summaryrefslogtreecommitdiffstats
path: root/generic/tclTestObj.c
blob: 73ef3c4b4af55bb1aa8d01cc4db6a44a93cf6276 (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
/*
 * tclTestObj.c --
 *
 *	This file contains C command functions for the additional Tcl commands
 *	that are used for testing implementations of the Tcl object types.
 *	These commands are not normally included in Tcl applications; they're
 *	only used for testing.
 *
 * Copyright (c) 1995-1998 Sun Microsystems, Inc.
 * Copyright (c) 1999 by Scriptics Corporation.
 * Copyright (c) 2005 by Kevin B. Kenny.  All rights reserved.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclTestObj.c,v 1.17 2007/03/07 22:03:25 nijtmans Exp $
 */

#include "tclInt.h"
#include "tommath.h"

/*
 * An array of Tcl_Obj pointers used in the commands that operate on or get
 * the values of Tcl object-valued variables. varPtr[i] is the i-th variable's
 * Tcl_Obj *.
 */

#define NUMBER_OF_OBJECT_VARS 20
static Tcl_Obj *varPtr[NUMBER_OF_OBJECT_VARS];

/*
 * Forward declarations for functions defined later in this file:
 */

static int		CheckIfVarUnset(Tcl_Interp *interp, int varIndex);
static int		GetVariableIndex(Tcl_Interp *interp,
			    char *string, int *indexPtr);
static void		SetVarToObj(int varIndex, Tcl_Obj *objPtr);
int			TclObjTest_Init(Tcl_Interp *interp);
static int		TestbignumobjCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		TestbooleanobjCmd(ClientData dummy,
			    Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
#if 0
static int		TestconvertobjCmd(ClientData dummy,
			    Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
#endif
static int		TestdoubleobjCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		TestindexobjCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		TestintobjCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		TestobjCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		TeststringobjCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);

typedef struct TestString {
    int numChars;
    size_t allocated;
    size_t uallocated;
    Tcl_UniChar unicode[2];
} TestString;

/*
 *----------------------------------------------------------------------
 *
 * TclObjTest_Init --
 *
 *	This function creates additional commands that are used to test the
 *	Tcl object support.
 *
 * Results:
 *	Returns a standard Tcl completion code, and leaves an error
 *	message in the interp's result if an error occurs.
 *
 * Side effects:
 *	Creates and registers several new testing commands.
 *
 *----------------------------------------------------------------------
 */

int
TclObjTest_Init(interp)
    Tcl_Interp *interp;
{
    register int i;

    for (i = 0;  i < NUMBER_OF_OBJECT_VARS;  i++) {
        varPtr[i] = NULL;
    }

    Tcl_CreateObjCommand(interp, "testbignumobj", TestbignumobjCmd,
	    (ClientData) 0, NULL);
    Tcl_CreateObjCommand(interp, "testbooleanobj", TestbooleanobjCmd,
	    (ClientData) 0, NULL);
#if 0
    Tcl_CreateObjCommand(interp, "testconvertobj", TestconvertobjCmd,
	    (ClientData) 0, NULL);
#endif
    Tcl_CreateObjCommand(interp, "testdoubleobj", TestdoubleobjCmd,
	    (ClientData) 0, NULL);
    Tcl_CreateObjCommand(interp, "testintobj", TestintobjCmd,
	    (ClientData) 0, NULL);
    Tcl_CreateObjCommand(interp, "testindexobj", TestindexobjCmd,
	    (ClientData) 0, NULL);
    Tcl_CreateObjCommand(interp, "testobj", TestobjCmd, (ClientData) 0, NULL);
    Tcl_CreateObjCommand(interp, "teststringobj", TeststringobjCmd,
	    (ClientData) 0, NULL);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TestbignumobjCmd --
 *
 *	This function implmenets the "testbignumobj" command.  It is used
 *	to exercise the bignum Tcl object type implementation.
 *
 * Results:
 *	Returns a standard Tcl object result.
 *
 * Side effects:
 *	Creates and frees bignum objects; converts objects to have bignum
 *	type.
 *
 *----------------------------------------------------------------------
 */

static int
TestbignumobjCmd( clientData, interp, objc, objv )
    ClientData clientData;	/* unused */
    Tcl_Interp* interp;		/* Tcl interpreter */
    int objc;			/* Argument count */
    Tcl_Obj* const objv[];	/* Argument vector */
{
    const char * subcmds[] = {
	"set",      "get",      "mult10",      "div10", NULL
    };
    enum options {
	BIGNUM_SET, BIGNUM_GET, BIGNUM_MULT10, BIGNUM_DIV10
    };

    int index, varIndex;
    char* string;
    mp_int bignumValue, newValue;

    if (objc < 3) {
	Tcl_WrongNumArgs(interp, 1, objv, "option ?arg?...");
	return TCL_ERROR;
    }
    if (Tcl_GetIndexFromObj(interp, objv[1], subcmds, "option", 0,
	    &index) != TCL_OK) {
	return TCL_ERROR;
    }
    string = Tcl_GetString(objv[2]);
    if (GetVariableIndex(interp, string, &varIndex) != TCL_OK) {
	return TCL_ERROR;
    }

    switch (index) {
    case BIGNUM_SET:
	if (objc != 4) {
	    Tcl_WrongNumArgs(interp, 2, objv, "var value");
	    return TCL_ERROR;
	}
	string = Tcl_GetString(objv[3]);
	if (mp_init(&bignumValue) != MP_OKAY) {
	    Tcl_SetObjResult(interp,
		    Tcl_NewStringObj("error in mp_init", -1));
	    return TCL_ERROR;
	}
	if (mp_read_radix(&bignumValue, string, 10) != MP_OKAY) {
	    mp_clear(&bignumValue);
	    Tcl_SetObjResult(interp,
		    Tcl_NewStringObj("error in mp_read_radix", -1));
	    return TCL_ERROR;
	}

	/*
	 * If the object currently bound to the variable with index varIndex
	 * has ref count 1 (i.e. the object is unshared) we can modify that
	 * object directly.  Otherwise, if RC>1 (i.e. the object is shared),
	 * we must create a new object to modify/set and decrement the old
	 * formerly-shared object's ref count. This is "copy on write".
	 */

	if ((varPtr[varIndex] != NULL) && !Tcl_IsShared(varPtr[varIndex])) {
	    Tcl_SetBignumObj(varPtr[varIndex], &bignumValue);
	} else {
	    SetVarToObj(varIndex, Tcl_NewBignumObj(&bignumValue));
	}
	break;

    case BIGNUM_GET:
	if (objc != 3) {
	    Tcl_WrongNumArgs(interp, 2, objv, "varIndex");
	    return TCL_ERROR;
	}
	if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	break;

    case BIGNUM_MULT10:
	if (objc != 3) {
	    Tcl_WrongNumArgs(interp, 2, objv, "varIndex");
	    return TCL_ERROR;
	}
	if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	if (Tcl_GetBignumFromObj(interp, varPtr[varIndex],
		&bignumValue) != TCL_OK) {
	    return TCL_ERROR;
	}
	if (mp_init(&newValue) != MP_OKAY
		|| (mp_mul_d(&bignumValue, 10, &newValue) != MP_OKAY)) {
	    mp_clear(&bignumValue);
	    mp_clear(&newValue);
	    Tcl_SetObjResult(interp,
		    Tcl_NewStringObj("error in mp_mul_d", -1));
	    return TCL_ERROR;
	}
	mp_clear(&bignumValue);
	if (!Tcl_IsShared(varPtr[varIndex])) {
	    Tcl_SetBignumObj(varPtr[varIndex], &newValue);
	} else {
	    SetVarToObj(varIndex, Tcl_NewBignumObj(&newValue));
	}
	break;

    case BIGNUM_DIV10:
	if (objc != 3) {
	    Tcl_WrongNumArgs(interp, 2, objv, "varIndex");
	    return TCL_ERROR;
	}
	if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	if (Tcl_GetBignumFromObj(interp, varPtr[varIndex],
		&bignumValue) != TCL_OK) {
	    return TCL_ERROR;
	}
	if (mp_init(&newValue) != MP_OKAY
		|| (mp_div_d(&bignumValue, 10, &newValue, NULL) != MP_OKAY)) {
	    mp_clear(&bignumValue);
	    mp_clear(&newValue);
	    Tcl_SetObjResult(interp,
		    Tcl_NewStringObj("error in mp_div_d", -1));
	    return TCL_ERROR;
	}
	mp_clear(&bignumValue);
	if (!Tcl_IsShared(varPtr[varIndex])) {
	    Tcl_SetBignumObj(varPtr[varIndex], &newValue);
	} else {
	    SetVarToObj(varIndex, Tcl_NewBignumObj(&newValue));
	}
    }

    Tcl_SetObjResult(interp, varPtr[varIndex]);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TestbooleanobjCmd --
 *
 *	This function implements the "testbooleanobj" command.  It is used to
 *	test the boolean Tcl object type implementation.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	Creates and frees boolean objects, and also converts objects to
 *	have boolean type.
 *
 *----------------------------------------------------------------------
 */

static int
TestbooleanobjCmd(clientData, interp, objc, objv)
    ClientData clientData;	/* Not used. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int objc;			/* Number of arguments. */
    Tcl_Obj *const objv[];	/* Argument objects. */
{
    int varIndex, boolValue;
    char *index, *subCmd;

    if (objc < 3) {
	wrongNumArgs:
	Tcl_WrongNumArgs(interp, 1, objv, "option arg ?arg ...?");
	return TCL_ERROR;
    }

    index = Tcl_GetString(objv[2]);
    if (GetVariableIndex(interp, index, &varIndex) != TCL_OK) {
	return TCL_ERROR;
    }

    subCmd = Tcl_GetString(objv[1]);
    if (strcmp(subCmd, "set") == 0) {
	if (objc != 4) {
	    goto wrongNumArgs;
	}
	if (Tcl_GetBooleanFromObj(interp, objv[3], &boolValue) != TCL_OK) {
	    return TCL_ERROR;
	}

	/*
	 * If the object currently bound to the variable with index varIndex
	 * has ref count 1 (i.e. the object is unshared) we can modify that
	 * object directly. Otherwise, if RC>1 (i.e. the object is shared),
	 * we must create a new object to modify/set and decrement the old
	 * formerly-shared object's ref count. This is "copy on write".
	 */

	if ((varPtr[varIndex] != NULL) && !Tcl_IsShared(varPtr[varIndex])) {
	    Tcl_SetBooleanObj(varPtr[varIndex], boolValue);
	} else {
	    SetVarToObj(varIndex, Tcl_NewBooleanObj(boolValue));
	}
	Tcl_SetObjResult(interp, varPtr[varIndex]);
    } else if (strcmp(subCmd, "get") == 0) {
	if (objc != 3) {
	    goto wrongNumArgs;
	}
	if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	Tcl_SetObjResult(interp, varPtr[varIndex]);
    } else if (strcmp(subCmd, "not") == 0) {
	if (objc != 3) {
	    goto wrongNumArgs;
	}
	if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	if (Tcl_GetBooleanFromObj(interp, varPtr[varIndex],
				  &boolValue) != TCL_OK) {
	    return TCL_ERROR;
	}
	if (!Tcl_IsShared(varPtr[varIndex])) {
	    Tcl_SetBooleanObj(varPtr[varIndex], !boolValue);
	} else {
	    SetVarToObj(varIndex, Tcl_NewBooleanObj(!boolValue));
	}
	Tcl_SetObjResult(interp, varPtr[varIndex]);
    } else {
	Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
		"bad option \"", Tcl_GetString(objv[1]),
		"\": must be set, get, or not", NULL);
	return TCL_ERROR;
    }
    return TCL_OK;
}

#if 0
/*
 *----------------------------------------------------------------------
 *
 * TestconvertobjCmd --
 *
 *	This function implements the "testconvertobj" command. It is used to
 *	test converting objects to new types.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	Converts objects to new types.
 *
 *----------------------------------------------------------------------
 */

static int
TestconvertobjCmd(clientData, interp, objc, objv)
    ClientData clientData;	/* Not used. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int objc;			/* Number of arguments. */
    Tcl_Obj *const objv[];	/* Argument objects. */
{
    char *subCmd;
    char buf[20];

    if (objc < 3) {
	wrongNumArgs:
	Tcl_WrongNumArgs(interp, 1, objv, "option arg ?arg ...?");
	return TCL_ERROR;
    }

    subCmd = Tcl_GetString(objv[1]);
    if (strcmp(subCmd, "double") == 0) {
	double d;

	if (objc != 3) {
	    goto wrongNumArgs;
	}
	if (Tcl_GetDoubleFromObj(interp, objv[2], &d) != TCL_OK) {
	    return TCL_ERROR;
	}
	sprintf(buf, "%f", d);
        Tcl_AppendToObj(Tcl_GetObjResult(interp), buf, -1);
    } else {
	Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
		"bad option \"", Tcl_GetString(objv[1]),
		"\": must be double", NULL);
	return TCL_ERROR;
    }
    return TCL_OK;
}
#endif

/*
 *----------------------------------------------------------------------
 *
 * TestdoubleobjCmd --
 *
 *	This function implements the "testdoubleobj" command.  It is used to
 *	test the double-precision floating point Tcl object type
 *	implementation.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	Creates and frees double objects, and also converts objects to
 *	have double type.
 *
 *----------------------------------------------------------------------
 */

static int
TestdoubleobjCmd(clientData, interp, objc, objv)
    ClientData clientData;	/* Not used. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int objc;			/* Number of arguments. */
    Tcl_Obj *const objv[];	/* Argument objects. */
{
    int varIndex;
    double doubleValue;
    char *index, *subCmd, *string;

    if (objc < 3) {
	wrongNumArgs:
	Tcl_WrongNumArgs(interp, 1, objv, "option arg ?arg ...?");
	return TCL_ERROR;
    }

    index = Tcl_GetString(objv[2]);
    if (GetVariableIndex(interp, index, &varIndex) != TCL_OK) {
	return TCL_ERROR;
    }

    subCmd = Tcl_GetString(objv[1]);
    if (strcmp(subCmd, "set") == 0) {
	if (objc != 4) {
	    goto wrongNumArgs;
	}
	string = Tcl_GetString(objv[3]);
	if (Tcl_GetDouble(interp, string, &doubleValue) != TCL_OK) {
	    return TCL_ERROR;
	}

	/*
	 * If the object currently bound to the variable with index varIndex
	 * has ref count 1 (i.e. the object is unshared) we can modify that
	 * object directly. Otherwise, if RC>1 (i.e. the object is shared), we
	 * must create a new object to modify/set and decrement the old
	 * formerly-shared object's ref count. This is "copy on write".
	 */

	if ((varPtr[varIndex] != NULL) && !Tcl_IsShared(varPtr[varIndex])) {
	    Tcl_SetDoubleObj(varPtr[varIndex], doubleValue);
	} else {
	    SetVarToObj(varIndex, Tcl_NewDoubleObj(doubleValue));
	}
	Tcl_SetObjResult(interp, varPtr[varIndex]);
    } else if (strcmp(subCmd, "get") == 0) {
	if (objc != 3) {
	    goto wrongNumArgs;
	}
	if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	Tcl_SetObjResult(interp, varPtr[varIndex]);
    } else if (strcmp(subCmd, "mult10") == 0) {
	if (objc != 3) {
	    goto wrongNumArgs;
	}
	if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	if (Tcl_GetDoubleFromObj(interp, varPtr[varIndex],
				 &doubleValue) != TCL_OK) {
	    return TCL_ERROR;
	}
	if (!Tcl_IsShared(varPtr[varIndex])) {
	    Tcl_SetDoubleObj(varPtr[varIndex], (doubleValue * 10.0));
	} else {
	    SetVarToObj(varIndex, Tcl_NewDoubleObj( (doubleValue * 10.0) ));
	}
	Tcl_SetObjResult(interp, varPtr[varIndex]);
    } else if (strcmp(subCmd, "div10") == 0) {
	if (objc != 3) {
	    goto wrongNumArgs;
	}
	if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	if (Tcl_GetDoubleFromObj(interp, varPtr[varIndex],
				 &doubleValue) != TCL_OK) {
	    return TCL_ERROR;
	}
	if (!Tcl_IsShared(varPtr[varIndex])) {
	    Tcl_SetDoubleObj(varPtr[varIndex], (doubleValue / 10.0));
	} else {
	    SetVarToObj(varIndex, Tcl_NewDoubleObj( (doubleValue / 10.0) ));
	}
	Tcl_SetObjResult(interp, varPtr[varIndex]);
    } else {
	Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
		"bad option \"", Tcl_GetString(objv[1]),
		"\": must be set, get, mult10, or div10", NULL);
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TestindexobjCmd --
 *
 *	This function implements the "testindexobj" command. It is used to
 *	test the index Tcl object type implementation.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	Creates and frees int objects, and also converts objects to
 *	have int type.
 *
 *----------------------------------------------------------------------
 */

static int
TestindexobjCmd(clientData, interp, objc, objv)
    ClientData clientData;	/* Not used. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int objc;			/* Number of arguments. */
    Tcl_Obj *const objv[];	/* Argument objects. */
{
    int allowAbbrev, index, index2, setError, i, result;
    const char **argv;
    static const char *tablePtr[] = {"a", "b", "check", NULL};
    /*
     * Keep this structure declaration in sync with tclIndexObj.c
     */
    struct IndexRep {
	VOID *tablePtr;			/* Pointer to the table of strings */
	int offset;			/* Offset between table entries */
	int index;			/* Selected index into table. */
    };
    struct IndexRep *indexRep;

    if ((objc == 3) && (strcmp(Tcl_GetString(objv[1]),
	    "check") == 0)) {
	/*
	 * This code checks to be sure that the results of Tcl_GetIndexFromObj
	 * are properly cached in the object and returned on subsequent
	 * lookups.
	 */

	if (Tcl_GetIntFromObj(interp, objv[2], &index2) != TCL_OK) {
	    return TCL_ERROR;
	}

	Tcl_GetIndexFromObj(NULL, objv[1], tablePtr, "token", 0, &index);
	indexRep = (struct IndexRep *) objv[1]->internalRep.otherValuePtr;
	indexRep->index = index2;
	result = Tcl_GetIndexFromObj(NULL, objv[1],
		tablePtr, "token", 0, &index);
	if (result == TCL_OK) {
	    Tcl_SetIntObj(Tcl_GetObjResult(interp), index);
	}
	return result;
    }

    if (objc < 5) {
	Tcl_AppendToObj(Tcl_GetObjResult(interp), "wrong # args", -1);
	return TCL_ERROR;
    }

    if (Tcl_GetBooleanFromObj(interp, objv[1], &setError) != TCL_OK) {
	return TCL_ERROR;
    }
    if (Tcl_GetBooleanFromObj(interp, objv[2], &allowAbbrev) != TCL_OK) {
	return TCL_ERROR;
    }

    argv = (const char **) ckalloc((unsigned) ((objc-3) * sizeof(char *)));
    for (i = 4; i < objc; i++) {
	argv[i-4] = Tcl_GetString(objv[i]);
    }
    argv[objc-4] = NULL;

    /*
     * Tcl_GetIndexFromObj assumes that the table is statically-allocated so
     * that its address is different for each index object. If we accidently
     * allocate a table at the same address as that cached in the index
     * object, clear out the object's cached state.
     */

    if ( objv[3]->typePtr != NULL
	 && !strcmp( "index", objv[3]->typePtr->name ) ) {
	indexRep = (struct IndexRep *) objv[3]->internalRep.otherValuePtr;
	if (indexRep->tablePtr == (VOID *) argv) {
	    objv[3]->typePtr->freeIntRepProc(objv[3]);
	    objv[3]->typePtr = NULL;
	}
    }

    result = Tcl_GetIndexFromObj((setError? interp : NULL), objv[3],
	    argv, "token", (allowAbbrev? 0 : TCL_EXACT), &index);
    ckfree((char *) argv);
    if (result == TCL_OK) {
	Tcl_SetIntObj(Tcl_GetObjResult(interp), index);
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * TestintobjCmd --
 *
 *	This function implements the "testintobj" command. It is used to
 *	test the int Tcl object type implementation.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	Creates and frees int objects, and also converts objects to
 *	have int type.
 *
 *----------------------------------------------------------------------
 */

static int
TestintobjCmd(clientData, interp, objc, objv)
    ClientData clientData;	/* Not used. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int objc;			/* Number of arguments. */
    Tcl_Obj *const objv[];	/* Argument objects. */
{
    int intValue, varIndex, i;
    long longValue;
    char *index, *subCmd, *string;

    if (objc < 3) {
	wrongNumArgs:
	Tcl_WrongNumArgs(interp, 1, objv, "option arg ?arg ...?");
	return TCL_ERROR;
    }

    index = Tcl_GetString(objv[2]);
    if (GetVariableIndex(interp, index, &varIndex) != TCL_OK) {
	return TCL_ERROR;
    }

    subCmd = Tcl_GetString(objv[1]);
    if (strcmp(subCmd, "set") == 0) {
	if (objc != 4) {
	    goto wrongNumArgs;
	}
	string = Tcl_GetString(objv[3]);
	if (Tcl_GetInt(interp, string, &i) != TCL_OK) {
	    return TCL_ERROR;
	}
	intValue = i;

	/*
	 * If the object currently bound to the variable with index varIndex
	 * has ref count 1 (i.e. the object is unshared) we can modify that
	 * object directly. Otherwise, if RC>1 (i.e. the object is shared), we
	 * must create a new object to modify/set and decrement the old
	 * formerly-shared object's ref count. This is "copy on write".
	 */

	if ((varPtr[varIndex] != NULL) && !Tcl_IsShared(varPtr[varIndex])) {
	    Tcl_SetIntObj(varPtr[varIndex], intValue);
	} else {
	    SetVarToObj(varIndex, Tcl_NewIntObj(intValue));
	}
	Tcl_SetObjResult(interp, varPtr[varIndex]);
    } else if (strcmp(subCmd, "set2") == 0) { /* doesn't set result */
	if (objc != 4) {
	    goto wrongNumArgs;
	}
	string = Tcl_GetString(objv[3]);
	if (Tcl_GetInt(interp, string, &i) != TCL_OK) {
	    return TCL_ERROR;
	}
	intValue = i;
	if ((varPtr[varIndex] != NULL) && !Tcl_IsShared(varPtr[varIndex])) {
	    Tcl_SetIntObj(varPtr[varIndex], intValue);
	} else {
	    SetVarToObj(varIndex, Tcl_NewIntObj(intValue));
	}
    } else if (strcmp(subCmd, "setlong") == 0) {
	if (objc != 4) {
	    goto wrongNumArgs;
	}
	string = Tcl_GetString(objv[3]);
	if (Tcl_GetInt(interp, string, &i) != TCL_OK) {
	    return TCL_ERROR;
	}
	intValue = i;
	if ((varPtr[varIndex] != NULL) && !Tcl_IsShared(varPtr[varIndex])) {
	    Tcl_SetLongObj(varPtr[varIndex], intValue);
	} else {
	    SetVarToObj(varIndex, Tcl_NewLongObj(intValue));
	}
	Tcl_SetObjResult(interp, varPtr[varIndex]);
    } else if (strcmp(subCmd, "setmaxlong") == 0) {
	long maxLong = LONG_MAX;
	if (objc != 3) {
	    goto wrongNumArgs;
	}
	if ((varPtr[varIndex] != NULL) && !Tcl_IsShared(varPtr[varIndex])) {
	    Tcl_SetLongObj(varPtr[varIndex], maxLong);
	} else {
	    SetVarToObj(varIndex, Tcl_NewLongObj(maxLong));
	}
    } else if (strcmp(subCmd, "ismaxlong") == 0) {
	if (objc != 3) {
	    goto wrongNumArgs;
	}
	if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	if (Tcl_GetLongFromObj(interp, varPtr[varIndex], &longValue) != TCL_OK) {
	    return TCL_ERROR;
	}
	Tcl_AppendToObj(Tcl_GetObjResult(interp),
	        ((longValue == LONG_MAX)? "1" : "0"), -1);
    } else if (strcmp(subCmd, "get") == 0) {
	if (objc != 3) {
	    goto wrongNumArgs;
	}
	if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	Tcl_SetObjResult(interp, varPtr[varIndex]);
    } else if (strcmp(subCmd, "get2") == 0) {
	if (objc != 3) {
	    goto wrongNumArgs;
	}
	if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	string = Tcl_GetString(varPtr[varIndex]);
	Tcl_AppendToObj(Tcl_GetObjResult(interp), string, -1);
    } else if (strcmp(subCmd, "inttoobigtest") == 0) {
	/*
	 * If long ints have more bits than ints on this platform, verify that
	 * Tcl_GetIntFromObj returns an error if the long int held in an
	 * integer object's internal representation is too large to fit in an
	 * int.
	 */

	if (objc != 3) {
	    goto wrongNumArgs;
	}
#if (INT_MAX == LONG_MAX)   /* int is same size as long int */
	Tcl_AppendToObj(Tcl_GetObjResult(interp), "1", -1);
#else
	if ((varPtr[varIndex] != NULL) && !Tcl_IsShared(varPtr[varIndex])) {
	    Tcl_SetLongObj(varPtr[varIndex], LONG_MAX);
	} else {
	    SetVarToObj(varIndex, Tcl_NewLongObj(LONG_MAX));
	}
	if (Tcl_GetIntFromObj(interp, varPtr[varIndex], &i) != TCL_OK) {
	    Tcl_ResetResult(interp);
	    Tcl_AppendToObj(Tcl_GetObjResult(interp), "1", -1);
	    return TCL_OK;
	}
	Tcl_AppendToObj(Tcl_GetObjResult(interp), "0", -1);
#endif
    } else if (strcmp(subCmd, "mult10") == 0) {
	if (objc != 3) {
	    goto wrongNumArgs;
	}
	if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	if (Tcl_GetIntFromObj(interp, varPtr[varIndex],
			      &intValue) != TCL_OK) {
	    return TCL_ERROR;
	}
	if (!Tcl_IsShared(varPtr[varIndex])) {
	    Tcl_SetIntObj(varPtr[varIndex], (intValue * 10));
	} else {
	    SetVarToObj(varIndex, Tcl_NewIntObj( (intValue * 10) ));
	}
	Tcl_SetObjResult(interp, varPtr[varIndex]);
    } else if (strcmp(subCmd, "div10") == 0) {
	if (objc != 3) {
	    goto wrongNumArgs;
	}
	if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	if (Tcl_GetIntFromObj(interp, varPtr[varIndex],
			      &intValue) != TCL_OK) {
	    return TCL_ERROR;
	}
	if (!Tcl_IsShared(varPtr[varIndex])) {
	    Tcl_SetIntObj(varPtr[varIndex], (intValue / 10));
	} else {
	    SetVarToObj(varIndex, Tcl_NewIntObj( (intValue / 10) ));
	}
	Tcl_SetObjResult(interp, varPtr[varIndex]);
    } else {
	Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
		"bad option \"", Tcl_GetString(objv[1]),
		"\": must be set, get, get2, mult10, or div10", NULL);
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TestobjCmd --
 *
 *	This function implements the "testobj" command. It is used to test
 *	the type-independent portions of the Tcl object type implementation.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	Creates and frees objects.
 *
 *----------------------------------------------------------------------
 */

static int
TestobjCmd(clientData, interp, objc, objv)
    ClientData clientData;	/* Not used. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int objc;			/* Number of arguments. */
    Tcl_Obj *const objv[];	/* Argument objects. */
{
    int varIndex, destIndex, i;
    char *index, *subCmd, *string;
    Tcl_ObjType *targetType;

    if (objc < 2) {
	wrongNumArgs:
	Tcl_WrongNumArgs(interp, 1, objv, "option arg ?arg ...?");
	return TCL_ERROR;
    }

    subCmd = Tcl_GetString(objv[1]);
    if (strcmp(subCmd, "assign") == 0) {
        if (objc != 4) {
            goto wrongNumArgs;
        }
        index = Tcl_GetString(objv[2]);
        if (GetVariableIndex(interp, index, &varIndex) != TCL_OK) {
            return TCL_ERROR;
        }
        if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	string = Tcl_GetString(objv[3]);
        if (GetVariableIndex(interp, string, &destIndex) != TCL_OK) {
            return TCL_ERROR;
        }
        SetVarToObj(destIndex, varPtr[varIndex]);
	Tcl_SetObjResult(interp, varPtr[destIndex]);
     } else if (strcmp(subCmd, "convert") == 0) {
        char *typeName;
        if (objc != 4) {
            goto wrongNumArgs;
        }
        index = Tcl_GetString(objv[2]);
        if (GetVariableIndex(interp, index, &varIndex) != TCL_OK) {
            return TCL_ERROR;
        }
        if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
        typeName = Tcl_GetString(objv[3]);
        if ((targetType = Tcl_GetObjType(typeName)) == NULL) {
	    Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
		    "no type ", typeName, " found", NULL);
            return TCL_ERROR;
        }
        if (Tcl_ConvertToType(interp, varPtr[varIndex], targetType)
            != TCL_OK) {
            return TCL_ERROR;
        }
	Tcl_SetObjResult(interp, varPtr[varIndex]);
    } else if (strcmp(subCmd, "duplicate") == 0) {
        if (objc != 4) {
            goto wrongNumArgs;
        }
        index = Tcl_GetString(objv[2]);
        if (GetVariableIndex(interp, index, &varIndex) != TCL_OK) {
            return TCL_ERROR;
        }
        if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	string = Tcl_GetString(objv[3]);
        if (GetVariableIndex(interp, string, &destIndex) != TCL_OK) {
            return TCL_ERROR;
        }
        SetVarToObj(destIndex, Tcl_DuplicateObj(varPtr[varIndex]));
	Tcl_SetObjResult(interp, varPtr[destIndex]);
    } else if (strcmp(subCmd, "freeallvars") == 0) {
        if (objc != 2) {
            goto wrongNumArgs;
        }
        for (i = 0;  i < NUMBER_OF_OBJECT_VARS;  i++) {
            if (varPtr[i] != NULL) {
                Tcl_DecrRefCount(varPtr[i]);
                varPtr[i] = NULL;
            }
        }
    } else if ( strcmp ( subCmd, "invalidateStringRep" ) == 0 ) {
	if ( objc != 3 ) {
	    goto wrongNumArgs;
	}
	index = Tcl_GetString( objv[2] );
	if ( GetVariableIndex( interp, index, &varIndex ) != TCL_OK ) {
	    return TCL_ERROR;
	}
        if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	Tcl_InvalidateStringRep( varPtr[varIndex] );
	Tcl_SetObjResult( interp, varPtr[varIndex] );
    } else if (strcmp(subCmd, "newobj") == 0) {
        if (objc != 3) {
            goto wrongNumArgs;
        }
        index = Tcl_GetString(objv[2]);
        if (GetVariableIndex(interp, index, &varIndex) != TCL_OK) {
            return TCL_ERROR;
        }
        SetVarToObj(varIndex, Tcl_NewObj());
	Tcl_SetObjResult(interp, varPtr[varIndex]);
    } else if (strcmp(subCmd, "objtype") == 0) {
	const char *typeName;

	/*
	 * return an object containing the name of the argument's type
	 * of internal rep.  If none exists, return "none".
	 */

        if (objc != 3) {
            goto wrongNumArgs;
        }
	if (objv[2]->typePtr == NULL) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj("none", -1));
	} else {
	    typeName = objv[2]->typePtr->name;
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(typeName, -1));
	}
    } else if (strcmp(subCmd, "refcount") == 0) {
	char buf[TCL_INTEGER_SPACE];

        if (objc != 3) {
            goto wrongNumArgs;
        }
        index = Tcl_GetString(objv[2]);
        if (GetVariableIndex(interp, index, &varIndex) != TCL_OK) {
            return TCL_ERROR;
        }
        if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
	TclFormatInt(buf, varPtr[varIndex]->refCount);
        Tcl_SetResult(interp, buf, TCL_VOLATILE);
    } else if (strcmp(subCmd, "type") == 0) {
        if (objc != 3) {
            goto wrongNumArgs;
        }
        index = Tcl_GetString(objv[2]);
        if (GetVariableIndex(interp, index, &varIndex) != TCL_OK) {
            return TCL_ERROR;
        }
        if (CheckIfVarUnset(interp, varIndex)) {
	    return TCL_ERROR;
	}
        if (varPtr[varIndex]->typePtr == NULL) { /* a string! */
	    Tcl_AppendToObj(Tcl_GetObjResult(interp), "string", -1);
        } else {
            Tcl_AppendToObj(Tcl_GetObjResult(interp),
                    varPtr[varIndex]->typePtr->name, -1);
        }
    } else if (strcmp(subCmd, "types") == 0) {
        if (objc != 2) {
            goto wrongNumArgs;
        }
	if (Tcl_AppendAllObjTypes(interp,
		Tcl_GetObjResult(interp)) != TCL_OK) {
	    return TCL_ERROR;
	}
    } else {
	Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
		"bad option \"", Tcl_GetString(objv[1]),
		"\": must be assign, convert, duplicate, freeallvars, ",
		"newobj, objcount, objtype, refcount, type, or types", NULL);
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TeststringobjCmd --
 *
 *	This function implements the "teststringobj" command. It is used to
 *	test the string Tcl object type implementation.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	Creates and frees string objects, and also converts objects to
 *	have string type.
 *
 *----------------------------------------------------------------------
 */

static int
TeststringobjCmd(clientData, interp, objc, objv)
    ClientData clientData;	/* Not used. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int objc;			/* Number of arguments. */
    Tcl_Obj *const objv[];	/* Argument objects. */
{
    int varIndex, option, i, length;
#define MAX_STRINGS 11
    char *index, *string, *strings[MAX_STRINGS+1];
    TestString *strPtr;
    static const char *options[] = {
	"append", "appendstrings", "get", "get2", "length", "length2",
	"set", "set2", "setlength", "ualloc", "getunicode", NULL
    };

    if (objc < 3) {
	wrongNumArgs:
	Tcl_WrongNumArgs(interp, 1, objv, "option arg ?arg ...?");
	return TCL_ERROR;
    }

    index = Tcl_GetString(objv[2]);
    if (GetVariableIndex(interp, index, &varIndex) != TCL_OK) {
	return TCL_ERROR;
    }

    if (Tcl_GetIndexFromObj(interp, objv[1], options, "option", 0, &option)
	    != TCL_OK) {
	return TCL_ERROR;
    }
    switch (option) {
	case 0:				/* append */
	    if (objc != 5) {
		goto wrongNumArgs;
	    }
	    if (Tcl_GetIntFromObj(interp, objv[4], &length) != TCL_OK) {
		return TCL_ERROR;
	    }
	    if (varPtr[varIndex] == NULL) {
		SetVarToObj(varIndex, Tcl_NewObj());
	    }

	    /*
	     * If the object bound to variable "varIndex" is shared, we must
	     * "copy on write" and append to a copy of the object.
	     */

	    if (Tcl_IsShared(varPtr[varIndex])) {
		SetVarToObj(varIndex, Tcl_DuplicateObj(varPtr[varIndex]));
	    }
	    string = Tcl_GetString(objv[3]);
	    Tcl_AppendToObj(varPtr[varIndex], string, length);
	    Tcl_SetObjResult(interp, varPtr[varIndex]);
	    break;
	case 1:				/* appendstrings */
	    if (objc > (MAX_STRINGS+3)) {
		goto wrongNumArgs;
	    }
	    if (varPtr[varIndex] == NULL) {
		SetVarToObj(varIndex, Tcl_NewObj());
	    }

	    /*
	     * If the object bound to variable "varIndex" is shared, we must
	     * "copy on write" and append to a copy of the object.
	     */

	    if (Tcl_IsShared(varPtr[varIndex])) {
		SetVarToObj(varIndex, Tcl_DuplicateObj(varPtr[varIndex]));
	    }
	    for (i = 3;  i < objc;  i++) {
		strings[i-3] = Tcl_GetString(objv[i]);
	    }
	    for ( ; i < 12 + 3; i++) {
		strings[i - 3] = NULL;
	    }
	    Tcl_AppendStringsToObj(varPtr[varIndex], strings[0], strings[1],
		    strings[2], strings[3], strings[4], strings[5],
		    strings[6], strings[7], strings[8], strings[9],
		    strings[10], strings[11]);
	    Tcl_SetObjResult(interp, varPtr[varIndex]);
	    break;
	case 2:				/* get */
	    if (objc != 3) {
		goto wrongNumArgs;
	    }
	    if (CheckIfVarUnset(interp, varIndex)) {
		return TCL_ERROR;
	    }
	    Tcl_SetObjResult(interp, varPtr[varIndex]);
	    break;
	case 3:				/* get2 */
	    if (objc != 3) {
		goto wrongNumArgs;
	    }
	    if (CheckIfVarUnset(interp, varIndex)) {
		return TCL_ERROR;
	    }
	    string = Tcl_GetString(varPtr[varIndex]);
	    Tcl_AppendToObj(Tcl_GetObjResult(interp), string, -1);
	    break;
	case 4:				/* length */
	    if (objc != 3) {
		goto wrongNumArgs;
	    }
	    Tcl_SetIntObj(Tcl_GetObjResult(interp), (varPtr[varIndex] != NULL)
		    ? varPtr[varIndex]->length : -1);
	    break;
	case 5:				/* length2 */
	    if (objc != 3) {
		goto wrongNumArgs;
	    }
	    if (varPtr[varIndex] != NULL) {
		strPtr = (TestString *)
		    (varPtr[varIndex])->internalRep.otherValuePtr;
		length = (int) strPtr->allocated;
	    } else {
		length = -1;
	    }
	    Tcl_SetIntObj(Tcl_GetObjResult(interp), length);
	    break;
	case 6:				/* set */
	    if (objc != 4) {
		goto wrongNumArgs;
	    }

	    /*
	     * If the object currently bound to the variable with index
	     * varIndex has ref count 1 (i.e. the object is unshared) we can
	     * modify that object directly. Otherwise, if RC>1 (i.e. the
	     * object is shared), we must create a new object to modify/set
	     * and decrement the old formerly-shared object's ref count. This
	     * is "copy on write".
	     */

	    string = Tcl_GetStringFromObj(objv[3], &length);
	    if ((varPtr[varIndex] != NULL)
		    && !Tcl_IsShared(varPtr[varIndex])) {
		Tcl_SetStringObj(varPtr[varIndex], string, length);
	    } else {
		SetVarToObj(varIndex, Tcl_NewStringObj(string, length));
	    }
	    Tcl_SetObjResult(interp, varPtr[varIndex]);
	    break;
	case 7:				/* set2 */
	    if (objc != 4) {
		goto wrongNumArgs;
	    }
	    SetVarToObj(varIndex, objv[3]);
	    break;
	case 8:				/* setlength */
	    if (objc != 4) {
		goto wrongNumArgs;
	    }
	    if (Tcl_GetIntFromObj(interp, objv[3], &length) != TCL_OK) {
		return TCL_ERROR;
	    }
	    if (varPtr[varIndex] != NULL) {
		Tcl_SetObjLength(varPtr[varIndex], length);
	    }
	    break;
	case 9:				/* ualloc */
	    if (objc != 3) {
		goto wrongNumArgs;
	    }
	    if (varPtr[varIndex] != NULL) {
		strPtr = (TestString *)
		    (varPtr[varIndex])->internalRep.otherValuePtr;
		length = (int) strPtr->uallocated;
	    } else {
		length = -1;
	    }
	    Tcl_SetIntObj(Tcl_GetObjResult(interp), length);
	    break;
	case 10:			/* getunicode */
	    if (objc != 3) {
		goto wrongNumArgs;
	    }
	    Tcl_GetUnicodeFromObj(varPtr[varIndex], NULL);
	    break;
    }

    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * SetVarToObj --
 *
 *	Utility routine to assign a Tcl_Obj* to a test variable. The
 *	Tcl_Obj* can be NULL.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	This routine handles ref counting details for assignment: i.e. the old
 *	value's ref count must be decremented (if not NULL) and the new one
 *	incremented (also if not NULL).
 *
 *----------------------------------------------------------------------
 */

static void
SetVarToObj(varIndex, objPtr)
    int varIndex;		/* Designates the assignment variable. */
    Tcl_Obj *objPtr;		/* Points to object to assign to var. */
{
    if (varPtr[varIndex] != NULL) {
	Tcl_DecrRefCount(varPtr[varIndex]);
    }
    varPtr[varIndex] = objPtr;
    if (objPtr != NULL) {
	Tcl_IncrRefCount(objPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * GetVariableIndex --
 *
 *	Utility routine to get a test variable index from the command line.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
GetVariableIndex(interp, string, indexPtr)
    Tcl_Interp *interp;         /* Interpreter for error reporting. */
    char *string;               /* String containing a variable index
				 * specified as a nonnegative number less
				 * than NUMBER_OF_OBJECT_VARS. */
    int *indexPtr;              /* Place to store converted result. */
{
    int index;

    if (Tcl_GetInt(interp, string, &index) != TCL_OK) {
	return TCL_ERROR;
    }
    if (index < 0 || index >= NUMBER_OF_OBJECT_VARS) {
	Tcl_ResetResult(interp);
	Tcl_AppendToObj(Tcl_GetObjResult(interp), "bad variable index", -1);
	return TCL_ERROR;
    }

    *indexPtr = index;
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * CheckIfVarUnset --
 *
 *	Utility function that checks whether a test variable is readable:
 *	i.e., that varPtr[varIndex] is non-NULL.
 *
 * Results:
 *	1 if the test variable is unset (NULL); 0 otherwise.
 *
 * Side effects:
 *	Sets the interpreter result to an error message if the variable is
 *	unset (NULL).
 *
 *----------------------------------------------------------------------
 */

static int
CheckIfVarUnset(interp, varIndex)
    Tcl_Interp *interp;		/* Interpreter for error reporting. */
    int varIndex;		/* Index of the test variable to check. */
{
    if (varPtr[varIndex] == NULL) {
	char buf[32 + TCL_INTEGER_SPACE];

	sprintf(buf, "variable %d is unset (NULL)", varIndex);
	Tcl_ResetResult(interp);
	Tcl_AppendToObj(Tcl_GetObjResult(interp), buf, -1);
	return 1;
    }
    return 0;
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */