summaryrefslogtreecommitdiffstats
path: root/unix/tclUnixFCmd.c
blob: 3c6d3f9543f001b7860b2d2d2c8b688dc1c4505b (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
/*
 * tclUnixFCmd.c
 *
 *	This file implements the unix specific portion of file manipulation
 *	subcommands of the "file" command. All filename arguments should
 *	already be translated to native format.
 *
 * Copyright (c) 1996-1998 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * Portions of this code were derived from NetBSD source code which has the
 * following copyright notice:
 *
 * Copyright (c) 1988, 1993, 1994
 *      The Regents of the University of California. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors may
 *    be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

#include "tclInt.h"
#ifndef HAVE_STRUCT_STAT_ST_BLKSIZE
#ifndef NO_FSTATFS
#include <sys/statfs.h>
#endif
#endif /* !HAVE_STRUCT_STAT_ST_BLKSIZE */
#ifdef HAVE_FTS
#include <fts.h>
#endif

/*
 * The following constants specify the type of callback when
 * TraverseUnixTree() calls the traverseProc()
 */

#define DOTREE_PRED	1	/* pre-order directory */
#define DOTREE_POSTD	2	/* post-order directory */
#define DOTREE_F	3	/* regular file */

/*
 * Fallback temporary file location the temporary file generation code. Can be
 * overridden at compile time for when it is known that temp files can't be
 * written to /tmp (hello, iOS!).
 */

#ifndef TCL_TEMPORARY_FILE_DIRECTORY
#define TCL_TEMPORARY_FILE_DIRECTORY	"/tmp"
#endif

/*
 * Callbacks for file attributes code.
 */

static int		GetGroupAttribute(Tcl_Interp *interp, int objIndex,
			    Tcl_Obj *fileName, Tcl_Obj **attributePtrPtr);
static int		GetOwnerAttribute(Tcl_Interp *interp, int objIndex,
			    Tcl_Obj *fileName, Tcl_Obj **attributePtrPtr);
static int		GetPermissionsAttribute(Tcl_Interp *interp,
			    int objIndex, Tcl_Obj *fileName,
			    Tcl_Obj **attributePtrPtr);
static int		SetGroupAttribute(Tcl_Interp *interp, int objIndex,
			    Tcl_Obj *fileName, Tcl_Obj *attributePtr);
static int		SetOwnerAttribute(Tcl_Interp *interp, int objIndex,
			    Tcl_Obj *fileName, Tcl_Obj *attributePtr);
static int		SetPermissionsAttribute(Tcl_Interp *interp,
			    int objIndex, Tcl_Obj *fileName,
			    Tcl_Obj *attributePtr);
static int		GetModeFromPermString(Tcl_Interp *interp,
			    const char *modeStringPtr, mode_t *modePtr);
#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
static int		GetReadOnlyAttribute(Tcl_Interp *interp, int objIndex,
			    Tcl_Obj *fileName, Tcl_Obj **attributePtrPtr);
static int		SetReadOnlyAttribute(Tcl_Interp *interp, int objIndex,
			    Tcl_Obj *fileName, Tcl_Obj *attributePtr);
#endif

/*
 * Prototype for the TraverseUnixTree callback function.
 */

typedef int (TraversalProc)(Tcl_DString *srcPtr, Tcl_DString *dstPtr,
	const Tcl_StatBuf *statBufPtr, int type, Tcl_DString *errorPtr);

/*
 * Constants and variables necessary for file attributes subcommand.
 *
 * IMPORTANT: The permissions attribute is assumed to be the third item (i.e.
 * to be indexed with '2' in arrays) in code in tclIOUtil.c and possibly
 * elsewhere in Tcl's core.
 */

#ifdef DJGPP

/*
 * See contrib/djgpp/tclDjgppFCmd.c for definition.
 */

extern TclFileAttrProcs tclpFileAttrProcs[];
extern const char *const tclpFileAttrStrings[];

#else /* !DJGPP */
enum {
    UNIX_GROUP_ATTRIBUTE, UNIX_OWNER_ATTRIBUTE, UNIX_PERMISSIONS_ATTRIBUTE,
#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
    UNIX_READONLY_ATTRIBUTE,
#endif
#ifdef MAC_OSX_TCL
    MACOSX_CREATOR_ATTRIBUTE, MACOSX_TYPE_ATTRIBUTE, MACOSX_HIDDEN_ATTRIBUTE,
    MACOSX_RSRCLENGTH_ATTRIBUTE,
#endif
    UNIX_INVALID_ATTRIBUTE /* lint - last enum value needs no trailing , */
};

MODULE_SCOPE const char *const tclpFileAttrStrings[];
const char *const tclpFileAttrStrings[] = {
    "-group", "-owner", "-permissions",
#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
    "-readonly",
#endif
#ifdef MAC_OSX_TCL
    "-creator", "-type", "-hidden", "-rsrclength",
#endif
    NULL
};

MODULE_SCOPE const TclFileAttrProcs tclpFileAttrProcs[];
const TclFileAttrProcs tclpFileAttrProcs[] = {
    {GetGroupAttribute, SetGroupAttribute},
    {GetOwnerAttribute, SetOwnerAttribute},
    {GetPermissionsAttribute, SetPermissionsAttribute},
#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
    {GetReadOnlyAttribute, SetReadOnlyAttribute},
#endif
#ifdef MAC_OSX_TCL
    {TclMacOSXGetFileAttribute,	TclMacOSXSetFileAttribute},
    {TclMacOSXGetFileAttribute,	TclMacOSXSetFileAttribute},
    {TclMacOSXGetFileAttribute,	TclMacOSXSetFileAttribute},
    {TclMacOSXGetFileAttribute,	TclMacOSXSetFileAttribute},
#endif
};
#endif /* DJGPP */

/*
 * This is the maximum number of consecutive readdir/unlink calls that can be
 * made (with no intervening rewinddir or closedir/opendir) before triggering
 * a bug that makes readdir return NULL even though some directory entries
 * have not been processed. The bug afflicts SunOS's readdir when applied to
 * ufs file systems and Darwin 6.5's (and OSX v.10.3.8's) HFS+. JH found the
 * Darwin readdir to reset at 147, so 130 is chosen to be conservative. We
 * can't do a general rewind on failure as NFS can create special files that
 * recreate themselves when you try and delete them. 8.4.8 added a solution
 * that was affected by a single such NFS file, this solution should not be
 * affected by less than THRESHOLD such files. [Bug 1034337]
 */

#define MAX_READDIR_UNLINK_THRESHOLD 130

/*
 * Declarations for local procedures defined in this file:
 */

static int		CopyFileAtts(const char *src,
			    const char *dst, const Tcl_StatBuf *statBufPtr);
static const char *	DefaultTempDir(void);
static int		DoCopyFile(const char *srcPtr, const char *dstPtr,
			    const Tcl_StatBuf *statBufPtr);
static int		DoCreateDirectory(const char *pathPtr);
static int		DoRemoveDirectory(Tcl_DString *pathPtr,
			    int recursive, Tcl_DString *errorPtr);
static int		DoRenameFile(const char *src, const char *dst);
static int		TraversalCopy(Tcl_DString *srcPtr,
			    Tcl_DString *dstPtr,
			    const Tcl_StatBuf *statBufPtr, int type,
			    Tcl_DString *errorPtr);
static int		TraversalDelete(Tcl_DString *srcPtr,
			    Tcl_DString *dstPtr,
			    const Tcl_StatBuf *statBufPtr, int type,
			    Tcl_DString *errorPtr);
static int		TraverseUnixTree(TraversalProc *traversalProc,
			    Tcl_DString *sourcePtr, Tcl_DString *destPtr,
			    Tcl_DString *errorPtr, int doRewind);

#ifdef PURIFY
/*
 * realpath and purify don't mix happily. It has been noted that realpath
 * should not be used with purify because of bogus warnings, but just
 * memset'ing the resolved path will squelch those. This assumes we are
 * passing the standard MAXPATHLEN size resolved arg.
 */

static char *		Realpath(const char *path, char *resolved);

char *
Realpath(
    const char *path,
    char *resolved)
{
    memset(resolved, 0, MAXPATHLEN);
    return realpath(path, resolved);
}
#else
#   define Realpath	realpath
#endif /* PURIFY */

#ifndef NO_REALPATH
#if defined(__APPLE__) && defined(TCL_THREADS) && \
	defined(MAC_OS_X_VERSION_MIN_REQUIRED) && \
	MAC_OS_X_VERSION_MIN_REQUIRED < 1030
/*
 * Prior to Darwin 7, realpath is not thread-safe, c.f. Bug 711232; if we
 * might potentially be running on pre-10.3 OSX, check Darwin release at
 * runtime before using realpath.
 */

MODULE_SCOPE long tclMacOSXDarwinRelease;
#   define haveRealpath	(tclMacOSXDarwinRelease >= 7)
#else
#   define haveRealpath	1
#endif
#endif /* NO_REALPATH */

#ifdef HAVE_FTS
#if defined(HAVE_STRUCT_STAT64) && !defined(__APPLE__)
/* fts doesn't do stat64 */
#   define noFtsStat	1
#elif defined(__APPLE__) && defined(__LP64__) && \
	defined(MAC_OS_X_VERSION_MIN_REQUIRED) && \
	MAC_OS_X_VERSION_MIN_REQUIRED < 1050
/*
 * Prior to Darwin 9, 64bit fts_open() without FTS_NOSTAT may crash (due to a
 * 64bit-unsafe ALIGN macro); if we could be running on pre-10.5 OSX, check
 * Darwin release at runtime and do a separate stat() if necessary.
 */

MODULE_SCOPE long tclMacOSXDarwinRelease;
#   define noFtsStat	(tclMacOSXDarwinRelease < 9)
#else
#   define noFtsStat	0
#endif
#endif /* HAVE_FTS */

/*
 *---------------------------------------------------------------------------
 *
 * TclpObjRenameFile, DoRenameFile --
 *
 *	Changes the name of an existing file or directory, from src to dst. If
 *	src and dst refer to the same file or directory, does nothing and
 *	returns success. Otherwise if dst already exists, it will be deleted
 *	and replaced by src subject to the following conditions:
 *	    If src is a directory, dst may be an empty directory.
 *	    If src is a file, dst may be a file.
 *	In any other situation where dst already exists, the rename will fail.
 *
 * Results:
 *	If the directory was successfully created, returns TCL_OK. Otherwise
 *	the return value is TCL_ERROR and errno is set to indicate the error.
 *	Some possible values for errno are:
 *
 *	EACCES:	    src or dst parent directory can't be read and/or written.
 *	EEXIST:	    dst is a non-empty directory.
 *	EINVAL:	    src is a root directory or dst is a subdirectory of src.
 *	EISDIR:	    dst is a directory, but src is not.
 *	ENOENT:	    src doesn't exist, or src or dst is "".
 *	ENOTDIR:    src is a directory, but dst is not.
 *	EXDEV:	    src and dst are on different filesystems.
 *
 * Side effects:
 *	The implementation of rename may allow cross-filesystem renames, but
 *	the caller should be prepared to emulate it with copy and delete if
 *	errno is EXDEV.
 *
 *---------------------------------------------------------------------------
 */

int
TclpObjRenameFile(
    Tcl_Obj *srcPathPtr,
    Tcl_Obj *destPathPtr)
{
    return DoRenameFile(Tcl_FSGetNativePath(srcPathPtr),
	    Tcl_FSGetNativePath(destPathPtr));
}

static int
DoRenameFile(
    const char *src,		/* Pathname of file or dir to be renamed
				 * (native). */
    const char *dst)		/* New pathname of file or directory
				 * (native). */
{
    if (rename(src, dst) == 0) {			/* INTL: Native. */
	return TCL_OK;
    }
    if (errno == ENOTEMPTY) {
	errno = EEXIST;
    }

    /*
     * IRIX returns EIO when you attept to move a directory into itself. We
     * just map EIO to EINVAL get the right message on SGI. Most platforms
     * don't return EIO except in really strange cases.
     */

    if (errno == EIO) {
	errno = EINVAL;
    }

#ifndef NO_REALPATH
    /*
     * SunOS 4.1.4 reports overwriting a non-empty directory with a directory
     * as EINVAL instead of EEXIST (first rule out the correct EINVAL result
     * code for moving a directory into itself). Must be conditionally
     * compiled because realpath() not defined on all systems.
     */

    if (errno == EINVAL && haveRealpath) {
	char srcPath[MAXPATHLEN], dstPath[MAXPATHLEN];
	DIR *dirPtr;
	Tcl_DirEntry *dirEntPtr;

	if ((Realpath((char *) src, srcPath) != NULL)	/* INTL: Native. */
		&& (Realpath((char *) dst, dstPath) != NULL) /* INTL: Native */
		&& (strncmp(srcPath, dstPath, strlen(srcPath)) != 0)) {
	    dirPtr = opendir(dst);			/* INTL: Native. */
	    if (dirPtr != NULL) {
		while (1) {
		    dirEntPtr = TclOSreaddir(dirPtr);	/* INTL: Native. */
		    if (dirEntPtr == NULL) {
			break;
		    }
		    if ((strcmp(dirEntPtr->d_name, ".") != 0) &&
			    (strcmp(dirEntPtr->d_name, "..") != 0)) {
			errno = EEXIST;
			closedir(dirPtr);
			return TCL_ERROR;
		    }
		}
		closedir(dirPtr);
	    }
	}
	errno = EINVAL;
    }
#endif	/* !NO_REALPATH */

    if (strcmp(src, "/") == 0) {
	/*
	 * Alpha reports renaming / as EBUSY and Linux reports it as EACCES,
	 * instead of EINVAL.
	 */

	errno = EINVAL;
    }

    /*
     * DEC Alpha OSF1 V3.0 returns EACCES when attempting to move a file
     * across filesystems and the parent directory of that file is not
     * writable. Most other systems return EXDEV. Does nothing to correct this
     * behavior.
     */

    return TCL_ERROR;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpObjCopyFile, DoCopyFile --
 *
 *	Copy a single file (not a directory). If dst already exists and is not
 *	a directory, it is removed.
 *
 * Results:
 *	If the file was successfully copied, returns TCL_OK. Otherwise the
 *	return value is TCL_ERROR and errno is set to indicate the error. Some
 *	possible values for errno are:
 *
 *	EACCES:	    src or dst parent directory can't be read and/or written.
 *	EISDIR:	    src or dst is a directory.
 *	ENOENT:	    src doesn't exist. src or dst is "".
 *
 * Side effects:
 *	This procedure will also copy symbolic links, block, and character
 *	devices, and fifos. For symbolic links, the links themselves will be
 *	copied and not what they point to. For the other special file types,
 *	the directory entry will be copied and not the contents of the device
 *	that it refers to.
 *
 *---------------------------------------------------------------------------
 */

int
TclpObjCopyFile(
    Tcl_Obj *srcPathPtr,
    Tcl_Obj *destPathPtr)
{
    const char *src = Tcl_FSGetNativePath(srcPathPtr);
    Tcl_StatBuf srcStatBuf;

    if (TclOSlstat(src, &srcStatBuf) != 0) {		/* INTL: Native. */
	return TCL_ERROR;
    }

    return DoCopyFile(src, Tcl_FSGetNativePath(destPathPtr), &srcStatBuf);
}

static int
DoCopyFile(
    const char *src,		/* Pathname of file to be copied (native). */
    const char *dst,		/* Pathname of file to copy to (native). */
    const Tcl_StatBuf *statBufPtr)
				/* Used to determine filetype. */
{
    Tcl_StatBuf dstStatBuf;

    if (S_ISDIR(statBufPtr->st_mode)) {
	errno = EISDIR;
	return TCL_ERROR;
    }

    /*
     * Symlink, and some of the other calls will fail if the target exists, so
     * we remove it first.
     */

    if (TclOSlstat(dst, &dstStatBuf) == 0) {		/* INTL: Native. */
	if (S_ISDIR(dstStatBuf.st_mode)) {
	    errno = EISDIR;
	    return TCL_ERROR;
	}
    }
    if (unlink(dst) != 0) {				/* INTL: Native. */
	if (errno != ENOENT) {
	    return TCL_ERROR;
	}
    }

    switch ((int) (statBufPtr->st_mode & S_IFMT)) {
#ifndef DJGPP
    case S_IFLNK: {
	char linkBuf[MAXPATHLEN];
	int length;

	length = readlink(src, linkBuf, sizeof(linkBuf));
							/* INTL: Native. */
	if (length == -1) {
	    return TCL_ERROR;
	}
	linkBuf[length] = '\0';
	if (symlink(linkBuf, dst) < 0) {		/* INTL: Native. */
	    return TCL_ERROR;
	}
#ifdef MAC_OSX_TCL
	TclMacOSXCopyFileAttributes(src, dst, statBufPtr);
#endif
	break;
    }
#endif /* !DJGPP */
    case S_IFBLK:
    case S_IFCHR:
	if (mknod(dst, statBufPtr->st_mode,		/* INTL: Native. */
		statBufPtr->st_rdev) < 0) {
	    return TCL_ERROR;
	}
	return CopyFileAtts(src, dst, statBufPtr);
    case S_IFIFO:
	if (mkfifo(dst, statBufPtr->st_mode) < 0) {	/* INTL: Native. */
	    return TCL_ERROR;
	}
	return CopyFileAtts(src, dst, statBufPtr);
    default:
	return TclUnixCopyFile(src, dst, statBufPtr, 0);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclUnixCopyFile -
 *
 *	Helper function for TclpCopyFile. Copies one regular file, using
 *	read() and write().
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	A file is copied. Dst will be overwritten if it exists.
 *
 *----------------------------------------------------------------------
 */

int
TclUnixCopyFile(
    const char *src,		/* Pathname of file to copy (native). */
    const char *dst,		/* Pathname of file to create/overwrite
				 * (native). */
    const Tcl_StatBuf *statBufPtr,
				/* Used to determine mode and blocksize. */
    int dontCopyAtts)		/* If flag set, don't copy attributes. */
{
    int srcFd, dstFd;
    unsigned blockSize;		/* Optimal I/O blocksize for filesystem */
    char *buffer;		/* Data buffer for copy */
    size_t nread;

#ifdef DJGPP
#define BINMODE |O_BINARY
#else
#define BINMODE
#endif /* DJGPP */

#define DEFAULT_COPY_BLOCK_SIZE 4069

    if ((srcFd = TclOSopen(src, O_RDONLY BINMODE, 0)) < 0) { /* INTL: Native */
	return TCL_ERROR;
    }

    dstFd = TclOSopen(dst, O_CREAT|O_TRUNC|O_WRONLY BINMODE, /* INTL: Native */
	    statBufPtr->st_mode);
    if (dstFd < 0) {
	close(srcFd);
	return TCL_ERROR;
    }

    /*
     * Try to work out the best size of buffer to use for copying. If we
     * can't, it's no big deal as we can just use a (32-bit) page, since
     * that's likely to be fairly efficient anyway.
     */

#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
    blockSize = statBufPtr->st_blksize;
#elif !defined(NO_FSTATFS)
    {
	struct statfs fs;

	if (fstatfs(srcFd, &fs) == 0) {
	    blockSize = fs.f_bsize;
	} else {
	    blockSize = DEFAULT_COPY_BLOCK_SIZE;
	}
    }
#else
    blockSize = DEFAULT_COPY_BLOCK_SIZE;
#endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */

    /*
     * [SF Tcl Bug 1586470] Even if we HAVE_STRUCT_STAT_ST_BLKSIZE, there are
     * filesystems which report a bogus value for the blocksize. An example
     * is the Andrew Filesystem (afs), reporting a blocksize of 0. When
     * detecting such a situation we now simply fall back to a hardwired
     * default size.
     */

    if (blockSize <= 0) {
	blockSize = DEFAULT_COPY_BLOCK_SIZE;
    }
    buffer = ckalloc(blockSize);
    while (1) {
	nread = (size_t) read(srcFd, buffer, blockSize);
	if ((nread == (size_t) -1) || (nread == 0)) {
	    break;
	}
	if ((size_t) write(dstFd, buffer, nread) != nread) {
	    nread = (size_t) -1;
	    break;
	}
    }

    ckfree(buffer);
    close(srcFd);
    if ((close(dstFd) != 0) || (nread == (size_t) -1)) {
	unlink(dst);					/* INTL: Native. */
	return TCL_ERROR;
    }
    if (!dontCopyAtts && CopyFileAtts(src, dst, statBufPtr) == TCL_ERROR) {
	/*
	 * The copy succeeded, but setting the permissions failed, so be in a
	 * consistent state, we remove the file that was created by the copy.
	 */

	unlink(dst);					/* INTL: Native. */
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpObjDeleteFile, TclpDeleteFile --
 *
 *	Removes a single file (not a directory).
 *
 * Results:
 *	If the file was successfully deleted, returns TCL_OK. Otherwise the
 *	return value is TCL_ERROR and errno is set to indicate the error. Some
 *	possible values for errno are:
 *
 *	EACCES:	    a parent directory can't be read and/or written.
 *	EISDIR:	    path is a directory.
 *	ENOENT:	    path doesn't exist or is "".
 *
 * Side effects:
 *	The file is deleted, even if it is read-only.
 *
 *---------------------------------------------------------------------------
 */

int
TclpObjDeleteFile(
    Tcl_Obj *pathPtr)
{
    return TclpDeleteFile(Tcl_FSGetNativePath(pathPtr));
}

int
TclpDeleteFile(
    const void *path)		/* Pathname of file to be removed (native). */
{
    if (unlink((const char *)path) != 0) {
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpCreateDirectory, DoCreateDirectory --
 *
 *	Creates the specified directory. All parent directories of the
 *	specified directory must already exist. The directory is automatically
 *	created with permissions so that user can access the new directory and
 *	create new files or subdirectories in it.
 *
 * Results:
 *	If the directory was successfully created, returns TCL_OK. Otherwise
 *	the return value is TCL_ERROR and errno is set to indicate the error.
 *	Some possible values for errno are:
 *
 *	EACCES:	    a parent directory can't be read and/or written.
 *	EEXIST:	    path already exists.
 *	ENOENT:	    a parent directory doesn't exist.
 *
 * Side effects:
 *	A directory is created with the current umask, except that permission
 *	for u+rwx will always be added.
 *
 *---------------------------------------------------------------------------
 */

int
TclpObjCreateDirectory(
    Tcl_Obj *pathPtr)
{
    return DoCreateDirectory(Tcl_FSGetNativePath(pathPtr));
}

static int
DoCreateDirectory(
    const char *path)		/* Pathname of directory to create (native). */
{
    mode_t mode;

    mode = umask(0);
    umask(mode);

    /*
     * umask return value is actually the inverse of the permissions.
     */

    mode = (0777 & ~mode) | S_IRUSR | S_IWUSR | S_IXUSR;

    if (mkdir(path, mode) != 0) {			/* INTL: Native. */
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpObjCopyDirectory --
 *
 *	Recursively copies a directory. The target directory dst must not
 *	already exist. Note that this function does not merge two directory
 *	hierarchies, even if the target directory is an an empty directory.
 *
 * Results:
 *	If the directory was successfully copied, returns TCL_OK. Otherwise
 *	the return value is TCL_ERROR, errno is set to indicate the error, and
 *	the pathname of the file that caused the error is stored in errorPtr.
 *	See TclpObjCreateDirectory and TclpObjCopyFile for a description of
 *	possible values for errno.
 *
 * Side effects:
 *	An exact copy of the directory hierarchy src will be created with the
 *	name dst. If an error occurs, the error will be returned immediately,
 *	and remaining files will not be processed.
 *
 *---------------------------------------------------------------------------
 */

int
TclpObjCopyDirectory(
    Tcl_Obj *srcPathPtr,
    Tcl_Obj *destPathPtr,
    Tcl_Obj **errorPtr)
{
    Tcl_DString ds;
    Tcl_DString srcString, dstString;
    int ret;
    Tcl_Obj *transPtr;

    transPtr = Tcl_FSGetTranslatedPath(NULL,srcPathPtr);
    Tcl_UtfToExternalDString(NULL,
	    (transPtr != NULL ? TclGetString(transPtr) : NULL),
	    -1, &srcString);
    if (transPtr != NULL) {
	Tcl_DecrRefCount(transPtr);
    }
    transPtr = Tcl_FSGetTranslatedPath(NULL,destPathPtr);
    Tcl_UtfToExternalDString(NULL,
	    (transPtr != NULL ? TclGetString(transPtr) : NULL),
	    -1, &dstString);
    if (transPtr != NULL) {
	Tcl_DecrRefCount(transPtr);
    }

    ret = TraverseUnixTree(TraversalCopy, &srcString, &dstString, &ds, 0);

    Tcl_DStringFree(&srcString);
    Tcl_DStringFree(&dstString);

    if (ret != TCL_OK) {
	*errorPtr = Tcl_NewStringObj(Tcl_DStringValue(&ds), -1);
	Tcl_DStringFree(&ds);
	Tcl_IncrRefCount(*errorPtr);
    }
    return ret;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpRemoveDirectory, DoRemoveDirectory --
 *
 *	Removes directory (and its contents, if the recursive flag is set).
 *
 * Results:
 *	If the directory was successfully removed, returns TCL_OK. Otherwise
 *	the return value is TCL_ERROR, errno is set to indicate the error, and
 *	the pathname of the file that caused the error is stored in errorPtr.
 *	Some possible values for errno are:
 *
 *	EACCES:	    path directory can't be read and/or written.
 *	EEXIST:	    path is a non-empty directory.
 *	EINVAL:	    path is a root directory.
 *	ENOENT:	    path doesn't exist or is "".
 * 	ENOTDIR:    path is not a directory.
 *
 * Side effects:
 *	Directory removed. If an error occurs, the error will be returned
 *	immediately, and remaining files will not be deleted.
 *
 *---------------------------------------------------------------------------
 */

int
TclpObjRemoveDirectory(
    Tcl_Obj *pathPtr,
    int recursive,
    Tcl_Obj **errorPtr)
{
    Tcl_DString ds;
    Tcl_DString pathString;
    int ret;
    Tcl_Obj *transPtr = Tcl_FSGetTranslatedPath(NULL, pathPtr);

    Tcl_UtfToExternalDString(NULL,
	    (transPtr != NULL ? TclGetString(transPtr) : NULL),
	    -1, &pathString);
    if (transPtr != NULL) {
	Tcl_DecrRefCount(transPtr);
    }
    ret = DoRemoveDirectory(&pathString, recursive, &ds);
    Tcl_DStringFree(&pathString);

    if (ret != TCL_OK) {
	*errorPtr = Tcl_NewStringObj(Tcl_DStringValue(&ds), -1);
	Tcl_DStringFree(&ds);
	Tcl_IncrRefCount(*errorPtr);
    }
    return ret;
}

static int
DoRemoveDirectory(
    Tcl_DString *pathPtr,	/* Pathname of directory to be removed
				 * (native). */
    int recursive,		/* If non-zero, removes directories that are
				 * nonempty. Otherwise, will only remove empty
				 * directories. */
    Tcl_DString *errorPtr)	/* If non-NULL, uninitialized or free DString
				 * filled with UTF-8 name of file causing
				 * error. */
{
    const char *path;
    mode_t oldPerm = 0;
    int result;

    path = Tcl_DStringValue(pathPtr);

    if (recursive != 0) {
	/*
	 * We should try to change permissions so this can be deleted.
	 */

	Tcl_StatBuf statBuf;
	int newPerm;

	if (TclOSstat(path, &statBuf) == 0) {
	    oldPerm = (mode_t) (statBuf.st_mode & 0x00007FFF);
	}

	newPerm = oldPerm | (64+128+256);
	chmod(path, (mode_t) newPerm);
    }

    if (rmdir(path) == 0) {				/* INTL: Native. */
	return TCL_OK;
    }
    if (errno == ENOTEMPTY) {
	errno = EEXIST;
    }

    result = TCL_OK;
    if ((errno != EEXIST) || (recursive == 0)) {
	if (errorPtr != NULL) {
	    Tcl_ExternalToUtfDString(NULL, path, -1, errorPtr);
	}
	result = TCL_ERROR;
    }

    /*
     * The directory is nonempty, but the recursive flag has been specified,
     * so we recursively remove all the files in the directory.
     */

    if (result == TCL_OK) {
	result = TraverseUnixTree(TraversalDelete, pathPtr, NULL, errorPtr, 1);
    }

    if ((result != TCL_OK) && (recursive != 0)) {
	/*
	 * Try to restore permissions.
	 */

	chmod(path, oldPerm);
    }
    return result;
}

/*
 *---------------------------------------------------------------------------
 *
 * TraverseUnixTree --
 *
 *	Traverse directory tree specified by sourcePtr, calling the function
 *	traverseProc for each file and directory encountered. If destPtr is
 *	non-null, each of name in the sourcePtr directory is appended to the
 *	directory specified by destPtr and passed as the second argument to
 *	traverseProc().
 *
 * Results:
 *	Standard Tcl result.
 *
 * Side effects:
 *	None caused by TraverseUnixTree, however the user specified
 *	traverseProc() may change state. If an error occurs, the error will be
 *	returned immediately, and remaining files will not be processed.
 *
 *---------------------------------------------------------------------------
 */

static int
TraverseUnixTree(
    TraversalProc *traverseProc,/* Function to call for every file and
				 * directory in source hierarchy. */
    Tcl_DString *sourcePtr,	/* Pathname of source directory to be
				 * traversed (native). */
    Tcl_DString *targetPtr,	/* Pathname of directory to traverse in
				 * parallel with source directory (native). */
    Tcl_DString *errorPtr,	/* If non-NULL, uninitialized or free DString
				 * filled with UTF-8 name of file causing
				 * error. */
    int doRewind)		/* Flag indicating that to ensure complete
    				 * traversal of source hierarchy, the readdir
    				 * loop should be rewound whenever
    				 * traverseProc has returned TCL_OK; this is
    				 * required when traverseProc modifies the
    				 * source hierarchy, e.g. by deleting
    				 * files. */
{
    Tcl_StatBuf statBuf;
    const char *source, *errfile;
    int result, sourceLen;
    int targetLen;
#ifndef HAVE_FTS
    int numProcessed = 0;
    Tcl_DirEntry *dirEntPtr;
    DIR *dirPtr;
#else
    const char *paths[2] = {NULL, NULL};
    FTS *fts = NULL;
    FTSENT *ent;
#endif

    errfile = NULL;
    result = TCL_OK;
    targetLen = 0;		/* lint. */

    source = Tcl_DStringValue(sourcePtr);
    if (TclOSlstat(source, &statBuf) != 0) {		/* INTL: Native. */
	errfile = source;
	goto end;
    }
    if (!S_ISDIR(statBuf.st_mode)) {
	/*
	 * Process the regular file
	 */

	return traverseProc(sourcePtr, targetPtr, &statBuf, DOTREE_F,
		errorPtr);
    }
#ifndef HAVE_FTS
    dirPtr = opendir(source);				/* INTL: Native. */
    if (dirPtr == NULL) {
	/*
	 * Can't read directory
	 */

	errfile = source;
	goto end;
    }
    result = traverseProc(sourcePtr, targetPtr, &statBuf, DOTREE_PRED,
	    errorPtr);
    if (result != TCL_OK) {
	closedir(dirPtr);
	return result;
    }

    TclDStringAppendLiteral(sourcePtr, "/");
    sourceLen = Tcl_DStringLength(sourcePtr);

    if (targetPtr != NULL) {
	TclDStringAppendLiteral(targetPtr, "/");
	targetLen = Tcl_DStringLength(targetPtr);
    }

    while ((dirEntPtr = TclOSreaddir(dirPtr)) != NULL) { /* INTL: Native. */
	if ((dirEntPtr->d_name[0] == '.')
		&& ((dirEntPtr->d_name[1] == '\0')
			|| (strcmp(dirEntPtr->d_name, "..") == 0))) {
	    continue;
	}

	/*
	 * Append name after slash, and recurse on the file.
	 */

	Tcl_DStringAppend(sourcePtr, dirEntPtr->d_name, -1);
	if (targetPtr != NULL) {
	    Tcl_DStringAppend(targetPtr, dirEntPtr->d_name, -1);
	}
	result = TraverseUnixTree(traverseProc, sourcePtr, targetPtr,
		errorPtr, doRewind);
	if (result != TCL_OK) {
	    break;
	} else {
	    numProcessed++;
	}

	/*
	 * Remove name after slash.
	 */

	Tcl_DStringSetLength(sourcePtr, sourceLen);
	if (targetPtr != NULL) {
	    Tcl_DStringSetLength(targetPtr, targetLen);
	}
	if (doRewind && (numProcessed > MAX_READDIR_UNLINK_THRESHOLD)) {
	    /*
	     * Call rewinddir if we've called unlink or rmdir so many times
	     * (since the opendir or the previous rewinddir), to avoid a
	     * NULL-return that may a symptom of a buggy readdir.
	     */

	    rewinddir(dirPtr);
	    numProcessed = 0;
	}
    }
    closedir(dirPtr);

    /*
     * Strip off the trailing slash we added
     */

    Tcl_DStringSetLength(sourcePtr, sourceLen - 1);
    if (targetPtr != NULL) {
	Tcl_DStringSetLength(targetPtr, targetLen - 1);
    }

    if (result == TCL_OK) {
	/*
	 * Call traverseProc() on a directory after visiting all the files in
	 * that directory.
	 */

	result = traverseProc(sourcePtr, targetPtr, &statBuf, DOTREE_POSTD,
		errorPtr);
    }
#else /* HAVE_FTS */
    paths[0] = source;
    fts = fts_open((char **) paths, FTS_PHYSICAL | FTS_NOCHDIR |
	    (noFtsStat || doRewind ? FTS_NOSTAT : 0), NULL);
    if (fts == NULL) {
	errfile = source;
	goto end;
    }

    sourceLen = Tcl_DStringLength(sourcePtr);
    if (targetPtr != NULL) {
	targetLen = Tcl_DStringLength(targetPtr);
    }

    while ((ent = fts_read(fts)) != NULL) {
	unsigned short info = ent->fts_info;
	char *path = ent->fts_path + sourceLen;
	unsigned short pathlen = ent->fts_pathlen - sourceLen;
	int type;
	Tcl_StatBuf *statBufPtr = NULL;

	if (info == FTS_DNR || info == FTS_ERR || info == FTS_NS) {
	    errfile = ent->fts_path;
	    break;
	}
	Tcl_DStringAppend(sourcePtr, path, pathlen);
	if (targetPtr != NULL) {
	    Tcl_DStringAppend(targetPtr, path, pathlen);
	}
	switch (info) {
	case FTS_D:
	    type = DOTREE_PRED;
	    break;
	case FTS_DP:
	    type = DOTREE_POSTD;
	    break;
	default:
	    type = DOTREE_F;
	    break;
	}
	if (!doRewind) { /* no need to stat for delete */
	    if (noFtsStat) {
		statBufPtr = &statBuf;
		if (TclOSlstat(ent->fts_path, statBufPtr) != 0) {
		    errfile = ent->fts_path;
		    break;
		}
	    } else {
		statBufPtr = (Tcl_StatBuf *) ent->fts_statp;
	    }
	}
	result = traverseProc(sourcePtr, targetPtr, statBufPtr, type,
		errorPtr);
	if (result != TCL_OK) {
	    break;
	}
	Tcl_DStringSetLength(sourcePtr, sourceLen);
	if (targetPtr != NULL) {
	    Tcl_DStringSetLength(targetPtr, targetLen);
	}
    }
#endif /* !HAVE_FTS */

  end:
    if (errfile != NULL) {
	if (errorPtr != NULL) {
	    Tcl_ExternalToUtfDString(NULL, errfile, -1, errorPtr);
	}
	result = TCL_ERROR;
    }
#ifdef HAVE_FTS
    if (fts != NULL) {
	fts_close(fts);
    }
#endif

    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * TraversalCopy
 *
 *	Called from TraverseUnixTree in order to execute a recursive copy of a
 *	directory.
 *
 * Results:
 *	Standard Tcl result.
 *
 * Side effects:
 *	The file or directory src may be copied to dst, depending on the value
 *	of type.
 *
 *----------------------------------------------------------------------
 */

static int
TraversalCopy(
    Tcl_DString *srcPtr,	/* Source pathname to copy (native). */
    Tcl_DString *dstPtr,	/* Destination pathname of copy (native). */
    const Tcl_StatBuf *statBufPtr,
				/* Stat info for file specified by srcPtr. */
    int type,			/* Reason for call - see TraverseUnixTree(). */
    Tcl_DString *errorPtr)	/* If non-NULL, uninitialized or free DString
				 * filled with UTF-8 name of file causing
				 * error. */
{
    switch (type) {
    case DOTREE_F:
	if (DoCopyFile(Tcl_DStringValue(srcPtr), Tcl_DStringValue(dstPtr),
		statBufPtr) == TCL_OK) {
	    return TCL_OK;
	}
	break;

    case DOTREE_PRED:
	if (DoCreateDirectory(Tcl_DStringValue(dstPtr)) == TCL_OK) {
	    return TCL_OK;
	}
	break;

    case DOTREE_POSTD:
	if (CopyFileAtts(Tcl_DStringValue(srcPtr),
		Tcl_DStringValue(dstPtr), statBufPtr) == TCL_OK) {
	    return TCL_OK;
	}
	break;
    }

    /*
     * There shouldn't be a problem with src, because we already checked it to
     * get here.
     */

    if (errorPtr != NULL) {
	Tcl_ExternalToUtfDString(NULL, Tcl_DStringValue(dstPtr),
		Tcl_DStringLength(dstPtr), errorPtr);
    }
    return TCL_ERROR;
}

/*
 *---------------------------------------------------------------------------
 *
 * TraversalDelete --
 *
 *	Called by procedure TraverseUnixTree for every file and directory that
 *	it encounters in a directory hierarchy. This procedure unlinks files,
 *	and removes directories after all the containing files have been
 *	processed.
 *
 * Results:
 *	Standard Tcl result.
 *
 * Side effects:
 *	Files or directory specified by src will be deleted.
 *
 *----------------------------------------------------------------------
 */

static int
TraversalDelete(
    Tcl_DString *srcPtr,	/* Source pathname (native). */
    Tcl_DString *ignore,	/* Destination pathname (not used). */
    const Tcl_StatBuf *statBufPtr,
				/* Stat info for file specified by srcPtr. */
    int type,			/* Reason for call - see TraverseUnixTree(). */
    Tcl_DString *errorPtr)	/* If non-NULL, uninitialized or free DString
				 * filled with UTF-8 name of file causing
				 * error. */
{
    switch (type) {
    case DOTREE_F:
	if (TclpDeleteFile(Tcl_DStringValue(srcPtr)) == 0) {
	    return TCL_OK;
	}
	break;
    case DOTREE_PRED:
	return TCL_OK;
    case DOTREE_POSTD:
	if (DoRemoveDirectory(srcPtr, 0, NULL) == 0) {
	    return TCL_OK;
	}
	break;
    }
    if (errorPtr != NULL) {
	Tcl_ExternalToUtfDString(NULL, Tcl_DStringValue(srcPtr),
		Tcl_DStringLength(srcPtr), errorPtr);
    }
    return TCL_ERROR;
}

/*
 *---------------------------------------------------------------------------
 *
 * CopyFileAtts --
 *
 *	Copy the file attributes such as owner, group, permissions, and
 *	modification date from one file to another.
 *
 * Results:
 *	Standard Tcl result.
 *
 * Side effects:
 *	User id, group id, permission bits, last modification time, and last
 *	access time are updated in the new file to reflect the old file.
 *
 *---------------------------------------------------------------------------
 */

static int
CopyFileAtts(
    const char *src,		/* Path name of source file (native). */
    const char *dst,		/* Path name of target file (native). */
    const Tcl_StatBuf *statBufPtr)
				/* Stat info for source file */
{
    struct utimbuf tval;
    mode_t newMode;

    newMode = statBufPtr->st_mode
	    & (S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO);

    /*
     * Note that if you copy a setuid file that is owned by someone else, and
     * you are not root, then the copy will be setuid to you. The most correct
     * implementation would probably be to have the copy not setuid to anyone
     * if the original file was owned by someone else, but this corner case
     * isn't currently handled. It would require another lstat(), or getuid().
     */

    if (chmod(dst, newMode)) {				/* INTL: Native. */
	newMode &= ~(S_ISUID | S_ISGID);
	if (chmod(dst, newMode)) {			/* INTL: Native. */
	    return TCL_ERROR;
	}
    }

    tval.actime = statBufPtr->st_atime;
    tval.modtime = statBufPtr->st_mtime;

    if (utime(dst, &tval)) {				/* INTL: Native. */
	return TCL_ERROR;
    }
#ifdef MAC_OSX_TCL
    TclMacOSXCopyFileAttributes(src, dst, statBufPtr);
#endif
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * GetGroupAttribute
 *
 *	Gets the group attribute of a file.
 *
 * Results:
 *	Standard TCL result. Returns a new Tcl_Obj in attributePtrPtr if there
 *	is no error.
 *
 * Side effects:
 *	A new object is allocated.
 *
 *----------------------------------------------------------------------
 */

static int
GetGroupAttribute(
    Tcl_Interp *interp,		/* The interp we are using for errors. */
    int objIndex,		/* The index of the attribute. */
    Tcl_Obj *fileName,		/* The name of the file (UTF-8). */
    Tcl_Obj **attributePtrPtr)	/* A pointer to return the object with. */
{
    Tcl_StatBuf statBuf;
    struct group *groupPtr;
    int result;

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not read \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));
	}
	return TCL_ERROR;
    }

    groupPtr = TclpGetGrGid(statBuf.st_gid);

    if (groupPtr == NULL) {
	*attributePtrPtr = Tcl_NewLongObj((long) statBuf.st_gid);
    } else {
	Tcl_DString ds;
	const char *utf;

	utf = Tcl_ExternalToUtfDString(NULL, groupPtr->gr_name, -1, &ds);
	*attributePtrPtr = Tcl_NewStringObj(utf, -1);
	Tcl_DStringFree(&ds);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * GetOwnerAttribute
 *
 *	Gets the owner attribute of a file.
 *
 * Results:
 *	Standard TCL result. Returns a new Tcl_Obj in attributePtrPtr if there
 *	is no error.
 *
 * Side effects:
 *	A new object is allocated.
 *
 *----------------------------------------------------------------------
 */

static int
GetOwnerAttribute(
    Tcl_Interp *interp,		/* The interp we are using for errors. */
    int objIndex,		/* The index of the attribute. */
    Tcl_Obj *fileName,		/* The name of the file (UTF-8). */
    Tcl_Obj **attributePtrPtr)	/* A pointer to return the object with. */
{
    Tcl_StatBuf statBuf;
    struct passwd *pwPtr;
    int result;

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not read \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));
	}
	return TCL_ERROR;
    }

    pwPtr = TclpGetPwUid(statBuf.st_uid);

    if (pwPtr == NULL) {
	*attributePtrPtr = Tcl_NewLongObj((long) statBuf.st_uid);
    } else {
	Tcl_DString ds;

	(void) Tcl_ExternalToUtfDString(NULL, pwPtr->pw_name, -1, &ds);
	*attributePtrPtr = TclDStringToObj(&ds);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * GetPermissionsAttribute
 *
 *	Gets the group attribute of a file.
 *
 * Results:
 *	Standard TCL result. Returns a new Tcl_Obj in attributePtrPtr if there
 *	is no error. The object will have ref count 0.
 *
 * Side effects:
 *	A new object is allocated.
 *
 *----------------------------------------------------------------------
 */

static int
GetPermissionsAttribute(
    Tcl_Interp *interp,		    /* The interp we are using for errors. */
    int objIndex,		    /* The index of the attribute. */
    Tcl_Obj *fileName,		    /* The name of the file (UTF-8). */
    Tcl_Obj **attributePtrPtr)	    /* A pointer to return the object with. */
{
    Tcl_StatBuf statBuf;
    int result;

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not read \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));
	}
	return TCL_ERROR;
    }

    *attributePtrPtr = Tcl_ObjPrintf(
	    "%0#5lo", (long) (statBuf.st_mode & 0x00007FFF));
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * SetGroupAttribute --
 *
 *	Sets the group of the file to the specified group.
 *
 * Results:
 *	Standard TCL result.
 *
 * Side effects:
 *	As above.
 *
 *---------------------------------------------------------------------------
 */

static int
SetGroupAttribute(
    Tcl_Interp *interp,		/* The interp for error reporting. */
    int objIndex,		/* The index of the attribute. */
    Tcl_Obj *fileName,		/* The name of the file (UTF-8). */
    Tcl_Obj *attributePtr)	/* New group for file. */
{
    long gid;
    int result;
    const char *native;

    if (Tcl_GetLongFromObj(NULL, attributePtr, &gid) != TCL_OK) {
	Tcl_DString ds;
	struct group *groupPtr = NULL;
	const char *string;
	int length;

	string = Tcl_GetStringFromObj(attributePtr, &length);

	native = Tcl_UtfToExternalDString(NULL, string, length, &ds);
	groupPtr = TclpGetGrNam(native); /* INTL: Native. */
	Tcl_DStringFree(&ds);

	if (groupPtr == NULL) {
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"could not set group for file \"%s\":"
			" group \"%s\" does not exist",
			TclGetString(fileName), string));
		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "SETGRP",
			"NO_GROUP", NULL);
	    }
	    return TCL_ERROR;
	}
	gid = groupPtr->gr_gid;
    }

    native = Tcl_FSGetNativePath(fileName);
    result = chown(native, (uid_t) -1, (gid_t) gid);	/* INTL: Native. */

    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not set group for file \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));
	}
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * SetOwnerAttribute --
 *
 *	Sets the owner of the file to the specified owner.
 *
 * Results:
 *	Standard TCL result.
 *
 * Side effects:
 *	As above.
 *
 *---------------------------------------------------------------------------
 */

static int
SetOwnerAttribute(
    Tcl_Interp *interp,		/* The interp for error reporting. */
    int objIndex,		/* The index of the attribute. */
    Tcl_Obj *fileName,		/* The name of the file (UTF-8). */
    Tcl_Obj *attributePtr)	/* New owner for file. */
{
    long uid;
    int result;
    const char *native;

    if (Tcl_GetLongFromObj(NULL, attributePtr, &uid) != TCL_OK) {
	Tcl_DString ds;
	struct passwd *pwPtr = NULL;
	const char *string;
	int length;

	string = Tcl_GetStringFromObj(attributePtr, &length);

	native = Tcl_UtfToExternalDString(NULL, string, length, &ds);
	pwPtr = TclpGetPwNam(native);			/* INTL: Native. */
	Tcl_DStringFree(&ds);

	if (pwPtr == NULL) {
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"could not set owner for file \"%s\":"
			" user \"%s\" does not exist",
			TclGetString(fileName), string));
		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "SETOWN",
			"NO_USER", NULL);
	    }
	    return TCL_ERROR;
	}
	uid = pwPtr->pw_uid;
    }

    native = Tcl_FSGetNativePath(fileName);
    result = chown(native, (uid_t) uid, (gid_t) -1);	/* INTL: Native. */

    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not set owner for file \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));
	}
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * SetPermissionsAttribute
 *
 *	Sets the file to the given permission.
 *
 * Results:
 *	Standard TCL result.
 *
 * Side effects:
 *	The permission of the file is changed.
 *
 *---------------------------------------------------------------------------
 */

static int
SetPermissionsAttribute(
    Tcl_Interp *interp,		/* The interp we are using for errors. */
    int objIndex,		/* The index of the attribute. */
    Tcl_Obj *fileName,		/* The name of the file (UTF-8). */
    Tcl_Obj *attributePtr)	/* The attribute to set. */
{
    long mode;
    mode_t newMode;
    int result = TCL_ERROR;
    const char *native;
    const char *modeStringPtr = TclGetString(attributePtr);
    int scanned = TclParseAllWhiteSpace(modeStringPtr, -1);

    /*
     * First supply support for octal number format
     */

    if ((modeStringPtr[scanned] == '0')
	    && (modeStringPtr[scanned+1] >= '0')
	    && (modeStringPtr[scanned+1] <= '7')) {
	/* Leading zero - attempt octal interpretation */
	Tcl_Obj *modeObj;

	TclNewLiteralStringObj(modeObj, "0o");
	Tcl_AppendToObj(modeObj, modeStringPtr+scanned+1, -1);
	result = Tcl_GetLongFromObj(NULL, modeObj, &mode);
	Tcl_DecrRefCount(modeObj);
    }
    if (result == TCL_OK
	    || Tcl_GetLongFromObj(NULL, attributePtr, &mode) == TCL_OK) {
	newMode = (mode_t) (mode & 0x00007FFF);
    } else {
	Tcl_StatBuf buf;

	/*
	 * Try the forms "rwxrwxrwx" and "ugo=rwx"
	 *
	 * We get the current mode of the file, in order to allow for ug+-=rwx
	 * style chmod strings.
	 */

	result = TclpObjStat(fileName, &buf);
	if (result != 0) {
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"could not read \"%s\": %s",
			TclGetString(fileName), Tcl_PosixError(interp)));
	    }
	    return TCL_ERROR;
	}
	newMode = (mode_t) (buf.st_mode & 0x00007FFF);

	if (GetModeFromPermString(NULL, modeStringPtr, &newMode) != TCL_OK) {
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"unknown permission string format \"%s\"",
			modeStringPtr));
		Tcl_SetErrorCode(interp, "TCL", "VALUE", "PERMISSION", NULL);
	    }
	    return TCL_ERROR;
	}
    }

    native = Tcl_FSGetNativePath(fileName);
    result = chmod(native, newMode);		/* INTL: Native. */
    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not set permissions for file \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));
	}
	return TCL_ERROR;
    }
    return TCL_OK;
}

#ifndef DJGPP
/*
 *---------------------------------------------------------------------------
 *
 * TclpObjListVolumes --
 *
 *	Lists the currently mounted volumes, which on UNIX is just /.
 *
 * Results:
 *	The list of volumes.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

Tcl_Obj *
TclpObjListVolumes(void)
{
    Tcl_Obj *resultPtr;
    TclNewLiteralStringObj(resultPtr, "/");

    Tcl_IncrRefCount(resultPtr);
    return resultPtr;
}
#endif

/*
 *----------------------------------------------------------------------
 *
 * GetModeFromPermString --
 *
 *	This procedure is invoked to process the "file permissions" Tcl
 *	command, to check for a "rwxrwxrwx" or "ugoa+-=rwxst" string. See the
 *	user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
GetModeFromPermString(
    Tcl_Interp *interp,		/* The interp we are using for errors. */
    const char *modeStringPtr, /* Permissions string */
    mode_t *modePtr)		/* pointer to the mode value */
{
    mode_t newMode;
    mode_t oldMode;		/* Storage for the value of the old mode (that
				 * is passed in), to allow for the chmod style
				 * manipulation. */
    int i,n, who, op, what, op_found, who_found;

    /*
     * We start off checking for an "rwxrwxrwx" style permissions string
     */

    if (strlen(modeStringPtr) != 9) {
	goto chmodStyleCheck;
    }

    newMode = 0;
    for (i = 0; i < 9; i++) {
	switch (*(modeStringPtr+i)) {
	case 'r':
	    if ((i%3) != 0) {
		goto chmodStyleCheck;
	    }
	    newMode |= (1<<(8-i));
	    break;
	case 'w':
	    if ((i%3) != 1) {
		goto chmodStyleCheck;
	    }
	    newMode |= (1<<(8-i));
	    break;
	case 'x':
	    if ((i%3) != 2) {
		goto chmodStyleCheck;
	    }
	    newMode |= (1<<(8-i));
	    break;
	case 's':
	    if (((i%3) != 2) || (i > 5)) {
		goto chmodStyleCheck;
	    }
	    newMode |= (1<<(8-i));
	    newMode |= (1<<(11-(i/3)));
	    break;
	case 'S':
	    if (((i%3) != 2) || (i > 5)) {
		goto chmodStyleCheck;
	    }
	    newMode |= (1<<(11-(i/3)));
	    break;
	case 't':
	    if (i != 8) {
		goto chmodStyleCheck;
	    }
	    newMode |= (1<<(8-i));
	    newMode |= (1<<9);
	    break;
	case 'T':
	    if (i != 8) {
		goto chmodStyleCheck;
	    }
	    newMode |= (1<<9);
	    break;
	case '-':
	    break;
	default:
	    /*
	     * Oops, not what we thought it was, so go on
	     */
	    goto chmodStyleCheck;
	}
    }
    *modePtr = newMode;
    return TCL_OK;

  chmodStyleCheck:
    /*
     * We now check for an "ugoa+-=rwxst" style permissions string
     */

    for (n = 0 ; *(modeStringPtr+n) != '\0' ; n = n + i) {
	oldMode = *modePtr;
	who = op = what = op_found = who_found = 0;
	for (i = 0 ; *(modeStringPtr+n+i) != '\0' ; i++ ) {
	    if (!who_found) {
		/* who */
		switch (*(modeStringPtr+n+i)) {
		case 'u':
		    who |= 0x9c0;
		    continue;
		case 'g':
		    who |= 0x438;
		    continue;
		case 'o':
		    who |= 0x207;
		    continue;
		case 'a':
		    who |= 0xfff;
		    continue;
		}
	    }
	    who_found = 1;
	    if (who == 0) {
		who = 0xfff;
	    }
	    if (!op_found) {
		/* op */
		switch (*(modeStringPtr+n+i)) {
		case '+':
		    op = 1;
		    op_found = 1;
		    continue;
		case '-':
		    op = 2;
		    op_found = 1;
		    continue;
		case '=':
		    op = 3;
		    op_found = 1;
		    continue;
		default:
		    return TCL_ERROR;
		}
	    }
	    /* what */
	    switch (*(modeStringPtr+n+i)) {
	    case 'r':
		what |= 0x124;
		continue;
	    case 'w':
		what |= 0x92;
		continue;
	    case 'x':
		what |= 0x49;
		continue;
	    case 's':
		what |= 0xc00;
		continue;
	    case 't':
		what |= 0x200;
		continue;
	    case ',':
		break;
	    default:
		return TCL_ERROR;
	    }
	    if (*(modeStringPtr+n+i) == ',') {
		i++;
		break;
	    }
	}
	switch (op) {
	case 1:
	    *modePtr = oldMode | (who & what);
	    continue;
	case 2:
	    *modePtr = oldMode & ~(who & what);
	    continue;
	case 3:
	    *modePtr = (oldMode & ~who) | (who & what);
	    continue;
	}
    }
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpObjNormalizePath --
 *
 *	This function scans through a path specification and replaces it, in
 *	place, with a normalized version. A normalized version is one in which
 *	all symlinks in the path are replaced with their expanded form (except
 *	a symlink at the very end of the path).
 *
 * Results:
 *	The new 'nextCheckpoint' value, giving as far as we could understand
 *	in the path.
 *
 * Side effects:
 *	The pathPtr string, is modified.
 *
 *---------------------------------------------------------------------------
 */

int
TclpObjNormalizePath(
    Tcl_Interp *interp,
    Tcl_Obj *pathPtr,
    int nextCheckpoint)
{
    const char *currentPathEndPosition;
    int pathLen;
    char cur;
    const char *path = Tcl_GetStringFromObj(pathPtr, &pathLen);
    Tcl_DString ds;
    const char *nativePath;
#ifndef NO_REALPATH
    char normPath[MAXPATHLEN];
#endif

    /*
     * We add '1' here because if nextCheckpoint is zero we know that '/'
     * exists, and if it isn't zero, it must point at a directory separator
     * which we also know exists.
     */

    currentPathEndPosition = path + nextCheckpoint;
    if (*currentPathEndPosition == '/') {
	currentPathEndPosition++;
    }

#ifndef NO_REALPATH
    /*
     * For speed, try to get the entire path in one go.
     */

    if (nextCheckpoint == 0 && haveRealpath) {
	char *lastDir = strrchr(currentPathEndPosition, '/');

	if (lastDir != NULL) {
	    nativePath = Tcl_UtfToExternalDString(NULL, path,
		    lastDir-path, &ds);
	    if (Realpath(nativePath, normPath) != NULL) {
		if (*nativePath != '/' && *normPath == '/') {
		    /*
		     * realpath has transformed a relative path into an
		     * absolute path, we do not know how to handle this.
		     */
		} else {
		    nextCheckpoint = lastDir - path;
		    goto wholeStringOk;
		}
	    }
	    Tcl_DStringFree(&ds);
	}
    }

    /*
     * Else do it the slow way.
     */
#endif

    while (1) {
	cur = *currentPathEndPosition;
	if ((cur == '/') && (path != currentPathEndPosition)) {
	    /*
	     * Reached directory separator.
	     */

	    int accessOk;

	    nativePath = Tcl_UtfToExternalDString(NULL, path,
		    currentPathEndPosition - path, &ds);
	    accessOk = access(nativePath, F_OK);
	    Tcl_DStringFree(&ds);

	    if (accessOk != 0) {
		/*
		 * File doesn't exist.
		 */

		break;
	    }

	    /*
	     * Update the acceptable point.
	     */

	    nextCheckpoint = currentPathEndPosition - path;
	} else if (cur == 0) {
	    /*
	     * Reached end of string.
	     */

	    break;
	}
	currentPathEndPosition++;
    }

    /*
     * We should really now convert this to a canonical path. We do that with
     * 'realpath' if we have it available. Otherwise we could step through
     * every single path component, checking whether it is a symlink, but that
     * would be a lot of work, and most modern OSes have 'realpath'.
     */

#ifndef NO_REALPATH
    if (haveRealpath) {
	/*
	 * If we only had '/foo' or '/' then we never increment nextCheckpoint
	 * and we don't need or want to go through 'Realpath'. Also, on some
	 * platforms, passing an empty string to 'Realpath' will give us the
	 * normalized pwd, which is not what we want at all!
	 */

	if (nextCheckpoint == 0) {
	    return 0;
	}

	nativePath = Tcl_UtfToExternalDString(NULL, path,nextCheckpoint, &ds);
	if (Realpath(nativePath, normPath) != NULL) {
	    int newNormLen;

	wholeStringOk:
	    newNormLen = strlen(normPath);
	    if ((newNormLen == Tcl_DStringLength(&ds))
		    && (strcmp(normPath, nativePath) == 0)) {
		/*
		 * String is unchanged.
		 */

		Tcl_DStringFree(&ds);

		/*
		 * Enable this to have the native FS claim normalization of
		 * the whole path for existing files. That would permit the
		 * caller to declare normalization complete without calls to
		 * additional filesystems. Saving lots of calls is probably
		 * worth the extra access() time here. When no other FS's are
		 * registered though, things are less clear.
		 *
		if (0 == access(normPath, F_OK)) {
		    return pathLen;
		}
		 */

		return nextCheckpoint;
	    }

	    /*
	     * Free up the native path and put in its place the converted,
	     * normalized path.
	     */

	    Tcl_DStringFree(&ds);
	    Tcl_ExternalToUtfDString(NULL, normPath, (int) newNormLen, &ds);

	    if (path[nextCheckpoint] != '\0') {
		/*
		 * Not at end, append remaining path.
		 */

		int normLen = Tcl_DStringLength(&ds);

		Tcl_DStringAppend(&ds, path + nextCheckpoint,
			pathLen - nextCheckpoint);

		/*
		 * We recognise up to and including the directory separator.
		 */

		nextCheckpoint = normLen + 1;
	    } else {
		/*
		 * We recognise the whole string.
		 */

		nextCheckpoint = Tcl_DStringLength(&ds);
	    }

	    /*
	     * Overwrite with the normalized path.
	     */

	    Tcl_SetStringObj(pathPtr, Tcl_DStringValue(&ds),
		    Tcl_DStringLength(&ds));
	}
	Tcl_DStringFree(&ds);
    }
#endif	/* !NO_REALPATH */

    return nextCheckpoint;
}

/*
 *----------------------------------------------------------------------
 *
 * TclpOpenTemporaryFile, TclUnixOpenTemporaryFile --
 *
 *	Creates a temporary file, possibly based on the supplied bits and
 *	pieces of template supplied in the first three arguments. If the
 *	fourth argument is non-NULL, it contains a Tcl_Obj to store the name
 *	of the temporary file in (and it is caller's responsibility to clean
 *	up). If the fourth argument is NULL, try to arrange for the temporary
 *	file to go away once it is no longer needed.
 *
 * Results:
 *	A read-write Tcl Channel open on the file for TclpOpenTemporaryFile,
 *	or a file descriptor (or -1 on failure) for TclUnixOpenTemporaryFile.
 *
 * Side effects:
 *	Accesses the filesystem. Will set the contents of the Tcl_Obj fourth
 *	argument (if that is non-NULL).
 *
 *----------------------------------------------------------------------
 */

Tcl_Channel
TclpOpenTemporaryFile(
    Tcl_Obj *dirObj,
    Tcl_Obj *basenameObj,
    Tcl_Obj *extensionObj,
    Tcl_Obj *resultingNameObj)
{
    int fd = TclUnixOpenTemporaryFile(dirObj, basenameObj, extensionObj,
	    resultingNameObj);

    if (fd == -1) {
	return NULL;
    }
    return Tcl_MakeFileChannel(INT2PTR(fd), TCL_READABLE|TCL_WRITABLE);
}

int
TclUnixOpenTemporaryFile(
    Tcl_Obj *dirObj,
    Tcl_Obj *basenameObj,
    Tcl_Obj *extensionObj,
    Tcl_Obj *resultingNameObj)
{
    Tcl_DString template, tmp;
    const char *string;
    int len, fd;

    /*
     * We should also check against making more then TMP_MAX of these.
     */

    if (dirObj) {
	string = Tcl_GetStringFromObj(dirObj, &len);
	Tcl_UtfToExternalDString(NULL, string, len, &template);
    } else {
	Tcl_DStringInit(&template);
	Tcl_DStringAppend(&template, DefaultTempDir(), -1); /* INTL: native */
    }

    TclDStringAppendLiteral(&template, "/");

    if (basenameObj) {
	string = Tcl_GetStringFromObj(basenameObj, &len);
	Tcl_UtfToExternalDString(NULL, string, len, &tmp);
	TclDStringAppendDString(&template, &tmp);
	Tcl_DStringFree(&tmp);
    } else {
	TclDStringAppendLiteral(&template, "tcl");
    }

    TclDStringAppendLiteral(&template, "_XXXXXX");

#ifdef HAVE_MKSTEMPS
    if (extensionObj) {
	string = Tcl_GetStringFromObj(extensionObj, &len);
	Tcl_UtfToExternalDString(NULL, string, len, &tmp);
	TclDStringAppendDString(&template, &tmp);
	fd = mkstemps(Tcl_DStringValue(&template), Tcl_DStringLength(&tmp));
	Tcl_DStringFree(&tmp);
    } else
#endif
    {
	fd = mkstemp(Tcl_DStringValue(&template));
    }

    if (fd == -1) {
	Tcl_DStringFree(&template);
	return -1;
    }

    if (resultingNameObj) {
	Tcl_ExternalToUtfDString(NULL, Tcl_DStringValue(&template),
		Tcl_DStringLength(&template), &tmp);
	Tcl_SetStringObj(resultingNameObj, Tcl_DStringValue(&tmp),
		Tcl_DStringLength(&tmp));
	Tcl_DStringFree(&tmp);
    } else {
	/*
	 * Try to delete the file immediately since we're not reporting the
	 * name to anyone. Note that we're *not* handling any errors from
	 * this!
	 */

	unlink(Tcl_DStringValue(&template));
	errno = 0;
    }
    Tcl_DStringFree(&template);

    return fd;
}

/*
 * Helper that does *part* of what tempnam() does.
 */

static const char *
DefaultTempDir(void)
{
    const char *dir;
    struct stat buf;

    dir = getenv("TMPDIR");
    if (dir && dir[0] && stat(dir, &buf) == 0 && S_ISDIR(buf.st_mode)
	    && access(dir, W_OK)) {
	return dir;
    }

#ifdef P_tmpdir
    dir = P_tmpdir;
    if (stat(dir, &buf) == 0 && S_ISDIR(buf.st_mode) && access(dir, W_OK)) {
	return dir;
    }
#endif

    /*
     * Assume that the default location ("/tmp" if not overridden) is always
     * an existing writable directory; we've no recovery mechanism if it
     * isn't.
     */

    return TCL_TEMPORARY_FILE_DIRECTORY;
}

#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
/*
 *----------------------------------------------------------------------
 *
 * GetReadOnlyAttribute
 *
 *	Gets the readonly attribute (user immutable flag) of a file.
 *
 * Results:
 *	Standard TCL result. Returns a new Tcl_Obj in attributePtrPtr if there
 *	is no error. The object will have ref count 0.
 *
 * Side effects:
 *	A new object is allocated.
 *
 *----------------------------------------------------------------------
 */

static int
GetReadOnlyAttribute(
    Tcl_Interp *interp,		/* The interp we are using for errors. */
    int objIndex,		/* The index of the attribute. */
    Tcl_Obj *fileName,		/* The name of the file (UTF-8). */
    Tcl_Obj **attributePtrPtr)	/* A pointer to return the object with. */
{
    Tcl_StatBuf statBuf;
    int result;

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not read \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));
	}
	return TCL_ERROR;
    }

    *attributePtrPtr = Tcl_NewLongObj((statBuf.st_flags&UF_IMMUTABLE)!=0);

    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * SetReadOnlyAttribute
 *
 *	Sets the readonly attribute (user immutable flag) of a file.
 *
 * Results:
 *	Standard TCL result.
 *
 * Side effects:
 *	The readonly attribute of the file is changed.
 *
 *---------------------------------------------------------------------------
 */

static int
SetReadOnlyAttribute(
    Tcl_Interp *interp,		/* The interp we are using for errors. */
    int objIndex,		/* The index of the attribute. */
    Tcl_Obj *fileName,		/* The name of the file (UTF-8). */
    Tcl_Obj *attributePtr)	/* The attribute to set. */
{
    Tcl_StatBuf statBuf;
    int result, readonly;
    const char *native;

    if (Tcl_GetBooleanFromObj(interp, attributePtr, &readonly) != TCL_OK) {
	return TCL_ERROR;
    }

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not read \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));
	}
	return TCL_ERROR;
    }

    if (readonly) {
	statBuf.st_flags |= UF_IMMUTABLE;
    } else {
	statBuf.st_flags &= ~UF_IMMUTABLE;
    }

    native = Tcl_FSGetNativePath(fileName);
    result = chflags(native, statBuf.st_flags);		/* INTL: Native. */
    if (result != 0) {
	if (interp != NULL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not set flags for file \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));
	}
	return TCL_ERROR;
    }
    return TCL_OK;
}
#endif /* defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE) */

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */