summaryrefslogtreecommitdiff
path: root/dix/inpututils.c
blob: 2877804d6b753146356431ec26a63f2b2640e702 (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
/*
 * Copyright © 2008 Daniel Stone
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Author: Daniel Stone <daniel@fooishbar.org>
 */

#ifdef HAVE_DIX_CONFIG_H
#include "dix-config.h"
#endif

#include "exevents.h"
#include "exglobals.h"
#include "misc.h"
#include "input.h"
#include "inputstr.h"
#include "xace.h"
#include "xkbsrv.h"
#include "xkbstr.h"
#include "inpututils.h"

/* Check if a button map change is okay with the device.
 * Returns -1 for BadValue, as it collides with MappingBusy. */
static int
check_butmap_change(DeviceIntPtr dev, CARD8 *map, int len, CARD32 *errval_out,
                    ClientPtr client)
{
    int i, ret;

    if (!dev || !dev->button)
    {
        client->errorValue = (dev) ? dev->id : 0;
        return BadDevice;
    }

    ret = XaceHook(XACE_DEVICE_ACCESS, client, dev, DixManageAccess);
    if (ret != Success)
    {
        client->errorValue = dev->id;
        return ret;
    }

    for (i = 0; i < len; i++) {
        if (dev->button->map[i + 1] != map[i] && dev->button->down[i + 1])
            return MappingBusy;
    }

    return Success;
}

static void
do_butmap_change(DeviceIntPtr dev, CARD8 *map, int len, ClientPtr client)
{
    int i;
    xEvent core_mn;
    deviceMappingNotify xi_mn;

    /* The map in ButtonClassRec refers to button numbers, whereas the
     * protocol is zero-indexed.  Sigh. */
    memcpy(&(dev->button->map[1]), map, len);

    core_mn.u.u.type = MappingNotify;
    core_mn.u.mappingNotify.request = MappingPointer;

    /* 0 is the server client. */
    for (i = 1; i < currentMaxClients; i++) {
        /* Don't send irrelevant events to naïve clients. */
        if (!clients[i] || clients[i]->clientState != ClientStateRunning)
            continue;

        if (!XIShouldNotify(clients[i], dev))
            continue;

        WriteEventsToClient(clients[i], 1, &core_mn);
    }

    xi_mn.type = DeviceMappingNotify;
    xi_mn.request = MappingPointer;
    xi_mn.deviceid = dev->id;
    xi_mn.time = GetTimeInMillis();

    SendEventToAllWindows(dev, DeviceMappingNotifyMask, (xEvent *) &xi_mn, 1);
}

/*
 * Does what it says on the box, both for core and Xi.
 *
 * Faithfully reports any errors encountered while trying to apply the map
 * to the requested device, faithfully ignores any errors encountered while
 * trying to apply the map to its master/slaves.
 */
int
ApplyPointerMapping(DeviceIntPtr dev, CARD8 *map, int len, ClientPtr client)
{
    int ret;

    /* If we can't perform the change on the requested device, bail out. */
    ret = check_butmap_change(dev, map, len, &client->errorValue, client);
    if (ret != Success)
        return ret;
    do_butmap_change(dev, map, len, client);

    return Success;
}

/* Check if a modifier map change is okay with the device.
 * Returns -1 for BadValue, as it collides with MappingBusy; this particular
 * caveat can be removed with LegalModifier, as we have no other reason to
 * set MappingFailed.  Sigh. */
static int
check_modmap_change(ClientPtr client, DeviceIntPtr dev, KeyCode *modmap)
{
    int ret, i;
    XkbDescPtr xkb;

    ret = XaceHook(XACE_DEVICE_ACCESS, client, dev, DixManageAccess);
    if (ret != Success)
        return ret;

    if (!dev->key)
        return BadMatch;
    xkb = dev->key->xkbInfo->desc;

    for (i = 0; i < MAP_LENGTH; i++) {
        if (!modmap[i])
            continue;

        /* Check that all the new modifiers fall within the advertised
         * keycode range. */
        if (i < xkb->min_key_code || i > xkb->max_key_code) {
            client->errorValue = i;
            return -1;
        }

        /* Make sure the mapping is okay with the DDX. */
        if (!LegalModifier(i, dev)) {
            client->errorValue = i;
            return MappingFailed;
        }

        /* None of the new modifiers may be down while we change the
         * map. */
        if (key_is_down(dev, i, KEY_POSTED | KEY_PROCESSED)) {
            client->errorValue = i;
            return MappingBusy;
        }
    }

    /* None of the old modifiers may be down while we change the map,
     * either. */
    for (i = xkb->min_key_code; i < xkb->max_key_code; i++) {
        if (!xkb->map->modmap[i])
            continue;
        if (key_is_down(dev, i, KEY_POSTED | KEY_PROCESSED)) {
            client->errorValue = i;
            return MappingBusy;
        }
    }

    return Success;
}

static int
check_modmap_change_slave(ClientPtr client, DeviceIntPtr master,
                          DeviceIntPtr slave, CARD8 *modmap)
{
    XkbDescPtr master_xkb, slave_xkb;
    int i, j;

    if (!slave->key || !master->key)
        return 0;

    master_xkb = master->key->xkbInfo->desc;
    slave_xkb = slave->key->xkbInfo->desc;

    /* Ignore devices with a clearly different keymap. */
    if (slave_xkb->min_key_code != master_xkb->min_key_code ||
        slave_xkb->max_key_code != master_xkb->max_key_code)
        return 0;

    for (i = 0; i < MAP_LENGTH; i++) {
        if (!modmap[i])
            continue;

        /* If we have different symbols for any modifier on an
         * extended keyboard, ignore the whole remap request. */
        for (j = 0;
             j < XkbKeyNumSyms(slave_xkb, i) &&
              j < XkbKeyNumSyms(master_xkb, i);
             j++)
            if (XkbKeySymsPtr(slave_xkb, i)[j] != XkbKeySymsPtr(master_xkb, i)[j])
                return 0;
    }

    if (check_modmap_change(client, slave, modmap) != Success)
        return 0;

    return 1;
}

/* Actually change the modifier map, and send notifications.  Cannot fail. */
static void
do_modmap_change(ClientPtr client, DeviceIntPtr dev, CARD8 *modmap)
{
    XkbApplyMappingChange(dev, NULL, 0, 0, modmap, serverClient);
}

/* Rebuild modmap (key -> mod) from map (mod -> key). */
static int build_modmap_from_modkeymap(CARD8 *modmap, KeyCode *modkeymap,
                                       int max_keys_per_mod)
{
    int i, len = max_keys_per_mod * 8;

    memset(modmap, 0, MAP_LENGTH);

    for (i = 0; i < len; i++) {
        if (!modkeymap[i])
            continue;

        if (modkeymap[i] >= MAP_LENGTH)
            return BadValue;

        if (modmap[modkeymap[i]])
            return BadValue;

        modmap[modkeymap[i]] = 1 << (i / max_keys_per_mod);
    }

    return Success;
}

int
change_modmap(ClientPtr client, DeviceIntPtr dev, KeyCode *modkeymap,
              int max_keys_per_mod)
{
    int ret;
    CARD8 modmap[MAP_LENGTH];
    DeviceIntPtr tmp;

    ret = build_modmap_from_modkeymap(modmap, modkeymap, max_keys_per_mod);
    if (ret != Success)
        return ret;

    /* If we can't perform the change on the requested device, bail out. */
    ret = check_modmap_change(client, dev, modmap);
    if (ret != Success)
        return ret;
    do_modmap_change(client, dev, modmap);

    /* Change any attached masters/slaves. */
    if (IsMaster(dev)) {
        for (tmp = inputInfo.devices; tmp; tmp = tmp->next) {
            if (!IsMaster(tmp) && tmp->u.master == dev)
                if (check_modmap_change_slave(client, dev, tmp, modmap))
                    do_modmap_change(client, tmp, modmap);
        }
    }
    else if (dev->u.master && dev->u.master->u.lastSlave == dev) {
        /* If this fails, expect the results to be weird. */
        if (check_modmap_change(client, dev->u.master, modmap))
            do_modmap_change(client, dev->u.master, modmap);
    }

    return Success;
}

int generate_modkeymap(ClientPtr client, DeviceIntPtr dev,
                       KeyCode **modkeymap_out, int *max_keys_per_mod_out)
{
    CARD8 keys_per_mod[8];
    int max_keys_per_mod;
    KeyCode *modkeymap = NULL;
    int i, j, ret;

    ret = XaceHook(XACE_DEVICE_ACCESS, client, dev, DixGetAttrAccess);
    if (ret != Success)
        return ret;

    if (!dev->key)
        return BadMatch;

    /* Count the number of keys per modifier to determine how wide we
     * should make the map. */
    max_keys_per_mod = 0;
    for (i = 0; i < 8; i++)
        keys_per_mod[i] = 0;
    for (i = 8; i < MAP_LENGTH; i++) {
        for (j = 0; j < 8; j++) {
            if (dev->key->xkbInfo->desc->map->modmap[i] & (1 << j)) {
                if (++keys_per_mod[j] > max_keys_per_mod)
                    max_keys_per_mod = keys_per_mod[j];
            }
        }
    }

    if (max_keys_per_mod != 0) {
        modkeymap = calloc(max_keys_per_mod * 8, sizeof(KeyCode));
        if (!modkeymap)
            return BadAlloc;

        for (i = 0; i < 8; i++)
            keys_per_mod[i] = 0;

        for (i = 8; i < MAP_LENGTH; i++) {
            for (j = 0; j < 8; j++) {
                if (dev->key->xkbInfo->desc->map->modmap[i] & (1 << j)) {
                    modkeymap[(j * max_keys_per_mod) + keys_per_mod[j]] = i;
                    keys_per_mod[j]++;
                }
            }
        }
    }

    *max_keys_per_mod_out = max_keys_per_mod;
    *modkeymap_out = modkeymap;

    return Success;
}

/**
 * Duplicate the InputAttributes in the most obvious way.
 * No special memory handling is used to give drivers the maximum
 * flexibility with the data. Drivers should be able to call realloc on the
 * product string if needed and perform similar operations.
 */
InputAttributes*
DuplicateInputAttributes(InputAttributes *attrs)
{
    InputAttributes *new_attr;
    int ntags = 0;
    char **tags, **new_tags;

    if (!attrs)
        return NULL;

    if (!(new_attr = calloc(1, sizeof(InputAttributes))))
        goto unwind;

    if (attrs->product && !(new_attr->product = strdup(attrs->product)))
        goto unwind;
    if (attrs->vendor && !(new_attr->vendor = strdup(attrs->vendor)))
        goto unwind;
    if (attrs->device && !(new_attr->device = strdup(attrs->device)))
        goto unwind;
    if (attrs->pnp_id && !(new_attr->pnp_id = strdup(attrs->pnp_id)))
        goto unwind;
    if (attrs->usb_id && !(new_attr->usb_id = strdup(attrs->usb_id)))
        goto unwind;

    new_attr->flags = attrs->flags;

    if ((tags = attrs->tags))
    {
        while(*tags++)
            ntags++;

        new_attr->tags = calloc(ntags + 1, sizeof(char*));
        if (!new_attr->tags)
            goto unwind;

        tags = attrs->tags;
        new_tags = new_attr->tags;

        while(*tags)
        {
            *new_tags = strdup(*tags);
            if (!*new_tags)
                goto unwind;

            tags++;
            new_tags++;
        }
    }

    return new_attr;

unwind:
    FreeInputAttributes(new_attr);
    return NULL;
}

void
FreeInputAttributes(InputAttributes *attrs)
{
    char **tags;

    if (!attrs)
        return;

    free(attrs->product);
    free(attrs->vendor);
    free(attrs->device);
    free(attrs->pnp_id);
    free(attrs->usb_id);

    if ((tags = attrs->tags))
        while(*tags)
            free(*tags++);

    free(attrs->tags);
    free(attrs);
}

/**
 * Alloc a valuator mask large enough for num_valuators.
 */
ValuatorMask*
valuator_mask_new(int num_valuators)
{
    /* alloc a fixed size mask for now and ignore num_valuators. in the
     * flying-car future, when we can dynamically alloc the masks and are
     * not constrained by signals, we can start using num_valuators */
    ValuatorMask *mask = calloc(1, sizeof(ValuatorMask));
    mask->last_bit = -1;
    return mask;
}

/**
 * Sets a range of valuators between first_valuator and num_valuators with
 * the data in the valuators array. All other values are set to 0.
 */
void
valuator_mask_set_range(ValuatorMask *mask, int first_valuator, int num_valuators,
                        const int* valuators)
{
    int i;

    valuator_mask_zero(mask);

    for (i = first_valuator; i < min(first_valuator + num_valuators, MAX_VALUATORS); i++)
        valuator_mask_set(mask, i, valuators[i - first_valuator]);
}

/**
 * Reset mask to zero.
 */
void
valuator_mask_zero(ValuatorMask *mask)
{
    memset(mask, 0, sizeof(*mask));
    mask->last_bit = -1;
}

/**
 * Returns the current size of the mask (i.e. the highest number of
 * valuators currently set + 1).
 */
int
valuator_mask_size(const ValuatorMask *mask)
{
    return mask->last_bit + 1;
}

/**
 * Returns the number of valuators set in the given mask.
 */
int
valuator_mask_num_valuators(const ValuatorMask *mask)
{
    return CountBits(mask->mask, min(mask->last_bit + 1, MAX_VALUATORS));
}

/**
 * Return true if the valuator is set in the mask, or false otherwise.
 */
int
valuator_mask_isset(const ValuatorMask *mask, int valuator)
{
    return mask->last_bit >= valuator && BitIsOn(mask->mask, valuator);
}

/**
 * Set the valuator to the given data.
 */
void
valuator_mask_set(ValuatorMask *mask, int valuator, int data)
{
    mask->last_bit = max(valuator, mask->last_bit);
    SetBit(mask->mask, valuator);
    mask->valuators[valuator] = data;
}

/**
 * Return the requested valuator value. If the mask bit is not set for the
 * given valuator, the returned value is undefined.
 */
int
valuator_mask_get(const ValuatorMask *mask, int valuator)
{
    return mask->valuators[valuator];
}

/**
 * Remove the valuator from the mask.
 */
void
valuator_mask_unset(ValuatorMask *mask, int valuator)
{
    if (mask->last_bit >= valuator) {
        int i, lastbit = -1;

        ClearBit(mask->mask, valuator);
        mask->valuators[valuator] = 0;

        for (i = 0; i <= mask->last_bit; i++)
            if (valuator_mask_isset(mask, i))
                lastbit = max(lastbit, i);
        mask->last_bit = lastbit;
    }
}

void
valuator_mask_copy(ValuatorMask *dest, const ValuatorMask *src)
{
    if (src)
        memcpy(dest, src, sizeof(*dest));
    else
        valuator_mask_zero(dest);
}

int
CountBits(const uint8_t *mask, int len)
{
    int i;
    int ret = 0;

    for (i = 0; i < len; i++)
        if (BitIsOn(mask, i))
            ret++;

    return ret;
}