summaryrefslogtreecommitdiff
path: root/src/common/db.h
blob: f5714ceaf5e6a3388fd543ab48d347f5616f7aec (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
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
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
/*****************************************************************************\
 *  Copyright (c) Athena Dev Teams - Licensed under GNU GPL                  *
 *  For more information, see LICENCE in the main folder                     *
 *                                                                           *
 *  This file is separated in two sections:                                  *
 *  (1) public typedefs, enums, unions, structures and defines               *
 *  (2) public functions                                                     *
 *                                                                           *
 *  <B>Notes on the release system:</B>                                      *
 *  Whenever an entry is removed from the database both the key and the      *
 *  data are requested to be released.                                       *
 *  At least one entry is removed when replacing an entry, removing an       *
 *  entry, clearing the database or destroying the database.                 *
 *  What is actually released is defined by the release function, the        *
 *  functions of the database only ask for the key and/or data to be         *
 *  released.                                                                *
 *                                                                           *
 *  TODO:                                                                    *
 *  - create a custom database allocator                                     *
 *  - see what functions need or should be added to the database interface   *
 *                                                                           *
 *  HISTORY:                                                                 *
 *    2013/08/25 - Added int64/uint64 support for keys                       *
 *    2012/03/09 - Added enum for data types (int, uint, void*)              *
 *    2007/11/09 - Added an iterator to the database.                        *
 *    2.1 (Athena build #???#) - Portability fix                             *
 *      - Fixed the portability of casting to union and added the functions  *
 *        {@link DBMap#ensure(DBMap,DBKey,DBCreateData,...)} and             *
 *        {@link DBMap#clear(DBMap,DBApply,...)}.                            *
 *    2.0 (Athena build 4859) - Transition version                           *
 *      - Almost everything recoded with a strategy similar to objects,      *
 *        database structure is maintained.                                  *
 *    1.0 (up to Athena build 4706)                                          *
 *      - Previous database system.                                          *
 *                                                                           *
 * @version 2.1 (Athena build #???#) - Portability fix                       *
 * @author (Athena build 4859) Flavio @ Amazon Project                       *
 * @author (up to Athena build 4706) Athena Dev Teams                        *
 * @encoding US-ASCII                                                        *
 * @see common#db.c                                                          *
\*****************************************************************************/
#ifndef _COMMON_DB_H_
#define _COMMON_DB_H_

#include <stdarg.h>

#include "../common/cbasetypes.h"

/*****************************************************************************\
 *  (1) Section with public typedefs, enums, unions, structures and defines. *
 *  DBRelease    - Enumeration of release options.                           *
 *  DBType       - Enumeration of database types.                            *
 *  DBOptions    - Bitfield enumeration of database options.                 *
 *  DBKey        - Union of used key types.                                  *
 *  DBDataType   - Enumeration of data types.                                *
 *  DBData       - Struct for used data types.                               *
 *  DBApply      - Format of functions applied to the databases.             *
 *  DBMatcher    - Format of matchers used in DBMap::getall.                 *
 *  DBComparator - Format of the comparators used by the databases.          *
 *  DBHasher     - Format of the hashers used by the databases.              *
 *  DBReleaser   - Format of the releasers used by the databases.            *
 *  DBIterator   - Database iterator.                                        *
 *  DBMap        - Database interface.                                       *
\*****************************************************************************/

/**
 * Bitfield with what should be released by the releaser function (if the
 * function supports it).
 * @public
 * @see #DBReleaser
 * @see #db_custom_release(DBRelease)
 */
typedef enum DBRelease {
	DB_RELEASE_NOTHING = 0,
	DB_RELEASE_KEY     = 1,
	DB_RELEASE_DATA    = 2,
	DB_RELEASE_BOTH    = 3
} DBRelease;

/**
 * Supported types of database.
 * See {@link #db_fix_options(DBType,DBOptions)} for restrictions of the
 * types of databases.
 * @param DB_INT Uses int's for keys
 * @param DB_UINT Uses unsigned int's for keys
 * @param DB_STRING Uses strings for keys.
 * @param DB_ISTRING Uses case insensitive strings for keys.
 * @param DB_INT64 Uses int64's for keys
 * @param DB_UINT64 Uses uint64's for keys
 * @public
 * @see #DBOptions
 * @see #DBKey
 * @see #db_fix_options(DBType,DBOptions)
 * @see #db_default_cmp(DBType)
 * @see #db_default_hash(DBType)
 * @see #db_default_release(DBType,DBOptions)
 * @see #db_alloc(const char *,int,DBType,DBOptions,unsigned short)
 */
typedef enum DBType {
	DB_INT,
	DB_UINT,
	DB_STRING,
	DB_ISTRING,
	DB_INT64,
	DB_UINT64,
} DBType;

/**
 * Bitfield of options that define the behaviour of the database.
 * See {@link #db_fix_options(DBType,DBOptions)} for restrictions of the
 * types of databases.
 * @param DB_OPT_BASE Base options: does not duplicate keys, releases nothing
 *          and does not allow NULL keys or NULL data.
 * @param DB_OPT_DUP_KEY Duplicates the keys internally. If DB_OPT_RELEASE_KEY
 *          is defined, the real key is freed as soon as the entry is added.
 * @param DB_OPT_RELEASE_KEY Releases the key.
 * @param DB_OPT_RELEASE_DATA Releases the data whenever an entry is removed
 *          from the database.
 *          WARNING: for funtions that return the data (like DBMap::remove),
 *          a dangling pointer will be returned.
 * @param DB_OPT_RELEASE_BOTH Releases both key and data.
 * @param DB_OPT_ALLOW_NULL_KEY Allow NULL keys in the database.
 * @param DB_OPT_ALLOW_NULL_DATA Allow NULL data in the database.
 * @public
 * @see #db_fix_options(DBType,DBOptions)
 * @see #db_default_release(DBType,DBOptions)
 * @see #db_alloc(const char *,int,DBType,DBOptions,unsigned short)
 */
typedef enum DBOptions {
	DB_OPT_BASE            = 0,
	DB_OPT_DUP_KEY         = 1,
	DB_OPT_RELEASE_KEY     = 2,
	DB_OPT_RELEASE_DATA    = 4,
	DB_OPT_RELEASE_BOTH    = 6,
	DB_OPT_ALLOW_NULL_KEY  = 8,
	DB_OPT_ALLOW_NULL_DATA = 16,
} DBOptions;

/**
 * Union of key types used by the database.
 * @param i Type of key for DB_INT databases
 * @param ui Type of key for DB_UINT databases
 * @param str Type of key for DB_STRING and DB_ISTRING databases
 * @public
 * @see #DBType
 * @see DBMap#get
 * @see DBMap#put
 * @see DBMap#remove
 */
typedef union DBKey {
	int i;
	unsigned int ui;
	const char *str;
	int64 i64;
	uint64 ui64;
} DBKey;

/**
 * Supported types of database data.
 * @param DB_DATA_INT Uses ints for data.
 * @param DB_DATA_UINT Uses unsigned ints for data.
 * @param DB_DATA_PTR Uses void pointers for data.
 * @public
 * @see #DBData
 */
typedef enum DBDataType {
	DB_DATA_INT,
	DB_DATA_UINT,
	DB_DATA_PTR,
} DBDataType;

/**
 * Struct for data types used by the database.
 * @param type Type of data
 * @param u Union of available data types
 * @param u.i Data of int type
 * @param u.ui Data of unsigned int type
 * @param u.ptr Data of void* type
 * @public
 */
typedef struct DBData {
	DBDataType type;
	union {
		int i;
		unsigned int ui;
		void *ptr;
	} u;
} DBData;

/**
 * Format of functions that create the data for the key when the entry doesn't
 * exist in the database yet.
 * @param key Key of the database entry
 * @param args Extra arguments of the function
 * @return Data identified by the key to be put in the database
 * @public
 * @see DBMap#vensure
 * @see DBMap#ensure
 */
typedef DBData (*DBCreateData)(DBKey key, va_list args);

/**
 * Format of functions to be applied to an unspecified quantity of entries of
 * a database.
 * Any function that applies this function to the database will return the sum
 * of values returned by this function.
 * @param key Key of the database entry
 * @param data Data of the database entry
 * @param args Extra arguments of the function
 * @return Value to be added up by the function that is applying this
 * @public
 * @see DBMap#vforeach
 * @see DBMap#foreach
 * @see DBMap#vdestroy
 * @see DBMap#destroy
 */
typedef int (*DBApply)(DBKey key, DBData *data, va_list args);

/**
 * Format of functions that match database entries.
 * The purpose of the match depends on the function that is calling the matcher.
 * Returns 0 if it is a match, another number otherwise.
 * @param key Key of the database entry
 * @param data Data of the database entry
 * @param args Extra arguments of the function
 * @return 0 if a match, another number otherwise
 * @public
 * @see DBMap#getall
 */
typedef int (*DBMatcher)(DBKey key, DBData data, va_list args);

/**
 * Format of the comparators used internally by the database system.
 * Compares key1 to key2.
 * Returns 0 is equal, negative if lower and positive is higher.
 * @param key1 Key being compared
 * @param key2 Key we are comparing to
 * @param maxlen Maximum number of characters used in DB_STRING and DB_ISTRING
 *          databases.
 * @return 0 if equal, negative if lower and positive if higher
 * @public
 * @see #db_default_cmp(DBType)
 */
typedef int (*DBComparator)(DBKey key1, DBKey key2, unsigned short maxlen);

/**
 * Format of the hashers used internally by the database system.
 * Creates the hash of the key.
 * @param key Key being hashed
 * @param maxlen Maximum number of characters used in DB_STRING and DB_ISTRING
 *          databases.
 * @return Hash of the key
 * @public
 * @see #db_default_hash(DBType)
 */
typedef uint64 (*DBHasher)(DBKey key, unsigned short maxlen);

/**
 * Format of the releaser used by the database system.
 * Releases nothing, the key, the data or both.
 * All standard releasers use aFree to release.
 * @param key Key of the database entry
 * @param data Data of the database entry
 * @param which What is being requested to be released
 * @public
 * @see #DBRelease
 * @see #db_default_releaser(DBType,DBOptions)
 * @see #db_custom_release(DBRelease)
 */
typedef void (*DBReleaser)(DBKey key, DBData data, DBRelease which);



typedef struct DBIterator DBIterator;
typedef struct DBMap DBMap;



/**
 * Database iterator.
 * Supports forward iteration, backward iteration and removing entries from the database.
 * The iterator is initially positioned before the first entry of the database.
 * While the iterator exists the database is locked internally, so invoke
 * {@link DBIterator#destroy} as soon as possible.
 * @public
 * @see #DBMap
 */
struct DBIterator
{

	/**
	 * Fetches the first entry in the database.
	 * Returns the data of the entry.
	 * Puts the key in out_key, if out_key is not NULL.
	 * @param self Iterator
	 * @param out_key Key of the entry
	 * @return Data of the entry
	 * @protected
	 */
	DBData* (*first)(DBIterator* self, DBKey* out_key);

	/**
	 * Fetches the last entry in the database.
	 * Returns the data of the entry.
	 * Puts the key in out_key, if out_key is not NULL.
	 * @param self Iterator
	 * @param out_key Key of the entry
	 * @return Data of the entry
	 * @protected
	 */
	DBData* (*last)(DBIterator* self, DBKey* out_key);

	/**
	 * Fetches the next entry in the database.
	 * Returns the data of the entry.
	 * Puts the key in out_key, if out_key is not NULL.
	 * @param self Iterator
	 * @param out_key Key of the entry
	 * @return Data of the entry
	 * @protected
	 */
	DBData* (*next)(DBIterator* self, DBKey* out_key);

	/**
	 * Fetches the previous entry in the database.
	 * Returns the data of the entry.
	 * Puts the key in out_key, if out_key is not NULL.
	 * @param self Iterator
	 * @param out_key Key of the entry
	 * @return Data of the entry
	 * @protected
	 */
	DBData* (*prev)(DBIterator* self, DBKey* out_key);

	/**
	 * Returns true if the fetched entry exists.
	 * The databases entries might have NULL data, so use this to to test if
	 * the iterator is done.
	 * @param self Iterator
	 * @return true is the entry exists
	 * @protected
	 */
	bool (*exists)(DBIterator* self);

	/**
	 * Removes the current entry from the database.
	 * NOTE: {@link DBIterator#exists} will return false until another entry
	 *       is fetched
	 * Puts data of the removed entry in out_data, if out_data is not NULL.
	 * @param self Iterator
	 * @param out_data Data of the removed entry.
	 * @return 1 if entry was removed, 0 otherwise
	 * @protected
	 * @see DBMap#remove
	 */
	int (*remove)(DBIterator* self, DBData *out_data);

	/**
	 * Destroys this iterator and unlocks the database.
	 * @param self Iterator
	 * @protected
	 */
	void (*destroy)(DBIterator* self);

};

/**
 * Public interface of a database. Only contains funtions.
 * All the functions take the interface as the first argument.
 * @public
 * @see #db_alloc(const char*,int,DBType,DBOptions,unsigned short)
 */
struct DBMap {

	/**
	 * Returns a new iterator for this database.
	 * The iterator keeps the database locked until it is destroyed.
	 * The database will keep functioning normally but will only free internal
	 * memory when unlocked, so destroy the iterator as soon as possible.
	 * @param self Database
	 * @return New iterator
	 * @protected
	 */
	DBIterator* (*iterator)(DBMap* self);

	/**
	 * Returns true if the entry exists.
	 * @param self Database
	 * @param key Key that identifies the entry
	 * @return true is the entry exists
	 * @protected
	 */
	bool (*exists)(DBMap* self, DBKey key);

	/**
	 * Get the data of the entry identified by the key.
	 * @param self Database
	 * @param key Key that identifies the entry
	 * @return Data of the entry or NULL if not found
	 * @protected
	 */
	DBData* (*get)(DBMap* self, DBKey key);

	/**
	 * Just calls {@link DBMap#vgetall}.
	 * Get the data of the entries matched by <code>match</code>.
	 * It puts a maximum of <code>max</code> entries into <code>buf</code>.
	 * If <code>buf</code> is NULL, it only counts the matches.
	 * Returns the number of entries that matched.
	 * NOTE: if the value returned is greater than <code>max</code>, only the
	 * first <code>max</code> entries found are put into the buffer.
	 * @param self Database
	 * @param buf Buffer to put the data of the matched entries
	 * @param max Maximum number of data entries to be put into buf
	 * @param match Function that matches the database entries
	 * @param ... Extra arguments for match
	 * @return The number of entries that matched
	 * @protected
	 * @see DBMap#vgetall(DBMap*,void **,unsigned int,DBMatcher,va_list)
	 */
	unsigned int (*getall)(DBMap* self, DBData** buf, unsigned int max, DBMatcher match, ...);

	/**
	 * Get the data of the entries matched by <code>match</code>.
	 * It puts a maximum of <code>max</code> entries into <code>buf</code>.
	 * If <code>buf</code> is NULL, it only counts the matches.
	 * Returns the number of entries that matched.
	 * NOTE: if the value returned is greater than <code>max</code>, only the
	 * first <code>max</code> entries found are put into the buffer.
	 * @param self Database
	 * @param buf Buffer to put the data of the matched entries
	 * @param max Maximum number of data entries to be put into buf
	 * @param match Function that matches the database entries
	 * @param ... Extra arguments for match
	 * @return The number of entries that matched
	 * @protected
	 * @see DBMap#getall(DBMap*,void **,unsigned int,DBMatcher,...)
	 */
	unsigned int (*vgetall)(DBMap* self, DBData** buf, unsigned int max, DBMatcher match, va_list args);

	/**
	 * Just calls {@link DBMap#vensure}.
	 * Get the data of the entry identified by the key.
	 * If the entry does not exist, an entry is added with the data returned by
	 * <code>create</code>.
	 * @param self Database
	 * @param key Key that identifies the entry
	 * @param create Function used to create the data if the entry doesn't exist
	 * @param ... Extra arguments for create
	 * @return Data of the entry
	 * @protected
	 * @see DBMap#vensure(DBMap*,DBKey,DBCreateData,va_list)
	 */
	DBData* (*ensure)(DBMap* self, DBKey key, DBCreateData create, ...);

	/**
	 * Get the data of the entry identified by the key.
	 * If the entry does not exist, an entry is added with the data returned by
	 * <code>create</code>.
	 * @param self Database
	 * @param key Key that identifies the entry
	 * @param create Function used to create the data if the entry doesn't exist
	 * @param args Extra arguments for create
	 * @return Data of the entry
	 * @protected
	 * @see DBMap#ensure(DBMap*,DBKey,DBCreateData,...)
	 */
	DBData* (*vensure)(DBMap* self, DBKey key, DBCreateData create, va_list args);

	/**
	 * Put the data identified by the key in the database.
	 * Puts the previous data in out_data, if out_data is not NULL.
	 * NOTE: Uses the new key, the old one is released.
	 * @param self Database
	 * @param key Key that identifies the data
	 * @param data Data to be put in the database
	 * @param out_data Previous data if the entry exists
	 * @return 1 if if the entry already exists, 0 otherwise
	 * @protected
	 */
	int (*put)(DBMap* self, DBKey key, DBData data, DBData *out_data);

	/**
	 * Remove an entry from the database.
	 * Puts the previous data in out_data, if out_data is not NULL.
	 * NOTE: The key (of the database) is released.
	 * @param self Database
	 * @param key Key that identifies the entry
	 * @param out_data Previous data if the entry exists
	 * @return 1 if if the entry already exists, 0 otherwise
	 * @protected
	 */
	int (*remove)(DBMap* self, DBKey key, DBData *out_data);

	/**
	 * Just calls {@link DBMap#vforeach}.
	 * Apply <code>func</code> to every entry in the database.
	 * Returns the sum of values returned by func.
	 * @param self Database
	 * @param func Function to be applied
	 * @param ... Extra arguments for func
	 * @return Sum of the values returned by func
	 * @protected
	 * @see DBMap#vforeach(DBMap*,DBApply,va_list)
	 */
	int (*foreach)(DBMap* self, DBApply func, ...);

	/**
	 * Apply <code>func</code> to every entry in the database.
	 * Returns the sum of values returned by func.
	 * @param self Database
	 * @param func Function to be applied
	 * @param args Extra arguments for func
	 * @return Sum of the values returned by func
	 * @protected
	 * @see DBMap#foreach(DBMap*,DBApply,...)
	 */
	int (*vforeach)(DBMap* self, DBApply func, va_list args);

	/**
	 * Just calls {@link DBMap#vclear}.
	 * Removes all entries from the database.
	 * Before deleting an entry, func is applied to it.
	 * Releases the key and the data.
	 * Returns the sum of values returned by func, if it exists.
	 * @param self Database
	 * @param func Function to be applied to every entry before deleting
	 * @param ... Extra arguments for func
	 * @return Sum of values returned by func
	 * @protected
	 * @see DBMap#vclear(DBMap*,DBApply,va_list)
	 */
	int (*clear)(DBMap* self, DBApply func, ...);

	/**
	 * Removes all entries from the database.
	 * Before deleting an entry, func is applied to it.
	 * Releases the key and the data.
	 * Returns the sum of values returned by func, if it exists.
	 * @param self Database
	 * @param func Function to be applied to every entry before deleting
	 * @param args Extra arguments for func
	 * @return Sum of values returned by func
	 * @protected
	 * @see DBMap#clear(DBMap*,DBApply,...)
	 */
	int (*vclear)(DBMap* self, DBApply func, va_list args);

	/**
	 * Just calls {@link DBMap#vdestroy}.
	 * Finalize the database, feeing all the memory it uses.
	 * Before deleting an entry, func is applied to it.
	 * Releases the key and the data.
	 * Returns the sum of values returned by func, if it exists.
	 * NOTE: This locks the database globally. Any attempt to insert or remove
	 * a database entry will give an error and be aborted (except for clearing).
	 * @param self Database
	 * @param func Function to be applied to every entry before deleting
	 * @param ... Extra arguments for func
	 * @return Sum of values returned by func
	 * @protected
	 * @see DBMap#vdestroy(DBMap*,DBApply,va_list)
	 */
	int (*destroy)(DBMap* self, DBApply func, ...);

	/**
	 * Finalize the database, feeing all the memory it uses.
	 * Before deleting an entry, func is applied to it.
	 * Returns the sum of values returned by func, if it exists.
	 * NOTE: This locks the database globally. Any attempt to insert or remove
	 * a database entry will give an error and be aborted (except for clearing).
	 * @param self Database
	 * @param func Function to be applied to every entry before deleting
	 * @param args Extra arguments for func
	 * @return Sum of values returned by func
	 * @protected
	 * @see DBMap#destroy(DBMap*,DBApply,...)
	 */
	int (*vdestroy)(DBMap* self, DBApply func, va_list args);

	/**
	 * Return the size of the database (number of items in the database).
	 * @param self Database
	 * @return Size of the database
	 * @protected
	 */
	unsigned int (*size)(DBMap* self);

	/**
	 * Return the type of the database.
	 * @param self Database
	 * @return Type of the database
	 * @protected
	 */
	DBType (*type)(DBMap* self);

	/**
	 * Return the options of the database.
	 * @param self Database
	 * @return Options of the database
	 * @protected
	 */
	DBOptions (*options)(DBMap* self);

};

// For easy access to the common functions.

#define db_exists(db,k)     ( (db)->exists((db),(k)) )
#define idb_exists(db,k)    ( (db)->exists((db),DB->i2key(k)) )
#define uidb_exists(db,k)   ( (db)->exists((db),DB->ui2key(k)) )
#define strdb_exists(db,k)  ( (db)->exists((db),DB->str2key(k)) )
#define i64db_exists(db,k)  ( (db)->exists((db),DB->i642key(k)) )
#define ui64db_exists(db,k) ( (db)->exists((db),DB->ui642key(k)) )

// Get pointer-type data from DBMaps of various key types
#define db_get(db,k)     ( DB->data2ptr((db)->get((db),(k))) )
#define idb_get(db,k)    ( DB->data2ptr((db)->get((db),DB->i2key(k))) )
#define uidb_get(db,k)   ( DB->data2ptr((db)->get((db),DB->ui2key(k))) )
#define strdb_get(db,k)  ( DB->data2ptr((db)->get((db),DB->str2key(k))) )
#define i64db_get(db,k)  ( DB->data2ptr((db)->get((db),DB->i642key(k))) )
#define ui64db_get(db,k) ( DB->data2ptr((db)->get((db),DB->ui642key(k))) )


// Get int-type data from DBMaps of various key types
#define db_iget(db,k)     ( DB->data2i((db)->get((db),(k))) )
#define idb_iget(db,k)    ( DB->data2i((db)->get((db),DB->i2key(k))) )
#define uidb_iget(db,k)   ( DB->data2i((db)->get((db),DB->ui2key(k))) )
#define strdb_iget(db,k)  ( DB->data2i((db)->get((db),DB->str2key(k))) )
#define i64db_iget(db,k)  ( DB->data2i((db)->get((db),DB->i642key(k))) )
#define ui64db_iget(db,k) ( DB->data2i((db)->get((db),DB->ui642key(k))) )

// Get uint-type data from DBMaps of various key types
#define db_uiget(db,k)     ( DB->data2ui((db)->get((db),(k))) )
#define idb_uiget(db,k)    ( DB->data2ui((db)->get((db),DB->i2key(k))) )
#define uidb_uiget(db,k)   ( DB->data2ui((db)->get((db),DB->ui2key(k))) )
#define strdb_uiget(db,k)  ( DB->data2ui((db)->get((db),DB->str2key(k))) )
#define i64db_uiget(db,k)  ( DB->data2ui((db)->get((db),DB->i642key(k))) )
#define ui64db_uiget(db,k) ( DB->data2ui((db)->get((db),DB->ui642key(k))) )

// Put pointer-type data into DBMaps of various key types
#define db_put(db,k,d)     ( (db)->put((db),(k),DB->ptr2data(d),NULL) )
#define idb_put(db,k,d)    ( (db)->put((db),DB->i2key(k),DB->ptr2data(d),NULL) )
#define uidb_put(db,k,d)   ( (db)->put((db),DB->ui2key(k),DB->ptr2data(d),NULL) )
#define strdb_put(db,k,d)  ( (db)->put((db),DB->str2key(k),DB->ptr2data(d),NULL) )
#define i64db_put(db,k,d)  ( (db)->put((db),DB->i642key(k),DB->ptr2data(d),NULL) )
#define ui64db_put(db,k,d) ( (db)->put((db),DB->ui642key(k),DB->ptr2data(d),NULL) )

// Put int-type data into DBMaps of various key types
#define db_iput(db,k,d)     ( (db)->put((db),(k),DB->i2data(d),NULL) )
#define idb_iput(db,k,d)    ( (db)->put((db),DB->i2key(k),DB->i2data(d),NULL) )
#define uidb_iput(db,k,d)   ( (db)->put((db),DB->ui2key(k),DB->i2data(d),NULL) )
#define strdb_iput(db,k,d)  ( (db)->put((db),DB->str2key(k),DB->i2data(d),NULL) )
#define i64db_iput(db,k,d)  ( (db)->put((db),DB->i642key(k),DB->i2data(d),NULL) )
#define ui64db_iput(db,k,d) ( (db)->put((db),DB->ui642key(k),DB->i2data(d),NULL) )

// Put uint-type data into DBMaps of various key types
#define db_uiput(db,k,d)     ( (db)->put((db),(k),DB->ui2data(d),NULL) )
#define idb_uiput(db,k,d)    ( (db)->put((db),DB->i2key(k),DB->ui2data(d),NULL) )
#define uidb_uiput(db,k,d)   ( (db)->put((db),DB->ui2key(k),DB->ui2data(d),NULL) )
#define strdb_uiput(db,k,d)  ( (db)->put((db),DB->str2key(k),DB->ui2data(d),NULL) )
#define i64db_uiput(db,k,d)  ( (db)->put((db),DB->i642key(k),DB->ui2data(d),NULL) )
#define ui64db_uiput(db,k,d) ( (db)->put((db),DB->ui642key(k),DB->ui2data(d),NULL) )

// Remove entry from DBMaps of various key types
#define db_remove(db,k)     ( (db)->remove((db),(k),NULL) )
#define idb_remove(db,k)    ( (db)->remove((db),DB->i2key(k),NULL) )
#define uidb_remove(db,k)   ( (db)->remove((db),DB->ui2key(k),NULL) )
#define strdb_remove(db,k)  ( (db)->remove((db),DB->str2key(k),NULL) )
#define i64db_remove(db,k)  ( (db)->remove((db),DB->i642key(k),NULL) )
#define ui64db_remove(db,k) ( (db)->remove((db),DB->ui642key(k),NULL) )

//These are discarding the possible vargs you could send to the function, so those
//that require vargs must not use these defines.
#define db_ensure(db,k,f)     ( DB->data2ptr((db)->ensure((db),(k),(f))) )
#define idb_ensure(db,k,f)    ( DB->data2ptr((db)->ensure((db),DB->i2key(k),(f))) )
#define uidb_ensure(db,k,f)   ( DB->data2ptr((db)->ensure((db),DB->ui2key(k),(f))) )
#define strdb_ensure(db,k,f)  ( DB->data2ptr((db)->ensure((db),DB->str2key(k),(f))) )
#define i64db_ensure(db,k,f)  ( DB->data2ptr((db)->ensure((db),DB->i642key(k),(f))) )
#define ui64db_ensure(db,k,f) ( DB->data2ptr((db)->ensure((db),DB->ui642key(k),(f))) )

// Database creation and destruction macros
#define idb_alloc(opt)            DB->alloc(__FILE__,__func__,__LINE__,DB_INT,(opt),sizeof(int))
#define uidb_alloc(opt)           DB->alloc(__FILE__,__func__,__LINE__,DB_UINT,(opt),sizeof(unsigned int))
#define strdb_alloc(opt,maxlen)   DB->alloc(__FILE__,__func__,__LINE__,DB_STRING,(opt),(maxlen))
#define stridb_alloc(opt,maxlen)  DB->alloc(__FILE__,__func__,__LINE__,DB_ISTRING,(opt),(maxlen))
#define i64db_alloc(opt)          DB->alloc(__FILE__,__func__,__LINE__,DB_INT64,(opt),sizeof(int64))
#define ui64db_alloc(opt)         DB->alloc(__FILE__,__func__,__LINE__,DB_UINT64,(opt),sizeof(uint64))
#define db_destroy(db)            ( (db)->destroy((db),NULL) )
// Other macros
#define db_clear(db)        ( (db)->clear((db),NULL) )
#define db_size(db)         ( (db)->size(db) )
#define db_iterator(db)     ( (db)->iterator(db) )
#define dbi_first(dbi)      ( DB->data2ptr((dbi)->first((dbi),NULL)) )
#define dbi_last(dbi)       ( DB->data2ptr((dbi)->last((dbi),NULL)) )
#define dbi_next(dbi)       ( DB->data2ptr((dbi)->next((dbi),NULL)) )
#define dbi_prev(dbi)       ( DB->data2ptr((dbi)->prev((dbi),NULL)) )
#define dbi_remove(dbi)     ( (dbi)->remove((dbi),NULL) )
#define dbi_exists(dbi)     ( (dbi)->exists(dbi) )
#define dbi_destroy(dbi)    ( (dbi)->destroy(dbi) )

/*****************************************************************************\
 *  (2) Section with public functions.                                       *
 *  db_fix_options     - Fix the options for a type of database.             *
 *  db_default_cmp     - Get the default comparator for a type of database.  *
 *  db_default_hash    - Get the default hasher for a type of database.      *
 *  db_default_release - Get the default releaser for a type of database     *
 *           with the fixed options.                                         *
 *  db_custom_release  - Get the releaser that behaves as specified.         *
 *  db_alloc           - Allocate a new database.                            *
 *  db_i2key           - Manual cast from 'int' to 'DBKey'.                  *
 *  db_ui2key          - Manual cast from 'unsigned int' to 'DBKey'.         *
 *  db_str2key         - Manual cast from 'unsigned char *' to 'DBKey'.      *
 *  db_i642key         - Manual cast from 'int64' to 'DBKey'.                *
 *  db_ui642key        - Manual cast from 'uint64' to 'DBKey'.               *
 *  db_i2data          - Manual cast from 'int' to 'DBData'.                 *
 *  db_ui2data         - Manual cast from 'unsigned int' to 'DBData'.        *
 *  db_ptr2data        - Manual cast from 'void*' to 'DBData'.               *
 *  db_data2i          - Gets 'int' value from 'DBData'.                     *
 *  db_data2ui         - Gets 'unsigned int' value from 'DBData'.            *
 *  db_data2ptr        - Gets 'void*' value from 'DBData'.                   *
 *  db_init            - Initializes the database system.                    *
 *  db_final           - Finalizes the database system.                      *
\*****************************************************************************/

struct db_interface {
/**
 * Returns the fixed options according to the database type.
 * Sets required options and unsets unsupported options.
 * For numeric databases DB_OPT_DUP_KEY and DB_OPT_RELEASE_KEY are unset.
 * @param type Type of the database
 * @param options Original options of the database
 * @return Fixed options of the database
 * @private
 * @see #DBType
 * @see #DBOptions
 * @see #db_default_release(DBType,DBOptions)
 */
DBOptions (*fix_options) (DBType type, DBOptions options);

/**
 * Returns the default comparator for the type of database.
 * @param type Type of database
 * @return Comparator for the type of database or NULL if unknown database
 * @public
 * @see #DBType
 * @see #DBComparator
 */
DBComparator (*default_cmp) (DBType type);

/**
 * Returns the default hasher for the specified type of database.
 * @param type Type of database
 * @return Hasher of the type of database or NULL if unknown database
 * @public
 * @see #DBType
 * @see #DBHasher
 */
DBHasher (*default_hash) (DBType type);

/**
 * Returns the default releaser for the specified type of database with the
 * specified options.
 * NOTE: the options are fixed by {@link #db_fix_options(DBType,DBOptions)}
 * before choosing the releaser
 * @param type Type of database
 * @param options Options of the database
 * @return Default releaser for the type of database with the fixed options
 * @public
 * @see #DBType
 * @see #DBOptions
 * @see #DBReleaser
 * @see #db_fix_options(DBType,DBOptions)
 * @see #db_custom_release(DBRelease)
 */
DBReleaser (*default_release) (DBType type, DBOptions options);

/**
 * Returns the releaser that behaves as <code>which</code> specifies.
 * @param which Defines what the releaser releases
 * @return Releaser for the specified release options
 * @public
 * @see #DBRelease
 * @see #DBReleaser
 * @see #db_default_release(DBType,DBOptions)
 */
DBReleaser (*custom_release)  (DBRelease which);

/**
 * Allocate a new database of the specified type.
 * It uses the default comparator, hasher and releaser of the specified
 * database type and fixed options.
 * NOTE: the options are fixed by {@link #db_fix_options(DBType,DBOptions)}
 * before creating the database.
 * @param file File where the database is being allocated
 * @param line Line of the file where the database is being allocated
 * @param type Type of database
 * @param options Options of the database
 * @param maxlen Maximum length of the string to be used as key in string
 *          databases. If 0, the maximum number of maxlen is used (64K).
 * @return The interface of the database
 * @public
 * @see #DBType
 * @see #DBMap
 * @see #db_default_cmp(DBType)
 * @see #db_default_hash(DBType)
 * @see #db_default_release(DBType,DBOptions)
 * @see #db_fix_options(DBType,DBOptions)
 */
DBMap* (*alloc) (const char *file, const char *func, int line, DBType type, DBOptions options, unsigned short maxlen);

/**
 * Manual cast from 'int' to the union DBKey.
 * @param key Key to be casted
 * @return The key as a DBKey union
 * @public
 */
DBKey (*i2key) (int key);

/**
 * Manual cast from 'unsigned int' to the union DBKey.
 * @param key Key to be casted
 * @return The key as a DBKey union
 * @public
 */
DBKey (*ui2key) (unsigned int key);

/**
 * Manual cast from 'unsigned char *' to the union DBKey.
 * @param key Key to be casted
 * @return The key as a DBKey union
 * @public
 */
DBKey (*str2key) (const char *key);

/**
 * Manual cast from 'int64' to the union DBKey.
 * @param key Key to be casted
 * @return The key as a DBKey union
 * @public
 */
DBKey (*i642key) (int64 key);

/**
 * Manual cast from 'uint64' to the union DBKey.
 * @param key Key to be casted
 * @return The key as a DBKey union
 * @public
 */
DBKey (*ui642key) (uint64 key);
	
/**
 * Manual cast from 'int' to the struct DBData.
 * @param data Data to be casted
 * @return The data as a DBData struct
 * @public
 */
DBData (*i2data) (int data);

/**
 * Manual cast from 'unsigned int' to the struct DBData.
 * @param data Data to be casted
 * @return The data as a DBData struct
 * @public
 */
DBData (*ui2data) (unsigned int data);

/**
 * Manual cast from 'void *' to the struct DBData.
 * @param data Data to be casted
 * @return The data as a DBData struct
 * @public
 */
DBData (*ptr2data) (void *data);

/**
 * Gets int type data from struct DBData.
 * If data is not int type, returns 0.
 * @param data Data
 * @return Integer value of the data.
 * @public
 */
int (*data2i) (DBData *data);

/**
 * Gets unsigned int type data from struct DBData.
 * If data is not unsigned int type, returns 0.
 * @param data Data
 * @return Unsigned int value of the data.
 * @public
 */
unsigned int (*data2ui) (DBData *data);

/**
 * Gets void* type data from struct DBData.
 * If data is not void* type, returns NULL.
 * @param data Data
 * @return Void* value of the data.
 * @public
 */
void* (*data2ptr) (DBData *data);

/**
 * Initialize the database system.
 * @public
 * @see #db_final(void)
 */
void (*init) (void);

/**
 * Finalize the database system.
 * Frees the memory used by the block reusage system.
 * @public
 * @see #db_init(void)
 */
void (*final) (void);
} DB_s;

struct db_interface *DB;

void db_defaults(void);
// Link DB System - From jAthena
struct linkdb_node {
	struct linkdb_node *next;
	struct linkdb_node *prev;
	void               *key;
	void               *data;
};

typedef void (*LinkDBFunc)(void* key, void* data, va_list args);

void  linkdb_insert  (struct linkdb_node** head, void *key, void* data); // Doesn't take into account duplicate keys
void  linkdb_replace (struct linkdb_node** head, void *key, void* data); // Takes into account duplicate keys
void* linkdb_search  (struct linkdb_node** head, void *key);
void* linkdb_erase   (struct linkdb_node** head, void *key);
void  linkdb_final   (struct linkdb_node** head);
void  linkdb_vforeach(struct linkdb_node** head, LinkDBFunc func, va_list ap);
void  linkdb_foreach (struct linkdb_node** head, LinkDBFunc func, ...);



/// Finds an entry in an array.
/// ex: ARR_FIND(0, size, i, list[i] == target);
///
/// @param __start   Starting index (ex: 0)
/// @param __end     End index (ex: size of the array)
/// @param __var     Index variable
/// @param __cmp     Expression that returns true when the target entry is found
#define ARR_FIND(__start, __end, __var, __cmp) \
	do{ \
		for( (__var) = (__start); (__var) < (__end); ++(__var) ) \
			if( __cmp ) \
				break; \
	}while(0)



/// Moves an entry of the array.
/// Use ARR_MOVERIGHT/ARR_MOVELEFT if __from and __to are direct numbers.
/// ex: ARR_MOVE(i, 0, list, int);// move index i to index 0
///
///
/// @param __from   Initial index of the entry
/// @param __to     Target index of the entry
/// @param __arr    Array
/// @param __type   Type of entry
#define ARR_MOVE(__from, __to, __arr, __type) \
	do{ \
		if( (__from) != (__to) ) \
		{ \
			__type __backup__; \
			memmove(&__backup__, (__arr)+(__from), sizeof(__type)); \
			if( (__from) < (__to) ) \
				memmove((__arr)+(__from), (__arr)+(__from)+1, ((__to)-(__from))*sizeof(__type)); \
			else if( (__from) > (__to) ) \
				memmove((__arr)+(__to)+1, (__arr)+(__to), ((__from)-(__to))*sizeof(__type)); \
			memmove((__arr)+(__to), &__backup__, sizeof(__type)); \
		} \
	}while(0)



/// Moves an entry of the array to the right.
/// ex: ARR_MOVERIGHT(1, 4, list, int);// move index 1 to index 4
///
/// @param __from   Initial index of the entry
/// @param __to     Target index of the entry
/// @param __arr    Array
/// @param __type   Type of entry
#define ARR_MOVERIGHT(__from, __to, __arr, __type) \
	do{ \
		__type __backup__; \
		memmove(&__backup__, (__arr)+(__from), sizeof(__type)); \
		memmove((__arr)+(__from), (__arr)+(__from)+1, ((__to)-(__from))*sizeof(__type)); \
		memmove((__arr)+(__to), &__backup__, sizeof(__type)); \
	}while(0)



/// Moves an entry of the array to the left.
/// ex: ARR_MOVELEFT(3, 0, list, int);// move index 3 to index 0
///
/// @param __from   Initial index of the entry
/// @param __end    Target index of the entry
/// @param __arr    Array
/// @param __type   Type of entry
#define ARR_MOVELEFT(__from, __to, __arr, __type) \
	do{ \
		__type __backup__; \
		memmove(&__backup__, (__arr)+(__from), sizeof(__type)); \
		memmove((__arr)+(__to)+1, (__arr)+(__to), ((__from)-(__to))*sizeof(__type)); \
		memmove((__arr)+(__to), &__backup__, sizeof(__type)); \
	}while(0)



/////////////////////////////////////////////////////////////////////
// Vector library based on defines. (dynamic array)
// uses aMalloc, aRealloc, aFree



/// Declares an anonymous vector struct.
///
/// @param __type Type of data
#define VECTOR_DECL(__type) \
	struct { \
		size_t _max_; \
		size_t _len_; \
		__type* _data_; \
	}



/// Declares a named vector struct.
///
/// @param __name Structure name
/// @param __type Type of data
#define VECTOR_STRUCT_DECL(__name,__type) \
	struct __name { \
		size_t _max_; \
		size_t _len_; \
		__type* _data_; \
	}



/// Declares and initializes an anonymous vector variable.
///
/// @param __type Type of data
/// @param __var Variable name
#define VECTOR_VAR(__type,__var) \
	VECTOR_DECL(__type) __var = {0,0,NULL}



/// Declares and initializes a named vector variable.
///
/// @param __name Structure name
/// @param __var Variable name
#define VECTOR_STRUCT_VAR(__name,__var) \
	struct __name __var = {0,0,NULL}



/// Initializes a vector.
///
/// @param __vec Vector
#define VECTOR_INIT(__vec) \
	memset(&(__vec), 0, sizeof(__vec))



/// Returns the internal array of values.
///
/// @param __vec Vector
/// @return Array of values
#define VECTOR_DATA(__vec) \
	( (__vec)._data_ )



/// Returns the length of the vector.
///
/// @param __vec Vector
/// @return Length
#define VECTOR_LENGTH(__vec) \
	( (__vec)._len_ )



/// Returns the capacity of the vector.
///
/// @param __vec Vector
/// @return Capacity
#define VECTOR_CAPACITY(__vec) \
	( (__vec)._max_ )



/// Returns the value at the target index.
/// Assumes the index exists.
///
/// @param __vec Vector
/// @param __idx Index
/// @return Value
#define VECTOR_INDEX(__vec,__idx) \
	( VECTOR_DATA(__vec)[__idx] )



/// Returns the first value of the vector.
/// Assumes the array is not empty.
///
/// @param __vec Vector
/// @return First value
#define VECTOR_FIRST(__vec) \
	( VECTOR_INDEX(__vec,0) )



/// Returns the last value of the vector.
/// Assumes the array is not empty.
///
/// @param __vec Vector
/// @return Last value
#define VECTOR_LAST(__vec) \
	( VECTOR_INDEX(__vec,VECTOR_LENGTH(__vec)-1) )



/// Resizes the vector.
/// Excess values are discarded, new positions are zeroed.
///
/// @param __vec Vector
/// @param __n Size
#define VECTOR_RESIZE(__vec,__n) \
	do{ \
		if( (__n) > VECTOR_CAPACITY(__vec) ) \
		{ /* increase size */ \
			if( VECTOR_CAPACITY(__vec) == 0 ) SET_POINTER(VECTOR_DATA(__vec), aMalloc((__n)*sizeof(VECTOR_FIRST(__vec)))); /* allocate new */ \
			else SET_POINTER(VECTOR_DATA(__vec), aRealloc(VECTOR_DATA(__vec),(__n)*sizeof(VECTOR_FIRST(__vec)))); /* reallocate */ \
			memset(VECTOR_DATA(__vec)+VECTOR_LENGTH(__vec), 0, (VECTOR_CAPACITY(__vec)-VECTOR_LENGTH(__vec))*sizeof(VECTOR_FIRST(__vec))); /* clear new data */ \
			VECTOR_CAPACITY(__vec) = (__n); /* update capacity */ \
		} \
		else if( (__n) == 0 && VECTOR_CAPACITY(__vec) ) \
		{ /* clear vector */ \
			aFree(VECTOR_DATA(__vec)); VECTOR_DATA(__vec) = NULL; /* free data */ \
			VECTOR_CAPACITY(__vec) = 0; /* clear capacity */ \
			VECTOR_LENGTH(__vec) = 0; /* clear length */ \
		} \
		else if( (__n) < VECTOR_CAPACITY(__vec) ) \
		{ /* reduce size */ \
			SET_POINTER(VECTOR_DATA(__vec), aRealloc(VECTOR_DATA(__vec),(__n)*sizeof(VECTOR_FIRST(__vec)))); /* reallocate */ \
			VECTOR_CAPACITY(__vec) = (__n); /* update capacity */ \
			if( VECTOR_LENGTH(__vec) > (__n) ) VECTOR_LENGTH(__vec) = (__n); /* update length */ \
		} \
	}while(0)



/// Ensures that the array has the target number of empty positions.
/// Increases the capacity in multiples of __step.
///
/// @param __vec Vector
/// @param __n Empty positions
/// @param __step Increase
#define VECTOR_ENSURE(__vec,__n,__step) \
	do{ \
		size_t _empty_ = VECTOR_CAPACITY(__vec)-VECTOR_LENGTH(__vec); \
		if( (__n) > _empty_ ) { \
			while( (__n) > _empty_ ) _empty_ += (__step); \
			VECTOR_RESIZE(__vec,_empty_+VECTOR_LENGTH(__vec)); \
		} \
	}while(0)



/// Inserts a zeroed value in the target index.
/// Assumes the index is valid and there is enough capacity.
///
/// @param __vec Vector
/// @param __idx Index
#define VECTOR_INSERTZEROED(__vec,__idx) \
	do{ \
		if( (__idx) < VECTOR_LENGTH(__vec) ) /* move data */ \
			memmove(&VECTOR_INDEX(__vec,(__idx)+1),&VECTOR_INDEX(__vec,__idx),(VECTOR_LENGTH(__vec)-(__idx))*sizeof(VECTOR_FIRST(__vec))); \
		memset(&VECTOR_INDEX(__vec,__idx), 0, sizeof(VECTOR_INDEX(__vec,__idx))); /* set zeroed value */ \
		++VECTOR_LENGTH(__vec); /* increase length */ \
	}while(0)



/// Inserts a value in the target index. (using the '=' operator)
/// Assumes the index is valid and there is enough capacity.
///
/// @param __vec Vector
/// @param __idx Index
/// @param __val Value
#define VECTOR_INSERT(__vec,__idx,__val) \
	do{ \
		if( (__idx) < VECTOR_LENGTH(__vec) ) /* move data */ \
			memmove(&VECTOR_INDEX(__vec,(__idx)+1),&VECTOR_INDEX(__vec,__idx),(VECTOR_LENGTH(__vec)-(__idx))*sizeof(VECTOR_FIRST(__vec))); \
		VECTOR_INDEX(__vec,__idx) = (__val); /* set value */ \
		++VECTOR_LENGTH(__vec); /* increase length */ \
	}while(0)



/// Inserts a value in the target index. (using memcpy)
/// Assumes the index is valid and there is enough capacity.
///
/// @param __vec Vector
/// @param __idx Index
/// @param __val Value
#define VECTOR_INSERTCOPY(__vec,__idx,__val) \
	VECTOR_INSERTARRAY(__vec,__idx,&(__val),1)



/// Inserts the values of the array in the target index. (using memcpy)
/// Assumes the index is valid and there is enough capacity.
///
/// @param __vec Vector
/// @param __idx Index
/// @param __pval Array of values
/// @param __n Number of values
#define VECTOR_INSERTARRAY(__vec,__idx,__pval,__n) \
	do{ \
		if( (__idx) < VECTOR_LENGTH(__vec) ) /* move data */ \
			memmove(&VECTOR_INDEX(__vec,(__idx)+(__n)),&VECTOR_INDEX(__vec,__idx),(VECTOR_LENGTH(__vec)-(__idx))*sizeof(VECTOR_FIRST(__vec))); \
		memcpy(&VECTOR_INDEX(__vec,__idx), (__pval), (__n)*sizeof(VECTOR_FIRST(__vec))); /* set values */ \
		VECTOR_LENGTH(__vec) += (__n); /* increase length */ \
	}while(0)



/// Inserts a zeroed value in the end of the vector.
/// Assumes there is enough capacity.
///
/// @param __vec Vector
#define VECTOR_PUSHZEROED(__vec) \
	do{ \
		memset(&VECTOR_INDEX(__vec,VECTOR_LENGTH(__vec)), 0, sizeof(VECTOR_INDEX(__vec,VECTOR_LENGTH(__vec)))); /* set zeroed value */ \
		++VECTOR_LENGTH(__vec); /* increase length */ \
	}while(0)


/// Inserts a value in the end of the vector. (using the '=' operator)
/// Assumes there is enough capacity.
///
/// @param __vec Vector
/// @param __val Value
#define VECTOR_PUSH(__vec,__val) \
	do{ \
		VECTOR_INDEX(__vec,VECTOR_LENGTH(__vec)) = (__val); /* set value */ \
		++VECTOR_LENGTH(__vec); /* increase length */ \
	}while(0)



/// Inserts a value in the end of the vector. (using memcpy)
/// Assumes there is enough capacity.
///
/// @param __vec Vector
/// @param __val Value
#define VECTOR_PUSHCOPY(__vec,__val) \
	VECTOR_PUSHARRAY(__vec,&(__val),1)



/// Inserts the values of the array in the end of the vector. (using memcpy)
/// Assumes there is enough capacity.
///
/// @param __vec Vector
/// @param __pval Array of values
/// @param __n Number of values
#define VECTOR_PUSHARRAY(__vec,__pval,__n) \
	do{ \
		memcpy(&VECTOR_INDEX(__vec,VECTOR_LENGTH(__vec)), (__pval), (__n)*sizeof(VECTOR_FIRST(__vec))); /* set values */ \
		VECTOR_LENGTH(__vec) += (__n); /* increase length */ \
	}while(0)



/// Removes and returns the last value of the vector.
/// Assumes the array is not empty.
///
/// @param __vec Vector
/// @return Removed value
#define VECTOR_POP(__vec) \
	( VECTOR_INDEX(__vec,--VECTOR_LENGTH(__vec)) )



/// Removes the last N values of the vector and returns the value of the last pop.
/// Assumes there are enough values.
///
/// @param __vec Vector
/// @param __n Number of pops
/// @return Last removed value
#define VECTOR_POPN(__vec,__n) \
	( VECTOR_INDEX(__vec,(VECTOR_LENGTH(__vec)-=(__n))) )



/// Removes the target index from the vector.
/// Assumes the index is valid and there are enough values.
///
/// @param __vec Vector
/// @param __idx Index
#define VECTOR_ERASE(__vec,__idx) \
	VECTOR_ERASEN(__vec,__idx,1)



/// Removes N values from the target index of the vector.
/// Assumes the index is valid and there are enough values.
///
/// @param __vec Vector
/// @param __idx Index
/// @param __n Number of values
#define VECTOR_ERASEN(__vec,__idx,__n) \
	do{ \
		if( (__idx) < VECTOR_LENGTH(__vec)-(__n) ) /* move data */ \
			memmove(&VECTOR_INDEX(__vec,__idx),&VECTOR_INDEX(__vec,(__idx)+(__n)),(VECTOR_LENGTH(__vec)-((__idx)+(__n)))*sizeof(VECTOR_FIRST(__vec))); \
		VECTOR_LENGTH(__vec) -= (__n); /* decrease length */ \
	}while(0)



/// Clears the vector, freeing allocated data.
///
/// @param __vec Vector
#define VECTOR_CLEAR(__vec) \
	do{ \
		if( VECTOR_CAPACITY(__vec) ) \
		{ \
			aFree(VECTOR_DATA(__vec)); VECTOR_DATA(__vec) = NULL; /* clear allocated array */ \
			VECTOR_CAPACITY(__vec) = 0; /* clear capacity */ \
			VECTOR_LENGTH(__vec) = 0; /* clear length */ \
		} \
	}while(0)



/////////////////////////////////////////////////////////////////////
// Binary heap library based on defines. (uses the vector defines above)
// uses aMalloc, aRealloc, aFree



/// Declares an anonymous binary heap struct.
///
/// @param __type Type of data
#define BHEAP_DECL(__type) VECTOR_DECL(__type)



/// Declares a named binary heap struct.
///
/// @param __name Structure name
/// @param __type Type of data
#define BHEAP_STRUCT_DECL(__name,__type) VECTOR_STRUCT_DECL(__name,__type)



/// Declares and initializes an anonymous binary heap variable.
///
/// @param __type Type of data
/// @param __var Variable name
#define BHEAP_VAR(__type,__var) VECTOR_VAR(__type,__var)



/// Declares and initializes a named binary heap variable.
///
/// @param __name Structure name
/// @param __var Variable name
#define BHEAP_STRUCT_VAR(__name,__var) VECTOR_STRUCT_VAR(__name,__var)



/// Initializes a heap.
///
/// @param __heap Binary heap
#define BHEAP_INIT(__heap) VECTOR_INIT(__heap)



/// Returns the internal array of values.
///
/// @param __heap Binary heap
/// @return Array of values
#define BHEAP_DATA(__heap) VECTOR_DATA(__heap)



/// Returns the length of the heap.
///
/// @param __heap Binary heap
/// @return Length
#define BHEAP_LENGTH(__heap) VECTOR_LENGTH(__heap)



/// Returns the capacity of the heap.
///
/// @param __heap Binary heap
/// @return Capacity
#define BHEAP_CAPACITY(__heap) VECTOR_CAPACITY(__heap)



/// Ensures that the heap has the target number of empty positions.
/// Increases the capacity in multiples of __step.
///
/// @param __heap Binary heap
/// @param __n Empty positions
/// @param __step Increase
#define BHEAP_ENSURE(__heap,__n,__step) VECTOR_ENSURE(__heap,__n,__step)



/// Returns the top value of the heap.
/// Assumes the heap is not empty.
///
/// @param __heap Binary heap
/// @return Value at the top
#define BHEAP_PEEK(__heap) VECTOR_INDEX(__heap,0)



/// Inserts a value in the heap. (using the '=' operator)
/// Assumes there is enough capacity.
///
/// The comparator takes two values as arguments, returns:
/// - negative if the first value is on the top
/// - positive if the second value is on the top
/// - 0 if they are equal
///
/// @param __heap Binary heap
/// @param __val Value
/// @param __topcmp Comparator
/// @param __swp Swapper
#define BHEAP_PUSH(__heap,__val,__topcmp,__swp) \
	do{ \
		size_t _i_ = VECTOR_LENGTH(__heap); \
		VECTOR_PUSH(__heap,__val); /* insert at end */ \
		while( _i_ ) \
		{ /* restore heap property in parents */ \
			size_t _parent_ = (_i_-1)/2; \
			if( __topcmp(VECTOR_INDEX(__heap,_parent_),VECTOR_INDEX(__heap,_i_)) < 0 ) \
				break; /* done */ \
			__swp(VECTOR_INDEX(__heap,_parent_),VECTOR_INDEX(__heap,_i_)); \
			_i_ = _parent_; \
		} \
	}while(0)



/// Removes the top value of the heap. (using the '=' operator)
/// Assumes the heap is not empty.
///
/// The comparator takes two values as arguments, returns:
/// - negative if the first value is on the top
/// - positive if the second value is on the top
/// - 0 if they are equal
///
/// @param __heap Binary heap
/// @param __topcmp Comparator
/// @param __swp Swapper
#define BHEAP_POP(__heap,__topcmp,__swp) BHEAP_POPINDEX(__heap,0,__topcmp,__swp)



/// Removes the target value of the heap. (using the '=' operator)
/// Assumes the index exists.
///
/// The comparator takes two values as arguments, returns:
/// - negative if the first value is on the top
/// - positive if the second value is on the top
/// - 0 if they are equal
///
/// @param __heap Binary heap
/// @param __idx Index
/// @param __topcmp Comparator
/// @param __swp Swapper
#define BHEAP_POPINDEX(__heap,__idx,__topcmp,__swp) \
	do{ \
		size_t _i_ = __idx; \
		VECTOR_INDEX(__heap,__idx) = VECTOR_POP(__heap); /* put last at index */ \
		if( _i_ >= VECTOR_LENGTH(__heap)) /* removed last, nothing to do */ \
			break; \
		while( _i_ ) \
		{ /* restore heap property in parents */ \
			size_t _parent_ = (_i_-1)/2; \
			if( __topcmp(VECTOR_INDEX(__heap,_parent_),VECTOR_INDEX(__heap,_i_)) < 0 ) \
				break; /* done */ \
			__swp(VECTOR_INDEX(__heap,_parent_),VECTOR_INDEX(__heap,_i_)); \
			_i_ = _parent_; \
		} \
		while( _i_ < VECTOR_LENGTH(__heap) ) \
		{ /* restore heap property in childs */ \
			size_t _lchild_ = _i_*2 + 1; \
			size_t _rchild_ = _i_*2 + 2; \
			if( (_lchild_ >= VECTOR_LENGTH(__heap) || __topcmp(VECTOR_INDEX(__heap,_i_),VECTOR_INDEX(__heap,_lchild_)) <= 0) && \
				(_rchild_ >= VECTOR_LENGTH(__heap) || __topcmp(VECTOR_INDEX(__heap,_i_),VECTOR_INDEX(__heap,_rchild_)) <= 0) ) \
				break; /* done */ \
			else if( _rchild_ >= VECTOR_LENGTH(__heap) || __topcmp(VECTOR_INDEX(__heap,_lchild_),VECTOR_INDEX(__heap,_rchild_)) <= 0 ) \
			{ /* left child */ \
				__swp(VECTOR_INDEX(__heap,_i_),VECTOR_INDEX(__heap,_lchild_)); \
				_i_ = _lchild_; \
			} \
			else \
			{ /* right child */ \
				__swp(VECTOR_INDEX(__heap,_i_),VECTOR_INDEX(__heap,_rchild_)); \
				_i_ = _rchild_; \
			} \
		} \
	}while(0)



/// Clears the binary heap, freeing allocated data.
///
/// @param __heap Binary heap
#define BHEAP_CLEAR(__heap) VECTOR_CLEAR(__heap)



/// Generic comparator for a min-heap. (minimum value at top)
/// Returns -1 if v1 is smaller, 1 if v2 is smaller, 0 if equal.
///
/// @param v1 First value
/// @param v2 Second value
/// @return negative if v1 is top, positive if v2 is top, 0 if equal
#define BHEAP_MINTOPCMP(v1,v2) ( v1 == v2 ? 0 : v1 < v2 ? -1 : 1 )



/// Generic comparator for a max-heap. (maximum value at top)
/// Returns -1 if v1 is bigger, 1 if v2 is bigger, 0 if equal.
///
/// @param v1 First value
/// @param v2 Second value
/// @return negative if v1 is top, positive if v2 is top, 0 if equal
#define BHEAP_MAXTOPCMP(v1,v2) ( v1 == v2 ? 0 : v1 > v2 ? -1 : 1 )



#endif /* _COMMON_DB_H_ */