summaryrefslogtreecommitdiffstats
path: root/win/tclWinReg.c
blob: 10437e64b0d51f1643a7e2404eb7921fb7c5ac79 (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
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
/*
 * tclWinReg.c --
 *
 *	This file contains the implementation of the "registry" Tcl built-in
 *	command. This command is built as a dynamically loadable extension in
 *	a separate DLL.
 *
 * Copyright (c) 1997 by Sun Microsystems, Inc.
 * Copyright (c) 1998-1999 by Scriptics Corporation.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#undef STATIC_BUILD
#ifndef USE_TCL_STUBS
#   define USE_TCL_STUBS
#endif
#include "tclInt.h"
#ifdef _MSC_VER
#   pragma comment (lib, "advapi32.lib")
#endif
#include <stdlib.h>

#ifndef UNICODE
#   undef Tcl_WinTCharToUtf
#   define Tcl_WinTCharToUtf(a,b,c) Tcl_ExternalToUtfDString(NULL,a,b,c)
#   undef Tcl_WinUtfToTChar
#   define Tcl_WinUtfToTChar(a,b,c) Tcl_UtfToExternalDString(NULL,a,b,c)
#endif

/*
 * Ensure that we can say which registry is being accessed.
 */

#ifndef KEY_WOW64_64KEY
#define KEY_WOW64_64KEY		(0x0100)
#endif
#ifndef KEY_WOW64_32KEY
#define KEY_WOW64_32KEY		(0x0200)
#endif

/*
 * The maximum length of a sub-key name.
 */

#ifndef MAX_KEY_LENGTH
#define MAX_KEY_LENGTH		256
#endif

/*
 * TCL_STORAGE_CLASS is set unconditionally to DLLEXPORT because the
 * Registry_Init declaration is in the source file itself, which is only
 * accessed when we are building a library.
 */

#undef TCL_STORAGE_CLASS
#define TCL_STORAGE_CLASS DLLEXPORT

/*
 * The maximum length of a sub-key name.
 */

#ifndef MAX_KEY_LENGTH
#define MAX_KEY_LENGTH		256
#endif

/*
 * The following macros convert between different endian ints.
 */

#define SWAPWORD(x)	MAKEWORD(HIBYTE(x), LOBYTE(x))
#define SWAPLONG(x)	MAKELONG(SWAPWORD(HIWORD(x)), SWAPWORD(LOWORD(x)))

/*
 * The following flag is used in OpenKeys to indicate that the specified key
 * should be created if it doesn't currently exist.
 */

#define REG_CREATE 1

/*
 * The following tables contain the mapping from registry root names to the
 * system predefined keys.
 */

static const char *const rootKeyNames[] = {
    "HKEY_LOCAL_MACHINE", "HKEY_USERS", "HKEY_CLASSES_ROOT",
    "HKEY_CURRENT_USER", "HKEY_CURRENT_CONFIG",
    "HKEY_PERFORMANCE_DATA", "HKEY_DYN_DATA", NULL
};

static const HKEY rootKeys[] = {
    HKEY_LOCAL_MACHINE, HKEY_USERS, HKEY_CLASSES_ROOT, HKEY_CURRENT_USER,
    HKEY_CURRENT_CONFIG, HKEY_PERFORMANCE_DATA, HKEY_DYN_DATA
};

static const char REGISTRY_ASSOC_KEY[] = "registry::command";

/*
 * The following table maps from registry types to strings. Note that the
 * indices for this array are the same as the constants for the known registry
 * types so we don't need a separate table to hold the mapping.
 */

static const char *const typeNames[] = {
    "none", "sz", "expand_sz", "binary", "dword",
    "dword_big_endian", "link", "multi_sz", "resource_list", NULL
};

static DWORD lastType = REG_RESOURCE_LIST;

/*
 * Declarations for functions defined in this file.
 */

static void		AppendSystemError(Tcl_Interp *interp, DWORD error);
static int		BroadcastValue(Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static DWORD		ConvertDWORD(DWORD type, DWORD value);
static void		DeleteCmd(ClientData clientData);
static int		DeleteKey(Tcl_Interp *interp, Tcl_Obj *keyNameObj,
			    REGSAM mode);
static int		DeleteValue(Tcl_Interp *interp, Tcl_Obj *keyNameObj,
			    Tcl_Obj *valueNameObj, REGSAM mode);
static int		GetKeyNames(Tcl_Interp *interp, Tcl_Obj *keyNameObj,
			    Tcl_Obj *patternObj, REGSAM mode);
static int		GetType(Tcl_Interp *interp, Tcl_Obj *keyNameObj,
			    Tcl_Obj *valueNameObj, REGSAM mode);
static int		GetValue(Tcl_Interp *interp, Tcl_Obj *keyNameObj,
			    Tcl_Obj *valueNameObj, REGSAM mode);
static int		GetValueNames(Tcl_Interp *interp, Tcl_Obj *keyNameObj,
			    Tcl_Obj *patternObj, REGSAM mode);
static int		OpenKey(Tcl_Interp *interp, Tcl_Obj *keyNameObj,
			    REGSAM mode, int flags, HKEY *keyPtr);
static DWORD		OpenSubKey(char *hostName, HKEY rootKey,
			    char *keyName, REGSAM mode, int flags,
			    HKEY *keyPtr);
static int		ParseKeyName(Tcl_Interp *interp, char *name,
			    char **hostNamePtr, HKEY *rootKeyPtr,
			    char **keyNamePtr);
static DWORD		RecursiveDeleteKey(HKEY hStartKey,
			    const TCHAR * pKeyName, REGSAM mode);
static int		RegistryObjCmd(ClientData clientData,
			    Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		SetValue(Tcl_Interp *interp, Tcl_Obj *keyNameObj,
			    Tcl_Obj *valueNameObj, Tcl_Obj *dataObj,
			    Tcl_Obj *typeObj, REGSAM mode);

EXTERN int		Registry_Init(Tcl_Interp *interp);
EXTERN int		Registry_Unload(Tcl_Interp *interp, int flags);

/*
 *----------------------------------------------------------------------
 *
 * Registry_Init --
 *
 *	This function initializes the registry command.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
Registry_Init(
    Tcl_Interp *interp)
{
    Tcl_Command cmd;

    if (Tcl_InitStubs(interp, "8.1", 0) == NULL) {
	return TCL_ERROR;
    }

    cmd = Tcl_CreateObjCommand(interp, "registry", RegistryObjCmd,
	    interp, DeleteCmd);
    Tcl_SetAssocData(interp, REGISTRY_ASSOC_KEY, NULL, cmd);
    return Tcl_PkgProvide(interp, "registry", "1.3.0");
}

/*
 *----------------------------------------------------------------------
 *
 * Registry_Unload --
 *
 *	This function removes the registry command.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	The registry command is deleted and the dll may be unloaded.
 *
 *----------------------------------------------------------------------
 */

int
Registry_Unload(
    Tcl_Interp *interp,		/* Interpreter for unloading */
    int flags)			/* Flags passed by the unload system */
{
    Tcl_Command cmd;
    Tcl_Obj *objv[3];

    /*
     * Unregister the registry package. There is no Tcl_PkgForget()
     */

    objv[0] = Tcl_NewStringObj("package", -1);
    objv[1] = Tcl_NewStringObj("forget", -1);
    objv[2] = Tcl_NewStringObj("registry", -1);
    Tcl_EvalObjv(interp, 3, objv, TCL_EVAL_GLOBAL);

    /*
     * Delete the originally registered command.
     */

    cmd = Tcl_GetAssocData(interp, REGISTRY_ASSOC_KEY, NULL);
    if (cmd != NULL) {
	Tcl_DeleteCommandFromToken(interp, cmd);
    }

    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * DeleteCmd --
 *
 *	Cleanup the interp command token so that unloading doesn't try to
 *	re-delete the command (which will crash).
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The unload command will not attempt to delete this command.
 *
 *----------------------------------------------------------------------
 */

static void
DeleteCmd(
    ClientData clientData)
{
    Tcl_Interp *interp = clientData;

    Tcl_SetAssocData(interp, REGISTRY_ASSOC_KEY, NULL, NULL);
}

/*
 *----------------------------------------------------------------------
 *
 * RegistryObjCmd --
 *
 *	This function implements the Tcl "registry" command.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
RegistryObjCmd(
    ClientData clientData,	/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument values. */
{
    int n = 1;
    int index, argc;
    REGSAM mode = 0;
    const char *errString = NULL;

    static const char *const subcommands[] = {
	"broadcast", "delete", "get", "keys", "set", "type", "values", NULL
    };
    enum SubCmdIdx {
	BroadcastIdx, DeleteIdx, GetIdx, KeysIdx, SetIdx, TypeIdx, ValuesIdx
    };
    static const char *const modes[] = {
	"-32bit", "-64bit", NULL
    };

    if (objc < 2) {
    wrongArgs:
	Tcl_WrongNumArgs(interp, 1, objv, "?-32bit|-64bit? option ?arg ...?");
	return TCL_ERROR;
    }

    if (Tcl_GetString(objv[n])[0] == '-') {
	if (Tcl_GetIndexFromObj(interp, objv[n++], modes, "mode", 0,
		&index) != TCL_OK) {
	    return TCL_ERROR;
	}
	switch (index) {
	case 0:			/* -32bit */
	    mode |= KEY_WOW64_32KEY;
	    break;
	case 1:			/* -64bit */
	    mode |= KEY_WOW64_64KEY;
	    break;
	}
	if (objc < 3) {
	    goto wrongArgs;
	}
    }

    if (Tcl_GetIndexFromObj(interp, objv[n++], subcommands, "option", 0,
	    &index) != TCL_OK) {
	return TCL_ERROR;
    }

    argc = (objc - n);
    switch (index) {
    case BroadcastIdx:		/* broadcast */
	if (argc == 1 || argc == 3) {
	    int res = BroadcastValue(interp, argc, objv + n);

	    if (res != TCL_BREAK) {
		return res;
	    }
	}
	errString = "keyName ?-timeout milliseconds?";
	break;
    case DeleteIdx:		/* delete */
	if (argc == 1) {
	    return DeleteKey(interp, objv[n], mode);
	} else if (argc == 2) {
	    return DeleteValue(interp, objv[n], objv[n+1], mode);
	}
	errString = "keyName ?valueName?";
	break;
    case GetIdx:		/* get */
	if (argc == 2) {
	    return GetValue(interp, objv[n], objv[n+1], mode);
	}
	errString = "keyName valueName";
	break;
    case KeysIdx:		/* keys */
	if (argc == 1) {
	    return GetKeyNames(interp, objv[n], NULL, mode);
	} else if (argc == 2) {
	    return GetKeyNames(interp, objv[n], objv[n+1], mode);
	}
	errString = "keyName ?pattern?";
	break;
    case SetIdx:		/* set */
	if (argc == 1) {
	    HKEY key;

	    /*
	     * Create the key and then close it immediately.
	     */

	    mode |= KEY_ALL_ACCESS;
	    if (OpenKey(interp, objv[n], mode, 1, &key) != TCL_OK) {
		return TCL_ERROR;
	    }
	    RegCloseKey(key);
	    return TCL_OK;
	} else if (argc == 3) {
	    return SetValue(interp, objv[n], objv[n+1], objv[n+2], NULL,
		    mode);
	} else if (argc == 4) {
	    return SetValue(interp, objv[n], objv[n+1], objv[n+2], objv[n+3],
		    mode);
	}
	errString = "keyName ?valueName data ?type??";
	break;
    case TypeIdx:		/* type */
	if (argc == 2) {
	    return GetType(interp, objv[n], objv[n+1], mode);
	}
	errString = "keyName valueName";
	break;
    case ValuesIdx:		/* values */
	if (argc == 1) {
	    return GetValueNames(interp, objv[n], NULL, mode);
	} else if (argc == 2) {
	    return GetValueNames(interp, objv[n], objv[n+1], mode);
	}
	errString = "keyName ?pattern?";
	break;
    }
    Tcl_WrongNumArgs(interp, (mode ? 3 : 2), objv, errString);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * DeleteKey --
 *
 *	This function deletes a registry key.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
DeleteKey(
    Tcl_Interp *interp,		/* Current interpreter. */
    Tcl_Obj *keyNameObj,	/* Name of key to delete. */
    REGSAM mode)		/* Mode flags to pass. */
{
    char *tail, *buffer, *hostName, *keyName;
    const TCHAR *nativeTail;
    HKEY rootKey, subkey;
    DWORD result;
    int length;
    Tcl_DString buf;
    REGSAM saveMode = mode;

    /*
     * Find the parent of the key being deleted and open it.
     */

    keyName = Tcl_GetStringFromObj(keyNameObj, &length);
    buffer = ckalloc(length + 1);
    strcpy(buffer, keyName);

    if (ParseKeyName(interp, buffer, &hostName, &rootKey,
	    &keyName) != TCL_OK) {
	ckfree(buffer);
	return TCL_ERROR;
    }

    if (*keyName == '\0') {
	Tcl_SetObjResult(interp,
		Tcl_NewStringObj("bad key: cannot delete root keys", -1));
	Tcl_SetErrorCode(interp, "WIN_REG", "DEL_ROOT_KEY", NULL);
	ckfree(buffer);
	return TCL_ERROR;
    }

    tail = strrchr(keyName, '\\');
    if (tail) {
	*tail++ = '\0';
    } else {
	tail = keyName;
	keyName = NULL;
    }

    mode |= KEY_ENUMERATE_SUB_KEYS | DELETE;
    result = OpenSubKey(hostName, rootKey, keyName, mode, 0, &subkey);
    if (result != ERROR_SUCCESS) {
	ckfree(buffer);
	if (result == ERROR_FILE_NOT_FOUND) {
	    return TCL_OK;
	}
	Tcl_SetObjResult(interp,
		Tcl_NewStringObj("unable to delete key: ", -1));
	AppendSystemError(interp, result);
	return TCL_ERROR;
    }

    /*
     * Now we recursively delete the key and everything below it.
     */

    nativeTail = Tcl_WinUtfToTChar(tail, -1, &buf);
    result = RecursiveDeleteKey(subkey, nativeTail, saveMode);
    Tcl_DStringFree(&buf);

    if (result != ERROR_SUCCESS && result != ERROR_FILE_NOT_FOUND) {
	Tcl_SetObjResult(interp,
		Tcl_NewStringObj("unable to delete key: ", -1));
	AppendSystemError(interp, result);
	result = TCL_ERROR;
    } else {
	result = TCL_OK;
    }

    RegCloseKey(subkey);
    ckfree(buffer);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * DeleteValue --
 *
 *	This function deletes a value from a registry key.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
DeleteValue(
    Tcl_Interp *interp,		/* Current interpreter. */
    Tcl_Obj *keyNameObj,	/* Name of key. */
    Tcl_Obj *valueNameObj,	/* Name of value to delete. */
    REGSAM mode)		/* Mode flags to pass. */
{
    HKEY key;
    char *valueName;
    int length;
    DWORD result;
    Tcl_DString ds;

    /*
     * Attempt to open the key for deletion.
     */

    mode |= KEY_SET_VALUE;
    if (OpenKey(interp, keyNameObj, mode, 0, &key) != TCL_OK) {
	return TCL_ERROR;
    }

    valueName = Tcl_GetStringFromObj(valueNameObj, &length);
    Tcl_WinUtfToTChar(valueName, length, &ds);
    result = RegDeleteValue(key, (const TCHAR *)Tcl_DStringValue(&ds));
    Tcl_DStringFree(&ds);
    if (result != ERROR_SUCCESS) {
	Tcl_AppendResult(interp, "unable to delete value \"",
		Tcl_GetString(valueNameObj), "\" from key \"",
		Tcl_GetString(keyNameObj), "\": ", NULL);
	AppendSystemError(interp, result);
	result = TCL_ERROR;
    } else {
	result = TCL_OK;
    }
    RegCloseKey(key);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * GetKeyNames --
 *
 *	This function enumerates the subkeys of a given key. If the optional
 *	pattern is supplied, then only keys that match the pattern will be
 *	returned.
 *
 * Results:
 *	Returns the list of subkeys in the result object of the interpreter,
 *	or an error message on failure.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
GetKeyNames(
    Tcl_Interp *interp,		/* Current interpreter. */
    Tcl_Obj *keyNameObj,	/* Key to enumerate. */
    Tcl_Obj *patternObj,	/* Optional match pattern. */
    REGSAM mode)		/* Mode flags to pass. */
{
    const char *pattern;	/* Pattern being matched against subkeys */
    HKEY key;			/* Handle to the key being examined */
    TCHAR buffer[MAX_KEY_LENGTH];		/* Buffer to hold the subkey name */
    DWORD bufSize;		/* Size of the buffer */
    DWORD index;		/* Position of the current subkey */
    char *name;			/* Subkey name */
    Tcl_Obj *resultPtr;		/* List of subkeys being accumulated */
    int result = TCL_OK;	/* Return value from this command */
    Tcl_DString ds;		/* Buffer to translate subkey name to UTF-8 */

    if (patternObj) {
	pattern = Tcl_GetString(patternObj);
    } else {
	pattern = NULL;
    }

    /*
     * Attempt to open the key for enumeration.
     */

    mode |= KEY_QUERY_VALUE | KEY_ENUMERATE_SUB_KEYS;
    if (OpenKey(interp, keyNameObj, mode, 0, &key) != TCL_OK) {
	return TCL_ERROR;
    }

    /*
     * Enumerate the subkeys.
     */

    resultPtr = Tcl_NewObj();
    for (index = 0;; ++index) {
	bufSize = MAX_KEY_LENGTH;
	result = RegEnumKeyEx(key, index, buffer, &bufSize,
		NULL, NULL, NULL, NULL);
	if (result != ERROR_SUCCESS) {
	    if (result == ERROR_NO_MORE_ITEMS) {
		result = TCL_OK;
	    } else {
		Tcl_SetObjResult(interp, Tcl_NewObj());
		Tcl_AppendResult(interp, "unable to enumerate subkeys of \"",
			Tcl_GetString(keyNameObj), "\": ", NULL);
		AppendSystemError(interp, result);
		result = TCL_ERROR;
	    }
	    break;
	}
	Tcl_WinTCharToUtf(buffer, bufSize * sizeof(TCHAR), &ds);
	name = Tcl_DStringValue(&ds);
	if (pattern && !Tcl_StringMatch(name, pattern)) {
	    Tcl_DStringFree(&ds);
	    continue;
	}
	result = Tcl_ListObjAppendElement(interp, resultPtr,
		Tcl_NewStringObj(name, Tcl_DStringLength(&ds)));
	Tcl_DStringFree(&ds);
	if (result != TCL_OK) {
	    break;
	}
    }
    if (result == TCL_OK) {
	Tcl_SetObjResult(interp, resultPtr);
    } else {
	Tcl_DecrRefCount(resultPtr); /* BUGFIX: Don't leak on failure. */
    }

    RegCloseKey(key);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * GetType --
 *
 *	This function gets the type of a given registry value and places it in
 *	the interpreter result.
 *
 * Results:
 *	Returns a normal Tcl result.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
GetType(
    Tcl_Interp *interp,		/* Current interpreter. */
    Tcl_Obj *keyNameObj,	/* Name of key. */
    Tcl_Obj *valueNameObj,	/* Name of value to get. */
    REGSAM mode)		/* Mode flags to pass. */
{
    HKEY key;
    DWORD result, type;
    Tcl_DString ds;
    const char *valueName;
    const TCHAR *nativeValue;
    int length;

    /*
     * Attempt to open the key for reading.
     */

    mode |= KEY_QUERY_VALUE;
    if (OpenKey(interp, keyNameObj, mode, 0, &key) != TCL_OK) {
	return TCL_ERROR;
    }

    /*
     * Get the type of the value.
     */

    valueName = Tcl_GetStringFromObj(valueNameObj, &length);
    nativeValue = Tcl_WinUtfToTChar(valueName, length, &ds);
    result = RegQueryValueEx(key, nativeValue, NULL, &type,
	    NULL, NULL);
    Tcl_DStringFree(&ds);
    RegCloseKey(key);

    if (result != ERROR_SUCCESS) {
	Tcl_AppendResult(interp, "unable to get type of value \"",
		Tcl_GetString(valueNameObj), "\" from key \"",
		Tcl_GetString(keyNameObj), "\": ", NULL);
	AppendSystemError(interp, result);
	return TCL_ERROR;
    }

    /*
     * Set the type into the result. Watch out for unknown types. If we don't
     * know about the type, just use the numeric value.
     */

    if (type > lastType) {
	Tcl_SetObjResult(interp, Tcl_NewIntObj((int) type));
    } else {
	Tcl_SetObjResult(interp, Tcl_NewStringObj(typeNames[type], -1));
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * GetValue --
 *
 *	This function gets the contents of a registry value and places a list
 *	containing the data and the type in the interpreter result.
 *
 * Results:
 *	Returns a normal Tcl result.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
GetValue(
    Tcl_Interp *interp,		/* Current interpreter. */
    Tcl_Obj *keyNameObj,	/* Name of key. */
    Tcl_Obj *valueNameObj,	/* Name of value to get. */
    REGSAM mode)		/* Mode flags to pass. */
{
    HKEY key;
    const char *valueName;
    const TCHAR *nativeValue;
    DWORD result, length, type;
    Tcl_DString data, buf;
    int nameLen;

    /*
     * Attempt to open the key for reading.
     */

    mode |= KEY_QUERY_VALUE;
    if (OpenKey(interp, keyNameObj, mode, 0, &key) != TCL_OK) {
	return TCL_ERROR;
    }

    /*
     * Initialize a Dstring to maximum statically allocated size we could get
     * one more byte by avoiding Tcl_DStringSetLength() and just setting
     * length to TCL_DSTRING_STATIC_SIZE, but this should be safer if the
     * implementation of Dstrings changes.
     *
     * This allows short values to be read from the registy in one call.
     * Longer values need a second call with an expanded DString.
     */

    Tcl_DStringInit(&data);
    Tcl_DStringSetLength(&data, TCL_DSTRING_STATIC_SIZE - 1);
    length = TCL_DSTRING_STATIC_SIZE/sizeof(TCHAR) - 1;

    valueName = Tcl_GetStringFromObj(valueNameObj, &nameLen);
    nativeValue = Tcl_WinUtfToTChar(valueName, nameLen, &buf);

    result = RegQueryValueEx(key, nativeValue, NULL, &type,
	    (BYTE *) Tcl_DStringValue(&data), &length);
    while (result == ERROR_MORE_DATA) {
	/*
	 * The Windows docs say that in this error case, we just need to
	 * expand our buffer and request more data. Required for
	 * HKEY_PERFORMANCE_DATA
	 */

	length *= 2;
	Tcl_DStringSetLength(&data, (int) length * sizeof(TCHAR));
	result = RegQueryValueEx(key, nativeValue,
		NULL, &type, (BYTE *) Tcl_DStringValue(&data), &length);
    }
    Tcl_DStringFree(&buf);
    RegCloseKey(key);
    if (result != ERROR_SUCCESS) {
	Tcl_AppendResult(interp, "unable to get value \"",
		Tcl_GetString(valueNameObj), "\" from key \"",
		Tcl_GetString(keyNameObj), "\": ", NULL);
	AppendSystemError(interp, result);
	Tcl_DStringFree(&data);
	return TCL_ERROR;
    }

    /*
     * If the data is a 32-bit quantity, store it as an integer object. If it
     * is a multi-string, store it as a list of strings. For null-terminated
     * strings, append up the to first null. Otherwise, store it as a binary
     * string.
     */

    if (type == REG_DWORD || type == REG_DWORD_BIG_ENDIAN) {
	Tcl_SetObjResult(interp, Tcl_NewIntObj((int) ConvertDWORD(type,
		*((DWORD *) Tcl_DStringValue(&data)))));
    } else if (type == REG_MULTI_SZ) {
	char *p = Tcl_DStringValue(&data);
	char *end = Tcl_DStringValue(&data) + length;
	Tcl_Obj *resultPtr = Tcl_NewObj();

	/*
	 * Multistrings are stored as an array of null-terminated strings,
	 * terminated by two null characters. Also do a bounds check in case
	 * we get bogus data.
	 */

	while ((p < end)
		&& (*((Tcl_UniChar *) p)) != 0) {
	    Tcl_UniChar *up;
	    Tcl_WinTCharToUtf((TCHAR *) p, -1, &buf);
	    Tcl_ListObjAppendElement(interp, resultPtr,
		    Tcl_NewStringObj(Tcl_DStringValue(&buf),
			    Tcl_DStringLength(&buf)));
	    up = (Tcl_UniChar *) p;

	    while (*up++ != 0) {}
	    p = (char *) up;
	    Tcl_DStringFree(&buf);
	}
	Tcl_SetObjResult(interp, resultPtr);
    } else if ((type == REG_SZ) || (type == REG_EXPAND_SZ)) {
	Tcl_WinTCharToUtf((TCHAR *) Tcl_DStringValue(&data), -1, &buf);
	Tcl_DStringResult(interp, &buf);
    } else {
	/*
	 * Save binary data as a byte array.
	 */

	Tcl_SetObjResult(interp, Tcl_NewByteArrayObj(
		(BYTE *) Tcl_DStringValue(&data), (int) length));
    }
    Tcl_DStringFree(&data);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * GetValueNames --
 *
 *	This function enumerates the values of the a given key. If the
 *	optional pattern is supplied, then only value names that match the
 *	pattern will be returned.
 *
 * Results:
 *	Returns the list of value names in the result object of the
 *	interpreter, or an error message on failure.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
GetValueNames(
    Tcl_Interp *interp,		/* Current interpreter. */
    Tcl_Obj *keyNameObj,	/* Key to enumerate. */
    Tcl_Obj *patternObj,	/* Optional match pattern. */
    REGSAM mode)		/* Mode flags to pass. */
{
    HKEY key;
    Tcl_Obj *resultPtr;
    DWORD index, size, result;
    Tcl_DString buffer, ds;
    const char *pattern, *name;

    /*
     * Attempt to open the key for enumeration.
     */

    mode |= KEY_QUERY_VALUE;
    if (OpenKey(interp, keyNameObj, mode, 0, &key) != TCL_OK) {
	return TCL_ERROR;
    }

    resultPtr = Tcl_NewObj();
    Tcl_DStringInit(&buffer);
    Tcl_DStringSetLength(&buffer, (int) (MAX_KEY_LENGTH * sizeof(TCHAR)));
    index = 0;
    result = TCL_OK;

    if (patternObj) {
	pattern = Tcl_GetString(patternObj);
    } else {
	pattern = NULL;
    }

    /*
     * Enumerate the values under the given subkey until we get an error,
     * indicating the end of the list. Note that we need to reset size after
     * each iteration because RegEnumValue smashes the old value.
     */

    size = MAX_KEY_LENGTH;
    while (RegEnumValue(key,index, (TCHAR *)Tcl_DStringValue(&buffer),
	    &size, NULL, NULL, NULL, NULL) == ERROR_SUCCESS) {
	size *= sizeof(TCHAR);

	Tcl_WinTCharToUtf((TCHAR *) Tcl_DStringValue(&buffer), (int) size,
		&ds);
	name = Tcl_DStringValue(&ds);
	if (!pattern || Tcl_StringMatch(name, pattern)) {
	    result = Tcl_ListObjAppendElement(interp, resultPtr,
		    Tcl_NewStringObj(name, Tcl_DStringLength(&ds)));
	    if (result != TCL_OK) {
		Tcl_DStringFree(&ds);
		break;
	    }
	}
	Tcl_DStringFree(&ds);

	index++;
	size = MAX_KEY_LENGTH;
    }
    Tcl_SetObjResult(interp, resultPtr);
    Tcl_DStringFree(&buffer);
    RegCloseKey(key);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * OpenKey --
 *
 *	This function opens the specified key. This function is a simple
 *	wrapper around ParseKeyName and OpenSubKey.
 *
 * Results:
 *	Returns the opened key in the keyPtr argument and a Tcl result code.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
OpenKey(
    Tcl_Interp *interp,		/* Current interpreter. */
    Tcl_Obj *keyNameObj,	/* Key to open. */
    REGSAM mode,		/* Access mode. */
    int flags,			/* 0 or REG_CREATE. */
    HKEY *keyPtr)		/* Returned HKEY. */
{
    char *keyName, *buffer, *hostName;
    int length;
    HKEY rootKey;
    DWORD result;

    keyName = Tcl_GetStringFromObj(keyNameObj, &length);
    buffer = ckalloc(length + 1);
    strcpy(buffer, keyName);

    result = ParseKeyName(interp, buffer, &hostName, &rootKey, &keyName);
    if (result == TCL_OK) {
	result = OpenSubKey(hostName, rootKey, keyName, mode, flags, keyPtr);
	if (result != ERROR_SUCCESS) {
	    Tcl_SetObjResult(interp,
		    Tcl_NewStringObj("unable to open key: ", -1));
	    AppendSystemError(interp, result);
	    result = TCL_ERROR;
	} else {
	    result = TCL_OK;
	}
    }

    ckfree(buffer);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * OpenSubKey --
 *
 *	This function opens a given subkey of a root key on the specified
 *	host.
 *
 * Results:
 *	Returns the opened key in the keyPtr and a Windows error code as the
 *	return value.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static DWORD
OpenSubKey(
    char *hostName,		/* Host to access, or NULL for local. */
    HKEY rootKey,		/* Root registry key. */
    char *keyName,		/* Subkey name. */
    REGSAM mode,		/* Access mode. */
    int flags,			/* 0 or REG_CREATE. */
    HKEY *keyPtr)		/* Returned HKEY. */
{
    DWORD result;
    Tcl_DString buf;

    /*
     * Attempt to open the root key on a remote host if necessary.
     */

    if (hostName) {
	hostName = (char *) Tcl_WinUtfToTChar(hostName, -1, &buf);
	result = RegConnectRegistry((TCHAR *)hostName, rootKey,
		&rootKey);
	Tcl_DStringFree(&buf);
	if (result != ERROR_SUCCESS) {
	    return result;
	}
    }

    /*
     * Now open the specified key with the requested permissions. Note that
     * this key must be closed by the caller.
     */

    keyName = (char *) Tcl_WinUtfToTChar(keyName, -1, &buf);
    if (flags & REG_CREATE) {
	DWORD create;

	result = RegCreateKeyEx(rootKey, (TCHAR *)keyName, 0, NULL,
		REG_OPTION_NON_VOLATILE, mode, NULL, keyPtr, &create);
    } else if (rootKey == HKEY_PERFORMANCE_DATA) {
	/*
	 * Here we fudge it for this special root key. See MSDN for more info
	 * on HKEY_PERFORMANCE_DATA and the peculiarities surrounding it.
	 */

	*keyPtr = HKEY_PERFORMANCE_DATA;
	result = ERROR_SUCCESS;
    } else {
	result = RegOpenKeyEx(rootKey, (TCHAR *)keyName, 0, mode,
		keyPtr);
    }
    Tcl_DStringFree(&buf);

    /*
     * Be sure to close the root key since we are done with it now.
     */

    if (hostName) {
	RegCloseKey(rootKey);
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * ParseKeyName --
 *
 *	This function parses a key name into the host, root, and subkey parts.
 *
 * Results:
 *	The pointers to the start of the host and subkey names are returned in
 *	the hostNamePtr and keyNamePtr variables. The specified root HKEY is
 *	returned in rootKeyPtr. Returns a standard Tcl result.
 *
 * Side effects:
 *	Modifies the name string by inserting nulls.
 *
 *----------------------------------------------------------------------
 */

static int
ParseKeyName(
    Tcl_Interp *interp,		/* Current interpreter. */
    char *name,
    char **hostNamePtr,
    HKEY *rootKeyPtr,
    char **keyNamePtr)
{
    char *rootName;
    int result, index;
    Tcl_Obj *rootObj;

    /*
     * Split the key into host and root portions.
     */

    *hostNamePtr = *keyNamePtr = rootName = NULL;
    if (name[0] == '\\') {
	if (name[1] == '\\') {
	    *hostNamePtr = name;
	    for (rootName = name+2; *rootName != '\0'; rootName++) {
		if (*rootName == '\\') {
		    *rootName++ = '\0';
		    break;
		}
	    }
	}
    } else {
	rootName = name;
    }
    if (!rootName) {
	Tcl_AppendResult(interp, "bad key \"", name,
		"\": must start with a valid root", NULL);
	Tcl_SetErrorCode(interp, "WIN_REG", "NO_ROOT_KEY", NULL);
	return TCL_ERROR;
    }

    /*
     * Split the root into root and subkey portions.
     */

    for (*keyNamePtr = rootName; **keyNamePtr != '\0'; (*keyNamePtr)++) {
	if (**keyNamePtr == '\\') {
	    **keyNamePtr = '\0';
	    (*keyNamePtr)++;
	    break;
	}
    }

    /*
     * Look for a matching root name.
     */

    rootObj = Tcl_NewStringObj(rootName, -1);
    result = Tcl_GetIndexFromObj(interp, rootObj, rootKeyNames, "root name",
	    TCL_EXACT, &index);
    Tcl_DecrRefCount(rootObj);
    if (result != TCL_OK) {
	return TCL_ERROR;
    }
    *rootKeyPtr = rootKeys[index];
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * RecursiveDeleteKey --
 *
 *	This function recursively deletes all the keys below a starting key.
 *	Although Windows 95 does this automatically, we still need to do this
 *	for Windows NT.
 *
 * Results:
 *	Returns a Windows error code.
 *
 * Side effects:
 *	Deletes all of the keys and values below the given key.
 *
 *----------------------------------------------------------------------
 */

static DWORD
RecursiveDeleteKey(
    HKEY startKey,		/* Parent of key to be deleted. */
    const TCHAR *keyName,	/* Name of key to be deleted in external
				 * encoding, not UTF. */
    REGSAM mode)		/* Mode flags to pass. */
{
    DWORD result, size;
    Tcl_DString subkey;
    HKEY hKey;
    REGSAM saveMode = mode;
    static int checkExProc = 0;
    static FARPROC regDeleteKeyExProc = NULL;

    /*
     * Do not allow NULL or empty key name.
     */

    if (!keyName || *keyName == '\0') {
	return ERROR_BADKEY;
    }

    mode |= KEY_ENUMERATE_SUB_KEYS | DELETE | KEY_QUERY_VALUE;
    result = RegOpenKeyEx(startKey, keyName, 0, mode, &hKey);
    if (result != ERROR_SUCCESS) {
	return result;
    }

    Tcl_DStringInit(&subkey);
    Tcl_DStringSetLength(&subkey, (int) (MAX_KEY_LENGTH * sizeof(TCHAR)));

    mode = saveMode;
    while (result == ERROR_SUCCESS) {
	/*
	 * Always get index 0 because key deletion changes ordering.
	 */

	size = MAX_KEY_LENGTH;
	result = RegEnumKeyEx(hKey, 0, (TCHAR *)Tcl_DStringValue(&subkey),
		&size, NULL, NULL, NULL, NULL);
	if (result == ERROR_NO_MORE_ITEMS) {
	    /*
	     * RegDeleteKeyEx doesn't exist on non-64bit XP platforms, so we
	     * can't compile with it in. We need to check for it at runtime
	     * and use it if we find it.
	     */

	    if (mode && !checkExProc) {
		HINSTANCE dllH;

		checkExProc = 1;
		dllH = LoadLibrary(TEXT("advapi32.dll"));
		if (dllH) {
		    regDeleteKeyExProc = (FARPROC)
			    GetProcAddress(dllH, "RegDeleteKeyExW");
		}
	    }
	    if (mode && regDeleteKeyExProc) {
		result = regDeleteKeyExProc(startKey, keyName, mode, 0);
	    } else {
		result = RegDeleteKey(startKey, keyName);
	    }
	    break;
	} else if (result == ERROR_SUCCESS) {
	    result = RecursiveDeleteKey(hKey, (const TCHAR *) Tcl_DStringValue(&subkey),
		    mode);
	}
    }
    Tcl_DStringFree(&subkey);
    RegCloseKey(hKey);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * SetValue --
 *
 *	This function sets the contents of a registry value. If the key or
 *	value does not exist, it will be created. If it does exist, then the
 *	data and type will be replaced.
 *
 * Results:
 *	Returns a normal Tcl result.
 *
 * Side effects:
 *	May create new keys or values.
 *
 *----------------------------------------------------------------------
 */

static int
SetValue(
    Tcl_Interp *interp,		/* Current interpreter. */
    Tcl_Obj *keyNameObj,	/* Name of key. */
    Tcl_Obj *valueNameObj,	/* Name of value to set. */
    Tcl_Obj *dataObj,		/* Data to be written. */
    Tcl_Obj *typeObj,		/* Type of data to be written. */
    REGSAM mode)		/* Mode flags to pass. */
{
    int type, length;
    DWORD result;
    HKEY key;
    const char *valueName;
    Tcl_DString nameBuf;

    if (typeObj == NULL) {
	type = REG_SZ;
    } else if (Tcl_GetIndexFromObj(interp, typeObj, typeNames, "type",
	    0, (int *) &type) != TCL_OK) {
	if (Tcl_GetIntFromObj(NULL, typeObj, (int *) &type) != TCL_OK) {
	    return TCL_ERROR;
	}
	Tcl_ResetResult(interp);
    }
    mode |= KEY_ALL_ACCESS;
    if (OpenKey(interp, keyNameObj, mode, 1, &key) != TCL_OK) {
	return TCL_ERROR;
    }

    valueName = Tcl_GetStringFromObj(valueNameObj, &length);
    valueName = (char *) Tcl_WinUtfToTChar(valueName, length, &nameBuf);

    if (type == REG_DWORD || type == REG_DWORD_BIG_ENDIAN) {
	int value;

	if (Tcl_GetIntFromObj(interp, dataObj, &value) != TCL_OK) {
	    RegCloseKey(key);
	    Tcl_DStringFree(&nameBuf);
	    return TCL_ERROR;
	}

	value = ConvertDWORD((DWORD)type, (DWORD)value);
	result = RegSetValueEx(key, (TCHAR *)valueName, 0,
		(DWORD) type, (BYTE *) &value, sizeof(DWORD));
    } else if (type == REG_MULTI_SZ) {
	Tcl_DString data, buf;
	int objc, i;
	Tcl_Obj **objv;

	if (Tcl_ListObjGetElements(interp, dataObj, &objc, &objv) != TCL_OK) {
	    RegCloseKey(key);
	    Tcl_DStringFree(&nameBuf);
	    return TCL_ERROR;
	}

	/*
	 * Append the elements as null terminated strings. Note that we must
	 * not assume the length of the string in case there are embedded
	 * nulls, which aren't allowed in REG_MULTI_SZ values.
	 */

	Tcl_DStringInit(&data);
	for (i = 0; i < objc; i++) {
	    TclDStringAppendObj(&data, objv[i]);

	    /*
	     * Add a null character to separate this value from the next. We
	     * accomplish this by growing the string by one byte. Since the
	     * DString always tacks on an extra null byte, the new byte will
	     * already be set to null.
	     */

	    Tcl_DStringSetLength(&data, Tcl_DStringLength(&data)+1);
	}

	Tcl_WinUtfToTChar(Tcl_DStringValue(&data), Tcl_DStringLength(&data)+1,
		&buf);
	result = RegSetValueEx(key, (TCHAR *)valueName, 0,
		(DWORD) type, (BYTE *) Tcl_DStringValue(&buf),
		(DWORD) Tcl_DStringLength(&buf));
	Tcl_DStringFree(&data);
	Tcl_DStringFree(&buf);
    } else if (type == REG_SZ || type == REG_EXPAND_SZ) {
	Tcl_DString buf;
	const char *data = Tcl_GetStringFromObj(dataObj, &length);

	data = (char *)Tcl_WinUtfToTChar(data, length, &buf);

	/*
	 * Include the null in the length, padding if needed for Unicode.
	 */

	Tcl_DStringSetLength(&buf, Tcl_DStringLength(&buf)+1);
	length = Tcl_DStringLength(&buf) + 1;

	result = RegSetValueEx(key, (TCHAR *)valueName, 0,
		(DWORD) type, (BYTE *) data, (DWORD) length);
	Tcl_DStringFree(&buf);
    } else {
	BYTE *data;

	/*
	 * Store binary data in the registry.
	 */

	data = (BYTE *) Tcl_GetByteArrayFromObj(dataObj, &length);
	result = RegSetValueEx(key, (TCHAR *)valueName, 0,
		(DWORD) type, data, (DWORD) length);
    }

    Tcl_DStringFree(&nameBuf);
    RegCloseKey(key);

    if (result != ERROR_SUCCESS) {
	Tcl_SetObjResult(interp,
		Tcl_NewStringObj("unable to set value: ", -1));
	AppendSystemError(interp, result);
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * BroadcastValue --
 *
 *	This function broadcasts a WM_SETTINGCHANGE message to indicate to
 *	other programs that we have changed the contents of a registry value.
 *
 * Results:
 *	Returns a normal Tcl result.
 *
 * Side effects:
 *	Will cause other programs to reload their system settings.
 *
 *----------------------------------------------------------------------
 */

static int
BroadcastValue(
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument values. */
{
    LRESULT result;
    DWORD_PTR sendResult;
    UINT timeout = 3000;
    int len;
    const char *str;
    Tcl_Obj *objPtr;

    if (objc == 3) {
	str = Tcl_GetStringFromObj(objv[1], &len);
	if ((len < 2) || (*str != '-')
		|| strncmp(str, "-timeout", (size_t) len)) {
	    return TCL_BREAK;
	}
	if (Tcl_GetIntFromObj(interp, objv[2], (int *) &timeout) != TCL_OK) {
	    return TCL_ERROR;
	}
    }

    str = Tcl_GetStringFromObj(objv[0], &len);
    if (len == 0) {
	str = NULL;
    }

    /*
     * Use the ignore the result.
     */

    result = SendMessageTimeoutA(HWND_BROADCAST, WM_SETTINGCHANGE,
	    (WPARAM) 0, (LPARAM) str, SMTO_ABORTIFHUNG, timeout, &sendResult);

    objPtr = Tcl_NewObj();
    Tcl_ListObjAppendElement(NULL, objPtr, Tcl_NewLongObj((long) result));
    Tcl_ListObjAppendElement(NULL, objPtr, Tcl_NewLongObj((long) sendResult));
    Tcl_SetObjResult(interp, objPtr);

    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * AppendSystemError --
 *
 *	This routine formats a Windows system error message and places it into
 *	the interpreter result.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static void
AppendSystemError(
    Tcl_Interp *interp,		/* Current interpreter. */
    DWORD error)		/* Result code from error. */
{
    int length;
    TCHAR *tMsgPtr, **tMsgPtrPtr = &tMsgPtr;
    const char *msg;
    char id[TCL_INTEGER_SPACE], msgBuf[24 + TCL_INTEGER_SPACE];
    Tcl_DString ds;
    Tcl_Obj *resultPtr = Tcl_GetObjResult(interp);

    if (Tcl_IsShared(resultPtr)) {
	resultPtr = Tcl_DuplicateObj(resultPtr);
    }
    length = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM
	    | FORMAT_MESSAGE_ALLOCATE_BUFFER, NULL, error,
	    MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (TCHAR *) tMsgPtrPtr,
	    0, NULL);
    if (length == 0) {
	sprintf(msgBuf, "unknown error: %ld", error);
	msg = msgBuf;
    } else {
	char *msgPtr;

	Tcl_WinTCharToUtf(tMsgPtr, -1, &ds);
	LocalFree(tMsgPtr);

	msgPtr = Tcl_DStringValue(&ds);
	length = Tcl_DStringLength(&ds);

	/*
	 * Trim the trailing CR/LF from the system message.
	 */

	if (msgPtr[length-1] == '\n') {
	    --length;
	}
	if (msgPtr[length-1] == '\r') {
	    --length;
	}
	msgPtr[length] = 0;
	msg = msgPtr;
    }

    sprintf(id, "%ld", error);
    Tcl_SetErrorCode(interp, "WINDOWS", id, msg, NULL);
    Tcl_AppendToObj(resultPtr, msg, length);
    Tcl_SetObjResult(interp, resultPtr);

    if (length != 0) {
	Tcl_DStringFree(&ds);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * ConvertDWORD --
 *
 *	This function determines whether a DWORD needs to be byte swapped, and
 *	returns the appropriately swapped value.
 *
 * Results:
 *	Returns a converted DWORD.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static DWORD
ConvertDWORD(
    DWORD type,			/* Either REG_DWORD or REG_DWORD_BIG_ENDIAN */
    DWORD value)		/* The value to be converted. */
{
    DWORD order = 1;
    DWORD localType;

    /*
     * Check to see if the low bit is in the first byte.
     */

    localType = (*((char *) &order) == 1) ? REG_DWORD : REG_DWORD_BIG_ENDIAN;
    return (type != localType) ? (DWORD) SWAPLONG(value) : value;
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */