aboutsummaryrefslogtreecommitdiffstats
path: root/libical/src/libicalss/icaldirset.c
blob: 4a20fe1978997194379770d3385792f80d02257f (plain) (blame)
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
/* -*- Mode: C -*-
    ======================================================================
    FILE: icaldirset.c
    CREATOR: eric 28 November 1999
  
    $Id$
    $Locker$
    
 (C) COPYRIGHT 2000, Eric Busboom, http://www.softwarestudio.org

 This program is free software; you can redistribute it and/or modify
 it under the terms of either: 

    The LGPL as published by the Free Software Foundation, version
    2.1, available at: http://www.fsf.org/copyleft/lesser.html

  Or:

    The Mozilla Public License Version 1.0. You may obtain a copy of
    the License at http://www.mozilla.org/MPL/

    The Original Code is eric. The Initial Developer of the Original
    Code is Eric Busboom


    ======================================================================*/


/**
   @file   icaldirset.c
 
   @brief  icaldirset manages a database of ical components and offers
  interfaces for reading, writting and searching for components.

  icaldirset groups components in to clusters based on their DTSTAMP
  time -- all components that start in the same month are grouped
  together in a single file. All files in a sotre are kept in a single
  directory. 

  The primary interfaces are icaldirset__get_first_component and
  icaldirset_get_next_component. These routine iterate through all of
  the components in the store, subject to the current gauge. A gauge
  is an icalcomponent that is tested against other componets for a
  match. If a gauge has been set with icaldirset_select,
  icaldirset_first and icaldirset_next will only return componentes
  that match the gauge.

  The Store generated UIDs for all objects that are stored if they do
  not already have a UID. The UID is the name of the cluster (month &
  year as MMYYYY) plus a unique serial number. The serial number is
  stored as a property of the cluster.

*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif


#include "ical.h"
#include "icaldirset.h"
#include "icaldirset.h"
#include "icalfileset.h"
#include "icalfilesetimpl.h"
#include "icalcluster.h"
#include "icalgauge.h"

#include <limits.h> /* For PATH_MAX */
#ifndef WIN32
#include <dirent.h> /* for opendir() */
#include <unistd.h> /* for stat, getpid */
#include <sys/utsname.h> /* for uname */
#else
#include <io.h>
#include <process.h>
#endif
#include <errno.h>
#include <sys/types.h> /* for opendir() */
#include <sys/stat.h> /* for stat */
#include <time.h> /* for clock() */
#include <stdlib.h> /* for rand(), srand() */
#include <string.h> /* for strdup */
#include "icaldirsetimpl.h"


#ifdef WIN32
#define snprintf    _snprintf
#define strcasecmp  stricmp

#define _S_ISTYPE(mode, mask)  (((mode) & _S_IFMT) == (mask))

#define S_ISDIR(mode)    _S_ISTYPE((mode), _S_IFDIR)
#define S_ISREG(mode)    _S_ISTYPE((mode), _S_IFREG)
#endif

/** Default options used when NULL is passed to icalset_new() **/
icaldirset_options icaldirset_options_default = {O_RDWR|O_CREAT};


const char* icaldirset_path(icalset* set)
{
  icaldirset *dset = (icaldirset*)set;

  return dset->dir;
}


void icaldirset_mark(icalset* set)
{
  icaldirset *dset = (icaldirset*)set;

  icalcluster_mark(dset->cluster);
}


icalerrorenum icaldirset_commit(icalset* set)
{
  icaldirset *dset = (icaldirset*)set;
  icalset *fileset;
  icalfileset_options options = icalfileset_options_default;

  options.cluster = dset->cluster;

  fileset = icalset_new(ICAL_FILE_SET, icalcluster_key(dset->cluster), &options);

  fileset->commit(fileset);
  fileset->free(fileset);

  return ICAL_NO_ERROR;
}

void icaldirset_lock(const char* dir)
{
}


void icaldirset_unlock(const char* dir)
{
}

/* Load the contents of the store directory into the store's internal directory list*/
icalerrorenum icaldirset_read_directory(icaldirset *dset)
{
    char *str;
#ifndef WIN32
    struct dirent *de;
    DIR* dp;
 
    dp = opendir(dset->dir);
   
    if (dp == 0) {
    icalerror_set_errno(ICAL_FILE_ERROR);
    return ICAL_FILE_ERROR;
    }

    /* clear contents of directory list */
    while((str = pvl_pop(dset->directory))){
    free(str);
    }
    
    /* load all of the cluster names in the directory list */
    for(de = readdir(dp);
    de != 0;
    de = readdir(dp)){

    /* Remove known directory names  '.' and '..'*/
    if (strcmp(de->d_name,".") == 0 ||
        strcmp(de->d_name,"..") == 0 ){
        continue;
    }

    pvl_push(dset->directory, (void*)strdup(de->d_name));   
    }

    closedir(dp);
#else
    struct _finddata_t c_file;
    long hFile;
    
    /* Find first .c file in current directory */
    if( (hFile = _findfirst( "*", &c_file )) == -1L ) {
        icalerror_set_errno(ICAL_FILE_ERROR);
        return ICAL_FILE_ERROR;
    } else {
      while((str = pvl_pop(dset->directory))){
            free(str);
        }
        
        /* load all of the cluster names in the directory list */
      do {
            /* Remove known directory names  '.' and '..'*/
            if (strcmp(c_file.name,".") == 0 ||
                strcmp(c_file.name,"..") == 0 ){
                continue;
            }
            
    pvl_push(dset->directory, (void*)strdup(c_file.name));
        }
        while ( _findnext( hFile, &c_file ) == 0 );
            
        _findclose( hFile );
    }

#endif

    return ICAL_NO_ERROR;
}


icalset* icaldirset_init(icalset* set, const char* dir, void* options_in)
{
  icaldirset *dset = (icaldirset*)set;
  icaldirset_options *options = options_in;
    struct stat sbuf;

    icalerror_check_arg_rz( (dir!=0), "dir");
  icalerror_check_arg_rz( (set!=0), "set");

    if (stat(dir,&sbuf) != 0){
    icalerror_set_errno(ICAL_FILE_ERROR);
    return 0;
    }
    
    /* dir is not the name of a direectory*/
    if (!S_ISDIR(sbuf.st_mode)){ 
    icalerror_set_errno(ICAL_USAGE_ERROR);
    return 0;
    }       

    icaldirset_lock(dir);

  dset->dir = (char*)strdup(dir);
  dset->options = *options;
  dset->directory = pvl_newlist();
  dset->directory_iterator = 0;
  dset->gauge = 0;
  dset->first_component = 0;
  dset->cluster = 0;

  return set;
}

icalset* icaldirset_new(const char* dir)
{
  return icalset_new(ICAL_DIR_SET, dir, &icaldirset_options_default);
}

    
icalset* icaldirset_new_reader(const char* dir)
{
  icaldirset_options reader_options = icaldirset_options_default;

  reader_options.flags = O_RDONLY;

  return icalset_new(ICAL_DIR_SET, dir, &reader_options);
}

    
icalset* icaldirset_new_writer(const char* dir)
{
  icaldirset_options writer_options = icaldirset_options_default;

  writer_options.flags = O_RDWR|O_CREAT;

  return icalset_new(ICAL_DIR_SET, dir, &writer_options);
}


void icaldirset_free(icalset* s)
{
  icaldirset *dset = (icaldirset*)s;
    char* str;

  icaldirset_unlock(dset->dir);

  if(dset->dir !=0){
    free(dset->dir);
    dset->dir = 0;
    }

  if(dset->gauge !=0){
    icalgauge_free(dset->gauge);
    dset->gauge = 0;
    }

  if(dset->cluster !=0){
    icalcluster_free(dset->cluster);
    }

  while(dset->directory !=0 &&  (str=pvl_pop(dset->directory)) != 0){
    free(str);
    }

  if(dset->directory != 0){
    pvl_free(dset->directory);
    dset->directory = 0;
    }

  dset->directory_iterator = 0;
  dset->first_component = 0;
}


/* icaldirset_next_uid_number updates a serial number in the Store
   directory in a file called SEQUENCE */

int icaldirset_next_uid_number(icaldirset* dset)
{
    char sequence = 0;
    char temp[128];
    char filename[ICAL_PATH_MAX];
    char *r;
    FILE *f;
    struct stat sbuf;

    icalerror_check_arg_rz( (dset!=0), "dset");

    sprintf(filename,"%s/%s",dset->dir,"SEQUENCE");

    /* Create the file if it does not exist.*/
    if (stat(filename,&sbuf) == -1 || !S_ISREG(sbuf.st_mode)){

    f = fopen(filename,"w");
    if (f != 0){
        fprintf(f,"0");
        fclose(f);
    } else {
        icalerror_warn("Can't create SEQUENCE file in icaldirset_next_uid_number");
        return 0;
    }
    }
    
    if ( (f = fopen(filename,"r+")) != 0){

    rewind(f);
    r = fgets(temp,128,f);

    if (r == 0){
        sequence = 1;
    } else {
        sequence = atoi(temp)+1;
    }

    rewind(f);

    fprintf(f,"%d",sequence);

    fclose(f);

    return sequence;
    
    } else {
    icalerror_warn("Can't create SEQUENCE file in icaldirset_next_uid_number");
    return 0;
    }
}

icalerrorenum icaldirset_next_cluster(icaldirset* dset)
{
    char path[ICAL_PATH_MAX];

    if (dset->directory_iterator == 0){
    icalerror_set_errno(ICAL_INTERNAL_ERROR);
    return ICAL_INTERNAL_ERROR;
    }       
    dset->directory_iterator = pvl_next(dset->directory_iterator);

    if (dset->directory_iterator == 0){
    /* There are no more clusters */
    if(dset->cluster != 0){
        icalcluster_free(dset->cluster);
        dset->cluster = 0;
    }
    return ICAL_NO_ERROR;
    }
        
    sprintf(path,"%s/%s", dset->dir,(char*)pvl_data(dset->directory_iterator));

    icalcluster_free(dset->cluster);
    dset->cluster = icalfileset_produce_icalcluster(path);

    return icalerrno;
}

static void icaldirset_add_uid(icalcomponent* comp)
{
    char uidstring[ICAL_PATH_MAX];
    icalproperty *uid;
#ifndef WIN32
    struct utsname unamebuf;
#endif

    icalerror_check_arg_rv( (comp!=0), "comp");

    uid = icalcomponent_get_first_property(comp,ICAL_UID_PROPERTY);
    
    if (uid == 0) {
    
#ifndef WIN32
    uname(&unamebuf);
    
    sprintf(uidstring,"%d-%s",(int)getpid(),unamebuf.nodename);
#else
    sprintf(uidstring,"%d-%s",(int)getpid(),"WINDOWS");  /* FIX: There must be an easy get the system name */
#endif
    
    uid = icalproperty_new_uid(uidstring);
    icalcomponent_add_property(comp,uid);
    } else {
    strcpy(uidstring,icalproperty_get_uid(uid));
    }
}


/**
  This assumes that the top level component is a VCALENDAR, and there
   is an inner component of type VEVENT, VTODO or VJOURNAL. The inner
  component must have a DSTAMP property 
*/

icalerrorenum icaldirset_add_component(icalset* set, icalcomponent* comp)
{
    char clustername[ICAL_PATH_MAX];
    icalproperty *dt = 0;
    icalvalue *v;
    struct icaltimetype tm;
    icalerrorenum error = ICAL_NO_ERROR;
    icalcomponent *inner;
    icaldirset *dset = (icaldirset*) set;

    icalerror_check_arg_rz( (dset!=0), "dset");
    icalerror_check_arg_rz( (comp!=0), "comp");

    icaldirset_add_uid(comp);

    /* Determine which cluster this object belongs in. This is a HACK */

    for(inner = icalcomponent_get_first_component(comp,ICAL_ANY_COMPONENT);
    inner != 0;
    inner = icalcomponent_get_next_component(comp,ICAL_ANY_COMPONENT)){
  
    dt = icalcomponent_get_first_property(inner,ICAL_DTSTAMP_PROPERTY);
    
      if (dt != 0)
        break; 
    }   

    if (dt == 0) {
    for(inner = icalcomponent_get_first_component(comp,ICAL_ANY_COMPONENT);
        inner != 0;
        inner = icalcomponent_get_next_component(comp,ICAL_ANY_COMPONENT)){
        
        dt = icalcomponent_get_first_property(inner,ICAL_DTSTART_PROPERTY);
        
      if (dt != 0)
        break; 
        }   
    }

    if (dt == 0){
    icalerror_warn("The component does not have a DTSTAMP or DTSTART property, so it cannot be added to the store");
    icalerror_set_errno(ICAL_BADARG_ERROR);
    return ICAL_BADARG_ERROR;
    }

    v = icalproperty_get_value(dt);
    tm = icalvalue_get_datetime(v);

    snprintf(clustername,ICAL_PATH_MAX,"%s/%04d%02d",dset->dir, tm.year, tm.month);

    /* Load the cluster and insert the object */
    if(dset->cluster != 0 && 
       strcmp(clustername,icalcluster_key(dset->cluster)) != 0 ){
      icalcluster_free(dset->cluster);
      dset->cluster = 0;
    }

    if (dset->cluster == 0){
      dset->cluster = icalfileset_produce_icalcluster(clustername);

      if (dset->cluster == 0){
        error = icalerrno;
    }
    }
    
    if (error != ICAL_NO_ERROR){
    icalerror_set_errno(error);
    return error;
    }

    /* Add the component to the cluster */
    icalcluster_add_component(dset->cluster,comp);
    
    /* icalcluster_mark(impl->cluster); */

    return ICAL_NO_ERROR;    
}

/**
   Remove a component in the current cluster. HACK. This routine is a
   "friend" of icalfileset, and breaks its encapsulation. It was
   either do it this way, or add several layers of interfaces that had
   no other use.  
 */

icalerrorenum icaldirset_remove_component(icalset* set, icalcomponent* comp)
{
    icaldirset *dset = (icaldirset*)set;
    icalcomponent *filecomp = icalcluster_get_component(dset->cluster);

    icalcompiter i;
    int found = 0;

    icalerror_check_arg_re((set!=0),"set",ICAL_BADARG_ERROR);
    icalerror_check_arg_re((comp!=0),"comp",ICAL_BADARG_ERROR);
    icalerror_check_arg_re((dset->cluster!=0),"Cluster pointer",ICAL_USAGE_ERROR);

    for(i = icalcomponent_begin_component(filecomp,ICAL_ANY_COMPONENT);
    icalcompiter_deref(&i)!= 0; icalcompiter_next(&i)){
    
    icalcomponent *this = icalcompiter_deref(&i);

    if (this == comp){
        found = 1;
        break;
    }
    }

    if (found != 1){
    icalerror_warn("icaldirset_remove_component: component is not part of current cluster");
    icalerror_set_errno(ICAL_USAGE_ERROR);
    return ICAL_USAGE_ERROR;
    }

    icalcluster_remove_component(dset->cluster,comp);

    /* icalcluster_mark(impl->cluster); */

    /* If the removal emptied the fileset, get the next fileset */
    if( icalcluster_count_components(dset->cluster,ICAL_ANY_COMPONENT)==0){
      icalerrorenum error = icaldirset_next_cluster(dset);

      if(dset->cluster != 0 && error == ICAL_NO_ERROR){
    icalcluster_get_first_component(dset->cluster);
    } else {
        /* HACK. Not strictly correct for impl->cluster==0 */
        return error;
    }
    } else {
    /* Do nothing */
    }

    return ICAL_NO_ERROR;
}



int icaldirset_count_components(icalset* store,
                   icalcomponent_kind kind)
{
    /* HACK, not implemented */
    assert(0);

    return 0;
}


icalcomponent* icaldirset_fetch_match(icalset* set, icalcomponent *c)
{
    fprintf(stderr," icaldirset_fetch_match is not implemented\n");
    assert(0);
    return 0;
}


icalcomponent* icaldirset_fetch(icalset* set, const char* uid)
{
    icaldirset *dset = (icaldirset*)set;
    icalgauge *gauge;
    icalgauge *old_gauge;
    icalcomponent *c;
    char sql[256];

    icalerror_check_arg_rz( (set!=0), "set");
    icalerror_check_arg_rz( (uid!=0), "uid");

    snprintf(sql, 256, "SELECT * FROM VEVENT WHERE UID = \"%s\"", uid);
    
    gauge = icalgauge_new_from_sql(sql, 0);

    old_gauge = dset->gauge;
    dset->gauge = gauge;

    c= icaldirset_get_first_component(set);

    dset->gauge = old_gauge;

    icalgauge_free(gauge);

    return c;
}


int icaldirset_has_uid(icalset* set, const char* uid)
{
    icalcomponent *c;

    icalerror_check_arg_rz( (set!=0), "set");
    icalerror_check_arg_rz( (uid!=0), "uid");
    
    /* HACK. This is a temporary implementation. _has_uid should use a
       database, and _fetch should use _has_uid, not the other way
       around */
    c = icaldirset_fetch(set,uid);

    return c!=0;

}


icalerrorenum icaldirset_select(icalset* set, icalgauge* gauge)
{
  icaldirset *dset = (icaldirset*)set;

  icalerror_check_arg_re( (set!=0), "set",ICAL_BADARG_ERROR);
    icalerror_check_arg_re( (gauge!=0), "gauge",ICAL_BADARG_ERROR);

  dset->gauge = gauge;

    return ICAL_NO_ERROR;
}


icalerrorenum icaldirset_modify(icalset* set, 
                icalcomponent *old,
                   icalcomponent *new)
{
    assert(0);
    return ICAL_NO_ERROR; /* HACK, not implemented */

}


void icaldirset_clear(icalset* set)
{

    assert(0);
    return;
    /* HACK, not implemented */
}

icalcomponent* icaldirset_get_current_component(icalset* set)
{
  icaldirset *dset = (icaldirset*)set;

  if (dset->cluster == 0){
    icaldirset_get_first_component(set);
    }
  if(dset->cluster == 0){
    return 0;
    }

  return icalcluster_get_current_component(dset->cluster);
}


icalcomponent* icaldirset_get_first_component(icalset* set)
{
  icaldirset *dset = (icaldirset*)set;

    icalerrorenum error;
    char path[ICAL_PATH_MAX];

  error = icaldirset_read_directory(dset);

    if (error != ICAL_NO_ERROR){
    icalerror_set_errno(error);
    return 0;
    }

  dset->directory_iterator = pvl_head(dset->directory);
    
  if (dset->directory_iterator == 0){
    icalerror_set_errno(error);
    return 0;
    }
    
  snprintf(path,ICAL_PATH_MAX,"%s/%s",
       dset->dir,
       (char*)pvl_data(dset->directory_iterator));

    /* If the next cluster we need is different than the current cluster, 
       delete the current one and get a new one */

  if(dset->cluster != 0 && strcmp(path,icalcluster_key(dset->cluster)) != 0 ){
    icalcluster_free(dset->cluster);
    dset->cluster = 0;
    }
    
  if (dset->cluster == 0){
    dset->cluster = icalfileset_produce_icalcluster(path);

    if (dset->cluster == 0){
        error = icalerrno;
    }
    } 

    if (error != ICAL_NO_ERROR){
    icalerror_set_errno(error);
    return 0;
    }

  dset->first_component = 1;

  return icaldirset_get_next_component(set);
}


icalcomponent* icaldirset_get_next_component(icalset* set)
{
  icaldirset *dset = (icaldirset*)set;
    icalcomponent *c;
    icalerrorenum error;

  icalerror_check_arg_rz( (set!=0), "set");


  if(dset->cluster == 0){
    icalerror_warn("icaldirset_get_next_component called with a NULL cluster (Caller must call icaldirset_get_first_component first");
    icalerror_set_errno(ICAL_USAGE_ERROR);
    return 0;

    }

    /* Set the component iterator for the following for loop */
  if (dset->first_component == 1){
    icalcluster_get_first_component(dset->cluster);
    dset->first_component = 0;
    } else {
    icalcluster_get_next_component(dset->cluster);
    }

    while(1){
    /* Iterate through all of the objects in the cluster*/
    for( c = icalcluster_get_current_component(dset->cluster);
         c != 0;
     c = icalcluster_get_next_component(dset->cluster)){
        
        /* If there is a gauge defined and the component does not
           pass the gauge, skip the rest of the loop */

      if (dset->gauge != 0 && icalgauge_compare(dset->gauge,c) == 0){
        continue;
        }

        /* Either there is no gauge, or the component passed the
           gauge, so return it*/

        return c;
    }

    /* Fell through the loop, so the component we want is not
       in this cluster. Load a new cluster and try again.*/

    error = icaldirset_next_cluster(dset);

    if(dset->cluster == 0 || error != ICAL_NO_ERROR){
        /* No more clusters */
        return 0;
    } else {
      c = icalcluster_get_first_component(dset->cluster);

        return c;
    }
    
    }

    return 0; /* Should never get here */
}

icalsetiter icaldirset_begin_component(icalset* set, icalcomponent_kind kind, icalgauge* gauge)
{
    icalsetiter itr = icalsetiter_null;
    icaldirset *fset = (icaldirset*) set;

    icalerror_check_arg_re((fset!=0), "set", icalsetiter_null);

    itr.iter.kind = kind;
    itr.gauge = gauge;

    /* TO BE IMPLEMENTED */
    return icalsetiter_null;
}

icalcomponent* icaldirsetiter_to_next(icalset* set, icalsetiter* i)
{
    /* TO BE IMPLEMENTED */
    return NULL;
}

icalcomponent* icaldirsetiter_to_prior(icalset* set, icalsetiter* i)
{
    /* TO BE IMPLEMENTED */
    return NULL;
}