summaryrefslogtreecommitdiffstats
path: root/generic/tclCmdIL.c
blob: 47076ec289b090b057c65c66ce0a9398908849b6 (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
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
/*
 * tclCmdIL.c --
 *
 *	This file contains the top-level command routines for most of the Tcl
 *	built-in commands whose names begin with the letters I through L. It
 *	contains only commands in the generic core (i.e., those that don't
 *	depend much upon UNIX facilities).
 *
 * Copyright (c) 1987-1993 The Regents of the University of California.
 * Copyright (c) 1993-1997 Lucent Technologies.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 * Copyright (c) 1998-1999 by Scriptics Corporation.
 * Copyright (c) 2001 by Kevin B. Kenny. All rights reserved.
 * Copyright (c) 2005 Donal K. Fellows.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tclInt.h"
#include "tclRegexp.h"

/*
 * During execution of the "lsort" command, structures of the following type
 * are used to arrange the objects being sorted into a collection of linked
 * lists.
 */

typedef struct SortElement {
    union {			/* The value that we sorting by. */
	const char *strValuePtr;
	Tcl_WideInt wideValue;
	double doubleValue;
	Tcl_Obj *objValuePtr;
    } collationKey;
    union {			/* Object being sorted, or its index. */
	Tcl_Obj *objPtr;
	int index;
    } payload;
    struct SortElement *nextPtr;/* Next element in the list, or NULL for end
				 * of list. */
} SortElement;

/*
 * These function pointer types are used with the "lsearch" and "lsort"
 * commands to facilitate the "-nocase" option.
 */

typedef int (*SortStrCmpFn_t) (const char *, const char *);
typedef int (*SortMemCmpFn_t) (const void *, const void *, size_t);

/*
 * The "lsort" command needs to pass certain information down to the function
 * that compares two list elements, and the comparison function needs to pass
 * success or failure information back up to the top-level "lsort" command.
 * The following structure is used to pass this information.
 */

typedef struct SortInfo {
    int isIncreasing;		/* Nonzero means sort in increasing order. */
    int sortMode;		/* The sort mode. One of SORTMODE_* values
				 * defined below. */
    Tcl_Obj *compareCmdPtr;	/* The Tcl comparison command when sortMode is
				 * SORTMODE_COMMAND. Pre-initialized to hold
				 * base of command. */
    int *indexv;		/* If the -index option was specified, this
				 * holds the indexes contained in the list
				 * supplied as an argument to that option.
				 * NULL if no indexes supplied, and points to
				 * singleIndex field when only one
				 * supplied. */
    int indexc;			/* Number of indexes in indexv array. */
    int singleIndex;		/* Static space for common index case. */
    int unique;
    int numElements;
    Tcl_Interp *interp;		/* The interpreter in which the sort is being
				 * done. */
    int resultCode;		/* Completion code for the lsort command. If
				 * an error occurs during the sort this is
				 * changed from TCL_OK to TCL_ERROR. */
} SortInfo;

/*
 * The "sortMode" field of the SortInfo structure can take on any of the
 * following values.
 */

#define SORTMODE_ASCII		0
#define SORTMODE_INTEGER	1
#define SORTMODE_REAL		2
#define SORTMODE_COMMAND	3
#define SORTMODE_DICTIONARY	4
#define SORTMODE_ASCII_NC	8

/*
 * Magic values for the index field of the SortInfo structure. Note that the
 * index "end-1" will be translated to SORTIDX_END-1, etc.
 */

#define SORTIDX_NONE	-1	/* Not indexed; use whole value. */
#define SORTIDX_END	-2	/* Indexed from end. */

/*
 * Forward declarations for procedures defined in this file:
 */

static int		DictionaryCompare(const char *left, const char *right);
static Tcl_NRPostProc	IfConditionCallback;
static int		InfoArgsCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoBodyCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoCmdCountCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoCommandsCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoCompleteCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoDefaultCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
/* TIP #348 - New 'info' subcommand 'errorstack' */
static int		InfoErrorStackCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
/* TIP #280 - New 'info' subcommand 'frame' */
static int		InfoFrameCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoFunctionsCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoHostnameCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoLevelCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoLibraryCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoLoadedCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoNameOfExecutableCmd(ClientData dummy,
			    Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		InfoPatchLevelCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoProcsCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoScriptCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoSharedlibCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		InfoTclVersionCmd(ClientData dummy, Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static SortElement *	MergeLists(SortElement *leftPtr, SortElement *rightPtr,
			    SortInfo *infoPtr);
static int		SortCompare(SortElement *firstPtr, SortElement *second,
			    SortInfo *infoPtr);
static Tcl_Obj *	SelectObjFromSublist(Tcl_Obj *firstPtr,
			    SortInfo *infoPtr);

/*
 * Array of values describing how to implement each standard subcommand of the
 * "info" command.
 */

static const EnsembleImplMap defaultInfoMap[] = {
    {"args",		   InfoArgsCmd,		    TclCompileBasic1ArgCmd, NULL, NULL, 0},
    {"body",		   InfoBodyCmd,		    TclCompileBasic1ArgCmd, NULL, NULL, 0},
    {"cmdcount",	   InfoCmdCountCmd,	    TclCompileBasic0ArgCmd, NULL, NULL, 0},
    {"commands",	   InfoCommandsCmd,	    TclCompileInfoCommandsCmd, NULL, NULL, 0},
    {"complete",	   InfoCompleteCmd,	    TclCompileBasic1ArgCmd, NULL, NULL, 0},
    {"coroutine",	   TclInfoCoroutineCmd,     TclCompileInfoCoroutineCmd, NULL, NULL, 0},
    {"default",		   InfoDefaultCmd,	    TclCompileBasic3ArgCmd, NULL, NULL, 0},
    {"errorstack",	   InfoErrorStackCmd,	    TclCompileBasic0Or1ArgCmd, NULL, NULL, 0},
    {"exists",		   TclInfoExistsCmd,	    TclCompileInfoExistsCmd, NULL, NULL, 0},
    {"frame",		   InfoFrameCmd,	    TclCompileBasic0Or1ArgCmd, NULL, NULL, 0},
    {"functions",	   InfoFunctionsCmd,	    TclCompileBasic0Or1ArgCmd, NULL, NULL, 0},
    {"globals",		   TclInfoGlobalsCmd,	    TclCompileBasic0Or1ArgCmd, NULL, NULL, 0},
    {"hostname",	   InfoHostnameCmd,	    TclCompileBasic0ArgCmd, NULL, NULL, 0},
    {"level",		   InfoLevelCmd,	    TclCompileInfoLevelCmd, NULL, NULL, 0},
    {"library",		   InfoLibraryCmd,	    TclCompileBasic0ArgCmd, NULL, NULL, 0},
    {"loaded",		   InfoLoadedCmd,	    TclCompileBasic0Or1ArgCmd, NULL, NULL, 0},
    {"locals",		   TclInfoLocalsCmd,	    TclCompileBasic0Or1ArgCmd, NULL, NULL, 0},
    {"nameofexecutable",   InfoNameOfExecutableCmd, TclCompileBasic0ArgCmd, NULL, NULL, 0},
    {"patchlevel",	   InfoPatchLevelCmd,	    TclCompileBasic0ArgCmd, NULL, NULL, 0},
    {"procs",		   InfoProcsCmd,	    TclCompileBasic0Or1ArgCmd, NULL, NULL, 0},
    {"script",		   InfoScriptCmd,	    TclCompileBasic0Or1ArgCmd, NULL, NULL, 0},
    {"sharedlibextension", InfoSharedlibCmd,	    TclCompileBasic0ArgCmd, NULL, NULL, 0},
    {"tclversion",	   InfoTclVersionCmd,	    TclCompileBasic0ArgCmd, NULL, NULL, 0},
    {"vars",		   TclInfoVarsCmd,	    TclCompileBasic0Or1ArgCmd, NULL, NULL, 0},
    {NULL, NULL, NULL, NULL, NULL, 0}
};

/*
 *----------------------------------------------------------------------
 *
 * Tcl_IfObjCmd --
 *
 *	This procedure is invoked to process the "if" Tcl command. See the
 *	user documentation for details on what it does.
 *
 *	With the bytecode compiler, this procedure is only called when a
 *	command name is computed at runtime, and is "if" or the name to which
 *	"if" was renamed: e.g., "set z if; $z 1 {puts foo}"
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_IfObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    return Tcl_NRCallObjProc(interp, TclNRIfObjCmd, dummy, objc, objv);
}

int
TclNRIfObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Tcl_Obj *boolObj;

    if (objc <= 1) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"wrong # args: no expression after \"%s\" argument",
		TclGetString(objv[0])));
	Tcl_SetErrorCode(interp, "TCL", "WRONGARGS", NULL);
	return TCL_ERROR;
    }

    /*
     * At this point, objv[1] refers to the main expression to test. The
     * arguments after the expression must be "then" (optional) and a script
     * to execute if the expression is true.
     */

    TclNewObj(boolObj);
    Tcl_NRAddCallback(interp, IfConditionCallback, INT2PTR(objc),
	    (ClientData) objv, INT2PTR(1), boolObj);
    return Tcl_NRExprObj(interp, objv[1], boolObj);
}

static int
IfConditionCallback(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    Interp *iPtr = (Interp *) interp;
    int objc = PTR2INT(data[0]);
    Tcl_Obj *const *objv = data[1];
    int i = PTR2INT(data[2]);
    Tcl_Obj *boolObj = data[3];
    int value, thenScriptIndex = 0;
    const char *clause;

    if (result != TCL_OK) {
	TclDecrRefCount(boolObj);
	return result;
    }
    if (Tcl_GetBooleanFromObj(interp, boolObj, &value) != TCL_OK) {
	TclDecrRefCount(boolObj);
	return TCL_ERROR;
    }
    TclDecrRefCount(boolObj);

    while (1) {
	i++;
	if (i >= objc) {
	    goto missingScript;
	}
	clause = TclGetString(objv[i]);
	if ((i < objc) && (strcmp(clause, "then") == 0)) {
	    i++;
	}
	if (i >= objc) {
	    goto missingScript;
	}
	if (value) {
	    thenScriptIndex = i;
	    value = 0;
	}

	/*
	 * The expression evaluated to false. Skip the command, then see if
	 * there is an "else" or "elseif" clause.
	 */

	i++;
	if (i >= objc) {
	    if (thenScriptIndex) {
		/*
		 * TIP #280. Make invoking context available to branch.
		 */

		return TclNREvalObjEx(interp, objv[thenScriptIndex], 0,
			iPtr->cmdFramePtr, thenScriptIndex);
	    }
	    return TCL_OK;
	}
	clause = TclGetString(objv[i]);
	if ((clause[0] != 'e') || (strcmp(clause, "elseif") != 0)) {
	    break;
	}
	i++;

	/*
	 * At this point in the loop, objv and objc refer to an expression to
	 * test, either for the main expression or an expression following an
	 * "elseif". The arguments after the expression must be "then"
	 * (optional) and a script to execute if the expression is true.
	 */

	if (i >= objc) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "wrong # args: no expression after \"%s\" argument",
		    clause));
	    Tcl_SetErrorCode(interp, "TCL", "WRONGARGS", NULL);
	    return TCL_ERROR;
	}
	if (!thenScriptIndex) {
	    TclNewObj(boolObj);
	    Tcl_NRAddCallback(interp, IfConditionCallback, data[0], data[1],
		    INT2PTR(i), boolObj);
	    return Tcl_NRExprObj(interp, objv[i], boolObj);
	}
    }

    /*
     * Couldn't find a "then" or "elseif" clause to execute. Check now for an
     * "else" clause. We know that there's at least one more argument when we
     * get here.
     */

    if (strcmp(clause, "else") == 0) {
	i++;
	if (i >= objc) {
	    goto missingScript;
	}
    }
    if (i < objc - 1) {
	Tcl_SetObjResult(interp, Tcl_NewStringObj(
		"wrong # args: extra words after \"else\" clause in \"if\" command",
		-1));
	Tcl_SetErrorCode(interp, "TCL", "WRONGARGS", NULL);
	return TCL_ERROR;
    }
    if (thenScriptIndex) {
	/*
	 * TIP #280. Make invoking context available to branch/else.
	 */

	return TclNREvalObjEx(interp, objv[thenScriptIndex], 0,
		iPtr->cmdFramePtr, thenScriptIndex);
    }
    return TclNREvalObjEx(interp, objv[i], 0, iPtr->cmdFramePtr, i);

  missingScript:
    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
	    "wrong # args: no script following \"%s\" argument",
	    TclGetString(objv[i-1])));
    Tcl_SetErrorCode(interp, "TCL", "WRONGARGS", NULL);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_IncrObjCmd --
 *
 *	This procedure is invoked to process the "incr" Tcl command. See the
 *	user documentation for details on what it does.
 *
 *	With the bytecode compiler, this procedure is only called when a
 *	command name is computed at runtime, and is "incr" or the name to
 *	which "incr" was renamed: e.g., "set z incr; $z i -1"
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_IncrObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Tcl_Obj *newValuePtr, *incrPtr;

    if ((objc != 2) && (objc != 3)) {
	Tcl_WrongNumArgs(interp, 1, objv, "varName ?increment?");
	return TCL_ERROR;
    }

    if (objc == 3) {
	incrPtr = objv[2];
    } else {
	incrPtr = Tcl_NewIntObj(1);
    }
    Tcl_IncrRefCount(incrPtr);
    newValuePtr = TclIncrObjVar2(interp, objv[1], NULL,
	    incrPtr, TCL_LEAVE_ERR_MSG);
    Tcl_DecrRefCount(incrPtr);

    if (newValuePtr == NULL) {
	return TCL_ERROR;
    }

    /*
     * Set the interpreter's object result to refer to the variable's new
     * value object.
     */

    Tcl_SetObjResult(interp, newValuePtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclInitInfoCmd --
 *
 *	This function is called to create the "info" Tcl command. See the user
 *	documentation for details on what it does.
 *
 * Results:
 *	Handle for the info command, or NULL on failure.
 *
 * Side effects:
 *	none
 *
 *----------------------------------------------------------------------
 */

Tcl_Command
TclInitInfoCmd(
    Tcl_Interp *interp)		/* Current interpreter. */
{
    return TclMakeEnsemble(interp, "info", defaultInfoMap);
}

/*
 *----------------------------------------------------------------------
 *
 * InfoArgsCmd --
 *
 *	Called to implement the "info args" command that returns the argument
 *	list for a procedure. Handles the following syntax:
 *
 *	    info args procName
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoArgsCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    register Interp *iPtr = (Interp *) interp;
    const char *name;
    Proc *procPtr;
    CompiledLocal *localPtr;
    Tcl_Obj *listObjPtr;

    if (objc != 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "procname");
	return TCL_ERROR;
    }

    name = TclGetString(objv[1]);
    procPtr = TclFindProc(iPtr, name);
    if (procPtr == NULL) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"\"%s\" isn't a procedure", name));
	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "PROCEDURE", name, NULL);
	return TCL_ERROR;
    }

    /*
     * Build a return list containing the arguments.
     */

    listObjPtr = Tcl_NewListObj(0, NULL);
    for (localPtr = procPtr->firstLocalPtr;  localPtr != NULL;
	    localPtr = localPtr->nextPtr) {
	if (TclIsVarArgument(localPtr)) {
	    Tcl_ListObjAppendElement(interp, listObjPtr,
		    Tcl_NewStringObj(localPtr->name, -1));
	}
    }
    Tcl_SetObjResult(interp, listObjPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoBodyCmd --
 *
 *	Called to implement the "info body" command that returns the body for
 *	a procedure. Handles the following syntax:
 *
 *	    info body procName
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoBodyCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    register Interp *iPtr = (Interp *) interp;
    const char *name;
    Proc *procPtr;
    Tcl_Obj *bodyPtr, *resultPtr;

    if (objc != 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "procname");
	return TCL_ERROR;
    }

    name = TclGetString(objv[1]);
    procPtr = TclFindProc(iPtr, name);
    if (procPtr == NULL) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"\"%s\" isn't a procedure", name));
	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "PROCEDURE", name, NULL);
	return TCL_ERROR;
    }

    /*
     * Here we used to return procPtr->bodyPtr, except when the body was
     * bytecompiled - in that case, the return was a copy of the body's string
     * rep. In order to better isolate the implementation details of the
     * compiler/engine subsystem, we now always return a copy of the string
     * rep. It is important to return a copy so that later manipulations of
     * the object do not invalidate the internal rep.
     */

    bodyPtr = procPtr->bodyPtr;
    if (bodyPtr->bytes == NULL) {
	/*
	 * The string rep might not be valid if the procedure has never been
	 * run before. [Bug #545644]
	 */

	TclGetString(bodyPtr);
    }
    resultPtr = Tcl_NewStringObj(bodyPtr->bytes, bodyPtr->length);

    Tcl_SetObjResult(interp, resultPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoCmdCountCmd --
 *
 *	Called to implement the "info cmdcount" command that returns the
 *	number of commands that have been executed. Handles the following
 *	syntax:
 *
 *	    info cmdcount
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoCmdCountCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Interp *iPtr = (Interp *) interp;

    if (objc != 1) {
	Tcl_WrongNumArgs(interp, 1, objv, NULL);
	return TCL_ERROR;
    }

    Tcl_SetObjResult(interp, Tcl_NewIntObj(iPtr->cmdCount));
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoCommandsCmd --
 *
 *	Called to implement the "info commands" command that returns the list
 *	of commands in the interpreter that match an optional pattern. The
 *	pattern, if any, consists of an optional sequence of namespace names
 *	separated by "::" qualifiers, which is followed by a glob-style
 *	pattern that restricts which commands are returned. Handles the
 *	following syntax:
 *
 *	    info commands ?pattern?
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoCommandsCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    const char *cmdName, *pattern;
    const char *simplePattern;
    register Tcl_HashEntry *entryPtr;
    Tcl_HashSearch search;
    Namespace *nsPtr;
    Namespace *globalNsPtr = (Namespace *) Tcl_GetGlobalNamespace(interp);
    Namespace *currNsPtr = (Namespace *) Tcl_GetCurrentNamespace(interp);
    Tcl_Obj *listPtr, *elemObjPtr;
    int specificNsInPattern = 0;/* Init. to avoid compiler warning. */
    Tcl_Command cmd;
    int i;

    /*
     * Get the pattern and find the "effective namespace" in which to list
     * commands.
     */

    if (objc == 1) {
	simplePattern = NULL;
	nsPtr = currNsPtr;
	specificNsInPattern = 0;
    } else if (objc == 2) {
	/*
	 * From the pattern, get the effective namespace and the simple
	 * pattern (no namespace qualifiers or ::'s) at the end. If an error
	 * was found while parsing the pattern, return it. Otherwise, if the
	 * namespace wasn't found, just leave nsPtr NULL: we will return an
	 * empty list since no commands there can be found.
	 */

	Namespace *dummy1NsPtr, *dummy2NsPtr;

	pattern = TclGetString(objv[1]);
	TclGetNamespaceForQualName(interp, pattern, NULL, 0, &nsPtr,
		&dummy1NsPtr, &dummy2NsPtr, &simplePattern);

	if (nsPtr != NULL) {	/* We successfully found the pattern's ns. */
	    specificNsInPattern = (strcmp(simplePattern, pattern) != 0);
	}
    } else {
	Tcl_WrongNumArgs(interp, 1, objv, "?pattern?");
	return TCL_ERROR;
    }

    /*
     * Exit as quickly as possible if we couldn't find the namespace.
     */

    if (nsPtr == NULL) {
	return TCL_OK;
    }

    /*
     * Scan through the effective namespace's command table and create a list
     * with all commands that match the pattern. If a specific namespace was
     * requested in the pattern, qualify the command names with the namespace
     * name.
     */

    listPtr = Tcl_NewListObj(0, NULL);

    if (simplePattern != NULL && TclMatchIsTrivial(simplePattern)) {
	/*
	 * Special case for when the pattern doesn't include any of glob's
	 * special characters. This lets us avoid scans of any hash tables.
	 */

	entryPtr = Tcl_FindHashEntry(&nsPtr->cmdTable, simplePattern);
	if (entryPtr != NULL) {
	    if (specificNsInPattern) {
		cmd = Tcl_GetHashValue(entryPtr);
		elemObjPtr = Tcl_NewObj();
		Tcl_GetCommandFullName(interp, cmd, elemObjPtr);
	    } else {
		cmdName = Tcl_GetHashKey(&nsPtr->cmdTable, entryPtr);
		elemObjPtr = Tcl_NewStringObj(cmdName, -1);
	    }
	    Tcl_ListObjAppendElement(interp, listPtr, elemObjPtr);
	    Tcl_SetObjResult(interp, listPtr);
	    return TCL_OK;
	}
	if ((nsPtr != globalNsPtr) && !specificNsInPattern) {
	    Tcl_HashTable *tablePtr = NULL;	/* Quell warning. */

	    for (i=0 ; i<nsPtr->commandPathLength ; i++) {
		Namespace *pathNsPtr = nsPtr->commandPathArray[i].nsPtr;

		if (pathNsPtr == NULL) {
		    continue;
		}
		tablePtr = &pathNsPtr->cmdTable;
		entryPtr = Tcl_FindHashEntry(tablePtr, simplePattern);
		if (entryPtr != NULL) {
		    break;
		}
	    }
	    if (entryPtr == NULL) {
		tablePtr = &globalNsPtr->cmdTable;
		entryPtr = Tcl_FindHashEntry(tablePtr, simplePattern);
	    }
	    if (entryPtr != NULL) {
		cmdName = Tcl_GetHashKey(tablePtr, entryPtr);
		Tcl_ListObjAppendElement(interp, listPtr,
			Tcl_NewStringObj(cmdName, -1));
		Tcl_SetObjResult(interp, listPtr);
		return TCL_OK;
	    }
	}
    } else if (nsPtr->commandPathLength == 0 || specificNsInPattern) {
	/*
	 * The pattern is non-trivial, but either there is no explicit path or
	 * there is an explicit namespace in the pattern. In both cases, the
	 * old matching scheme is perfect.
	 */

	entryPtr = Tcl_FirstHashEntry(&nsPtr->cmdTable, &search);
	while (entryPtr != NULL) {
	    cmdName = Tcl_GetHashKey(&nsPtr->cmdTable, entryPtr);
	    if ((simplePattern == NULL)
		    || Tcl_StringMatch(cmdName, simplePattern)) {
		if (specificNsInPattern) {
		    cmd = Tcl_GetHashValue(entryPtr);
		    elemObjPtr = Tcl_NewObj();
		    Tcl_GetCommandFullName(interp, cmd, elemObjPtr);
		} else {
		    elemObjPtr = Tcl_NewStringObj(cmdName, -1);
		}
		Tcl_ListObjAppendElement(interp, listPtr, elemObjPtr);
	    }
	    entryPtr = Tcl_NextHashEntry(&search);
	}

	/*
	 * If the effective namespace isn't the global :: namespace, and a
	 * specific namespace wasn't requested in the pattern, then add in all
	 * global :: commands that match the simple pattern. Of course, we add
	 * in only those commands that aren't hidden by a command in the
	 * effective namespace.
	 */

	if ((nsPtr != globalNsPtr) && !specificNsInPattern) {
	    entryPtr = Tcl_FirstHashEntry(&globalNsPtr->cmdTable, &search);
	    while (entryPtr != NULL) {
		cmdName = Tcl_GetHashKey(&globalNsPtr->cmdTable, entryPtr);
		if ((simplePattern == NULL)
			|| Tcl_StringMatch(cmdName, simplePattern)) {
		    if (Tcl_FindHashEntry(&nsPtr->cmdTable,cmdName) == NULL) {
			Tcl_ListObjAppendElement(interp, listPtr,
				Tcl_NewStringObj(cmdName, -1));
		    }
		}
		entryPtr = Tcl_NextHashEntry(&search);
	    }
	}
    } else {
	/*
	 * The pattern is non-trivial (can match more than one command name),
	 * there is an explicit path, and there is no explicit namespace in
	 * the pattern. This means that we have to traverse the path to
	 * discover all the commands defined.
	 */

	Tcl_HashTable addedCommandsTable;
	int isNew;
	int foundGlobal = (nsPtr == globalNsPtr);

	/*
	 * We keep a hash of the objects already added to the result list.
	 */

	Tcl_InitObjHashTable(&addedCommandsTable);

	entryPtr = Tcl_FirstHashEntry(&nsPtr->cmdTable, &search);
	while (entryPtr != NULL) {
	    cmdName = Tcl_GetHashKey(&nsPtr->cmdTable, entryPtr);
	    if ((simplePattern == NULL)
		    || Tcl_StringMatch(cmdName, simplePattern)) {
		elemObjPtr = Tcl_NewStringObj(cmdName, -1);
		Tcl_ListObjAppendElement(interp, listPtr, elemObjPtr);
		(void) Tcl_CreateHashEntry(&addedCommandsTable,
			elemObjPtr, &isNew);
	    }
	    entryPtr = Tcl_NextHashEntry(&search);
	}

	/*
	 * Search the path next.
	 */

	for (i=0 ; i<nsPtr->commandPathLength ; i++) {
	    Namespace *pathNsPtr = nsPtr->commandPathArray[i].nsPtr;

	    if (pathNsPtr == NULL) {
		continue;
	    }
	    if (pathNsPtr == globalNsPtr) {
		foundGlobal = 1;
	    }
	    entryPtr = Tcl_FirstHashEntry(&pathNsPtr->cmdTable, &search);
	    while (entryPtr != NULL) {
		cmdName = Tcl_GetHashKey(&pathNsPtr->cmdTable, entryPtr);
		if ((simplePattern == NULL)
			|| Tcl_StringMatch(cmdName, simplePattern)) {
		    elemObjPtr = Tcl_NewStringObj(cmdName, -1);
		    (void) Tcl_CreateHashEntry(&addedCommandsTable,
			    elemObjPtr, &isNew);
		    if (isNew) {
			Tcl_ListObjAppendElement(interp, listPtr, elemObjPtr);
		    } else {
			TclDecrRefCount(elemObjPtr);
		    }
		}
		entryPtr = Tcl_NextHashEntry(&search);
	    }
	}

	/*
	 * If the effective namespace isn't the global :: namespace, and a
	 * specific namespace wasn't requested in the pattern, then add in all
	 * global :: commands that match the simple pattern. Of course, we add
	 * in only those commands that aren't hidden by a command in the
	 * effective namespace.
	 */

	if (!foundGlobal) {
	    entryPtr = Tcl_FirstHashEntry(&globalNsPtr->cmdTable, &search);
	    while (entryPtr != NULL) {
		cmdName = Tcl_GetHashKey(&globalNsPtr->cmdTable, entryPtr);
		if ((simplePattern == NULL)
			|| Tcl_StringMatch(cmdName, simplePattern)) {
		    elemObjPtr = Tcl_NewStringObj(cmdName, -1);
		    if (Tcl_FindHashEntry(&addedCommandsTable,
			    (char *) elemObjPtr) == NULL) {
			Tcl_ListObjAppendElement(interp, listPtr, elemObjPtr);
		    } else {
			TclDecrRefCount(elemObjPtr);
		    }
		}
		entryPtr = Tcl_NextHashEntry(&search);
	    }
	}

	Tcl_DeleteHashTable(&addedCommandsTable);
    }

    Tcl_SetObjResult(interp, listPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoCompleteCmd --
 *
 *	Called to implement the "info complete" command that determines
 *	whether a string is a complete Tcl command. Handles the following
 *	syntax:
 *
 *	    info complete command
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoCompleteCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    if (objc != 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "command");
	return TCL_ERROR;
    }

    Tcl_SetObjResult(interp, Tcl_NewBooleanObj(
	    TclObjCommandComplete(objv[1])));
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoDefaultCmd --
 *
 *	Called to implement the "info default" command that returns the
 *	default value for a procedure argument. Handles the following syntax:
 *
 *	    info default procName arg varName
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoDefaultCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Interp *iPtr = (Interp *) interp;
    const char *procName, *argName;
    Proc *procPtr;
    CompiledLocal *localPtr;
    Tcl_Obj *valueObjPtr;

    if (objc != 4) {
	Tcl_WrongNumArgs(interp, 1, objv, "procname arg varname");
	return TCL_ERROR;
    }

    procName = TclGetString(objv[1]);
    argName = TclGetString(objv[2]);

    procPtr = TclFindProc(iPtr, procName);
    if (procPtr == NULL) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"\"%s\" isn't a procedure", procName));
	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "PROCEDURE", procName,
		NULL);
	return TCL_ERROR;
    }

    for (localPtr = procPtr->firstLocalPtr;  localPtr != NULL;
	    localPtr = localPtr->nextPtr) {
	if (TclIsVarArgument(localPtr)
		&& (strcmp(argName, localPtr->name) == 0)) {
	    if (localPtr->defValuePtr != NULL) {
		valueObjPtr = Tcl_ObjSetVar2(interp, objv[3], NULL,
			localPtr->defValuePtr, TCL_LEAVE_ERR_MSG);
		if (valueObjPtr == NULL) {
		    return TCL_ERROR;
		}
		Tcl_SetObjResult(interp, Tcl_NewIntObj(1));
	    } else {
		Tcl_Obj *nullObjPtr = Tcl_NewObj();

		valueObjPtr = Tcl_ObjSetVar2(interp, objv[3], NULL,
			nullObjPtr, TCL_LEAVE_ERR_MSG);
		if (valueObjPtr == NULL) {
		    return TCL_ERROR;
		}
		Tcl_SetObjResult(interp, Tcl_NewIntObj(0));
	    }
	    return TCL_OK;
	}
    }

    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
	    "procedure \"%s\" doesn't have an argument \"%s\"",
	    procName, argName));
    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ARGUMENT", argName, NULL);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoErrorStackCmd --
 *
 *	Called to implement the "info errorstack" command that returns information
 *	about the last error's call stack. Handles the following syntax:
 *
 *	    info errorstack ?interp?
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoErrorStackCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Tcl_Interp *target;
    Interp *iPtr;

    if ((objc != 1) && (objc != 2)) {
	Tcl_WrongNumArgs(interp, 1, objv, "?interp?");
	return TCL_ERROR;
    }

    target = interp;
    if (objc == 2) {
	target = Tcl_GetSlave(interp, Tcl_GetString(objv[1]));
	if (target == NULL) {
	    return TCL_ERROR;
	}
    }

    iPtr = (Interp *) target;
    Tcl_SetObjResult(interp, iPtr->errorStack);

    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclInfoExistsCmd --
 *
 *	Called to implement the "info exists" command that determines whether
 *	a variable exists. Handles the following syntax:
 *
 *	    info exists varName
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

int
TclInfoExistsCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    const char *varName;
    Var *varPtr;

    if (objc != 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "varName");
	return TCL_ERROR;
    }

    varName = TclGetString(objv[1]);
    varPtr = TclVarTraceExists(interp, varName);

    Tcl_SetObjResult(interp,
	    Tcl_NewBooleanObj(varPtr && varPtr->value.objPtr));
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoFrameCmd --
 *	TIP #280
 *
 *	Called to implement the "info frame" command that returns the location
 *	of either the currently executing command, or its caller. Handles the
 *	following syntax:
 *
 *		info frame ?number?
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoFrameCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Interp *iPtr = (Interp *) interp;
    int level, code = TCL_OK;
    CmdFrame *framePtr, **cmdFramePtrPtr = &iPtr->cmdFramePtr;
    CoroutineData *corPtr = iPtr->execEnvPtr->corPtr;
    int topLevel = 0;

    if (objc > 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "?number?");
	return TCL_ERROR;
    }

    while (corPtr) {
	while (*cmdFramePtrPtr) {
	    topLevel++;
	    cmdFramePtrPtr = &((*cmdFramePtrPtr)->nextPtr);
	}
	if (corPtr->caller.cmdFramePtr) {
	    *cmdFramePtrPtr = corPtr->caller.cmdFramePtr;
	}
	corPtr = corPtr->callerEEPtr->corPtr;
    }
    topLevel += (*cmdFramePtrPtr)->level;

    if (topLevel != iPtr->cmdFramePtr->level) {
	framePtr = iPtr->cmdFramePtr;
	while (framePtr) {
	    framePtr->level = topLevel--;
	    framePtr = framePtr->nextPtr;
	}
	if (topLevel) {
	    Tcl_Panic("Broken frame level calculation");
	}
	topLevel = iPtr->cmdFramePtr->level;
    }

    if (objc == 1) {
	/*
	 * Just "info frame".
	 */

	Tcl_SetObjResult(interp, Tcl_NewIntObj(topLevel));
	goto done;
    }

    /*
     * We've got "info frame level" and must parse the level first.
     */

    if (TclGetIntFromObj(interp, objv[1], &level) != TCL_OK) {
	code = TCL_ERROR;
	goto done;
    }

    if ((level > topLevel) || (level <= - topLevel)) {
    levelError:
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"bad level \"%s\"", TclGetString(objv[1])));
	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LEVEL",
		TclGetString(objv[1]), NULL);
	code = TCL_ERROR;
	goto done;
    }

    /*
     * Let us convert to relative so that we know how many levels to go back
     */

    if (level > 0) {
	level -= topLevel;
    }

    framePtr = iPtr->cmdFramePtr;
    while (++level <= 0) {
	framePtr = framePtr->nextPtr;
	if (!framePtr) {
	    goto levelError;
	}
    }

    Tcl_SetObjResult(interp, TclInfoFrame(interp, framePtr));

  done:
    cmdFramePtrPtr = &iPtr->cmdFramePtr;
    corPtr = iPtr->execEnvPtr->corPtr;
    while (corPtr) {
	CmdFrame *endPtr = corPtr->caller.cmdFramePtr;

	if (endPtr) {
	    if (*cmdFramePtrPtr == endPtr) {
		*cmdFramePtrPtr = NULL;
	    } else {
		CmdFrame *runPtr = *cmdFramePtrPtr;

		while (runPtr->nextPtr != endPtr) {
		    runPtr->level -= endPtr->level;
		    runPtr = runPtr->nextPtr;
		}
		runPtr->level = 1;
		runPtr->nextPtr = NULL;
	    }
	    cmdFramePtrPtr = &corPtr->caller.cmdFramePtr;
	}
	corPtr = corPtr->callerEEPtr->corPtr;
    }
    return code;
}

/*
 *----------------------------------------------------------------------
 *
 * TclInfoFrame --
 *
 *	Core of InfoFrameCmd, returns TIP280 dict for a given frame.
 *
 * Results:
 *	Returns TIP280 dict.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

Tcl_Obj *
TclInfoFrame(
    Tcl_Interp *interp,		/* Current interpreter. */
    CmdFrame *framePtr)		/* Frame to get info for. */
{
    Interp *iPtr = (Interp *) interp;
    Tcl_Obj *tmpObj;
    Tcl_Obj *lv[20];		/* Keep uptodate when more keys are added to
				 * the dict. */
    int lc = 0;
    /*
     * This array is indexed by the TCL_LOCATION_... values, except
     * for _LAST.
     */
    static const char *const typeString[TCL_LOCATION_LAST] = {
	"eval", "eval", "eval", "precompiled", "source", "proc"
    };
    Proc *procPtr = framePtr->framePtr ? framePtr->framePtr->procPtr : NULL;
    int needsFree = -1;

    /*
     * Pull the information and construct the dictionary to return, as list.
     * Regarding use of the CmdFrame fields see tclInt.h, and its definition.
     */

#define ADD_PAIR(name, value) \
	TclNewLiteralStringObj(tmpObj, name); \
	lv[lc++] = tmpObj; \
	lv[lc++] = (value)

    switch (framePtr->type) {
    case TCL_LOCATION_EVAL:
	/*
	 * Evaluation, dynamic script. Type, line, cmd, the latter through
	 * str.
	 */

	ADD_PAIR("type", Tcl_NewStringObj(typeString[framePtr->type], -1));
	if (framePtr->line) {
	    ADD_PAIR("line", Tcl_NewIntObj(framePtr->line[0]));
	} else {
	    ADD_PAIR("line", Tcl_NewIntObj(1));
	}
	ADD_PAIR("cmd", TclGetSourceFromFrame(framePtr, 0, NULL));
	break;

    case TCL_LOCATION_PREBC:
	/*
	 * Precompiled. Result contains the type as signal, nothing else.
	 */

	ADD_PAIR("type", Tcl_NewStringObj(typeString[framePtr->type], -1));
	break;

    case TCL_LOCATION_BC: {
	/*
	 * Execution of bytecode. Talk to the BC engine to fill out the frame.
	 */

	CmdFrame *fPtr = TclStackAlloc(interp, sizeof(CmdFrame));

	*fPtr = *framePtr;

	/*
	 * Note:
	 * Type BC => f.data.eval.path	  is not used.
	 *	      f.data.tebc.codePtr is used instead.
	 */

	TclGetSrcInfoForPc(fPtr);

	/*
	 * Now filled: cmd.str.(cmd,len), line
	 * Possibly modified: type, path!
	 */

	ADD_PAIR("type", Tcl_NewStringObj(typeString[fPtr->type], -1));
	if (fPtr->line) {
	    ADD_PAIR("line", Tcl_NewIntObj(fPtr->line[0]));
	}

	if (fPtr->type == TCL_LOCATION_SOURCE) {
	    ADD_PAIR("file", fPtr->data.eval.path);

	    /*
	     * Death of reference by TclGetSrcInfoForPc.
	     */

	    Tcl_DecrRefCount(fPtr->data.eval.path);
	}

	ADD_PAIR("cmd", TclGetSourceFromFrame(fPtr, 0, NULL));
	if (fPtr->cmdObj && framePtr->cmdObj == NULL) {
	    needsFree = lc - 1;
	}
	TclStackFree(interp, fPtr);
	break;
    }

    case TCL_LOCATION_SOURCE:
	/*
	 * Evaluation of a script file.
	 */

	ADD_PAIR("type", Tcl_NewStringObj(typeString[framePtr->type], -1));
	ADD_PAIR("line", Tcl_NewIntObj(framePtr->line[0]));
	ADD_PAIR("file", framePtr->data.eval.path);

	/*
	 * Refcount framePtr->data.eval.path goes up when lv is converted into
	 * the result list object.
	 */

	ADD_PAIR("cmd", TclGetSourceFromFrame(framePtr, 0, NULL));
	break;

    case TCL_LOCATION_PROC:
	Tcl_Panic("TCL_LOCATION_PROC found in standard frame");
	break;
    }

    /*
     * 'proc'. Common to all frame types. Conditional on having an associated
     * Procedure CallFrame.
     */

    if (procPtr != NULL) {
	Tcl_HashEntry *namePtr = procPtr->cmdPtr->hPtr;

	if (namePtr) {
	    Tcl_Obj *procNameObj;

	    /*
	     * This is a regular command.
	     */

	    TclNewObj(procNameObj);
	    Tcl_GetCommandFullName(interp, (Tcl_Command) procPtr->cmdPtr,
		    procNameObj);
	    ADD_PAIR("proc", procNameObj);
	} else if (procPtr->cmdPtr->clientData) {
	    ExtraFrameInfo *efiPtr = procPtr->cmdPtr->clientData;
	    int i;

	    /*
	     * This is a non-standard command. Luckily, it's told us how to
	     * render extra information about its frame.
	     */

	    for (i=0 ; i<efiPtr->length ; i++) {
		lv[lc++] = Tcl_NewStringObj(efiPtr->fields[i].name, -1);
		if (efiPtr->fields[i].proc) {
		    lv[lc++] =
			efiPtr->fields[i].proc(efiPtr->fields[i].clientData);
		} else {
		    lv[lc++] = efiPtr->fields[i].clientData;
		}
	    }
	}
    }

    /*
     * 'level'. Common to all frame types. Conditional on having an associated
     * _visible_ CallFrame.
     */

    if ((framePtr->framePtr != NULL) && (iPtr->varFramePtr != NULL)) {
	CallFrame *current = framePtr->framePtr;
	CallFrame *top = iPtr->varFramePtr;
	CallFrame *idx;

	for (idx=top ; idx!=NULL ; idx=idx->callerVarPtr) {
	    if (idx == current) {
		int c = framePtr->framePtr->level;
		int t = iPtr->varFramePtr->level;

		ADD_PAIR("level", Tcl_NewIntObj(t - c));
		break;
	    }
	}
    }

    tmpObj = Tcl_NewListObj(lc, lv);
    if (needsFree >= 0) {
	Tcl_DecrRefCount(lv[needsFree]);
    }
    return tmpObj;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoFunctionsCmd --
 *
 *	Called to implement the "info functions" command that returns the list
 *	of math functions matching an optional pattern. Handles the following
 *	syntax:
 *
 *	    info functions ?pattern?
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoFunctionsCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Tcl_Obj *script;
    int code;

    if (objc > 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "?pattern?");
	return TCL_ERROR;
    }

    script = Tcl_NewStringObj(
"	    ::apply [::list {{pattern *}} {\n"
"		::set cmds {}\n"
"		::foreach cmd [::info commands ::tcl::mathfunc::$pattern] {\n"
"		    ::lappend cmds [::namespace tail $cmd]\n"
"		}\n"
"		::foreach cmd [::info commands tcl::mathfunc::$pattern] {\n"
"		    ::set cmd [::namespace tail $cmd]\n"
"		    ::if {$cmd ni $cmds} {\n"
"			::lappend cmds $cmd\n"
"		    }\n"
"		}\n"
"		::return $cmds\n"
"	    } [::namespace current]] ", -1);

    if (objc == 2) {
	Tcl_Obj *arg = Tcl_NewListObj(1, &(objv[1]));

	Tcl_AppendObjToObj(script, arg);
	Tcl_DecrRefCount(arg);
    }

    Tcl_IncrRefCount(script);
    code = Tcl_EvalObjEx(interp, script, 0);

    Tcl_DecrRefCount(script);

    return code;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoHostnameCmd --
 *
 *	Called to implement the "info hostname" command that returns the host
 *	name. Handles the following syntax:
 *
 *	    info hostname
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoHostnameCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    const char *name;

    if (objc != 1) {
	Tcl_WrongNumArgs(interp, 1, objv, NULL);
	return TCL_ERROR;
    }

    name = Tcl_GetHostName();
    if (name) {
	Tcl_SetObjResult(interp, Tcl_NewStringObj(name, -1));
	return TCL_OK;
    }

    Tcl_SetObjResult(interp, Tcl_NewStringObj(
	    "unable to determine name of host", -1));
    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "HOSTNAME", "UNKNOWN", NULL);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoLevelCmd --
 *
 *	Called to implement the "info level" command that returns information
 *	about the call stack. Handles the following syntax:
 *
 *	    info level ?number?
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoLevelCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Interp *iPtr = (Interp *) interp;

    if (objc == 1) {		/* Just "info level" */
	Tcl_SetObjResult(interp, Tcl_NewIntObj(iPtr->varFramePtr->level));
	return TCL_OK;
    }

    if (objc == 2) {
	int level;
	CallFrame *framePtr, *rootFramePtr = iPtr->rootFramePtr;

	if (TclGetIntFromObj(interp, objv[1], &level) != TCL_OK) {
	    return TCL_ERROR;
	}
	if (level <= 0) {
	    if (iPtr->varFramePtr == rootFramePtr) {
		goto levelError;
	    }
	    level += iPtr->varFramePtr->level;
	}
	for (framePtr=iPtr->varFramePtr ; framePtr!=rootFramePtr;
		framePtr=framePtr->callerVarPtr) {
	    if (framePtr->level == level) {
		break;
	    }
	}
	if (framePtr == rootFramePtr) {
	    goto levelError;
	}

	Tcl_SetObjResult(interp,
		Tcl_NewListObj(framePtr->objc, framePtr->objv));
	return TCL_OK;
    }

    Tcl_WrongNumArgs(interp, 1, objv, "?number?");
    return TCL_ERROR;

  levelError:
    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
	    "bad level \"%s\"", TclGetString(objv[1])));
    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LEVEL",
	    TclGetString(objv[1]), NULL);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoLibraryCmd --
 *
 *	Called to implement the "info library" command that returns the
 *	library directory for the Tcl installation. Handles the following
 *	syntax:
 *
 *	    info library
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoLibraryCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    const char *libDirName;

    if (objc != 1) {
	Tcl_WrongNumArgs(interp, 1, objv, NULL);
	return TCL_ERROR;
    }

    libDirName = Tcl_GetVar2(interp, "tcl_library", NULL, TCL_GLOBAL_ONLY);
    if (libDirName != NULL) {
	Tcl_SetObjResult(interp, Tcl_NewStringObj(libDirName, -1));
	return TCL_OK;
    }

    Tcl_SetObjResult(interp, Tcl_NewStringObj(
	    "no library has been specified for Tcl", -1));
    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "VARIABLE", "tcl_library",NULL);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoLoadedCmd --
 *
 *	Called to implement the "info loaded" command that returns the
 *	packages that have been loaded into an interpreter. Handles the
 *	following syntax:
 *
 *	    info loaded ?interp?
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoLoadedCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    const char *interpName, *packageName;

    if (objc > 3) {
	Tcl_WrongNumArgs(interp, 1, objv, "?interp? ?packageName?");
	return TCL_ERROR;
    }

    if (objc < 2) {		/* Get loaded pkgs in all interpreters. */
	interpName = NULL;
    } else {			/* Get pkgs just in specified interp. */
	interpName = TclGetString(objv[1]);
    }
    if (objc < 3) {		/* Get loaded files in all packages. */
	packageName = NULL;
    } else {			/* Get pkgs just in specified interp. */
	packageName = TclGetString(objv[2]);
    }
    return TclGetLoadedPackagesEx(interp, interpName, packageName);
}

/*
 *----------------------------------------------------------------------
 *
 * InfoNameOfExecutableCmd --
 *
 *	Called to implement the "info nameofexecutable" command that returns
 *	the name of the binary file running this application. Handles the
 *	following syntax:
 *
 *	    info nameofexecutable
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoNameOfExecutableCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    if (objc != 1) {
	Tcl_WrongNumArgs(interp, 1, objv, NULL);
	return TCL_ERROR;
    }
    Tcl_SetObjResult(interp, TclGetObjNameOfExecutable());
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoPatchLevelCmd --
 *
 *	Called to implement the "info patchlevel" command that returns the
 *	default value for an argument to a procedure. Handles the following
 *	syntax:
 *
 *	    info patchlevel
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoPatchLevelCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    const char *patchlevel;

    if (objc != 1) {
	Tcl_WrongNumArgs(interp, 1, objv, NULL);
	return TCL_ERROR;
    }

    patchlevel = Tcl_GetVar2(interp, "tcl_patchLevel", NULL,
	    (TCL_GLOBAL_ONLY | TCL_LEAVE_ERR_MSG));
    if (patchlevel != NULL) {
	Tcl_SetObjResult(interp, Tcl_NewStringObj(patchlevel, -1));
	return TCL_OK;
    }
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoProcsCmd --
 *
 *	Called to implement the "info procs" command that returns the list of
 *	procedures in the interpreter that match an optional pattern. The
 *	pattern, if any, consists of an optional sequence of namespace names
 *	separated by "::" qualifiers, which is followed by a glob-style
 *	pattern that restricts which commands are returned. Handles the
 *	following syntax:
 *
 *	    info procs ?pattern?
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoProcsCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    const char *cmdName, *pattern;
    const char *simplePattern;
    Namespace *nsPtr;
#ifdef INFO_PROCS_SEARCH_GLOBAL_NS
    Namespace *globalNsPtr = (Namespace *) Tcl_GetGlobalNamespace(interp);
#endif
    Namespace *currNsPtr = (Namespace *) Tcl_GetCurrentNamespace(interp);
    Tcl_Obj *listPtr, *elemObjPtr;
    int specificNsInPattern = 0;/* Init. to avoid compiler warning. */
    register Tcl_HashEntry *entryPtr;
    Tcl_HashSearch search;
    Command *cmdPtr, *realCmdPtr;

    /*
     * Get the pattern and find the "effective namespace" in which to list
     * procs.
     */

    if (objc == 1) {
	simplePattern = NULL;
	nsPtr = currNsPtr;
	specificNsInPattern = 0;
    } else if (objc == 2) {
	/*
	 * From the pattern, get the effective namespace and the simple
	 * pattern (no namespace qualifiers or ::'s) at the end. If an error
	 * was found while parsing the pattern, return it. Otherwise, if the
	 * namespace wasn't found, just leave nsPtr NULL: we will return an
	 * empty list since no commands there can be found.
	 */

	Namespace *dummy1NsPtr, *dummy2NsPtr;

	pattern = TclGetString(objv[1]);
	TclGetNamespaceForQualName(interp, pattern, NULL, /*flags*/ 0, &nsPtr,
		&dummy1NsPtr, &dummy2NsPtr, &simplePattern);

	if (nsPtr != NULL) {	/* We successfully found the pattern's ns. */
	    specificNsInPattern = (strcmp(simplePattern, pattern) != 0);
	}
    } else {
	Tcl_WrongNumArgs(interp, 1, objv, "?pattern?");
	return TCL_ERROR;
    }

    if (nsPtr == NULL) {
	return TCL_OK;
    }

    /*
     * Scan through the effective namespace's command table and create a list
     * with all procs that match the pattern. If a specific namespace was
     * requested in the pattern, qualify the command names with the namespace
     * name.
     */

    listPtr = Tcl_NewListObj(0, NULL);
#ifndef INFO_PROCS_SEARCH_GLOBAL_NS
    if (simplePattern != NULL && TclMatchIsTrivial(simplePattern)) {
	entryPtr = Tcl_FindHashEntry(&nsPtr->cmdTable, simplePattern);
	if (entryPtr != NULL) {
	    cmdPtr = Tcl_GetHashValue(entryPtr);

	    if (!TclIsProc(cmdPtr)) {
		realCmdPtr = (Command *)
			TclGetOriginalCommand((Tcl_Command) cmdPtr);
		if (realCmdPtr != NULL && TclIsProc(realCmdPtr)) {
		    goto simpleProcOK;
		}
	    } else {
	    simpleProcOK:
		if (specificNsInPattern) {
		    elemObjPtr = Tcl_NewObj();
		    Tcl_GetCommandFullName(interp, (Tcl_Command) cmdPtr,
			    elemObjPtr);
		} else {
		    elemObjPtr = Tcl_NewStringObj(simplePattern, -1);
		}
		Tcl_ListObjAppendElement(interp, listPtr, elemObjPtr);
	    }
	}
    } else
#endif /* !INFO_PROCS_SEARCH_GLOBAL_NS */
    {
	entryPtr = Tcl_FirstHashEntry(&nsPtr->cmdTable, &search);
	while (entryPtr != NULL) {
	    cmdName = Tcl_GetHashKey(&nsPtr->cmdTable, entryPtr);
	    if ((simplePattern == NULL)
		    || Tcl_StringMatch(cmdName, simplePattern)) {
		cmdPtr = Tcl_GetHashValue(entryPtr);

		if (!TclIsProc(cmdPtr)) {
		    realCmdPtr = (Command *)
			    TclGetOriginalCommand((Tcl_Command) cmdPtr);
		    if (realCmdPtr != NULL && TclIsProc(realCmdPtr)) {
			goto procOK;
		    }
		} else {
		procOK:
		    if (specificNsInPattern) {
			elemObjPtr = Tcl_NewObj();
			Tcl_GetCommandFullName(interp, (Tcl_Command) cmdPtr,
				elemObjPtr);
		    } else {
			elemObjPtr = Tcl_NewStringObj(cmdName, -1);
		    }
		    Tcl_ListObjAppendElement(interp, listPtr, elemObjPtr);
		}
	    }
	    entryPtr = Tcl_NextHashEntry(&search);
	}

	/*
	 * If the effective namespace isn't the global :: namespace, and a
	 * specific namespace wasn't requested in the pattern, then add in all
	 * global :: procs that match the simple pattern. Of course, we add in
	 * only those procs that aren't hidden by a proc in the effective
	 * namespace.
	 */

#ifdef INFO_PROCS_SEARCH_GLOBAL_NS
	/*
	 * If "info procs" worked like "info commands", returning the commands
	 * also seen in the global namespace, then you would include this
	 * code. As this could break backwards compatibilty with 8.0-8.2, we
	 * decided not to "fix" it in 8.3, leaving the behavior slightly
	 * different.
	 */

	if ((nsPtr != globalNsPtr) && !specificNsInPattern) {
	    entryPtr = Tcl_FirstHashEntry(&globalNsPtr->cmdTable, &search);
	    while (entryPtr != NULL) {
		cmdName = Tcl_GetHashKey(&globalNsPtr->cmdTable, entryPtr);
		if ((simplePattern == NULL)
			|| Tcl_StringMatch(cmdName, simplePattern)) {
		    if (Tcl_FindHashEntry(&nsPtr->cmdTable,cmdName) == NULL) {
			cmdPtr = Tcl_GetHashValue(entryPtr);
			realCmdPtr = (Command *) TclGetOriginalCommand(
				(Tcl_Command) cmdPtr);

			if (TclIsProc(cmdPtr) || ((realCmdPtr != NULL)
				&& TclIsProc(realCmdPtr))) {
			    Tcl_ListObjAppendElement(interp, listPtr,
				    Tcl_NewStringObj(cmdName, -1));
			}
		    }
		}
		entryPtr = Tcl_NextHashEntry(&search);
	    }
	}
#endif
    }

    Tcl_SetObjResult(interp, listPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoScriptCmd --
 *
 *	Called to implement the "info script" command that returns the script
 *	file that is currently being evaluated. Handles the following syntax:
 *
 *	    info script ?newName?
 *
 *	If newName is specified, it will set that as the internal name.
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message. It may change the internal
 *	script filename.
 *
 *----------------------------------------------------------------------
 */

static int
InfoScriptCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Interp *iPtr = (Interp *) interp;
    if ((objc != 1) && (objc != 2)) {
	Tcl_WrongNumArgs(interp, 1, objv, "?filename?");
	return TCL_ERROR;
    }

    if (objc == 2) {
	if (iPtr->scriptFile != NULL) {
	    Tcl_DecrRefCount(iPtr->scriptFile);
	}
	iPtr->scriptFile = objv[1];
	Tcl_IncrRefCount(iPtr->scriptFile);
    }
    if (iPtr->scriptFile != NULL) {
	Tcl_SetObjResult(interp, iPtr->scriptFile);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoSharedlibCmd --
 *
 *	Called to implement the "info sharedlibextension" command that returns
 *	the file extension used for shared libraries. Handles the following
 *	syntax:
 *
 *	    info sharedlibextension
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoSharedlibCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    if (objc != 1) {
	Tcl_WrongNumArgs(interp, 1, objv, NULL);
	return TCL_ERROR;
    }

#ifdef TCL_SHLIB_EXT
    Tcl_SetObjResult(interp, Tcl_NewStringObj(TCL_SHLIB_EXT, -1));
#endif
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * InfoTclVersionCmd --
 *
 *	Called to implement the "info tclversion" command that returns the
 *	version number for this Tcl library. Handles the following syntax:
 *
 *	    info tclversion
 *
 * Results:
 *	Returns TCL_OK if successful and TCL_ERROR if there is an error.
 *
 * Side effects:
 *	Returns a result in the interpreter's result object. If there is an
 *	error, the result is an error message.
 *
 *----------------------------------------------------------------------
 */

static int
InfoTclVersionCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Tcl_Obj *version;

    if (objc != 1) {
	Tcl_WrongNumArgs(interp, 1, objv, NULL);
	return TCL_ERROR;
    }

    version = Tcl_GetVar2Ex(interp, "tcl_version", NULL,
	    (TCL_GLOBAL_ONLY | TCL_LEAVE_ERR_MSG));
    if (version != NULL) {
	Tcl_SetObjResult(interp, version);
	return TCL_OK;
    }
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_JoinObjCmd --
 *
 *	This procedure is invoked to process the "join" Tcl command. See the
 *	user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_JoinObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* The argument objects. */
{
    int listLen;
    Tcl_Obj *resObjPtr = NULL, *joinObjPtr, **elemPtrs;

    if ((objc < 2) || (objc > 3)) {
	Tcl_WrongNumArgs(interp, 1, objv, "list ?joinString?");
	return TCL_ERROR;
    }

    /*
     * Make sure the list argument is a list object and get its length and a
     * pointer to its array of element pointers.
     */

    if (TclListObjGetElements(interp, objv[1], &listLen,
	    &elemPtrs) != TCL_OK) {
	return TCL_ERROR;
    }

    if (listLen == 0) {
	/* No elements to join; default empty result is correct. */
	return TCL_OK;
    }
    if (listLen == 1) {
	/* One element; return it */
	Tcl_SetObjResult(interp, elemPtrs[0]);
	return TCL_OK;
    }

    joinObjPtr = (objc == 2) ? Tcl_NewStringObj(" ", 1) : objv[2];
    Tcl_IncrRefCount(joinObjPtr);

    if (Tcl_GetCharLength(joinObjPtr) == 0) {
	TclStringCatObjv(interp, /* inPlace */ 0, listLen, elemPtrs,
		&resObjPtr);
    } else {
	int i;

	resObjPtr = Tcl_NewObj();
	for (i = 0;  i < listLen;  i++) {
	    if (i > 0) {

		/*
		 * NOTE: This code is relying on Tcl_AppendObjToObj() **NOT**
		 * to shimmer joinObjPtr.  If it did, then the case where
		 * objv[1] and objv[2] are the same value would not be safe.
		 * Accessing elemPtrs would crash.
		 */

		Tcl_AppendObjToObj(resObjPtr, joinObjPtr);
	    }
	    Tcl_AppendObjToObj(resObjPtr, elemPtrs[i]);
	}
    }
    Tcl_DecrRefCount(joinObjPtr);
    if (resObjPtr) {
	Tcl_SetObjResult(interp, resObjPtr);
	return TCL_OK;
    }
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_LassignObjCmd --
 *
 *	This object-based procedure is invoked to process the "lassign" Tcl
 *	command. See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_LassignObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Tcl_Obj *listCopyPtr;
    Tcl_Obj **listObjv;		/* The contents of the list. */
    int listObjc;		/* The length of the list. */
    int code = TCL_OK;

    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "list ?varName ...?");
	return TCL_ERROR;
    }

    listCopyPtr = TclListObjCopy(interp, objv[1]);
    if (listCopyPtr == NULL) {
	return TCL_ERROR;
    }

    TclListObjGetElements(NULL, listCopyPtr, &listObjc, &listObjv);

    objc -= 2;
    objv += 2;
    while (code == TCL_OK && objc > 0 && listObjc > 0) {
	if (Tcl_ObjSetVar2(interp, *objv++, NULL, *listObjv++,
		TCL_LEAVE_ERR_MSG) == NULL) {
	    code = TCL_ERROR;
	}
	objc--;
	listObjc--;
    }

    if (code == TCL_OK && objc > 0) {
	Tcl_Obj *emptyObj;

	TclNewObj(emptyObj);
	Tcl_IncrRefCount(emptyObj);
	while (code == TCL_OK && objc-- > 0) {
	    if (Tcl_ObjSetVar2(interp, *objv++, NULL, emptyObj,
		    TCL_LEAVE_ERR_MSG) == NULL) {
		code = TCL_ERROR;
	    }
	}
	Tcl_DecrRefCount(emptyObj);
    }

    if (code == TCL_OK && listObjc > 0) {
	Tcl_SetObjResult(interp, Tcl_NewListObj(listObjc, listObjv));
    }

    Tcl_DecrRefCount(listCopyPtr);
    return code;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_LindexObjCmd --
 *
 *	This object-based procedure is invoked to process the "lindex" Tcl
 *	command. See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_LindexObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{

    Tcl_Obj *elemPtr;		/* Pointer to the element being extracted. */

    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "list ?index ...?");
	return TCL_ERROR;
    }

    /*
     * If objc==3, then objv[2] may be either a single index or a list of
     * indices: go to TclLindexList to determine which. If objc>=4, or
     * objc==2, then objv[2 .. objc-2] are all single indices and processed as
     * such in TclLindexFlat.
     */

    if (objc == 3) {
	elemPtr = TclLindexList(interp, objv[1], objv[2]);
    } else {
	elemPtr = TclLindexFlat(interp, objv[1], objc-2, objv+2);
    }

    /*
     * Set the interpreter's object result to the last element extracted.
     */

    if (elemPtr == NULL) {
	return TCL_ERROR;
    }

    Tcl_SetObjResult(interp, elemPtr);
    Tcl_DecrRefCount(elemPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_LinsertObjCmd --
 *
 *	This object-based procedure is invoked to process the "linsert" Tcl
 *	command. See the user documentation for details on what it does.
 *
 * Results:
 *	A new Tcl list object formed by inserting zero or more elements into a
 *	list.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_LinsertObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    register int objc,		/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Tcl_Obj *listPtr;
    int index, len, result;

    if (objc < 3) {
	Tcl_WrongNumArgs(interp, 1, objv, "list index ?element ...?");
	return TCL_ERROR;
    }

    result = TclListObjLength(interp, objv[1], &len);
    if (result != TCL_OK) {
	return result;
    }

    /*
     * Get the index. "end" is interpreted to be the index after the last
     * element, such that using it will cause any inserted elements to be
     * appended to the list.
     */

    result = TclGetIntForIndexM(interp, objv[2], /*end*/ len, &index);
    if (result != TCL_OK) {
	return result;
    }
    if (index > len) {
	index = len;
    }

    /*
     * If the list object is unshared we can modify it directly. Otherwise we
     * create a copy to modify: this is "copy on write".
     */

    listPtr = objv[1];
    if (Tcl_IsShared(listPtr)) {
	listPtr = TclListObjCopy(NULL, listPtr);
    }

    if ((objc == 4) && (index == len)) {
	/*
	 * Special case: insert one element at the end of the list.
	 */

	Tcl_ListObjAppendElement(NULL, listPtr, objv[3]);
    } else {
	if (TCL_OK != Tcl_ListObjReplace(interp, listPtr, index, 0,
		(objc-3), &(objv[3]))) {
	    return TCL_ERROR;
	}
    }

    /*
     * Set the interpreter's object result.
     */

    Tcl_SetObjResult(interp, listPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ListObjCmd --
 *
 *	This procedure is invoked to process the "list" Tcl command. See the
 *	user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_ListObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    register int objc,		/* Number of arguments. */
    register Tcl_Obj *const objv[])
				/* The argument objects. */
{
    /*
     * If there are no list elements, the result is an empty object.
     * Otherwise set the interpreter's result object to be a list object.
     */

    if (objc > 1) {
	Tcl_SetObjResult(interp, Tcl_NewListObj(objc-1, &objv[1]));
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_LlengthObjCmd --
 *
 *	This object-based procedure is invoked to process the "llength" Tcl
 *	command. See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_LlengthObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    register Tcl_Obj *const objv[])
				/* Argument objects. */
{
    int listLen, result;

    if (objc != 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "list");
	return TCL_ERROR;
    }

    result = TclListObjLength(interp, objv[1], &listLen);
    if (result != TCL_OK) {
	return result;
    }

    /*
     * Set the interpreter's object result to an integer object holding the
     * length.
     */

    Tcl_SetObjResult(interp, Tcl_NewIntObj(listLen));
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_LrangeObjCmd --
 *
 *	This procedure is invoked to process the "lrange" Tcl command. See the
 *	user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_LrangeObjCmd(
    ClientData notUsed,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    register Tcl_Obj *const objv[])
				/* Argument objects. */
{
    Tcl_Obj **elemPtrs;
    int listLen, first, last, result;

    if (objc != 4) {
	Tcl_WrongNumArgs(interp, 1, objv, "list first last");
	return TCL_ERROR;
    }

    result = TclListObjLength(interp, objv[1], &listLen);
    if (result != TCL_OK) {
	return result;
    }

    result = TclGetIntForIndexM(interp, objv[2], /*endValue*/ listLen - 1,
	    &first);
    if (result != TCL_OK) {
	return result;
    }
    if (first < 0) {
	first = 0;
    }

    result = TclGetIntForIndexM(interp, objv[3], /*endValue*/ listLen - 1,
	    &last);
    if (result != TCL_OK) {
	return result;
    }
    if (last >= listLen) {
	last = listLen - 1;
    }

    if (first > last) {
	/*
	 * Returning an empty list is easy.
	 */

	return TCL_OK;
    }

    result = TclListObjGetElements(interp, objv[1], &listLen, &elemPtrs);
    if (result != TCL_OK) {
	return result;
    }

    if (Tcl_IsShared(objv[1]) ||
	    ((ListRepPtr(objv[1])->refCount > 1))) {
	Tcl_SetObjResult(interp, Tcl_NewListObj(last - first + 1,
		&elemPtrs[first]));
    } else {
	/*
	 * In-place is possible.
	 */

	if (last < (listLen - 1)) {
	    Tcl_ListObjReplace(interp, objv[1], last + 1, listLen - 1 - last,
		    0, NULL);
	}

	/*
	 * This one is not conditioned on (first > 0) in order to preserve the
	 * string-canonizing effect of [lrange 0 end].
	 */

	Tcl_ListObjReplace(interp, objv[1], 0, first, 0, NULL);
	Tcl_SetObjResult(interp, objv[1]);
    }

    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_LrepeatObjCmd --
 *
 *	This procedure is invoked to process the "lrepeat" Tcl command. See
 *	the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_LrepeatObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    register int objc,		/* Number of arguments. */
    register Tcl_Obj *const objv[])
				/* The argument objects. */
{
    int elementCount, i, totalElems;
    Tcl_Obj *listPtr, **dataArray = NULL;

    /*
     * Check arguments for legality:
     *		lrepeat count ?value ...?
     */

    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "count ?value ...?");
	return TCL_ERROR;
    }
    if (TCL_OK != TclGetIntFromObj(interp, objv[1], &elementCount)) {
	return TCL_ERROR;
    }
    if (elementCount < 0) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"bad count \"%d\": must be integer >= 0", elementCount));
	Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LREPEAT", "NEGARG",
		NULL);
	return TCL_ERROR;
    }

    /*
     * Skip forward to the interesting arguments now we've finished parsing.
     */

    objc -= 2;
    objv += 2;

    /* Final sanity check. Do not exceed limits on max list length. */

    if (elementCount && objc > LIST_MAX/elementCount) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"max length of a Tcl list (%d elements) exceeded", LIST_MAX));
	Tcl_SetErrorCode(interp, "TCL", "MEMORY", NULL);
	return TCL_ERROR;
    }
    totalElems = objc * elementCount;

    /*
     * Get an empty list object that is allocated large enough to hold each
     * init value elementCount times.
     */

    listPtr = Tcl_NewListObj(totalElems, NULL);
    if (totalElems) {
	List *listRepPtr = ListRepPtr(listPtr);

	listRepPtr->elemCount = elementCount*objc;
	dataArray = &listRepPtr->elements;
    }

    /*
     * Set the elements. Note that we handle the common degenerate case of a
     * single value being repeated separately to permit the compiler as much
     * room as possible to optimize a loop that might be run a very large
     * number of times.
     */

    CLANG_ASSERT(dataArray || totalElems == 0 );
    if (objc == 1) {
	register Tcl_Obj *tmpPtr = objv[0];

	tmpPtr->refCount += elementCount;
	for (i=0 ; i<elementCount ; i++) {
	    dataArray[i] = tmpPtr;
	}
    } else {
	int j, k = 0;

	for (i=0 ; i<elementCount ; i++) {
	    for (j=0 ; j<objc ; j++) {
		Tcl_IncrRefCount(objv[j]);
		dataArray[k++] = objv[j];
	    }
	}
    }

    Tcl_SetObjResult(interp, listPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_LreplaceObjCmd --
 *
 *	This object-based procedure is invoked to process the "lreplace" Tcl
 *	command. See the user documentation for details on what it does.
 *
 * Results:
 *	A new Tcl list object formed by replacing zero or more elements of a
 *	list.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_LreplaceObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    register Tcl_Obj *listPtr;
    int first, last, listLen, numToDelete, result;

    if (objc < 4) {
	Tcl_WrongNumArgs(interp, 1, objv,
		"list first last ?element ...?");
	return TCL_ERROR;
    }

    result = TclListObjLength(interp, objv[1], &listLen);
    if (result != TCL_OK) {
	return result;
    }

    /*
     * Get the first and last indexes. "end" is interpreted to be the index
     * for the last element, such that using it will cause that element to be
     * included for deletion.
     */

    result = TclGetIntForIndexM(interp, objv[2], /*end*/ listLen-1, &first);
    if (result != TCL_OK) {
	return result;
    }

    result = TclGetIntForIndexM(interp, objv[3], /*end*/ listLen-1, &last);
    if (result != TCL_OK) {
	return result;
    }

    if (first < 0) {
	first = 0;
    }

    /*
     * Complain if the user asked for a start element that is greater than the
     * list length. This won't ever trigger for the "end-*" case as that will
     * be properly constrained by TclGetIntForIndex because we use listLen-1
     * (to allow for replacing the last elem).
     */

    if ((first > listLen) && (listLen > 0)) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"list doesn't contain element %s", TclGetString(objv[2])));
	Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LREPLACE", "BADIDX",
		NULL);
	return TCL_ERROR;
    }
    if (last >= listLen) {
	last = listLen - 1;
    }
    if (first <= last) {
	numToDelete = last - first + 1;
    } else {
	numToDelete = 0;
    }

    /*
     * If the list object is unshared we can modify it directly, otherwise we
     * create a copy to modify: this is "copy on write".
     */

    listPtr = objv[1];
    if (Tcl_IsShared(listPtr)) {
	listPtr = TclListObjCopy(NULL, listPtr);
    }

    /*
     * Note that we call Tcl_ListObjReplace even when numToDelete == 0 and
     * objc == 4. In this case, the list value of listPtr is not changed (no
     * elements are removed or added), but by making the call we are assured
     * we end up with a list in canonical form. Resist any temptation to
     * optimize this case away.
     */

    if (TCL_OK != Tcl_ListObjReplace(interp, listPtr, first, numToDelete,
	    objc-4, objv+4)) {
	return TCL_ERROR;
    }

    /*
     * Set the interpreter's object result.
     */

    Tcl_SetObjResult(interp, listPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_LreverseObjCmd --
 *
 *	This procedure is invoked to process the "lreverse" Tcl command. See
 *	the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_LreverseObjCmd(
    ClientData clientData,	/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument values. */
{
    Tcl_Obj **elemv;
    int elemc, i, j;

    if (objc != 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "list");
	return TCL_ERROR;
    }
    if (TclListObjGetElements(interp, objv[1], &elemc, &elemv) != TCL_OK) {
	return TCL_ERROR;
    }

    /*
     * If the list is empty, just return it. [Bug 1876793]
     */

    if (!elemc) {
	Tcl_SetObjResult(interp, objv[1]);
	return TCL_OK;
    }

    if (Tcl_IsShared(objv[1])
	    || (ListRepPtr(objv[1])->refCount > 1)) {	/* Bug 1675044 */
	Tcl_Obj *resultObj, **dataArray;
	List *listRepPtr;

	resultObj = Tcl_NewListObj(elemc, NULL);
	listRepPtr = ListRepPtr(resultObj);
	listRepPtr->elemCount = elemc;
	dataArray = &listRepPtr->elements;

	for (i=0,j=elemc-1 ; i<elemc ; i++,j--) {
	    dataArray[j] = elemv[i];
	    Tcl_IncrRefCount(elemv[i]);
	}

	Tcl_SetObjResult(interp, resultObj);
    } else {

	/*
	 * Not shared, so swap "in place". This relies on Tcl_LOGE above
	 * returning a pointer to the live array of Tcl_Obj values.
	 */

	for (i=0,j=elemc-1 ; i<j ; i++,j--) {
	    Tcl_Obj *tmp = elemv[i];

	    elemv[i] = elemv[j];
	    elemv[j] = tmp;
	}
	TclInvalidateStringRep(objv[1]);
	Tcl_SetObjResult(interp, objv[1]);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_LsearchObjCmd --
 *
 *	This procedure is invoked to process the "lsearch" Tcl command. See
 *	the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_LsearchObjCmd(
    ClientData clientData,	/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument values. */
{
    const char *bytes, *patternBytes;
    int i, match, index, result, listc, length, elemLen, bisect;
    int dataType, isIncreasing, lower, upper, offset;
    Tcl_WideInt patWide, objWide;
    int allMatches, inlineReturn, negatedMatch, returnSubindices, noCase;
    double patDouble, objDouble;
    SortInfo sortInfo;
    Tcl_Obj *patObj, **listv, *listPtr, *startPtr, *itemPtr;
    SortStrCmpFn_t strCmpFn = strcmp;
    Tcl_RegExp regexp = NULL;
    static const char *const options[] = {
	"-all",	    "-ascii",   "-bisect", "-decreasing", "-dictionary",
	"-exact",   "-glob",    "-increasing", "-index",
	"-inline",  "-integer", "-nocase",     "-not",
	"-real",    "-regexp",  "-sorted",     "-start",
	"-subindices", NULL
    };
    enum options {
	LSEARCH_ALL, LSEARCH_ASCII, LSEARCH_BISECT, LSEARCH_DECREASING,
	LSEARCH_DICTIONARY, LSEARCH_EXACT, LSEARCH_GLOB, LSEARCH_INCREASING,
	LSEARCH_INDEX, LSEARCH_INLINE, LSEARCH_INTEGER, LSEARCH_NOCASE,
	LSEARCH_NOT, LSEARCH_REAL, LSEARCH_REGEXP, LSEARCH_SORTED,
	LSEARCH_START, LSEARCH_SUBINDICES
    };
    enum datatypes {
	ASCII, DICTIONARY, INTEGER, REAL
    };
    enum modes {
	EXACT, GLOB, REGEXP, SORTED
    };
    enum modes mode;

    mode = GLOB;
    dataType = ASCII;
    isIncreasing = 1;
    allMatches = 0;
    inlineReturn = 0;
    returnSubindices = 0;
    negatedMatch = 0;
    bisect = 0;
    listPtr = NULL;
    startPtr = NULL;
    offset = 0;
    noCase = 0;
    sortInfo.compareCmdPtr = NULL;
    sortInfo.isIncreasing = 1;
    sortInfo.sortMode = 0;
    sortInfo.interp = interp;
    sortInfo.resultCode = TCL_OK;
    sortInfo.indexv = NULL;
    sortInfo.indexc = 0;

    if (objc < 3) {
	Tcl_WrongNumArgs(interp, 1, objv, "?-option value ...? list pattern");
	return TCL_ERROR;
    }

    for (i = 1; i < objc-2; i++) {
	if (Tcl_GetIndexFromObj(interp, objv[i], options, "option", 0, &index)
		!= TCL_OK) {
	    if (startPtr != NULL) {
		Tcl_DecrRefCount(startPtr);
	    }
	    result = TCL_ERROR;
	    goto done;
	}
	switch ((enum options) index) {
	case LSEARCH_ALL:		/* -all */
	    allMatches = 1;
	    break;
	case LSEARCH_ASCII:		/* -ascii */
	    dataType = ASCII;
	    break;
	case LSEARCH_BISECT:		/* -bisect */
	    mode = SORTED;
	    bisect = 1;
	    break;
	case LSEARCH_DECREASING:	/* -decreasing */
	    isIncreasing = 0;
	    sortInfo.isIncreasing = 0;
	    break;
	case LSEARCH_DICTIONARY:	/* -dictionary */
	    dataType = DICTIONARY;
	    break;
	case LSEARCH_EXACT:		/* -increasing */
	    mode = EXACT;
	    break;
	case LSEARCH_GLOB:		/* -glob */
	    mode = GLOB;
	    break;
	case LSEARCH_INCREASING:	/* -increasing */
	    isIncreasing = 1;
	    sortInfo.isIncreasing = 1;
	    break;
	case LSEARCH_INLINE:		/* -inline */
	    inlineReturn = 1;
	    break;
	case LSEARCH_INTEGER:		/* -integer */
	    dataType = INTEGER;
	    break;
	case LSEARCH_NOCASE:		/* -nocase */
	    strCmpFn = TclUtfCasecmp;
	    noCase = 1;
	    break;
	case LSEARCH_NOT:		/* -not */
	    negatedMatch = 1;
	    break;
	case LSEARCH_REAL:		/* -real */
	    dataType = REAL;
	    break;
	case LSEARCH_REGEXP:		/* -regexp */
	    mode = REGEXP;
	    break;
	case LSEARCH_SORTED:		/* -sorted */
	    mode = SORTED;
	    break;
	case LSEARCH_SUBINDICES:	/* -subindices */
	    returnSubindices = 1;
	    break;
	case LSEARCH_START:		/* -start */
	    /*
	     * If there was a previous -start option, release its saved index
	     * because it will either be replaced or there will be an error.
	     */

	    if (startPtr != NULL) {
		Tcl_DecrRefCount(startPtr);
	    }
	    if (i > objc-4) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"missing starting index", -1));
		Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "MISSING", NULL);
		result = TCL_ERROR;
		goto done;
	    }
	    i++;
	    if (objv[i] == objv[objc - 2]) {
		/*
		 * Take copy to prevent shimmering problems. Note that it does
		 * not matter if the index obj is also a component of the list
		 * being searched. We only need to copy where the list and the
		 * index are one-and-the-same.
		 */

		startPtr = Tcl_DuplicateObj(objv[i]);
	    } else {
		startPtr = objv[i];
		Tcl_IncrRefCount(startPtr);
	    }
	    break;
	case LSEARCH_INDEX: {		/* -index */
	    Tcl_Obj **indices;
	    int j;

	    if (sortInfo.indexc > 1) {
		TclStackFree(interp, sortInfo.indexv);
	    }
	    if (i > objc-4) {
		if (startPtr != NULL) {
		    Tcl_DecrRefCount(startPtr);
		}
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"\"-index\" option must be followed by list index",
			-1));
		Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "MISSING", NULL);
		return TCL_ERROR;
	    }

	    /*
	     * Store the extracted indices for processing by sublist
	     * extraction. Note that we don't do this using objects because
	     * that has shimmering problems.
	     */

	    i++;
	    if (TclListObjGetElements(interp, objv[i],
		    &sortInfo.indexc, &indices) != TCL_OK) {
		if (startPtr != NULL) {
		    Tcl_DecrRefCount(startPtr);
		}
		return TCL_ERROR;
	    }
	    switch (sortInfo.indexc) {
	    case 0:
		sortInfo.indexv = NULL;
		break;
	    case 1:
		sortInfo.indexv = &sortInfo.singleIndex;
		break;
	    default:
		sortInfo.indexv =
			TclStackAlloc(interp, sizeof(int) * sortInfo.indexc);
	    }

	    /*
	     * Fill the array by parsing each index. We don't know whether
	     * their scale is sensible yet, but we at least perform the
	     * syntactic check here.
	     */

	    for (j=0 ; j<sortInfo.indexc ; j++) {
		if (TclGetIntForIndexM(interp, indices[j], SORTIDX_END,
			&sortInfo.indexv[j]) != TCL_OK) {
		    Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
			    "\n    (-index option item number %d)", j));
		    result = TCL_ERROR;
		    goto done;
		}
	    }
	    break;
	}
	}
    }

    /*
     * Subindices only make sense if asked for with -index option set.
     */

    if (returnSubindices && sortInfo.indexc==0) {
	if (startPtr != NULL) {
	    Tcl_DecrRefCount(startPtr);
	}
	Tcl_SetObjResult(interp, Tcl_NewStringObj(
		"-subindices cannot be used without -index option", -1));
	Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSEARCH",
		"BAD_OPTION_MIX", NULL);
	return TCL_ERROR;
    }

    if (bisect && (allMatches || negatedMatch)) {
	Tcl_SetObjResult(interp, Tcl_NewStringObj(
		"-bisect is not compatible with -all or -not", -1));
	Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSEARCH",
		"BAD_OPTION_MIX", NULL);
	return TCL_ERROR;
    }

    if (mode == REGEXP) {
	/*
	 * We can shimmer regexp/list if listv[i] == pattern, so get the
	 * regexp rep before the list rep. First time round, omit the interp
	 * and hope that the compilation will succeed. If it fails, we'll
	 * recompile in "expensive" mode with a place to put error messages.
	 */

	regexp = Tcl_GetRegExpFromObj(NULL, objv[objc - 1],
		TCL_REG_ADVANCED | TCL_REG_NOSUB |
		(noCase ? TCL_REG_NOCASE : 0));
	if (regexp == NULL) {
	    /*
	     * Failed to compile the RE. Try again without the TCL_REG_NOSUB
	     * flag in case the RE had sub-expressions in it [Bug 1366683]. If
	     * this fails, an error message will be left in the interpreter.
	     */

	    regexp = Tcl_GetRegExpFromObj(interp, objv[objc - 1],
		    TCL_REG_ADVANCED | (noCase ? TCL_REG_NOCASE : 0));
	}

	if (regexp == NULL) {
	    if (startPtr != NULL) {
		Tcl_DecrRefCount(startPtr);
	    }
	    result = TCL_ERROR;
	    goto done;
	}
    }

    /*
     * Make sure the list argument is a list object and get its length and a
     * pointer to its array of element pointers.
     */

    result = TclListObjGetElements(interp, objv[objc - 2], &listc, &listv);
    if (result != TCL_OK) {
	if (startPtr != NULL) {
	    Tcl_DecrRefCount(startPtr);
	}
	goto done;
    }

    /*
     * Get the user-specified start offset.
     */

    if (startPtr) {
	result = TclGetIntForIndexM(interp, startPtr, listc-1, &offset);
	Tcl_DecrRefCount(startPtr);
	if (result != TCL_OK) {
	    goto done;
	}
	if (offset < 0) {
	    offset = 0;
	}

	/*
	 * If the search started past the end of the list, we just return a
	 * "did not match anything at all" result straight away. [Bug 1374778]
	 */

	if (offset > listc-1) {
	    if (sortInfo.indexc > 1) {
		TclStackFree(interp, sortInfo.indexv);
	    }
	    if (allMatches || inlineReturn) {
		Tcl_ResetResult(interp);
	    } else {
		Tcl_SetObjResult(interp, Tcl_NewIntObj(-1));
	    }
	    return TCL_OK;
	}
    }

    patObj = objv[objc - 1];
    patternBytes = NULL;
    if (mode == EXACT || mode == SORTED) {
	switch ((enum datatypes) dataType) {
	case ASCII:
	case DICTIONARY:
	    patternBytes = TclGetStringFromObj(patObj, &length);
	    break;
	case INTEGER:
	    result = TclGetWideIntFromObj(interp, patObj, &patWide);
	    if (result != TCL_OK) {
		goto done;
	    }

	    /*
	     * List representation might have been shimmered; restore it. [Bug
	     * 1844789]
	     */

	    TclListObjGetElements(NULL, objv[objc - 2], &listc, &listv);
	    break;
	case REAL:
	    result = Tcl_GetDoubleFromObj(interp, patObj, &patDouble);
	    if (result != TCL_OK) {
		goto done;
	    }

	    /*
	     * List representation might have been shimmered; restore it. [Bug
	     * 1844789]
	     */

	    TclListObjGetElements(NULL, objv[objc - 2], &listc, &listv);
	    break;
	}
    } else {
	patternBytes = TclGetStringFromObj(patObj, &length);
    }

    /*
     * Set default index value to -1, indicating failure; if we find the item
     * in the course of our search, index will be set to the correct value.
     */

    index = -1;
    match = 0;

    if (mode == SORTED && !allMatches && !negatedMatch) {
	/*
	 * If the data is sorted, we can do a more intelligent search. Note
	 * that there is no point in being smart when -all was specified; in
	 * that case, we have to look at all items anyway, and there is no
	 * sense in doing this when the match sense is inverted.
	 */

	lower = offset - 1;
	upper = listc;
	while (lower + 1 != upper && sortInfo.resultCode == TCL_OK) {
	    i = (lower + upper)/2;
	    if (sortInfo.indexc != 0) {
		itemPtr = SelectObjFromSublist(listv[i], &sortInfo);
		if (sortInfo.resultCode != TCL_OK) {
		    result = sortInfo.resultCode;
		    goto done;
		}
	    } else {
		itemPtr = listv[i];
	    }
	    switch ((enum datatypes) dataType) {
	    case ASCII:
		bytes = TclGetString(itemPtr);
		match = strCmpFn(patternBytes, bytes);
		break;
	    case DICTIONARY:
		bytes = TclGetString(itemPtr);
		match = DictionaryCompare(patternBytes, bytes);
		break;
	    case INTEGER:
		result = TclGetWideIntFromObj(interp, itemPtr, &objWide);
		if (result != TCL_OK) {
		    goto done;
		}
		if (patWide == objWide) {
		    match = 0;
		} else if (patWide < objWide) {
		    match = -1;
		} else {
		    match = 1;
		}
		break;
	    case REAL:
		result = Tcl_GetDoubleFromObj(interp, itemPtr, &objDouble);
		if (result != TCL_OK) {
		    goto done;
		}
		if (patDouble == objDouble) {
		    match = 0;
		} else if (patDouble < objDouble) {
		    match = -1;
		} else {
		    match = 1;
		}
		break;
	    }
	    if (match == 0) {
		/*
		 * Normally, binary search is written to stop when it finds a
		 * match. If there are duplicates of an element in the list,
		 * our first match might not be the first occurance.
		 * Consider: 0 0 0 1 1 1 2 2 2
		 *
		 * To maintain consistancy with standard lsearch semantics, we
		 * must find the leftmost occurance of the pattern in the
		 * list. Thus we don't just stop searching here. This
		 * variation means that a search always makes log n
		 * comparisons (normal binary search might "get lucky" with an
		 * early comparison).
		 *
		 * In bisect mode though, we want the last of equals.
		 */

		index = i;
		if (bisect) {
		    lower = i;
		} else {
		    upper = i;
		}
	    } else if (match > 0) {
		if (isIncreasing) {
		    lower = i;
		} else {
		    upper = i;
		}
	    } else {
		if (isIncreasing) {
		    upper = i;
		} else {
		    lower = i;
		}
	    }
	}
	if (bisect && index < 0) {
	    index = lower;
	}
    } else {
	/*
	 * We need to do a linear search, because (at least one) of:
	 *   - our matcher can only tell equal vs. not equal
	 *   - our matching sense is negated
	 *   - we're building a list of all matched items
	 */

	if (allMatches) {
	    listPtr = Tcl_NewListObj(0, NULL);
	}
	for (i = offset; i < listc; i++) {
	    match = 0;
	    if (sortInfo.indexc != 0) {
		itemPtr = SelectObjFromSublist(listv[i], &sortInfo);
		if (sortInfo.resultCode != TCL_OK) {
		    if (listPtr != NULL) {
			Tcl_DecrRefCount(listPtr);
		    }
		    result = sortInfo.resultCode;
		    goto done;
		}
	    } else {
		itemPtr = listv[i];
	    }

	    switch (mode) {
	    case SORTED:
	    case EXACT:
		switch ((enum datatypes) dataType) {
		case ASCII:
		    bytes = TclGetStringFromObj(itemPtr, &elemLen);
		    if (length == elemLen) {
			/*
			 * This split allows for more optimal compilation of
			 * memcmp/strcasecmp.
			 */

			if (noCase) {
			    match = (TclUtfCasecmp(bytes, patternBytes) == 0);
			} else {
			    match = (memcmp(bytes, patternBytes,
				    (size_t) length) == 0);
			}
		    }
		    break;

		case DICTIONARY:
		    bytes = TclGetString(itemPtr);
		    match = (DictionaryCompare(bytes, patternBytes) == 0);
		    break;

		case INTEGER:
		    result = TclGetWideIntFromObj(interp, itemPtr, &objWide);
		    if (result != TCL_OK) {
			if (listPtr != NULL) {
			    Tcl_DecrRefCount(listPtr);
			}
			goto done;
		    }
		    match = (objWide == patWide);
		    break;

		case REAL:
		    result = Tcl_GetDoubleFromObj(interp,itemPtr, &objDouble);
		    if (result != TCL_OK) {
			if (listPtr) {
			    Tcl_DecrRefCount(listPtr);
			}
			goto done;
		    }
		    match = (objDouble == patDouble);
		    break;
		}
		break;

	    case GLOB:
		match = Tcl_StringCaseMatch(TclGetString(itemPtr),
			patternBytes, noCase);
		break;

	    case REGEXP:
		match = Tcl_RegExpExecObj(interp, regexp, itemPtr, 0, 0, 0);
		if (match < 0) {
		    Tcl_DecrRefCount(patObj);
		    if (listPtr != NULL) {
			Tcl_DecrRefCount(listPtr);
		    }
		    result = TCL_ERROR;
		    goto done;
		}
		break;
	    }

	    /*
	     * Invert match condition for -not.
	     */

	    if (negatedMatch) {
		match = !match;
	    }
	    if (!match) {
		continue;
	    }
	    if (!allMatches) {
		index = i;
		break;
	    } else if (inlineReturn) {
		/*
		 * Note that these appends are not expected to fail.
		 */

		if (returnSubindices && (sortInfo.indexc != 0)) {
		    itemPtr = SelectObjFromSublist(listv[i], &sortInfo);
		} else {
		    itemPtr = listv[i];
		}
		Tcl_ListObjAppendElement(interp, listPtr, itemPtr);
	    } else if (returnSubindices) {
		int j;

		itemPtr = Tcl_NewIntObj(i);
		for (j=0 ; j<sortInfo.indexc ; j++) {
		    Tcl_ListObjAppendElement(interp, itemPtr,
			    Tcl_NewIntObj(sortInfo.indexv[j]));
		}
		Tcl_ListObjAppendElement(interp, listPtr, itemPtr);
	    } else {
		Tcl_ListObjAppendElement(interp, listPtr, Tcl_NewIntObj(i));
	    }
	}
    }

    /*
     * Return everything or a single value.
     */

    if (allMatches) {
	Tcl_SetObjResult(interp, listPtr);
    } else if (!inlineReturn) {
	if (returnSubindices) {
	    int j;

	    itemPtr = Tcl_NewIntObj(index);
	    for (j=0 ; j<sortInfo.indexc ; j++) {
		Tcl_ListObjAppendElement(interp, itemPtr,
			Tcl_NewIntObj(sortInfo.indexv[j]));
	    }
	    Tcl_SetObjResult(interp, itemPtr);
	} else {
	    Tcl_SetObjResult(interp, Tcl_NewIntObj(index));
	}
    } else if (index < 0) {
	/*
	 * Is this superfluous? The result should be a blank object by
	 * default...
	 */

	Tcl_SetObjResult(interp, Tcl_NewObj());
    } else {
	Tcl_SetObjResult(interp, listv[index]);
    }
    result = TCL_OK;

    /*
     * Cleanup the index list array.
     */

  done:
    if (sortInfo.indexc > 1) {
	TclStackFree(interp, sortInfo.indexv);
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_LsetObjCmd --
 *
 *	This procedure is invoked to process the "lset" Tcl command. See the
 *	user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_LsetObjCmd(
    ClientData clientData,	/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument values. */
{
    Tcl_Obj *listPtr;		/* Pointer to the list being altered. */
    Tcl_Obj *finalValuePtr;	/* Value finally assigned to the variable. */

    /*
     * Check parameter count.
     */

    if (objc < 3) {
	Tcl_WrongNumArgs(interp, 1, objv,
		"listVar ?index? ?index ...? value");
	return TCL_ERROR;
    }

    /*
     * Look up the list variable's value.
     */

    listPtr = Tcl_ObjGetVar2(interp, objv[1], NULL, TCL_LEAVE_ERR_MSG);
    if (listPtr == NULL) {
	return TCL_ERROR;
    }

    /*
     * Substitute the value in the value. Return either the value or else an
     * unshared copy of it.
     */

    if (objc == 4) {
	finalValuePtr = TclLsetList(interp, listPtr, objv[2], objv[3]);
    } else {
	finalValuePtr = TclLsetFlat(interp, listPtr, objc-3, objv+2,
		objv[objc-1]);
    }

    /*
     * If substitution has failed, bail out.
     */

    if (finalValuePtr == NULL) {
	return TCL_ERROR;
    }

    /*
     * Finally, update the variable so that traces fire.
     */

    listPtr = Tcl_ObjSetVar2(interp, objv[1], NULL, finalValuePtr,
	    TCL_LEAVE_ERR_MSG);
    Tcl_DecrRefCount(finalValuePtr);
    if (listPtr == NULL) {
	return TCL_ERROR;
    }

    /*
     * Return the new value of the variable as the interpreter result.
     */

    Tcl_SetObjResult(interp, listPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_LsortObjCmd --
 *
 *	This procedure is invoked to process the "lsort" Tcl command. See the
 *	user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_LsortObjCmd(
    ClientData clientData,	/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument values. */
{
    int i, j, index, indices, length, nocase = 0, indexc;
    int sortMode = SORTMODE_ASCII;
    int group, groupSize, groupOffset, idx, allocatedIndexVector = 0;
    Tcl_Obj *resultPtr, *cmdPtr, **listObjPtrs, *listObj, *indexPtr;
    SortElement *elementArray = NULL, *elementPtr;
    SortInfo sortInfo;		/* Information about this sort that needs to
				 * be passed to the comparison function. */
#   define NUM_LISTS 30
    SortElement *subList[NUM_LISTS+1];
				/* This array holds pointers to temporary
				 * lists built during the merge sort. Element
				 * i of the array holds a list of length
				 * 2**i. */
    static const char *const switches[] = {
	"-ascii", "-command", "-decreasing", "-dictionary", "-increasing",
	"-index", "-indices", "-integer", "-nocase", "-real", "-stride",
	"-unique", NULL
    };
    enum Lsort_Switches {
	LSORT_ASCII, LSORT_COMMAND, LSORT_DECREASING, LSORT_DICTIONARY,
	LSORT_INCREASING, LSORT_INDEX, LSORT_INDICES, LSORT_INTEGER,
	LSORT_NOCASE, LSORT_REAL, LSORT_STRIDE, LSORT_UNIQUE
    };

    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "?-option value ...? list");
	return TCL_ERROR;
    }

    /*
     * Parse arguments to set up the mode for the sort.
     */

    sortInfo.isIncreasing = 1;
    sortInfo.sortMode = SORTMODE_ASCII;
    sortInfo.indexv = NULL;
    sortInfo.indexc = 0;
    sortInfo.unique = 0;
    sortInfo.interp = interp;
    sortInfo.resultCode = TCL_OK;
    cmdPtr = NULL;
    indices = 0;
    group = 0;
    groupSize = 1;
    groupOffset = 0;
    indexPtr = NULL;
    for (i = 1; i < objc-1; i++) {
	if (Tcl_GetIndexFromObj(interp, objv[i], switches, "option", 0,
		&index) != TCL_OK) {
	    sortInfo.resultCode = TCL_ERROR;
	    goto done;
	}
	switch ((enum Lsort_Switches) index) {
	case LSORT_ASCII:
	    sortInfo.sortMode = SORTMODE_ASCII;
	    break;
	case LSORT_COMMAND:
	    if (i == objc-2) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"\"-command\" option must be followed "
			"by comparison command", -1));
		Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "MISSING", NULL);
		sortInfo.resultCode = TCL_ERROR;
		goto done;
	    }
	    sortInfo.sortMode = SORTMODE_COMMAND;
	    cmdPtr = objv[i+1];
	    i++;
	    break;
	case LSORT_DECREASING:
	    sortInfo.isIncreasing = 0;
	    break;
	case LSORT_DICTIONARY:
	    sortInfo.sortMode = SORTMODE_DICTIONARY;
	    break;
	case LSORT_INCREASING:
	    sortInfo.isIncreasing = 1;
	    break;
	case LSORT_INDEX: {
	    int indexc, dummy;
	    Tcl_Obj **indexv;

	    if (i == objc-2) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"\"-index\" option must be followed by list index",
			-1));
		Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "MISSING", NULL);
		sortInfo.resultCode = TCL_ERROR;
		goto done;
	    }
	    if (TclListObjGetElements(interp, objv[i+1], &indexc,
		    &indexv) != TCL_OK) {
		sortInfo.resultCode = TCL_ERROR;
		goto done;
	    }

	    /*
	     * Check each of the indices for syntactic correctness. Note that
	     * we do not store the converted values here because we do not
	     * know if this is the only -index option yet and so we can't
	     * allocate any space; that happens after the scan through all the
	     * options is done.
	     */

	    for (j=0 ; j<indexc ; j++) {
		if (TclGetIntForIndexM(interp, indexv[j], SORTIDX_END,
			&dummy) != TCL_OK) {
		    Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
			    "\n    (-index option item number %d)", j));
		    sortInfo.resultCode = TCL_ERROR;
		    goto done;
		}
	    }
	    indexPtr = objv[i+1];
	    i++;
	    break;
	}
	case LSORT_INTEGER:
	    sortInfo.sortMode = SORTMODE_INTEGER;
	    break;
	case LSORT_NOCASE:
	    nocase = 1;
	    break;
	case LSORT_REAL:
	    sortInfo.sortMode = SORTMODE_REAL;
	    break;
	case LSORT_UNIQUE:
	    sortInfo.unique = 1;
	    break;
	case LSORT_INDICES:
	    indices = 1;
	    break;
	case LSORT_STRIDE:
	    if (i == objc-2) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"\"-stride\" option must be "
			"followed by stride length", -1));
		Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "MISSING", NULL);
		sortInfo.resultCode = TCL_ERROR;
		goto done;
	    }
	    if (Tcl_GetIntFromObj(interp, objv[i+1], &groupSize) != TCL_OK) {
		sortInfo.resultCode = TCL_ERROR;
		goto done;
	    }
	    if (groupSize < 2) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"stride length must be at least 2", -1));
		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSORT",
			"BADSTRIDE", NULL);
		sortInfo.resultCode = TCL_ERROR;
		goto done;
	    }
	    group = 1;
	    i++;
	    break;
	}
    }
    if (nocase && (sortInfo.sortMode == SORTMODE_ASCII)) {
	sortInfo.sortMode = SORTMODE_ASCII_NC;
    }

    /*
     * Now extract the -index list for real, if present. No failures are
     * expected here; the values are all of the right type or convertible to
     * it.
     */

    if (indexPtr) {
	Tcl_Obj **indexv;

	TclListObjGetElements(interp, indexPtr, &sortInfo.indexc, &indexv);
	switch (sortInfo.indexc) {
	case 0:
	    sortInfo.indexv = NULL;
	    break;
	case 1:
	    sortInfo.indexv = &sortInfo.singleIndex;
	    break;
	default:
	    sortInfo.indexv =
		    TclStackAlloc(interp, sizeof(int) * sortInfo.indexc);
	    allocatedIndexVector = 1;	/* Cannot use indexc field, as it
					 * might be decreased by 1 later. */
	}
	for (j=0 ; j<sortInfo.indexc ; j++) {
	    TclGetIntForIndexM(interp, indexv[j], SORTIDX_END,
		    &sortInfo.indexv[j]);
	}
    }

    listObj = objv[objc-1];

    if (sortInfo.sortMode == SORTMODE_COMMAND) {
	Tcl_Obj *newCommandPtr, *newObjPtr;

	/*
	 * When sorting using a command, we are reentrant and therefore might
	 * have the representation of the list being sorted shimmered out from
	 * underneath our feet. Take a copy (cheap) to prevent this. [Bug
	 * 1675116]
	 */

	listObj = TclListObjCopy(interp, listObj);
	if (listObj == NULL) {
	    sortInfo.resultCode = TCL_ERROR;
	    goto done;
	}

	/*
	 * The existing command is a list. We want to flatten it, append two
	 * dummy arguments on the end, and replace these arguments later.
	 */

	newCommandPtr = Tcl_DuplicateObj(cmdPtr);
	TclNewObj(newObjPtr);
	Tcl_IncrRefCount(newCommandPtr);
	if (Tcl_ListObjAppendElement(interp, newCommandPtr, newObjPtr)
		!= TCL_OK) {
	    TclDecrRefCount(newCommandPtr);
	    TclDecrRefCount(listObj);
	    Tcl_IncrRefCount(newObjPtr);
	    TclDecrRefCount(newObjPtr);
	    sortInfo.resultCode = TCL_ERROR;
	    goto done;
	}
	Tcl_ListObjAppendElement(interp, newCommandPtr, Tcl_NewObj());
	sortInfo.compareCmdPtr = newCommandPtr;
    }

    sortInfo.resultCode = TclListObjGetElements(interp, listObj,
	    &length, &listObjPtrs);
    if (sortInfo.resultCode != TCL_OK || length <= 0) {
	goto done;
    }

    /*
     * Check for sanity when grouping elements of the overall list together
     * because of the -stride option. [TIP #326]
     */

    if (group) {
	if (length % groupSize) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "list size must be a multiple of the stride length",
		    -1));
	    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSORT", "BADSTRIDE",
		    NULL);
	    sortInfo.resultCode = TCL_ERROR;
	    goto done;
	}
	length = length / groupSize;
	if (sortInfo.indexc > 0) {
	    /*
	     * Use the first value in the list supplied to -index as the
	     * offset of the element within each group by which to sort.
	     */

	    groupOffset = sortInfo.indexv[0];
	    if (groupOffset <= SORTIDX_END) {
		groupOffset = (groupOffset - SORTIDX_END) + groupSize - 1;
	    }
	    if (groupOffset < 0 || groupOffset >= groupSize) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"when used with \"-stride\", the leading \"-index\""
			" value must be within the group", -1));
		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSORT",
			"BADINDEX", NULL);
		sortInfo.resultCode = TCL_ERROR;
		goto done;
	    }
	    if (sortInfo.indexc == 1) {
		sortInfo.indexc = 0;
		sortInfo.indexv = NULL;
	    } else {
		sortInfo.indexc--;

		/*
		 * Do not shrink the actual memory block used; that doesn't
		 * work with TclStackAlloc-allocated memory. [Bug 2918962]
		 */

		for (i = 0; i < sortInfo.indexc; i++) {
		    sortInfo.indexv[i] = sortInfo.indexv[i+1];
		}
	    }
	}
    }

    sortInfo.numElements = length;

    indexc = sortInfo.indexc;
    sortMode = sortInfo.sortMode;
    if ((sortMode == SORTMODE_ASCII_NC)
	    || (sortMode == SORTMODE_DICTIONARY)) {
	/*
	 * For this function's purpose all string-based modes are equivalent
	 */

	sortMode = SORTMODE_ASCII;
    }

    /*
     * Initialize the sublists. After the following loop, subList[i] will
     * contain a sorted sublist of length 2**i. Use one extra subList at the
     * end, always at NULL, to indicate the end of the lists.
     */

    for (j=0 ; j<=NUM_LISTS ; j++) {
	subList[j] = NULL;
    }

    /*
     * The following loop creates a SortElement for each list element and
     * begins sorting it into the sublists as it appears.
     */

    elementArray = ckalloc(length * sizeof(SortElement));

    for (i=0; i < length; i++){
	idx = groupSize * i + groupOffset;
	if (indexc) {
	    /*
	     * If this is an indexed sort, retrieve the corresponding element
	     */
	    indexPtr = SelectObjFromSublist(listObjPtrs[idx], &sortInfo);
	    if (sortInfo.resultCode != TCL_OK) {
		goto done;
	    }
	} else {
	    indexPtr = listObjPtrs[idx];
	}

	/*
	 * Determine the "value" of this object for sorting purposes
	 */

	if (sortMode == SORTMODE_ASCII) {
	    elementArray[i].collationKey.strValuePtr = TclGetString(indexPtr);
	} else if (sortMode == SORTMODE_INTEGER) {
	    Tcl_WideInt a;

	    if (TclGetWideIntFromObj(sortInfo.interp, indexPtr, &a) != TCL_OK) {
		sortInfo.resultCode = TCL_ERROR;
		goto done;
	    }
	    elementArray[i].collationKey.wideValue = a;
	} else if (sortMode == SORTMODE_REAL) {
	    double a;

	    if (Tcl_GetDoubleFromObj(sortInfo.interp, indexPtr,
		    &a) != TCL_OK) {
		sortInfo.resultCode = TCL_ERROR;
		goto done;
	    }
	    elementArray[i].collationKey.doubleValue = a;
	} else {
	    elementArray[i].collationKey.objValuePtr = indexPtr;
	}

	/*
	 * Determine the representation of this element in the result: either
	 * the objPtr itself, or its index in the original list.
	 */

	if (indices || group) {
	    elementArray[i].payload.index = idx;
	} else {
	    elementArray[i].payload.objPtr = listObjPtrs[idx];
	}

	/*
	 * Merge this element in the pre-existing sublists (and merge together
	 * sublists when we have two of the same size).
	 */

	elementArray[i].nextPtr = NULL;
	elementPtr = &elementArray[i];
	for (j=0 ; subList[j] ; j++) {
	    elementPtr = MergeLists(subList[j], elementPtr, &sortInfo);
	    subList[j] = NULL;
	}
	if (j >= NUM_LISTS) {
	    j = NUM_LISTS-1;
	}
	subList[j] = elementPtr;
    }

    /*
     * Merge all sublists
     */

    elementPtr = subList[0];
    for (j=1 ; j<NUM_LISTS ; j++) {
	elementPtr = MergeLists(subList[j], elementPtr, &sortInfo);
    }

    /*
     * Now store the sorted elements in the result list.
     */

    if (sortInfo.resultCode == TCL_OK) {
	List *listRepPtr;
	Tcl_Obj **newArray, *objPtr;

	resultPtr = Tcl_NewListObj(sortInfo.numElements * groupSize, NULL);
	listRepPtr = ListRepPtr(resultPtr);
	newArray = &listRepPtr->elements;
	if (group) {
	    for (i=0; elementPtr!=NULL ; elementPtr=elementPtr->nextPtr) {
		idx = elementPtr->payload.index;
		for (j = 0; j < groupSize; j++) {
		    if (indices) {
			objPtr = Tcl_NewIntObj(idx + j - groupOffset);
			newArray[i++] = objPtr;
			Tcl_IncrRefCount(objPtr);
		    } else {
			objPtr = listObjPtrs[idx + j - groupOffset];
			newArray[i++] = objPtr;
			Tcl_IncrRefCount(objPtr);
		    }
		}
	    }
	} else if (indices) {
	    for (i=0; elementPtr != NULL ; elementPtr = elementPtr->nextPtr) {
		objPtr = Tcl_NewIntObj(elementPtr->payload.index);
		newArray[i++] = objPtr;
		Tcl_IncrRefCount(objPtr);
	    }
	} else {
	    for (i=0; elementPtr != NULL ; elementPtr = elementPtr->nextPtr) {
		objPtr = elementPtr->payload.objPtr;
		newArray[i++] = objPtr;
		Tcl_IncrRefCount(objPtr);
	    }
	}
	listRepPtr->elemCount = i;
	Tcl_SetObjResult(interp, resultPtr);
    }

  done:
    if (sortMode == SORTMODE_COMMAND) {
	TclDecrRefCount(sortInfo.compareCmdPtr);
	TclDecrRefCount(listObj);
	sortInfo.compareCmdPtr = NULL;
    }
    if (allocatedIndexVector) {
	TclStackFree(interp, sortInfo.indexv);
    }
    if (elementArray) {
	ckfree(elementArray);
    }
    return sortInfo.resultCode;
}

/*
 *----------------------------------------------------------------------
 *
 * MergeLists -
 *
 *	This procedure combines two sorted lists of SortElement structures
 *	into a single sorted list.
 *
 * Results:
 *	The unified list of SortElement structures.
 *
 * Side effects:
 *	If infoPtr->unique is set then infoPtr->numElements may be updated.
 *	Possibly others, if a user-defined comparison command does something
 *	weird.
 *
 * Note:
 *	If infoPtr->unique is set, the merge assumes that there are no
 *	"repeated" elements in each of the left and right lists. In that case,
 *	if any element of the left list is equivalent to one in the right list
 *	it is omitted from the merged list.
 *
 *	This simplified mechanism works because of the special way our
 *	MergeSort creates the sublists to be merged and will fail to eliminate
 *	all repeats in the general case where they are already present in
 *	either the left or right list. A general code would need to skip
 *	adjacent initial repeats in the left and right lists before comparing
 *	their initial elements, at each step.
 *
 *----------------------------------------------------------------------
 */

static SortElement *
MergeLists(
    SortElement *leftPtr,	/* First list to be merged; may be NULL. */
    SortElement *rightPtr,	/* Second list to be merged; may be NULL. */
    SortInfo *infoPtr)		/* Information needed by the comparison
				 * operator. */
{
    SortElement *headPtr, *tailPtr;
    int cmp;

    if (leftPtr == NULL) {
	return rightPtr;
    }
    if (rightPtr == NULL) {
	return leftPtr;
    }
    cmp = SortCompare(leftPtr, rightPtr, infoPtr);
    if (cmp > 0 || (cmp == 0 && infoPtr->unique)) {
	if (cmp == 0) {
	    infoPtr->numElements--;
	    leftPtr = leftPtr->nextPtr;
	}
	tailPtr = rightPtr;
	rightPtr = rightPtr->nextPtr;
    } else {
	tailPtr = leftPtr;
	leftPtr = leftPtr->nextPtr;
    }
    headPtr = tailPtr;
    if (!infoPtr->unique) {
	while ((leftPtr != NULL) && (rightPtr != NULL)) {
	    cmp = SortCompare(leftPtr, rightPtr, infoPtr);
	    if (cmp > 0) {
		tailPtr->nextPtr = rightPtr;
		tailPtr = rightPtr;
		rightPtr = rightPtr->nextPtr;
	    } else {
		tailPtr->nextPtr = leftPtr;
		tailPtr = leftPtr;
		leftPtr = leftPtr->nextPtr;
	    }
	}
    } else {
	while ((leftPtr != NULL) && (rightPtr != NULL)) {
	    cmp = SortCompare(leftPtr, rightPtr, infoPtr);
	    if (cmp >= 0) {
		if (cmp == 0) {
		    infoPtr->numElements--;
		    leftPtr = leftPtr->nextPtr;
		}
		tailPtr->nextPtr = rightPtr;
		tailPtr = rightPtr;
		rightPtr = rightPtr->nextPtr;
	    } else {
		tailPtr->nextPtr = leftPtr;
		tailPtr = leftPtr;
		leftPtr = leftPtr->nextPtr;
	    }
	}
    }
    if (leftPtr != NULL) {
	tailPtr->nextPtr = leftPtr;
    } else {
	tailPtr->nextPtr = rightPtr;
    }
    return headPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * SortCompare --
 *
 *	This procedure is invoked by MergeLists to determine the proper
 *	ordering between two elements.
 *
 * Results:
 *	A negative results means the the first element comes before the
 *	second, and a positive results means that the second element should
 *	come first. A result of zero means the two elements are equal and it
 *	doesn't matter which comes first.
 *
 * Side effects:
 *	None, unless a user-defined comparison command does something weird.
 *
 *----------------------------------------------------------------------
 */

static int
SortCompare(
    SortElement *elemPtr1, SortElement *elemPtr2,
				/* Values to be compared. */
    SortInfo *infoPtr)		/* Information passed from the top-level
				 * "lsort" command. */
{
    int order = 0;

    if (infoPtr->sortMode == SORTMODE_ASCII) {
	order = strcmp(elemPtr1->collationKey.strValuePtr,
		elemPtr2->collationKey.strValuePtr);
    } else if (infoPtr->sortMode == SORTMODE_ASCII_NC) {
	order = TclUtfCasecmp(elemPtr1->collationKey.strValuePtr,
		elemPtr2->collationKey.strValuePtr);
    } else if (infoPtr->sortMode == SORTMODE_DICTIONARY) {
	order = DictionaryCompare(elemPtr1->collationKey.strValuePtr,
		elemPtr2->collationKey.strValuePtr);
    } else if (infoPtr->sortMode == SORTMODE_INTEGER) {
	Tcl_WideInt a, b;

	a = elemPtr1->collationKey.wideValue;
	b = elemPtr2->collationKey.wideValue;
	order = ((a >= b) - (a <= b));
    } else if (infoPtr->sortMode == SORTMODE_REAL) {
	double a, b;

	a = elemPtr1->collationKey.doubleValue;
	b = elemPtr2->collationKey.doubleValue;
	order = ((a >= b) - (a <= b));
    } else {
	Tcl_Obj **objv, *paramObjv[2];
	int objc;
	Tcl_Obj *objPtr1, *objPtr2;

	if (infoPtr->resultCode != TCL_OK) {
	    /*
	     * Once an error has occurred, skip any future comparisons so as
	     * to preserve the error message in sortInterp->result.
	     */

	    return 0;
	}


	objPtr1 = elemPtr1->collationKey.objValuePtr;
	objPtr2 = elemPtr2->collationKey.objValuePtr;

	paramObjv[0] = objPtr1;
	paramObjv[1] = objPtr2;

	/*
	 * We made space in the command list for the two things to compare.
	 * Replace them and evaluate the result.
	 */

	TclListObjLength(infoPtr->interp, infoPtr->compareCmdPtr, &objc);
	Tcl_ListObjReplace(infoPtr->interp, infoPtr->compareCmdPtr, objc - 2,
		2, 2, paramObjv);
	TclListObjGetElements(infoPtr->interp, infoPtr->compareCmdPtr,
		&objc, &objv);

	infoPtr->resultCode = Tcl_EvalObjv(infoPtr->interp, objc, objv, 0);

	if (infoPtr->resultCode != TCL_OK) {
	    Tcl_AddErrorInfo(infoPtr->interp, "\n    (-compare command)");
	    return 0;
	}

	/*
	 * Parse the result of the command.
	 */

	if (TclGetIntFromObj(infoPtr->interp,
		Tcl_GetObjResult(infoPtr->interp), &order) != TCL_OK) {
	    Tcl_SetObjResult(infoPtr->interp, Tcl_NewStringObj(
		    "-compare command returned non-integer result", -1));
	    Tcl_SetErrorCode(infoPtr->interp, "TCL", "OPERATION", "LSORT",
		    "COMPARISONFAILED", NULL);
	    infoPtr->resultCode = TCL_ERROR;
	    return 0;
	}
    }
    if (!infoPtr->isIncreasing) {
	order = -order;
    }
    return order;
}

/*
 *----------------------------------------------------------------------
 *
 * DictionaryCompare
 *
 *	This function compares two strings as if they were being used in an
 *	index or card catalog. The case of alphabetic characters is ignored,
 *	except to break ties. Thus "B" comes before "b" but after "a". Also,
 *	integers embedded in the strings compare in numerical order. In other
 *	words, "x10y" comes after "x9y", not * before it as it would when
 *	using strcmp().
 *
 * Results:
 *	A negative result means that the first element comes before the
 *	second, and a positive result means that the second element should
 *	come first. A result of zero means the two elements are equal and it
 *	doesn't matter which comes first.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
DictionaryCompare(
    const char *left, const char *right)	/* The strings to compare. */
{
    Tcl_UniChar uniLeft = 0, uniRight = 0, uniLeftLower, uniRightLower;
    int diff, zeros;
    int secondaryDiff = 0;

    while (1) {
	if (isdigit(UCHAR(*right))		/* INTL: digit */
		&& isdigit(UCHAR(*left))) {	/* INTL: digit */
	    /*
	     * There are decimal numbers embedded in the two strings. Compare
	     * them as numbers, rather than strings. If one number has more
	     * leading zeros than the other, the number with more leading
	     * zeros sorts later, but only as a secondary choice.
	     */

	    zeros = 0;
	    while ((*right == '0') && isdigit(UCHAR(right[1]))) {
		right++;
		zeros--;
	    }
	    while ((*left == '0') && isdigit(UCHAR(left[1]))) {
		left++;
		zeros++;
	    }
	    if (secondaryDiff == 0) {
		secondaryDiff = zeros;
	    }

	    /*
	     * The code below compares the numbers in the two strings without
	     * ever converting them to integers. It does this by first
	     * comparing the lengths of the numbers and then comparing the
	     * digit values.
	     */

	    diff = 0;
	    while (1) {
		if (diff == 0) {
		    diff = UCHAR(*left) - UCHAR(*right);
		}
		right++;
		left++;
		if (!isdigit(UCHAR(*right))) {		/* INTL: digit */
		    if (isdigit(UCHAR(*left))) {	/* INTL: digit */
			return 1;
		    } else {
			/*
			 * The two numbers have the same length. See if their
			 * values are different.
			 */

			if (diff != 0) {
			    return diff;
			}
			break;
		    }
		} else if (!isdigit(UCHAR(*left))) {	/* INTL: digit */
		    return -1;
		}
	    }
	    continue;
	}

	/*
	 * Convert character to Unicode for comparison purposes. If either
	 * string is at the terminating null, do a byte-wise comparison and
	 * bail out immediately.
	 */

	if ((*left != '\0') && (*right != '\0')) {
	    left += TclUtfToUniChar(left, &uniLeft);
	    right += TclUtfToUniChar(right, &uniRight);

	    /*
	     * Convert both chars to lower for the comparison, because
	     * dictionary sorts are case insensitve. Covert to lower, not
	     * upper, so chars between Z and a will sort before A (where most
	     * other interesting punctuations occur).
	     */

	    uniLeftLower = Tcl_UniCharToLower(uniLeft);
	    uniRightLower = Tcl_UniCharToLower(uniRight);
	} else {
	    diff = UCHAR(*left) - UCHAR(*right);
	    break;
	}

	diff = uniLeftLower - uniRightLower;
	if (diff) {
	    return diff;
	}
	if (secondaryDiff == 0) {
	    if (Tcl_UniCharIsUpper(uniLeft) && Tcl_UniCharIsLower(uniRight)) {
		secondaryDiff = -1;
	    } else if (Tcl_UniCharIsUpper(uniRight)
		    && Tcl_UniCharIsLower(uniLeft)) {
		secondaryDiff = 1;
	    }
	}
    }
    if (diff == 0) {
	diff = secondaryDiff;
    }
    return diff;
}

/*
 *----------------------------------------------------------------------
 *
 * SelectObjFromSublist --
 *
 *	This procedure is invoked from lsearch and SortCompare. It is used for
 *	implementing the -index option, for the lsort and lsearch commands.
 *
 * Results:
 *	Returns NULL if a failure occurs, and sets the result in the infoPtr.
 *	Otherwise returns the Tcl_Obj* to the item.
 *
 * Side effects:
 *	None.
 *
 * Note:
 *	No reference counting is done, as the result is only used internally
 *	and never passed directly to user code.
 *
 *----------------------------------------------------------------------
 */

static Tcl_Obj *
SelectObjFromSublist(
    Tcl_Obj *objPtr,		/* Obj to select sublist from. */
    SortInfo *infoPtr)		/* Information passed from the top-level
				 * "lsearch" or "lsort" command. */
{
    int i;

    /*
     * Quick check for case when no "-index" option is there.
     */

    if (infoPtr->indexc == 0) {
	return objPtr;
    }

    /*
     * Iterate over the indices, traversing through the nested sublists as we
     * go.
     */

    for (i=0 ; i<infoPtr->indexc ; i++) {
	int listLen, index;
	Tcl_Obj *currentObj;

	if (TclListObjLength(infoPtr->interp, objPtr, &listLen) != TCL_OK) {
	    infoPtr->resultCode = TCL_ERROR;
	    return NULL;
	}
	index = infoPtr->indexv[i];

	/*
	 * Adjust for end-based indexing.
	 */

	if (index < SORTIDX_NONE) {
	    index += listLen + 1;
	}

	if (Tcl_ListObjIndex(infoPtr->interp, objPtr, index,
		&currentObj) != TCL_OK) {
	    infoPtr->resultCode = TCL_ERROR;
	    return NULL;
	}
	if (currentObj == NULL) {
	    Tcl_SetObjResult(infoPtr->interp, Tcl_ObjPrintf(
		    "element %d missing from sublist \"%s\"",
		    index, TclGetString(objPtr)));
	    Tcl_SetErrorCode(infoPtr->interp, "TCL", "OPERATION", "LSORT",
		    "INDEXFAILED", NULL);
	    infoPtr->resultCode = TCL_ERROR;
	    return NULL;
	}
	objPtr = currentObj;
    }
    return objPtr;
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * tab-width: 8
 * End:
 */