summaryrefslogtreecommitdiff
path: root/dix/inpututils.c
blob: c152b2d8b93fdc2e9d3320547e70b8801a74fc9a (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
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
/*
 * 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"
#include "eventstr.h"
#include "scrnintstr.h"
#include "optionstr.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) && GetMaster(tmp, MASTER_KEYBOARD) == dev)
                if (check_modmap_change_slave(client, dev, tmp, modmap))
                    do_modmap_change(client, tmp, modmap);
        }
    }
    else if (!IsFloating(dev) && GetMaster(dev, MASTER_KEYBOARD)->lastSlave == dev) {
        /* If this fails, expect the results to be weird. */
        if (check_modmap_change(client, dev->master, modmap))
            do_modmap_change(client, dev->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;
}

void
valuator_mask_free(ValuatorMask **mask)
{
    free(*mask);
    *mask = NULL;
}


/**
 * 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 floating-point data.
 */
void
valuator_mask_set_double(ValuatorMask *mask, int valuator, double data)
{
    mask->last_bit = max(valuator, mask->last_bit);
    SetBit(mask->mask, valuator);
    mask->valuators[valuator] = data;
}

/**
 * Set the valuator to the given integer data.
 */
void
valuator_mask_set(ValuatorMask *mask, int valuator, int data)
{
    valuator_mask_set_double(mask, valuator, data);
}

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

/**
 * Return the requested valuator value as an integer, rounding towards zero.
 * 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 trunc(valuator_mask_get_double(mask, valuator));
}

/**
 * Set value to the requested valuator. If the mask bit is set for this
 * valuator, value contains the requested valuator value and TRUE is
 * returned.
 * If the mask bit is not set for this valuator, value is unchanged and
 * FALSE is returned.
 */
Bool
valuator_mask_fetch_double(const ValuatorMask *mask, int valuator, double *value)
{
    if (valuator_mask_isset(mask, valuator))
    {
        *value = valuator_mask_get_double(mask, valuator);
        return TRUE;
    } else
        return FALSE;
}

/**
 * Set value to the requested valuator. If the mask bit is set for this
 * valuator, value contains the requested valuator value and TRUE is
 * returned.
 * If the mask bit is not set for this valuator, value is unchanged and
 * FALSE is returned.
 */
Bool
valuator_mask_fetch(const ValuatorMask *mask, int valuator, int *value)
{
    if (valuator_mask_isset(mask, valuator))
    {
        *value = valuator_mask_get(mask, valuator);
        return TRUE;
    } else
        return FALSE;
}

/**
 * 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] = 0.0;

        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;
}

/**
 * Verifies sanity of the event. If the event is not an internal event,
 * memdumps the first 32 bytes of event to the log, a backtrace, then kill
 * the server.
 */
void verify_internal_event(const InternalEvent *ev)
{
    if (ev && ev->any.header != ET_Internal)
    {
        int i;
        unsigned char *data = (unsigned char*)ev;

        ErrorF("dix: invalid event type %d\n", ev->any.header);

        for (i = 0; i < sizeof(xEvent); i++, data++)
        {
            ErrorF("%02hhx ", *data);

            if ((i % 8) == 7)
                ErrorF("\n");
        }

        xorg_backtrace();
        FatalError("Wrong event type %d. Aborting server\n", ev->any.header);
    }
}

/**
 * Initializes the given event to zero (or default values), for the given
 * device.
 */
void init_device_event(DeviceEvent *event, DeviceIntPtr dev, Time ms)
{
    memset(event, 0, sizeof(DeviceEvent));
    event->header = ET_Internal;
    event->length = sizeof(DeviceEvent);
    event->time = ms;
    event->deviceid = dev->id;
    event->sourceid = dev->id;
}

Bool
point_on_screen(ScreenPtr pScreen, int x, int y)
{
    return x >= pScreen->x && x < pScreen->x + pScreen->width &&
           y >= pScreen->y && y < pScreen->y + pScreen->height;
}

/**
 * Update desktop dimensions on the screenInfo struct.
 */
void
update_desktop_dimensions(void)
{
    int i;
    int x1 = INT_MAX, y1 = INT_MAX; /* top-left */
    int x2 = INT_MIN, y2 = INT_MIN; /* bottom-right */

    for (i = 0; i < screenInfo.numScreens; i++) {
        ScreenPtr screen = screenInfo.screens[i];
        x1 = min(x1, screen->x);
        y1 = min(y1, screen->y);
        x2 = max(x2, screen->x + screen->width);
        y2 = max(y2, screen->y + screen->height);
    }

    screenInfo.x = x1;
    screenInfo.y = y1;
    screenInfo.width = x2 - x1;
    screenInfo.height = y2 - y1;
}

/*
 * Delete the element with the key from the list, freeing all memory
 * associated with the element..
 */
static void
input_option_free(InputOption *o)
{
    free(o->opt_name);
    free(o->opt_val);
    free(o->opt_comment);
    free(o);
}

/*
 * Create a new InputOption with the key/value pair provided.
 * If a list is provided, the new options is added to the list and the list
 * is returned.
 *
 * If a new option is added to a list that already contains that option, the
 * previous option is overwritten.
 *
 * @param list The list to add to.
 * @param key Option key, will be copied.
 * @param value Option value, will be copied.
 *
 * @return If list is not NULL, the list with the new option added. If list
 * is NULL, a new option list with one element. On failure, NULL is
 * returned.
 */
InputOption*
input_option_new(InputOption* list, const char *key, const char *value)
{
    InputOption *opt = NULL;

    if (!key)
        return NULL;

    if (list)
    {
        nt_list_for_each_entry(opt, list, list.next)
        {
            if (strcmp(input_option_get_key(opt), key) == 0)
            {
                input_option_set_value(opt, value);
                return list;
            }
        }
    }

    opt = calloc(1, sizeof(InputOption));
    if (!opt)
        return NULL;

    nt_list_init(opt, list.next);
    input_option_set_key(opt, key);
    input_option_set_value(opt, value);

    if (list)
    {
        nt_list_append(opt, list, InputOption, list.next);
        return list;
    } else
        return opt;
}

InputOption*
input_option_free_element(InputOption *list, const char *key)
{
    InputOption *element;

    nt_list_for_each_entry(element, list, list.next) {
        if (strcmp(input_option_get_key(element), key) == 0) {
            nt_list_del(element, list, InputOption, list.next);
            input_option_free(element);
            break;
        }
    }
    return list;
}

/**
 * Free the list pointed at by opt.
 */
void
input_option_free_list(InputOption **opt)
{
    InputOption *element, *tmp;

    nt_list_for_each_entry_safe(element, tmp, *opt, list.next) {
        nt_list_del(element, *opt, InputOption, list.next);
        input_option_free(element);
    }
    *opt = NULL;
}


/**
 * Find the InputOption with the given option name.
 *
 * @return The InputOption or NULL if not present.
 */
InputOption*
input_option_find(InputOption *list, const char *key)
{
    InputOption *element;

    nt_list_for_each_entry(element, list, list.next) {
        if (strcmp(input_option_get_key(element), key) == 0)
            return element;
    }

    return NULL;
}

const char*
input_option_get_key(const InputOption *opt)
{
    return opt->opt_name;
}

const char*
input_option_get_value(const InputOption *opt)
{
    return opt->opt_val;
}

void
input_option_set_key(InputOption *opt, const char *key)
{
    free(opt->opt_name);
    if (key)
        opt->opt_name = strdup(key);
}

void
input_option_set_value(InputOption *opt, const char *value)
{
    free(opt->opt_val);
    if (value)
        opt->opt_val = strdup(value);
}


/* FP1616/FP3232 conversion functions.
 * Fixed point types are encoded as signed integral and unsigned frac. So any
 * negative number -n.m is encoded as floor(n) + (1 - 0.m).
 */
double
fp1616_to_double(FP1616 in)
{
    double ret;

    ret  = (double)(in >> 16);
    ret += (double)(in & 0xffff) * (1.0 / (1UL << 16)); /* Optimized: ldexp((double)(in & 0xffff), -16); */
    return ret;
}

double
fp3232_to_double(FP3232 in)
{
    double ret;
    ret  = (double)in.integral;
    ret += (double)in.frac * (1.0 / (1ULL << 32)); /* Optimized: ldexp((double)in.frac, -32); */
    return ret;
}


FP1616
double_to_fp1616(double in)
{
    FP1616 ret;
    int32_t integral;
    double tmp;
    uint32_t frac_d;

    tmp = floor(in);
    integral = (int32_t)tmp;

    tmp = (in - integral) * (1UL << 16); /* Optimized: ldexp(in - integral, 16) */
    frac_d = (uint16_t)tmp;

    ret = integral << 16;
    ret |= frac_d & 0xffff;
    return ret;
}

FP3232
double_to_fp3232(double in)
{
    FP3232 ret;
    int32_t integral;
    double tmp;
    uint32_t frac_d;

    tmp = floor(in);
    integral = (int32_t)tmp;

    tmp = (in - integral) * (1ULL << 32); /* Optimized: ldexp(in - integral, 32) */
    frac_d = (uint32_t)tmp;

    ret.integral = integral;
    ret.frac = frac_d;
    return ret;
}