodes would be most sequential and hope that they
271	* really are arranged more or less sequentially.
272	*
273	* The actual detection of the current layout is done in the sub-function
274	* X11DRV_KEYBOARD_DetectLayout. Once we have determined the layout, since we
275	* know which PC scan code corresponds to each key in the layout, we can use
276	* this information to associate the scan code with an X11 keycode, which is
277	* what the rest of this function does.
278	*
279	* @warning not re-entrant
280	* @returns 1 if the layout found was optimal, 0 if it was not. This is
281	* for diagnostic purposes
282	* @param display a pointer to the X11 display
283	*/
284	static unsigned
285	X11DRV_InitKeyboardByLayout(Display *display)
286	{
287	KeySym keysym;
288	unsigned scan;
289	int keyc, keyn;
290	const char (*lkey)[MAIN_LEN][2];
291	int min_keycode, max_keycode;
292	int kbd_layout;
293	unsigned matches = 0, entries = 0;
294
295	/* Should we log to standard output? */
296	if (NULL != getenv("LOG_KB_PRIMARY")) {
297	log_kb_1 = 1;
298	}
299	if (NULL != getenv("LOG_KB_SECONDARY")) {
300	log_kb_1 = 1;
301	log_kb_2 = 1;
302	}
303	XDisplayKeycodes(display, &min_keycode, &max_keycode);
304
305	/* according to the space this function is guaranteed to never return
306	* values for min_keycode < 8 and values for max_keycode > 255 */
307	if (min_keycode < 0)
308	min_keycode = 0;
309	if (max_keycode > 255)
310	max_keycode = 255;
311
312	/* Detect the keyboard layout */
313	kbd_layout = X11DRV_KEYBOARD_DetectLayout(display, min_keycode,
314	max_keycode);
315	lkey = main_key_tab[kbd_layout].key;
316
317	/* Now build a conversion array :
318	* keycode -> scancode + extended */
319
320	for (keyc = min_keycode; keyc <= max_keycode; keyc++)
321	{
322	keysym = XKeycodeToKeysym(display, keyc, 0);
323	scan = 0;
324	if (keysym) /* otherwise, keycode not used */
325	{
326	/* Skip over keysyms which we look up on the fly */
327	if ( (0xFF != (keysym >> 8)) /* Non-character key */
328	&& (0x1008FF != (keysym >> 8)) /* XFree86 vendor keys */
329	&& (0x1005FF != (keysym >> 8)) /* Sun keys */
330	&& (0x20 != keysym) /* Spacebar */
331	&& (0xFE03 != keysym) /* ISO level3 shift, aka AltGr */
332	) {
333	unsigned found = 0;
334
335	/* we seem to need to search the layout-dependent scancodes */
336	char unshifted = keysym & 0xFF;
337	char shifted = XKeycodeToKeysym(display, keyc, 1) & 0xFF;
338	/* find a key which matches */
339	for (keyn = 0; (0 == found) && (keyn<MAIN_LEN); keyn++) {
340	if ( ((*lkey)[keyn][0] == unshifted)
341	&& ((*lkey)[keyn][1] == shifted)
342	) {
343	found = 1;
344	}
345	}
346	if (0 != found) {
347	/* got it */
348	scan = main_key_scan[keyn - 1];
349	/* We keep track of the number of keys that we found a
350	* match for to see if the layout is optimal or not.
351	* We ignore the 102nd key though (key number 48), since
352	* not all keyboards have it. */
353	if (keyn != 48)
354	++matches;
355	}
356	if (0 == scan) {
357	/* print spaces instead of \0's */
358	char str[3] = " ";
359	if ((unshifted > 32) && (unshifted < 127)) {
360	str[0] = unshifted;
361	}
362	if ((shifted > 32) && (shifted < 127)) {
363	str[1] = shifted;
364	}
365	LOG_KB_1(("No match found for keycode %d, keysym \"%s\" (0x%x 0x%x)\n",
366	keyc, str, unshifted, shifted));
367	} else if ((keyc > 8) && (keyc < 97) && (keyc - scan != 8)) {
368	/* print spaces instead of \0's */
369	char str[3] = " ";
370	if ((unshifted > 32) && (unshifted < 127)) {
371	str[0] = unshifted;
372	}
373	if ((shifted > 32) && (shifted < 127)) {
374	str[1] = shifted;
375	}
376	LOG_KB_1(("Warning - keycode %d, keysym \"%s\" (0x%x 0x%x) was matched to scancode %d\n",
377	keyc, str, unshifted, shifted, scan));
378	}
379	}
380	}
381	keyc2scan[keyc] = scan;
382	} /* for */
383	/* Did we find a match for all keys in the layout? Count them first.
384	* Note that we skip the 102nd key, so that owners of 101 key keyboards
385	* don't get bogus messages about bad matches. */
386	for (entries = 0, keyn = 0; keyn < MAIN_LEN; ++keyn) {
387	if ( (0 != (*lkey)[keyn][0])
388	&& (0 != (*lkey)[keyn][1])
389	&& (keyn != 47) /* don't count the 102nd key */
390	) {
391	++entries;
392	}
393	}
394	LOG_KB_1(("Finished mapping keyboard, matches=%d, entries=%d (excluding 102nd key)\n", matches, entries));
395	if (matches != entries)
396	{
397	return 0;
398	}
399	return 1;
400	}
401
402	static int checkHostKeycode(unsigned hostCode, unsigned targetCode)
403	{
404	if (!targetCode)
405	return 0;
406	if (hostCode && hostCode != targetCode)
407	return 0;
408	return 1;
409	}
410
411	static int compKBMaps(const keyboard_type pHost, const keyboard_type pTarget)
412	{
413	if ( !pHost->lctrl && !pHost->capslock && !pHost->lshift && !pHost->tab
414	&& !pHost->esc && !pHost->enter && !pHost->up && !pHost->down
415	&& !pHost->left && !pHost->right && !pHost->f1 && !pHost->f2
416	&& !pHost->f3 && !pHost->f4 && !pHost->f5 && !pHost->f6 && !pHost->f7
417	&& !pHost->f8)
418	return 0;
419	/* This test is for the people who like to swap control and caps lock */
420	if ( ( !checkHostKeycode(pHost->lctrl, pTarget->lctrl)
421	\|\| !checkHostKeycode(pHost->capslock, pTarget->capslock))
422	&& ( !checkHostKeycode(pHost->lctrl, pTarget->capslock)
423	\|\| !checkHostKeycode(pHost->capslock, pTarget->lctrl)))
424	return 0;
425	if ( !checkHostKeycode(pHost->lshift, pTarget->lshift)
426	\|\| !checkHostKeycode(pHost->tab, pTarget->tab)
427	\|\| !checkHostKeycode(pHost->esc, pTarget->esc)
428	\|\| !checkHostKeycode(pHost->enter, pTarget->enter)
429	\|\| !checkHostKeycode(pHost->up, pTarget->up)
430	\|\| !checkHostKeycode(pHost->down, pTarget->down)
431	\|\| !checkHostKeycode(pHost->left, pTarget->left)
432	\|\| !checkHostKeycode(pHost->right, pTarget->right)
433	\|\| !checkHostKeycode(pHost->f1, pTarget->f1)
434	\|\| !checkHostKeycode(pHost->f2, pTarget->f2)
435	\|\| !checkHostKeycode(pHost->f3, pTarget->f3)
436	\|\| !checkHostKeycode(pHost->f4, pTarget->f4)
437	\|\| !checkHostKeycode(pHost->f5, pTarget->f5)
438	\|\| !checkHostKeycode(pHost->f6, pTarget->f6)
439	\|\| !checkHostKeycode(pHost->f7, pTarget->f7)
440	\|\| !checkHostKeycode(pHost->f8, pTarget->f8))
441	return 0;
442	return 1;
443	}
444
445	static int findHostKBInList(const keyboard_type *pHost,
446	const keyboard_type *pList, int cList)
447	{
448	int i = 0;
449	for (; i < cList; ++i)
450	if (compKBMaps(pHost, &pList[i]))
451	return i;
452	return -1;
453	}
454
455	#ifdef DEBUG
456	static void testFindHostKB(void)
457	{
458	keyboard_type hostBasic =
459	{ NULL, 1 /* lctrl /, 2, 3, 4, 5, 6, 7 / up /, 8, 9, 10, 11 / F1 */,
460	12, 13, 14, 15, 16, 17, 18 };
461	keyboard_type hostSwapCtrlCaps =
462	{ NULL, 3 /* lctrl /, 2, 1, 4, 5, 6, 7 / up /, 8, 9, 10, 11 / F1 */,
463	12, 13, 14, 15, 16, 17, 18 };
464	keyboard_type hostEmpty =
465	{ NULL, 0 /* lctrl /, 0, 0, 0, 0, 0, 0 / up /, 0, 0, 0, 0 / F1 */,
466	0, 0, 0, 0, 0, 0, 0 };
467	keyboard_type hostNearlyEmpty =
468	{ NULL, 1 /* lctrl /, 0, 0, 0, 0, 0, 0 / up /, 0, 0, 0, 0 / F1 */,
469	0, 0, 0, 0, 0, 0, 18 };
470	keyboard_type hostNearlyRight =
471	{ NULL, 20 /* lctrl /, 2, 3, 4, 5, 6, 7 / up /, 8, 9, 10, 11 / F1 */,
472	12, 13, 14, 15, 16, 17, 18 };
473	keyboard_type targetList[] = {
474	{ NULL, 18 /* lctrl /, 17, 16, 15, 14, 13, 12 / up */, 11, 10, 9,
475	8 /* F1 */, 7, 6, 5, 4, 3, 2, 1 },
476	{ NULL, 1 /* lctrl /, 2, 3, 4, 5, 6, 7 / up */, 8, 9, 10,
477	11 /* F1 */, 12, 13, 14, 15, 16, 17, 18 }
478	};
479
480	/* As we don't have assertions here, just printf. This should really
481	* never happen. */
482	if ( hostBasic.f8 != 18 \|\| hostSwapCtrlCaps.f8 != 18
483	\|\| hostNearlyEmpty.f8 != 18 \|\| hostNearlyRight.f8 != 18
484	\|\| targetList[0].f8 != 1 \|\| targetList[1].f8 != 18)
485	printf("ERROR: testFindHostKB: bad structures\n");
486	if (findHostKBInList(&hostBasic, targetList, 2) != 1)
487	printf("ERROR: findHostKBInList failed to find a target in a list\n");
488	if (findHostKBInList(&hostSwapCtrlCaps, targetList, 2) != 1)
489	printf("ERROR: findHostKBInList failed on a ctrl-caps swapped map\n");
490	if (findHostKBInList(&hostEmpty, targetList, 2) != -1)
491	printf("ERROR: findHostKBInList accepted an empty host map\n");
492	if (findHostKBInList(&hostNearlyEmpty, targetList, 2) != 1)
493	printf("ERROR: findHostKBInList failed on a partly empty host map\n");
494	if (findHostKBInList(&hostNearlyRight, targetList, 2) != -1)
495	printf("ERROR: findHostKBInList failed to fail a wrong host map\n");
496	}
497	#endif
498
499	static unsigned
500	X11DRV_InitKeyboardByType(Display *display)
501	{
502	keyboard_type hostKB;
503	int cMap;
504
505	hostKB.lctrl = XKeysymToKeycode(display, XK_Control_L);
506	hostKB.capslock = XKeysymToKeycode(display, XK_Caps_Lock);
507	hostKB.lshift = XKeysymToKeycode(display, XK_Shift_L);
508	hostKB.tab = XKeysymToKeycode(display, XK_Tab);
509	hostKB.esc = XKeysymToKeycode(display, XK_Escape);
510	hostKB.enter = XKeysymToKeycode(display, XK_Return);
511	hostKB.up = XKeysymToKeycode(display, XK_Up);
512	hostKB.down = XKeysymToKeycode(display, XK_Down);
513	hostKB.left = XKeysymToKeycode(display, XK_Left);
514	hostKB.right = XKeysymToKeycode(display, XK_Right);
515	hostKB.f1 = XKeysymToKeycode(display, XK_F1);
516	hostKB.f2 = XKeysymToKeycode(display, XK_F2);
517	hostKB.f3 = XKeysymToKeycode(display, XK_F3);
518	hostKB.f4 = XKeysymToKeycode(display, XK_F4);
519	hostKB.f5 = XKeysymToKeycode(display, XK_F5);
520	hostKB.f6 = XKeysymToKeycode(display, XK_F6);
521	hostKB.f7 = XKeysymToKeycode(display, XK_F7);
522	hostKB.f8 = XKeysymToKeycode(display, XK_F8);
523
524	#ifdef DEBUG
525	testFindHostKB();
526	#endif
527	cMap = findHostKBInList(&hostKB, main_keyboard_type_list,
528	sizeof(main_keyboard_type_list)
529	/ sizeof(main_keyboard_type_list[0]));
530	#ifdef DEBUG
531	/* Assertion */
532	if (sizeof(keyc2scan) != sizeof(main_keyboard_type_scans[cMap]))
533	{
534	printf("ERROR: keyc2scan array size doesn't match main_keyboard_type_scans[]!\n");
535	return 0;
536	}
537	#endif
538	if (cMap >= 0)
539	{
540	memcpy(keyc2scan, main_keyboard_type_scans[cMap], sizeof(keyc2scan));
541	return 1;
542	}
543	return 0;
544	}
545
546	/**
547	* Checks for the XKB extension, and if it is found initialises the X11 keycode
548	* to XT scan code mapping by looking at the XKB names for each keycode.
549	*/
550	static unsigned
551	X11DRV_InitKeyboardByXkb(Display *pDisplay)
552	{
553	int major = XkbMajorVersion, minor = XkbMinorVersion;
554	XkbDescPtr pKBDesc;
555	if (!XkbLibraryVersion(&major, &minor))
556	return 0;
557	if (!XkbQueryExtension(pDisplay, NULL, NULL, &major, &minor, NULL))
558	return 0;
559	pKBDesc = XkbGetKeyboard(pDisplay, XkbAllComponentsMask, XkbUseCoreKbd);
560	if (!pKBDesc)
561	return 0;
562	if (XkbGetNames(pDisplay, XkbKeyNamesMask, pKBDesc) != Success)
563	return 0;
564	{
565	unsigned i, j;
566
567	memset(keyc2scan, 0, sizeof(keyc2scan));
568	for (i = pKBDesc->min_key_code; i < pKBDesc->max_key_code; ++i)
569	for (j = 0; j < sizeof(xkbMap) / sizeof(xkbMap[0]); ++j)
570	if (!memcmp(xkbMap[j].cszName,
571	&pKBDesc->names->keys->name[i * XKB_NAME_SIZE],
572	XKB_NAME_SIZE))
573	{
574	keyc2scan[i] = xkbMap[j].uScan;
575	break;
576	}
577	}
578	XkbFreeNames(pKBDesc, XkbKeyNamesMask, True);
579	XkbFreeKeyboard(pKBDesc, XkbAllComponentsMask, True);
580	return 1;
581	}
582
583	/**
584	* Initialise the X11 keyboard driver by finding which X11 keycodes correspond
585	* to which PC scan codes. If the keyboard being used is not a PC keyboard,
586	* the X11 keycodes will be mapped to the scan codes which the equivalent keys
587	* on a PC keyboard would use.
588	*
589	* We use two algorithms to try to determine the mapping. See the comments
590	* attached to the two algorithm functions (X11DRV_InitKeyboardByLayout and
591	* X11DRV_InitKeyboardByType) for descriptions of the algorithms used. Both
592	* functions tell us on return whether they think that they have correctly
593	* determined the mapping. If both functions claim to have determined the
594	* mapping correctly, we prefer the second (ByType). However, if neither does
595	* then we prefer the first (ByLayout), as it produces a fuzzy result which is
596	* still likely to be partially correct.
597	*
598	* @warning not re-entrant
599	* @returns 1 if the layout found was optimal, 0 if it was not. This is
600	* for diagnostic purposes
601	* @param display a pointer to the X11 display
602	* @param byLayoutOK diagnostic - set to one if detection by layout
603	* succeeded, and to 0 otherwise
604	* @param byTypeOK diagnostic - set to one if detection by type
605	* succeeded, and to 0 otherwise
606	* @param byXkbOK diagnostic - set to one if detection using XKB
607	* succeeded, and to 0 otherwise
608	* @param remapScancode array of tuples that remap the keycode (first
609	* part) to a scancode (second part)
610	*/
611	unsigned X11DRV_InitKeyboard(Display display, unsigned byLayoutOK,
612	unsigned byTypeOK, unsigned byXkbOK,
613	int (*remapScancodes)[2])
614	{
615	unsigned byLayout, byType, byXkb;
616
617	byLayout = X11DRV_InitKeyboardByLayout(display);
618	if (byLayoutOK)
619	*byLayoutOK = byLayout;
620
621	byType = X11DRV_InitKeyboardByType(display);
622	if (byTypeOK)
623	*byTypeOK = byType;
624
625	byXkb = X11DRV_InitKeyboardByXkb(display);
626	if (byXkbOK)
627	*byXkbOK = byXkb;
628
629	/* Remap keycodes after initialization. Remapping stops after an
630	identity mapping is seen */
631	if (remapScancodes != NULL)
632	for (; (remapScancodes)[0] != (remapScancodes)[1]; remapScancodes++)
633	keyc2scan[(remapScancodes)[0]] = (remapScancodes)[1];
634
635	return (byLayout \|\| byType \|\| byXkb) ? 1 : 0;
636	}
637
638	/**
639	* Returns the keycode to scancode array
640	*/
641	unsigned *X11DRV_getKeyc2scan(void)
642	{
643	return keyc2scan;
644	}
645

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source: vbox/trunk/src/VBox/Frontends/Common/VBoxKeyboard/keyboard.c@ 33656

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