summaryrefslogtreecommitdiffstats
path: root/Modules/arraymodule.c
blob: ed2ea9d1688183427005a81b87c0f3ab70a2c5a2 (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
/* Array object implementation */

/* An array is a uniform list -- all items have the same type.
   The item type is restricted to simple C types like int or float */

#include "Python.h"

#ifdef STDC_HEADERS
#include <stddef.h>
#else /* !STDC_HEADERS */
#ifndef DONT_HAVE_SYS_TYPES_H
#include <sys/types.h>		/* For size_t */
#endif /* DONT_HAVE_SYS_TYPES_H */
#endif /* !STDC_HEADERS */

struct arrayobject; /* Forward */

/* All possible arraydescr values are defined in the vector "descriptors"
 * below.  That's defined later because the appropriate get and set
 * functions aren't visible yet.
 */
struct arraydescr {
	int typecode;
	int itemsize;
	PyObject * (*getitem)(struct arrayobject *, int);
	int (*setitem)(struct arrayobject *, int, PyObject *);
};

typedef struct arrayobject {
	PyObject_HEAD
	int ob_size;
	char *ob_item;
	int allocated;
	struct arraydescr *ob_descr;
} arrayobject;

static PyTypeObject Arraytype;

#define array_Check(op) PyObject_TypeCheck(op, &Arraytype)
#define array_CheckExact(op) ((op)->ob_type == &Arraytype)

static int
array_resize(arrayobject *self, int newsize)
{
	char *items;
	size_t _new_size;

	/* Bypass realloc() when a previous overallocation is large enough
	   to accommodate the newsize.  If the newsize is 16 smaller than the
	   current size, then proceed with the realloc() to shrink the list.
	*/

	if (self->allocated >= newsize &&
	    self->ob_size < newsize + 16 &&
	    self->ob_item != NULL) {
		self->ob_size = newsize;
		return 0;
	}

	/* This over-allocates proportional to the array size, making room
	 * for additional growth.  The over-allocation is mild, but is
	 * enough to give linear-time amortized behavior over a long
	 * sequence of appends() in the presence of a poorly-performing
	 * system realloc().
	 * The growth pattern is:  0, 4, 8, 16, 25, 34, 46, 56, 67, 79, ...
	 * Note, the pattern starts out the same as for lists but then
	 * grows at a smaller rate so that larger arrays only overallocate
	 * by about 1/16th -- this is done because arrays are presumed to be more
	 * memory critical.
	 */

	_new_size = (newsize >> 4) + (self->ob_size < 8 ? 3 : 7) + newsize;
	items = self->ob_item;
	/* XXX The following multiplication and division does not optimize away 
	   like it does for lists since the size is not known at compile time */
	if (_new_size <= ((~(size_t)0) / self->ob_descr->itemsize))
		PyMem_RESIZE(items, char, (_new_size * self->ob_descr->itemsize));
	else
		items = NULL;
	if (items == NULL) {
		PyErr_NoMemory();
		return -1;
	}
	self->ob_item = items;
	self->ob_size = newsize;
	self->allocated = _new_size;
	return 0;
}

/****************************************************************************
Get and Set functions for each type.
A Get function takes an arrayobject* and an integer index, returning the
array value at that index wrapped in an appropriate PyObject*.
A Set function takes an arrayobject, integer index, and PyObject*; sets
the array value at that index to the raw C data extracted from the PyObject*,
and returns 0 if successful, else nonzero on failure (PyObject* not of an
appropriate type or value).
Note that the basic Get and Set functions do NOT check that the index is
in bounds; that's the responsibility of the caller.
****************************************************************************/

static PyObject *
c_getitem(arrayobject *ap, int i)
{
	return PyString_FromStringAndSize(&((char *)ap->ob_item)[i], 1);
}

static int
c_setitem(arrayobject *ap, int i, PyObject *v)
{
	char x;
	if (!PyArg_Parse(v, "c;array item must be char", &x))
		return -1;
	if (i >= 0)
		((char *)ap->ob_item)[i] = x;
	return 0;
}

static PyObject *
b_getitem(arrayobject *ap, int i)
{
	long x = ((char *)ap->ob_item)[i];
	if (x >= 128)
		x -= 256;
	return PyInt_FromLong(x);
}

static int
b_setitem(arrayobject *ap, int i, PyObject *v)
{
	short x;
	/* PyArg_Parse's 'b' formatter is for an unsigned char, therefore
	   must use the next size up that is signed ('h') and manually do
	   the overflow checking */
	if (!PyArg_Parse(v, "h;array item must be integer", &x))
		return -1;
	else if (x < -128) {
		PyErr_SetString(PyExc_OverflowError,
			"signed char is less than minimum");
		return -1;
	}
	else if (x > 127) {
		PyErr_SetString(PyExc_OverflowError,
			"signed char is greater than maximum");
		return -1;
	}
	if (i >= 0)
		((char *)ap->ob_item)[i] = (char)x;
	return 0;
}

static PyObject *
BB_getitem(arrayobject *ap, int i)
{
	long x = ((unsigned char *)ap->ob_item)[i];
	return PyInt_FromLong(x);
}

static int
BB_setitem(arrayobject *ap, int i, PyObject *v)
{
	unsigned char x;
	/* 'B' == unsigned char, maps to PyArg_Parse's 'b' formatter */
	if (!PyArg_Parse(v, "b;array item must be integer", &x))
		return -1;
	if (i >= 0)
		((char *)ap->ob_item)[i] = x;
	return 0;
}

#ifdef Py_USING_UNICODE
static PyObject *
u_getitem(arrayobject *ap, int i)
{
	return PyUnicode_FromUnicode(&((Py_UNICODE *) ap->ob_item)[i], 1);
}

static int
u_setitem(arrayobject *ap, int i, PyObject *v)
{
	Py_UNICODE *p;
	int len;

	if (!PyArg_Parse(v, "u#;array item must be unicode character", &p, &len))
		return -1;
	if (len != 1) {
		PyErr_SetString(PyExc_TypeError, "array item must be unicode character");
		return -1;
	}
	if (i >= 0)
		((Py_UNICODE *)ap->ob_item)[i] = p[0];
	return 0;
}
#endif

static PyObject *
h_getitem(arrayobject *ap, int i)
{
	return PyInt_FromLong((long) ((short *)ap->ob_item)[i]);
}

static int
h_setitem(arrayobject *ap, int i, PyObject *v)
{
	short x;
	/* 'h' == signed short, maps to PyArg_Parse's 'h' formatter */
	if (!PyArg_Parse(v, "h;array item must be integer", &x))
		return -1;
	if (i >= 0)
		     ((short *)ap->ob_item)[i] = x;
	return 0;
}

static PyObject *
HH_getitem(arrayobject *ap, int i)
{
	return PyInt_FromLong((long) ((unsigned short *)ap->ob_item)[i]);
}

static int
HH_setitem(arrayobject *ap, int i, PyObject *v)
{
	int x;
	/* PyArg_Parse's 'h' formatter is for a signed short, therefore
	   must use the next size up and manually do the overflow checking */
	if (!PyArg_Parse(v, "i;array item must be integer", &x))
		return -1;
	else if (x < 0) {
		PyErr_SetString(PyExc_OverflowError,
			"unsigned short is less than minimum");
		return -1;
	}
	else if (x > USHRT_MAX) {
		PyErr_SetString(PyExc_OverflowError,
			"unsigned short is greater than maximum");
		return -1;
	}
	if (i >= 0)
		((short *)ap->ob_item)[i] = (short)x;
	return 0;
}

static PyObject *
i_getitem(arrayobject *ap, int i)
{
	return PyInt_FromLong((long) ((int *)ap->ob_item)[i]);
}

static int
i_setitem(arrayobject *ap, int i, PyObject *v)
{
	int x;
	/* 'i' == signed int, maps to PyArg_Parse's 'i' formatter */
	if (!PyArg_Parse(v, "i;array item must be integer", &x))
		return -1;
	if (i >= 0)
		     ((int *)ap->ob_item)[i] = x;
	return 0;
}

static PyObject *
II_getitem(arrayobject *ap, int i)
{
	return PyLong_FromUnsignedLong(
		(unsigned long) ((unsigned int *)ap->ob_item)[i]);
}

static int
II_setitem(arrayobject *ap, int i, PyObject *v)
{
	unsigned long x;
	if (PyLong_Check(v)) {
		x = PyLong_AsUnsignedLong(v);
		if (x == (unsigned long) -1 && PyErr_Occurred())
			return -1;
	}
	else {
		long y;
		if (!PyArg_Parse(v, "l;array item must be integer", &y))
			return -1;
		if (y < 0) {
			PyErr_SetString(PyExc_OverflowError,
				"unsigned int is less than minimum");
			return -1;
		}
		x = (unsigned long)y;

	}
	if (x > UINT_MAX) {
		PyErr_SetString(PyExc_OverflowError,
			"unsigned int is greater than maximum");
		return -1;
	}

	if (i >= 0)
		((unsigned int *)ap->ob_item)[i] = (unsigned int)x;
	return 0;
}

static PyObject *
l_getitem(arrayobject *ap, int i)
{
	return PyInt_FromLong(((long *)ap->ob_item)[i]);
}

static int
l_setitem(arrayobject *ap, int i, PyObject *v)
{
	long x;
	if (!PyArg_Parse(v, "l;array item must be integer", &x))
		return -1;
	if (i >= 0)
		     ((long *)ap->ob_item)[i] = x;
	return 0;
}

static PyObject *
LL_getitem(arrayobject *ap, int i)
{
	return PyLong_FromUnsignedLong(((unsigned long *)ap->ob_item)[i]);
}

static int
LL_setitem(arrayobject *ap, int i, PyObject *v)
{
	unsigned long x;
	if (PyLong_Check(v)) {
		x = PyLong_AsUnsignedLong(v);
		if (x == (unsigned long) -1 && PyErr_Occurred())
			return -1;
	}
	else {
		long y;
		if (!PyArg_Parse(v, "l;array item must be integer", &y))
			return -1;
		if (y < 0) {
			PyErr_SetString(PyExc_OverflowError,
				"unsigned long is less than minimum");
			return -1;
		}
		x = (unsigned long)y;

	}
	if (x > ULONG_MAX) {
		PyErr_SetString(PyExc_OverflowError,
			"unsigned long is greater than maximum");
		return -1;
	}

	if (i >= 0)
		((unsigned long *)ap->ob_item)[i] = x;
	return 0;
}

static PyObject *
f_getitem(arrayobject *ap, int i)
{
	return PyFloat_FromDouble((double) ((float *)ap->ob_item)[i]);
}

static int
f_setitem(arrayobject *ap, int i, PyObject *v)
{
	float x;
	if (!PyArg_Parse(v, "f;array item must be float", &x))
		return -1;
	if (i >= 0)
		     ((float *)ap->ob_item)[i] = x;
	return 0;
}

static PyObject *
d_getitem(arrayobject *ap, int i)
{
	return PyFloat_FromDouble(((double *)ap->ob_item)[i]);
}

static int
d_setitem(arrayobject *ap, int i, PyObject *v)
{
	double x;
	if (!PyArg_Parse(v, "d;array item must be float", &x))
		return -1;
	if (i >= 0)
		     ((double *)ap->ob_item)[i] = x;
	return 0;
}

/* Description of types */
static struct arraydescr descriptors[] = {
	{'c', sizeof(char), c_getitem, c_setitem},
	{'b', sizeof(char), b_getitem, b_setitem},
	{'B', sizeof(char), BB_getitem, BB_setitem},
#ifdef Py_USING_UNICODE
	{'u', sizeof(Py_UNICODE), u_getitem, u_setitem},
#endif
	{'h', sizeof(short), h_getitem, h_setitem},
	{'H', sizeof(short), HH_getitem, HH_setitem},
	{'i', sizeof(int), i_getitem, i_setitem},
	{'I', sizeof(int), II_getitem, II_setitem},
	{'l', sizeof(long), l_getitem, l_setitem},
	{'L', sizeof(long), LL_getitem, LL_setitem},
	{'f', sizeof(float), f_getitem, f_setitem},
	{'d', sizeof(double), d_getitem, d_setitem},
	{'\0', 0, 0, 0} /* Sentinel */
};

/****************************************************************************
Implementations of array object methods.
****************************************************************************/

static PyObject *
newarrayobject(PyTypeObject *type, int size, struct arraydescr *descr)
{
	arrayobject *op;
	size_t nbytes;

	if (size < 0) {
		PyErr_BadInternalCall();
		return NULL;
	}

	nbytes = size * descr->itemsize;
	/* Check for overflow */
	if (nbytes / descr->itemsize != (size_t)size) {
		return PyErr_NoMemory();
	}
	op = (arrayobject *) type->tp_alloc(type, 0);
	if (op == NULL) {
		return NULL;
	}
	op->ob_size = size;
	if (size <= 0) {
		op->ob_item = NULL;
	}
	else {
		op->ob_item = PyMem_NEW(char, nbytes);
		if (op->ob_item == NULL) {
			PyObject_Del(op);
			return PyErr_NoMemory();
		}
	}
	op->ob_descr = descr;
	op->allocated = size;
	return (PyObject *) op;
}

static PyObject *
getarrayitem(PyObject *op, int i)
{
	register arrayobject *ap;
	assert(array_Check(op));
	ap = (arrayobject *)op;
	assert(i>=0 && i<ap->ob_size);
	return (*ap->ob_descr->getitem)(ap, i);
}

static int
ins1(arrayobject *self, int where, PyObject *v)
{
	char *items;
	int n = self->ob_size;
	if (v == NULL) {
		PyErr_BadInternalCall();
		return -1;
	}
	if ((*self->ob_descr->setitem)(self, -1, v) < 0)
		return -1;

	if (array_resize(self, n+1) == -1)
		return -1;
	items = self->ob_item;
	if (where < 0) {
		where += n;
		if (where < 0)
			where = 0;
	}
	if (where > n)
		where = n;
	/* appends don't need to call memmove() */
	if (where != n)
		memmove(items + (where+1)*self->ob_descr->itemsize,
			items + where*self->ob_descr->itemsize,
			(n-where)*self->ob_descr->itemsize);
	return (*self->ob_descr->setitem)(self, where, v);
}

/* Methods */

static void
array_dealloc(arrayobject *op)
{
	if (op->ob_item != NULL)
		PyMem_DEL(op->ob_item);
	op->ob_type->tp_free((PyObject *)op);
}

static PyObject *
array_richcompare(PyObject *v, PyObject *w, int op)
{
	arrayobject *va, *wa;
	PyObject *vi = NULL;
	PyObject *wi = NULL;
	int i, k;
	PyObject *res;

	if (!array_Check(v) || !array_Check(w)) {
		Py_INCREF(Py_NotImplemented);
		return Py_NotImplemented;
	}

	va = (arrayobject *)v;
	wa = (arrayobject *)w;

	if (va->ob_size != wa->ob_size && (op == Py_EQ || op == Py_NE)) {
		/* Shortcut: if the lengths differ, the arrays differ */
		if (op == Py_EQ)
			res = Py_False;
		else
			res = Py_True;
		Py_INCREF(res);
		return res;
	}

	/* Search for the first index where items are different */
	k = 1;
	for (i = 0; i < va->ob_size && i < wa->ob_size; i++) {
		vi = getarrayitem(v, i);
		wi = getarrayitem(w, i);
		if (vi == NULL || wi == NULL) {
			Py_XDECREF(vi);
			Py_XDECREF(wi);
			return NULL;
		}
		k = PyObject_RichCompareBool(vi, wi, Py_EQ);
		if (k == 0)
			break; /* Keeping vi and wi alive! */
		Py_DECREF(vi);
		Py_DECREF(wi);
		if (k < 0)
			return NULL;
	}

	if (k) {
		/* No more items to compare -- compare sizes */
		int vs = va->ob_size;
		int ws = wa->ob_size;
		int cmp;
		switch (op) {
		case Py_LT: cmp = vs <  ws; break;
		case Py_LE: cmp = vs <= ws; break;
		case Py_EQ: cmp = vs == ws; break;
		case Py_NE: cmp = vs != ws; break;
		case Py_GT: cmp = vs >  ws; break;
		case Py_GE: cmp = vs >= ws; break;
		default: return NULL; /* cannot happen */
		}
		if (cmp)
			res = Py_True;
		else
			res = Py_False;
		Py_INCREF(res);
		return res;
	}

	/* We have an item that differs.  First, shortcuts for EQ/NE */
	if (op == Py_EQ) {
		Py_INCREF(Py_False);
		res = Py_False;
	}
	else if (op == Py_NE) {
		Py_INCREF(Py_True);
		res = Py_True;
	}
	else {
		/* Compare the final item again using the proper operator */
		res = PyObject_RichCompare(vi, wi, op);
	}
	Py_DECREF(vi);
	Py_DECREF(wi);
	return res;
}

static int
array_length(arrayobject *a)
{
	return a->ob_size;
}

static PyObject *
array_item(arrayobject *a, int i)
{
	if (i < 0 || i >= a->ob_size) {
		PyErr_SetString(PyExc_IndexError, "array index out of range");
		return NULL;
	}
	return getarrayitem((PyObject *)a, i);
}

static PyObject *
array_slice(arrayobject *a, int ilow, int ihigh)
{
	arrayobject *np;
	if (ilow < 0)
		ilow = 0;
	else if (ilow > a->ob_size)
		ilow = a->ob_size;
	if (ihigh < 0)
		ihigh = 0;
	if (ihigh < ilow)
		ihigh = ilow;
	else if (ihigh > a->ob_size)
		ihigh = a->ob_size;
	np = (arrayobject *) newarrayobject(&Arraytype, ihigh - ilow, a->ob_descr);
	if (np == NULL)
		return NULL;
	memcpy(np->ob_item, a->ob_item + ilow * a->ob_descr->itemsize,
	       (ihigh-ilow) * a->ob_descr->itemsize);
	return (PyObject *)np;
}

static PyObject *
array_copy(arrayobject *a, PyObject *unused)
{
	return array_slice(a, 0, a->ob_size);
}

PyDoc_STRVAR(copy_doc,
"copy(array)\n\
\n\
 Return a copy of the array.");

static PyObject *
array_concat(arrayobject *a, PyObject *bb)
{
	int size;
	arrayobject *np;
	if (!array_Check(bb)) {
		PyErr_Format(PyExc_TypeError,
		     "can only append array (not \"%.200s\") to array",
			     bb->ob_type->tp_name);
		return NULL;
	}
#define b ((arrayobject *)bb)
	if (a->ob_descr != b->ob_descr) {
		PyErr_BadArgument();
		return NULL;
	}
	size = a->ob_size + b->ob_size;
	np = (arrayobject *) newarrayobject(&Arraytype, size, a->ob_descr);
	if (np == NULL) {
		return NULL;
	}
	memcpy(np->ob_item, a->ob_item, a->ob_size*a->ob_descr->itemsize);
	memcpy(np->ob_item + a->ob_size*a->ob_descr->itemsize,
	       b->ob_item, b->ob_size*b->ob_descr->itemsize);
	return (PyObject *)np;
#undef b
}

static PyObject *
array_repeat(arrayobject *a, int n)
{
	int i;
	int size;
	arrayobject *np;
	char *p;
	int nbytes;
	if (n < 0)
		n = 0;
	size = a->ob_size * n;
	np = (arrayobject *) newarrayobject(&Arraytype, size, a->ob_descr);
	if (np == NULL)
		return NULL;
	p = np->ob_item;
	nbytes = a->ob_size * a->ob_descr->itemsize;
	for (i = 0; i < n; i++) {
		memcpy(p, a->ob_item, nbytes);
		p += nbytes;
	}
	return (PyObject *) np;
}

static int
array_ass_slice(arrayobject *a, int ilow, int ihigh, PyObject *v)
{
	char *item;
	int n; /* Size of replacement array */
	int d; /* Change in size */
#define b ((arrayobject *)v)
	if (v == NULL)
		n = 0;
	else if (array_Check(v)) {
		n = b->ob_size;
		if (a == b) {
			/* Special case "a[i:j] = a" -- copy b first */
			int ret;
			v = array_slice(b, 0, n);
			ret = array_ass_slice(a, ilow, ihigh, v);
			Py_DECREF(v);
			return ret;
		}
		if (b->ob_descr != a->ob_descr) {
			PyErr_BadArgument();
			return -1;
		}
	}
	else {
		PyErr_Format(PyExc_TypeError,
	     "can only assign array (not \"%.200s\") to array slice",
			     v->ob_type->tp_name);
		return -1;
	}
	if (ilow < 0)
		ilow = 0;
	else if (ilow > a->ob_size)
		ilow = a->ob_size;
	if (ihigh < 0)
		ihigh = 0;
	if (ihigh < ilow)
		ihigh = ilow;
	else if (ihigh > a->ob_size)
		ihigh = a->ob_size;
	item = a->ob_item;
	d = n - (ihigh-ilow);
	if (d < 0) { /* Delete -d items */
		memmove(item + (ihigh+d)*a->ob_descr->itemsize,
			item + ihigh*a->ob_descr->itemsize,
			(a->ob_size-ihigh)*a->ob_descr->itemsize);
		a->ob_size += d;
		PyMem_RESIZE(item, char, a->ob_size*a->ob_descr->itemsize);
						/* Can't fail */
		a->ob_item = item;
		a->allocated = a->ob_size;
	}
	else if (d > 0) { /* Insert d items */
		PyMem_RESIZE(item, char,
			     (a->ob_size + d)*a->ob_descr->itemsize);
		if (item == NULL) {
			PyErr_NoMemory();
			return -1;
		}
		memmove(item + (ihigh+d)*a->ob_descr->itemsize,
			item + ihigh*a->ob_descr->itemsize,
			(a->ob_size-ihigh)*a->ob_descr->itemsize);
		a->ob_item = item;
		a->ob_size += d;
		a->allocated = a->ob_size;
	}
	if (n > 0)
		memcpy(item + ilow*a->ob_descr->itemsize, b->ob_item,
		       n*b->ob_descr->itemsize);
	return 0;
#undef b
}

static int
array_ass_item(arrayobject *a, int i, PyObject *v)
{
	if (i < 0 || i >= a->ob_size) {
		PyErr_SetString(PyExc_IndexError,
			         "array assignment index out of range");
		return -1;
	}
	if (v == NULL)
		return array_ass_slice(a, i, i+1, v);
	return (*a->ob_descr->setitem)(a, i, v);
}

static int
setarrayitem(PyObject *a, int i, PyObject *v)
{
	assert(array_Check(a));
	return array_ass_item((arrayobject *)a, i, v);
}

static int
array_iter_extend(arrayobject *self, PyObject *bb)
{
	PyObject *it, *v;

	it = PyObject_GetIter(bb);
	if (it == NULL)
		return -1;

	while ((v = PyIter_Next(it)) != NULL) {
		if (ins1(self, (int) self->ob_size, v) != 0) {
			Py_DECREF(v);
			Py_DECREF(it);
			return -1;
		}
		Py_DECREF(v);
	}
	Py_DECREF(it);
	if (PyErr_Occurred())
		return -1;
	return 0;
}

static int
array_do_extend(arrayobject *self, PyObject *bb)
{
	int size;

	if (!array_Check(bb))
		return array_iter_extend(self, bb);
#define b ((arrayobject *)bb)
	if (self->ob_descr != b->ob_descr) {
		PyErr_SetString(PyExc_TypeError,
			     "can only extend with array of same kind");
		return -1;
	}
	size = self->ob_size + b->ob_size;
        PyMem_RESIZE(self->ob_item, char, size*self->ob_descr->itemsize);
        if (self->ob_item == NULL) {
                PyObject_Del(self);
                PyErr_NoMemory();
		return -1;
        }
	memcpy(self->ob_item + self->ob_size*self->ob_descr->itemsize,
               b->ob_item, b->ob_size*b->ob_descr->itemsize);
	self->ob_size = size;
	self->allocated = size;

	return 0;
#undef b
}

static PyObject *
array_inplace_concat(arrayobject *self, PyObject *bb)
{
	if (!array_Check(bb)) {
		PyErr_Format(PyExc_TypeError,
			"can only extend array with array (not \"%.200s\")",
			bb->ob_type->tp_name);
		return NULL;
	}
	if (array_do_extend(self, bb) == -1)
		return NULL;
	Py_INCREF(self);
	return (PyObject *)self;
}

static PyObject *
array_inplace_repeat(arrayobject *self, int n)
{
	char *items, *p;
	int size, i;

	if (self->ob_size > 0) {
		if (n < 0)
			n = 0;
		items = self->ob_item;
		size = self->ob_size * self->ob_descr->itemsize;
		if (n == 0) {
			PyMem_FREE(items);
			self->ob_item = NULL;
			self->ob_size = 0;
			self->allocated = 0;
		}
		else {
			PyMem_Resize(items, char, n * size);
			if (items == NULL)
				return PyErr_NoMemory();
			p = items;
			for (i = 1; i < n; i++) {
				p += size;
				memcpy(p, items, size);
			}
			self->ob_item = items;
			self->ob_size *= n;
			self->allocated = self->ob_size;
		}
	}
	Py_INCREF(self);
	return (PyObject *)self;
}


static PyObject *
ins(arrayobject *self, int where, PyObject *v)
{
	if (ins1(self, where, v) != 0)
		return NULL;
	Py_INCREF(Py_None);
	return Py_None;
}

static PyObject *
array_count(arrayobject *self, PyObject *v)
{
	int count = 0;
	int i;

	for (i = 0; i < self->ob_size; i++) {
		PyObject *selfi = getarrayitem((PyObject *)self, i);
		int cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
		Py_DECREF(selfi);
		if (cmp > 0)
			count++;
		else if (cmp < 0)
			return NULL;
	}
	return PyInt_FromLong((long)count);
}

PyDoc_STRVAR(count_doc,
"count(x)\n\
\n\
Return number of occurences of x in the array.");

static PyObject *
array_index(arrayobject *self, PyObject *v)
{
	int i;

	for (i = 0; i < self->ob_size; i++) {
		PyObject *selfi = getarrayitem((PyObject *)self, i);
		int cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
		Py_DECREF(selfi);
		if (cmp > 0) {
			return PyInt_FromLong((long)i);
		}
		else if (cmp < 0)
			return NULL;
	}
	PyErr_SetString(PyExc_ValueError, "array.index(x): x not in list");
	return NULL;
}

PyDoc_STRVAR(index_doc,
"index(x)\n\
\n\
Return index of first occurence of x in the array.");

static int
array_contains(arrayobject *self, PyObject *v)
{
	int i, cmp;

	for (i = 0, cmp = 0 ; cmp == 0 && i < self->ob_size; i++) {
		PyObject *selfi = getarrayitem((PyObject *)self, i);
		cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
		Py_DECREF(selfi);
	}
	return cmp;
}

static PyObject *
array_remove(arrayobject *self, PyObject *v)
{
	int i;

	for (i = 0; i < self->ob_size; i++) {
		PyObject *selfi = getarrayitem((PyObject *)self,i);
		int cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
		Py_DECREF(selfi);
		if (cmp > 0) {
			if (array_ass_slice(self, i, i+1,
					   (PyObject *)NULL) != 0)
				return NULL;
			Py_INCREF(Py_None);
			return Py_None;
		}
		else if (cmp < 0)
			return NULL;
	}
	PyErr_SetString(PyExc_ValueError, "array.remove(x): x not in list");
	return NULL;
}

PyDoc_STRVAR(remove_doc,
"remove(x)\n\
\n\
Remove the first occurence of x in the array.");

static PyObject *
array_pop(arrayobject *self, PyObject *args)
{
	int i = -1;
	PyObject *v;
	if (!PyArg_ParseTuple(args, "|i:pop", &i))
		return NULL;
	if (self->ob_size == 0) {
		/* Special-case most common failure cause */
		PyErr_SetString(PyExc_IndexError, "pop from empty array");
		return NULL;
	}
	if (i < 0)
		i += self->ob_size;
	if (i < 0 || i >= self->ob_size) {
		PyErr_SetString(PyExc_IndexError, "pop index out of range");
		return NULL;
	}
	v = getarrayitem((PyObject *)self,i);
	if (array_ass_slice(self, i, i+1, (PyObject *)NULL) != 0) {
		Py_DECREF(v);
		return NULL;
	}
	return v;
}

PyDoc_STRVAR(pop_doc,
"pop([i])\n\
\n\
Return the i-th element and delete it from the array. i defaults to -1.");

static PyObject *
array_extend(arrayobject *self, PyObject *bb)
{
	if (array_do_extend(self, bb) == -1)
		return NULL;
	Py_INCREF(Py_None);
	return Py_None;
}

PyDoc_STRVAR(extend_doc,
"extend(array or iterable)\n\
\n\
 Append items to the end of the array.");

static PyObject *
array_insert(arrayobject *self, PyObject *args)
{
	int i;
	PyObject *v;
        if (!PyArg_ParseTuple(args, "iO:insert", &i, &v))
		return NULL;
	return ins(self, i, v);
}

PyDoc_STRVAR(insert_doc,
"insert(i,x)\n\
\n\
Insert a new item x into the array before position i.");


static PyObject *
array_buffer_info(arrayobject *self, PyObject *unused)
{
	PyObject* retval = NULL;
	retval = PyTuple_New(2);
	if (!retval)
		return NULL;

	PyTuple_SET_ITEM(retval, 0, PyLong_FromVoidPtr(self->ob_item));
	PyTuple_SET_ITEM(retval, 1, PyInt_FromLong((long)(self->ob_size)));

	return retval;
}

PyDoc_STRVAR(buffer_info_doc,
"buffer_info() -> (address, length)\n\
\n\
Return a tuple (address, length) giving the current memory address and\n\
the length in items of the buffer used to hold array's contents\n\
The length should be multiplied by the itemsize attribute to calculate\n\
the buffer length in bytes.");


static PyObject *
array_append(arrayobject *self, PyObject *v)
{
	return ins(self, (int) self->ob_size, v);
}

PyDoc_STRVAR(append_doc,
"append(x)\n\
\n\
Append new value x to the end of the array.");


static PyObject *
array_byteswap(arrayobject *self, PyObject *unused)
{
	char *p;
	int i;

	switch (self->ob_descr->itemsize) {
	case 1:
		break;
	case 2:
		for (p = self->ob_item, i = self->ob_size; --i >= 0; p += 2) {
			char p0 = p[0];
			p[0] = p[1];
			p[1] = p0;
		}
		break;
	case 4:
		for (p = self->ob_item, i = self->ob_size; --i >= 0; p += 4) {
			char p0 = p[0];
			char p1 = p[1];
			p[0] = p[3];
			p[1] = p[2];
			p[2] = p1;
			p[3] = p0;
		}
		break;
	case 8:
		for (p = self->ob_item, i = self->ob_size; --i >= 0; p += 8) {
			char p0 = p[0];
			char p1 = p[1];
			char p2 = p[2];
			char p3 = p[3];
			p[0] = p[7];
			p[1] = p[6];
			p[2] = p[5];
			p[3] = p[4];
			p[4] = p3;
			p[5] = p2;
			p[6] = p1;
			p[7] = p0;
		}
		break;
	default:
		PyErr_SetString(PyExc_RuntimeError,
			   "don't know how to byteswap this array type");
		return NULL;
	}
	Py_INCREF(Py_None);
	return Py_None;
}

PyDoc_STRVAR(byteswap_doc,
"byteswap()\n\
\n\
Byteswap all items of the array.  If the items in the array are not 1, 2,\n\
4, or 8 bytes in size, RuntimeError is raised.");

static PyObject *
array_reverse(arrayobject *self, PyObject *unused)
{
	register int itemsize = self->ob_descr->itemsize;
	register char *p, *q;
	/* little buffer to hold items while swapping */
	char tmp[256];	/* 8 is probably enough -- but why skimp */
	assert(itemsize <= sizeof(tmp));

	if (self->ob_size > 1) {
		for (p = self->ob_item,
		     q = self->ob_item + (self->ob_size - 1)*itemsize;
		     p < q;
		     p += itemsize, q -= itemsize) {
			/* memory areas guaranteed disjoint, so memcpy
			 * is safe (& memmove may be slower).
			 */
			memcpy(tmp, p, itemsize);
			memcpy(p, q, itemsize);
			memcpy(q, tmp, itemsize);
		}
	}

	Py_INCREF(Py_None);
	return Py_None;
}

PyDoc_STRVAR(reverse_doc,
"reverse()\n\
\n\
Reverse the order of the items in the array.");

static PyObject *
array_fromfile(arrayobject *self, PyObject *args)
{
	PyObject *f;
	int n;
	FILE *fp;
        if (!PyArg_ParseTuple(args, "Oi:fromfile", &f, &n))
		return NULL;
	fp = PyFile_AsFile(f);
	if (fp == NULL) {
		PyErr_SetString(PyExc_TypeError, "arg1 must be open file");
		return NULL;
	}
	if (n > 0) {
		char *item = self->ob_item;
		int itemsize = self->ob_descr->itemsize;
		size_t nread;
		int newlength;
		size_t newbytes;
		/* Be careful here about overflow */
		if ((newlength = self->ob_size + n) <= 0 ||
		    (newbytes = newlength * itemsize) / itemsize !=
		    (size_t)newlength)
			goto nomem;
		PyMem_RESIZE(item, char, newbytes);
		if (item == NULL) {
		  nomem:
			PyErr_NoMemory();
			return NULL;
		}
		self->ob_item = item;
		self->ob_size += n;
		self->allocated = self->ob_size;
		nread = fread(item + (self->ob_size - n) * itemsize,
			      itemsize, n, fp);
		if (nread < (size_t)n) {
			self->ob_size -= (n - nread);
			PyMem_RESIZE(item, char, self->ob_size*itemsize);
			self->ob_item = item;
			self->allocated = self->ob_size;
			PyErr_SetString(PyExc_EOFError,
				         "not enough items in file");
			return NULL;
		}
	}
	Py_INCREF(Py_None);
	return Py_None;
}

PyDoc_STRVAR(fromfile_doc,
"fromfile(f, n)\n\
\n\
Read n objects from the file object f and append them to the end of the\n\
array.  Also called as read.");


static PyObject *
array_tofile(arrayobject *self, PyObject *f)
{
	FILE *fp;

	fp = PyFile_AsFile(f);
	if (fp == NULL) {
		PyErr_SetString(PyExc_TypeError, "arg must be open file");
		return NULL;
	}
	if (self->ob_size > 0) {
		if (fwrite(self->ob_item, self->ob_descr->itemsize,
			   self->ob_size, fp) != (size_t)self->ob_size) {
			PyErr_SetFromErrno(PyExc_IOError);
			clearerr(fp);
			return NULL;
		}
	}
	Py_INCREF(Py_None);
	return Py_None;
}

PyDoc_STRVAR(tofile_doc,
"tofile(f)\n\
\n\
Write all items (as machine values) to the file object f.  Also called as\n\
write.");


static PyObject *
array_fromlist(arrayobject *self, PyObject *list)
{
	int n;
	int itemsize = self->ob_descr->itemsize;

	if (!PyList_Check(list)) {
		PyErr_SetString(PyExc_TypeError, "arg must be list");
		return NULL;
	}
	n = PyList_Size(list);
	if (n > 0) {
		char *item = self->ob_item;
		int i;
		PyMem_RESIZE(item, char, (self->ob_size + n) * itemsize);
		if (item == NULL) {
			PyErr_NoMemory();
			return NULL;
		}
		self->ob_item = item;
		self->ob_size += n;
		self->allocated = self->ob_size;
		for (i = 0; i < n; i++) {
			PyObject *v = PyList_GetItem(list, i);
			if ((*self->ob_descr->setitem)(self,
					self->ob_size - n + i, v) != 0) {
				self->ob_size -= n;
				PyMem_RESIZE(item, char,
					          self->ob_size * itemsize);
				self->ob_item = item;
				self->allocated = self->ob_size;
				return NULL;
			}
		}
	}
	Py_INCREF(Py_None);
	return Py_None;
}

PyDoc_STRVAR(fromlist_doc,
"fromlist(list)\n\
\n\
Append items to array from list.");


static PyObject *
array_tolist(arrayobject *self, PyObject *unused)
{
	PyObject *list = PyList_New(self->ob_size);
	int i;

	if (list == NULL)
		return NULL;
	for (i = 0; i < self->ob_size; i++) {
		PyObject *v = getarrayitem((PyObject *)self, i);
		if (v == NULL) {
			Py_DECREF(list);
			return NULL;
		}
		PyList_SetItem(list, i, v);
	}
	return list;
}

PyDoc_STRVAR(tolist_doc,
"tolist() -> list\n\
\n\
Convert array to an ordinary list with the same items.");


static PyObject *
array_fromstring(arrayobject *self, PyObject *args)
{
	char *str;
	int n;
	int itemsize = self->ob_descr->itemsize;
        if (!PyArg_ParseTuple(args, "s#:fromstring", &str, &n))
		return NULL;
	if (n % itemsize != 0) {
		PyErr_SetString(PyExc_ValueError,
			   "string length not a multiple of item size");
		return NULL;
	}
	n = n / itemsize;
	if (n > 0) {
		char *item = self->ob_item;
		PyMem_RESIZE(item, char, (self->ob_size + n) * itemsize);
		if (item == NULL) {
			PyErr_NoMemory();
			return NULL;
		}
		self->ob_item = item;
		self->ob_size += n;
		self->allocated = self->ob_size;
		memcpy(item + (self->ob_size - n) * itemsize,
		       str, itemsize*n);
	}
	Py_INCREF(Py_None);
	return Py_None;
}

PyDoc_STRVAR(fromstring_doc,
"fromstring(string)\n\
\n\
Appends items from the string, interpreting it as an array of machine\n\
values,as if it had been read from a file using the fromfile() method).");


static PyObject *
array_tostring(arrayobject *self, PyObject *unused)
{
	return PyString_FromStringAndSize(self->ob_item,
				    self->ob_size * self->ob_descr->itemsize);
}

PyDoc_STRVAR(tostring_doc,
"tostring() -> string\n\
\n\
Convert the array to an array of machine values and return the string\n\
representation.");



#ifdef Py_USING_UNICODE
static PyObject *
array_fromunicode(arrayobject *self, PyObject *args)
{
	Py_UNICODE *ustr;
	int n;

        if (!PyArg_ParseTuple(args, "u#:fromunicode", &ustr, &n))
		return NULL;
	if (self->ob_descr->typecode != 'u') {
		PyErr_SetString(PyExc_ValueError,
			"fromunicode() may only be called on "
			"type 'u' arrays");
		return NULL;
	}
	if (n > 0) {
		Py_UNICODE *item = (Py_UNICODE *) self->ob_item;
		PyMem_RESIZE(item, Py_UNICODE, self->ob_size + n);
		if (item == NULL) {
			PyErr_NoMemory();
			return NULL;
		}
		self->ob_item = (char *) item;
		self->ob_size += n;
		self->allocated = self->ob_size;
		memcpy(item + self->ob_size - n,
		       ustr, n * sizeof(Py_UNICODE));
	}

	Py_INCREF(Py_None);
	return Py_None;
}

PyDoc_STRVAR(fromunicode_doc,
"fromunicode(ustr)\n\
\n\
Extends this array with data from the unicode string ustr.\n\
The array must be a type 'u' array; otherwise a ValueError\n\
is raised.  Use array.fromstring(ustr.decode(...)) to\n\
append Unicode data to an array of some other type.");


static PyObject *
array_tounicode(arrayobject *self, PyObject *unused)
{
	if (self->ob_descr->typecode != 'u') {
		PyErr_SetString(PyExc_ValueError,
			"tounicode() may only be called on type 'u' arrays");
		return NULL;
	}
	return PyUnicode_FromUnicode((Py_UNICODE *) self->ob_item, self->ob_size);
}

PyDoc_STRVAR(tounicode_doc,
"tounicode() -> unicode\n\
\n\
Convert the array to a unicode string.  The array must be\n\
a type 'u' array; otherwise a ValueError is raised.  Use\n\
array.tostring().decode() to obtain a unicode string from\n\
an array of some other type.");

#endif /* Py_USING_UNICODE */


static PyObject *
array_get_typecode(arrayobject *a, void *closure)
{
	char tc = a->ob_descr->typecode;
	return PyString_FromStringAndSize(&tc, 1);
}

static PyObject *
array_get_itemsize(arrayobject *a, void *closure)
{
	return PyInt_FromLong((long)a->ob_descr->itemsize);
}

static PyGetSetDef array_getsets [] = {
	{"typecode", (getter) array_get_typecode, NULL,
	 "the typecode character used to create the array"},
	{"itemsize", (getter) array_get_itemsize, NULL,
	 "the size, in bytes, of one array item"},
	{NULL}
};

PyMethodDef array_methods[] = {
	{"append",	(PyCFunction)array_append,	METH_O,
	 append_doc},
	{"buffer_info", (PyCFunction)array_buffer_info, METH_NOARGS,
	 buffer_info_doc},
	{"byteswap",	(PyCFunction)array_byteswap,	METH_NOARGS,
	 byteswap_doc},
	{"__copy__",	(PyCFunction)array_copy,	METH_NOARGS,
	 copy_doc},
	{"count",	(PyCFunction)array_count,	METH_O,
	 count_doc},
	{"__deepcopy__",(PyCFunction)array_copy,	METH_NOARGS,
	 copy_doc},
	{"extend",      (PyCFunction)array_extend,	METH_O,
	 extend_doc},
	{"fromfile",	(PyCFunction)array_fromfile,	METH_VARARGS,
	 fromfile_doc},
	{"fromlist",	(PyCFunction)array_fromlist,	METH_O,
	 fromlist_doc},
	{"fromstring",	(PyCFunction)array_fromstring,	METH_VARARGS,
	 fromstring_doc},
#ifdef Py_USING_UNICODE
	{"fromunicode",	(PyCFunction)array_fromunicode,	METH_VARARGS,
	 fromunicode_doc},
#endif
	{"index",	(PyCFunction)array_index,	METH_O,
	 index_doc},
	{"insert",	(PyCFunction)array_insert,	METH_VARARGS,
	 insert_doc},
	{"pop",		(PyCFunction)array_pop,		METH_VARARGS,
	 pop_doc},
	{"read",	(PyCFunction)array_fromfile,	METH_VARARGS,
	 fromfile_doc},
	{"remove",	(PyCFunction)array_remove,	METH_O,
	 remove_doc},
	{"reverse",	(PyCFunction)array_reverse,	METH_NOARGS,
	 reverse_doc},
/*	{"sort",	(PyCFunction)array_sort,	METH_VARARGS,
	sort_doc},*/
	{"tofile",	(PyCFunction)array_tofile,	METH_O,
	 tofile_doc},
	{"tolist",	(PyCFunction)array_tolist,	METH_NOARGS,
	 tolist_doc},
	{"tostring",	(PyCFunction)array_tostring,	METH_NOARGS,
	 tostring_doc},
#ifdef Py_USING_UNICODE
	{"tounicode",   (PyCFunction)array_tounicode,	METH_NOARGS,
	 tounicode_doc},
#endif
	{"write",	(PyCFunction)array_tofile,	METH_O,
	 tofile_doc},
	{NULL,		NULL}		/* sentinel */
};

static PyObject *
array_repr(arrayobject *a)
{
	char buf[256], typecode;
	PyObject *s, *t, *v = NULL;
	int len;

	len = a->ob_size;
	typecode = a->ob_descr->typecode;
	if (len == 0) {
		PyOS_snprintf(buf, sizeof(buf), "array('%c')", typecode);
		return PyString_FromString(buf);
	}
		
	if (typecode == 'c')
		v = array_tostring(a, NULL);
#ifdef Py_USING_UNICODE
	else if (typecode == 'u')
		v = array_tounicode(a, NULL);
#endif
	else
		v = array_tolist(a, NULL);
	t = PyObject_Repr(v);
	Py_XDECREF(v);

	PyOS_snprintf(buf, sizeof(buf), "array('%c', ", typecode);
	s = PyString_FromString(buf);
	PyString_ConcatAndDel(&s, t);
	PyString_ConcatAndDel(&s, PyString_FromString(")"));
	return s;
}

static PyObject*
array_subscr(arrayobject* self, PyObject* item)
{
	if (PyInt_Check(item)) {
		long i = PyInt_AS_LONG(item);
		if (i < 0)
			i += self->ob_size;
		return array_item(self, i);
	}
	else if (PyLong_Check(item)) {
		long i = PyLong_AsLong(item);
		if (i == -1 && PyErr_Occurred())
			return NULL;
		if (i < 0)
			i += self->ob_size;
		return array_item(self, i);
	}
	else if (PySlice_Check(item)) {
		int start, stop, step, slicelength, cur, i;
		PyObject* result;
		arrayobject* ar;
		int itemsize = self->ob_descr->itemsize;

		if (PySlice_GetIndicesEx((PySliceObject*)item, self->ob_size,
				 &start, &stop, &step, &slicelength) < 0) {
			return NULL;
		}

		if (slicelength <= 0) {
			return newarrayobject(&Arraytype, 0, self->ob_descr);
		}
		else {
			result = newarrayobject(&Arraytype, slicelength, self->ob_descr);
			if (!result) return NULL;

			ar = (arrayobject*)result;

			for (cur = start, i = 0; i < slicelength; 
			     cur += step, i++) {
				memcpy(ar->ob_item + i*itemsize,
				       self->ob_item + cur*itemsize,
				       itemsize);
			}
			
			return result;
		}		
	}
	else {
		PyErr_SetString(PyExc_TypeError, 
				"list indices must be integers");
		return NULL;
	}
}

static int
array_ass_subscr(arrayobject* self, PyObject* item, PyObject* value)
{
	if (PyInt_Check(item)) {
		long i = PyInt_AS_LONG(item);
		if (i < 0)
			i += self->ob_size;
		return array_ass_item(self, i, value);
	}
	else if (PyLong_Check(item)) {
		long i = PyLong_AsLong(item);
		if (i == -1 && PyErr_Occurred())
			return -1;
		if (i < 0)
			i += self->ob_size;
		return array_ass_item(self, i, value);
	}
	else if (PySlice_Check(item)) {
		int start, stop, step, slicelength;
		int itemsize = self->ob_descr->itemsize;

		if (PySlice_GetIndicesEx((PySliceObject*)item, self->ob_size,
				 &start, &stop, &step, &slicelength) < 0) {
			return -1;
		}

		/* treat A[slice(a,b)] = v _exactly_ like A[a:b] = v */
		if (step == 1 && ((PySliceObject*)item)->step == Py_None)
			return array_ass_slice(self, start, stop, value);

		if (value == NULL) {
			/* delete slice */
			int cur, i, extra;
			
			if (slicelength <= 0)
				return 0;

			if (step < 0) {
				stop = start + 1;
				start = stop + step*(slicelength - 1) - 1;
				step = -step;
			}

			for (cur = start, i = 0; i < slicelength - 1;
			     cur += step, i++) {
				memmove(self->ob_item + (cur - i)*itemsize,
					self->ob_item + (cur + 1)*itemsize,
					(step - 1) * itemsize);
			}
			extra = self->ob_size - (cur + 1);
			if (extra > 0) {
				memmove(self->ob_item + (cur - i)*itemsize,
					self->ob_item + (cur + 1)*itemsize,
					extra*itemsize);
			}

			self->ob_size -= slicelength;
			self->ob_item = PyMem_REALLOC(self->ob_item, itemsize*self->ob_size);
			self->allocated = self->ob_size;

			return 0;
		}
		else {
			/* assign slice */
			int cur, i;
			arrayobject* av;

			if (!array_Check(value)) {
				PyErr_Format(PyExc_TypeError,
			     "must assign array (not \"%.200s\") to slice",
					     value->ob_type->tp_name);
				return -1;
			}

			av = (arrayobject*)value;

			if (av->ob_size != slicelength) {
				PyErr_Format(PyExc_ValueError,
            "attempt to assign array of size %d to extended slice of size %d",
					     av->ob_size, slicelength);
				return -1;
			}

			if (!slicelength)
				return 0;

			/* protect against a[::-1] = a */
			if (self == av) { 
				value = array_slice(av, 0, av->ob_size);
				av = (arrayobject*)value;
			} 
			else {
				Py_INCREF(value);
			}

			for (cur = start, i = 0; i < slicelength; 
			     cur += step, i++) {
				memcpy(self->ob_item + cur*itemsize,
				       av->ob_item + i*itemsize,
				       itemsize);
			}

			Py_DECREF(value);
			
			return 0;
		}
	} 
	else {
		PyErr_SetString(PyExc_TypeError, 
				"list indices must be integers");
		return -1;
	}
}

static PyMappingMethods array_as_mapping = {
	(inquiry)array_length,
	(binaryfunc)array_subscr,
	(objobjargproc)array_ass_subscr
};

static int
array_buffer_getreadbuf(arrayobject *self, int index, const void **ptr)
{
	if ( index != 0 ) {
		PyErr_SetString(PyExc_SystemError,
				"Accessing non-existent array segment");
		return -1;
	}
	*ptr = (void *)self->ob_item;
	return self->ob_size*self->ob_descr->itemsize;
}

static int
array_buffer_getwritebuf(arrayobject *self, int index, const void **ptr)
{
	if ( index != 0 ) {
		PyErr_SetString(PyExc_SystemError,
				"Accessing non-existent array segment");
		return -1;
	}
	*ptr = (void *)self->ob_item;
	return self->ob_size*self->ob_descr->itemsize;
}

static int
array_buffer_getsegcount(arrayobject *self, int *lenp)
{
	if ( lenp )
		*lenp = self->ob_size*self->ob_descr->itemsize;
	return 1;
}

static PySequenceMethods array_as_sequence = {
	(inquiry)array_length,		        /*sq_length*/
	(binaryfunc)array_concat,               /*sq_concat*/
	(intargfunc)array_repeat,		/*sq_repeat*/
	(intargfunc)array_item,		        /*sq_item*/
	(intintargfunc)array_slice,		/*sq_slice*/
	(intobjargproc)array_ass_item,		/*sq_ass_item*/
	(intintobjargproc)array_ass_slice,	/*sq_ass_slice*/
	(objobjproc)array_contains,		/*sq_contains*/
	(binaryfunc)array_inplace_concat,	/*sq_inplace_concat*/
	(intargfunc)array_inplace_repeat	/*sq_inplace_repeat*/
};

static PyBufferProcs array_as_buffer = {
	(getreadbufferproc)array_buffer_getreadbuf,
	(getwritebufferproc)array_buffer_getwritebuf,
	(getsegcountproc)array_buffer_getsegcount,
};

static PyObject *
array_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
	char c;
	PyObject *initial = NULL;
	struct arraydescr *descr;

	if (kwds != NULL) {
		int i = PyObject_Length(kwds);
		if (i < 0)
			return NULL;
		else if (i > 0) {
			PyErr_SetString(PyExc_TypeError,
			    "array.array constructor takes "
			    "no keyword arguments");
			return NULL;
		}
	}

	if (!PyArg_ParseTuple(args, "c|O:array", &c, &initial))
		return NULL;

	if (!(initial == NULL || PyList_Check(initial)
	      || PyString_Check(initial) || PyTuple_Check(initial)
	      || (c == 'u' && PyUnicode_Check(initial)))) {
		PyErr_SetString(PyExc_TypeError,
		    "array initializer must be list or string");
		return NULL;
	}
	for (descr = descriptors; descr->typecode != '\0'; descr++) {
		if (descr->typecode == c) {
			PyObject *a;
			int len;

			if (initial == NULL || !(PyList_Check(initial) 
				|| PyTuple_Check(initial)))
				len = 0;
			else
				len = PySequence_Size(initial);

			a = newarrayobject(type, len, descr);
			if (a == NULL)
				return NULL;

			if (len > 0) {
				int i;
				for (i = 0; i < len; i++) {
					PyObject *v =
					        PySequence_GetItem(initial, i);
					if (v == NULL) {
						Py_DECREF(a);
						return NULL;
					}
					if (setarrayitem(a, i, v) != 0) {
						Py_DECREF(v);
						Py_DECREF(a);
						return NULL;
					}
					Py_DECREF(v);
				}
			} else if (initial != NULL && PyString_Check(initial)) {
				PyObject *t_initial = PyTuple_Pack(1,
								    initial);
				PyObject *v =
					array_fromstring((arrayobject *)a,
							 t_initial);
				Py_DECREF(t_initial);
				if (v == NULL) {
					Py_DECREF(a);
					return NULL;
				}
				Py_DECREF(v);
#ifdef Py_USING_UNICODE
			} else if (initial != NULL && PyUnicode_Check(initial))  {
				int n = PyUnicode_GET_DATA_SIZE(initial);
				if (n > 0) {
					arrayobject *self = (arrayobject *)a;
					char *item = self->ob_item;
					item = PyMem_Realloc(item, n);
					if (item == NULL) {
						PyErr_NoMemory();
						Py_DECREF(a);
						return NULL;
					}
					self->ob_item = item;
					self->ob_size = n / sizeof(Py_UNICODE);
					memcpy(item, PyUnicode_AS_DATA(initial), n);
					self->allocated = self->ob_size;
				}
#endif
			}
			return a;
		}
	}
	PyErr_SetString(PyExc_ValueError,
		"bad typecode (must be c, b, B, u, h, H, i, I, l, L, f or d)");
	return NULL;
}


PyDoc_STRVAR(module_doc,
"This module defines an object type which can efficiently represent\n\
an array of basic values: characters, integers, floating point\n\
numbers.  Arrays are sequence types and behave very much like lists,\n\
except that the type of objects stored in them is constrained.  The\n\
type is specified at object creation time by using a type code, which\n\
is a single character.  The following type codes are defined:\n\
\n\
    Type code   C Type             Minimum size in bytes \n\
    'c'         character          1 \n\
    'b'         signed integer     1 \n\
    'B'         unsigned integer   1 \n\
    'u'         Unicode character  2 \n\
    'h'         signed integer     2 \n\
    'H'         unsigned integer   2 \n\
    'i'         signed integer     2 \n\
    'I'         unsigned integer   2 \n\
    'l'         signed integer     4 \n\
    'L'         unsigned integer   4 \n\
    'f'         floating point     4 \n\
    'd'         floating point     8 \n\
\n\
The constructor is:\n\
\n\
array(typecode [, initializer]) -- create a new array\n\
");

PyDoc_STRVAR(arraytype_doc,
"array(typecode [, initializer]) -> array\n\
\n\
Return a new array whose items are restricted by typecode, and\n\
initialized from the optional initializer value, which must be a list\n\
or a string.\n\
\n\
Arrays represent basic values and behave very much like lists, except\n\
the type of objects stored in them is constrained.\n\
\n\
Methods:\n\
\n\
append() -- append a new item to the end of the array\n\
buffer_info() -- return information giving the current memory info\n\
byteswap() -- byteswap all the items of the array\n\
count() -- return number of occurences of an object\n\
extend() -- extend array by appending multiple elements from an iterable\n\
fromfile() -- read items from a file object\n\
fromlist() -- append items from the list\n\
fromstring() -- append items from the string\n\
index() -- return index of first occurence of an object\n\
insert() -- insert a new item into the array at a provided position\n\
pop() -- remove and return item (default last)\n\
read() -- DEPRECATED, use fromfile()\n\
remove() -- remove first occurence of an object\n\
reverse() -- reverse the order of the items in the array\n\
tofile() -- write all items to a file object\n\
tolist() -- return the array converted to an ordinary list\n\
tostring() -- return the array converted to a string\n\
write() -- DEPRECATED, use tofile()\n\
\n\
Attributes:\n\
\n\
typecode -- the typecode character used to create the array\n\
itemsize -- the length in bytes of one array item\n\
");

static PyObject *array_iter(arrayobject *ao);

static PyTypeObject Arraytype = {
	PyObject_HEAD_INIT(NULL)
	0,
	"array.array",
	sizeof(arrayobject),
	0,
	(destructor)array_dealloc,		/* tp_dealloc */
	0,					/* tp_print */
	0,					/* tp_getattr */
	0,					/* tp_setattr */
	0,					/* tp_compare */
	(reprfunc)array_repr,			/* tp_repr */
	0,					/* tp_as _number*/
	&array_as_sequence,			/* tp_as _sequence*/
	&array_as_mapping,			/* tp_as _mapping*/
	0, 					/* tp_hash */
	0,					/* tp_call */
	0,					/* tp_str */
	PyObject_GenericGetAttr,		/* tp_getattro */
	0,					/* tp_setattro */
	&array_as_buffer,			/* tp_as_buffer*/
	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,  /* tp_flags */
	arraytype_doc,				/* tp_doc */
 	0,					/* tp_traverse */
	0,					/* tp_clear */
	array_richcompare,			/* tp_richcompare */
	0,					/* tp_weaklistoffset */
	(getiterfunc)array_iter,		/* tp_iter */
	0,					/* tp_iternext */
	array_methods,				/* tp_methods */
	0,					/* tp_members */
	array_getsets,				/* tp_getset */
	0,					/* tp_base */
	0,					/* tp_dict */
	0,					/* tp_descr_get */
	0,					/* tp_descr_set */
	0,					/* tp_dictoffset */
	0,					/* tp_init */
	PyType_GenericAlloc,			/* tp_alloc */
	array_new,				/* tp_new */
	PyObject_Del,				/* tp_free */
};


/*********************** Array Iterator **************************/

typedef struct {
	PyObject_HEAD
	long			index;
	arrayobject		*ao;
	PyObject		* (*getitem)(struct arrayobject *, int);
} arrayiterobject;

static PyTypeObject PyArrayIter_Type;

#define PyArrayIter_Check(op) PyObject_TypeCheck(op, &PyArrayIter_Type)

static PyObject *
array_iter(arrayobject *ao)
{
	arrayiterobject *it;

	if (!array_Check(ao)) {
		PyErr_BadInternalCall();
		return NULL;
	}

	it = PyObject_GC_New(arrayiterobject, &PyArrayIter_Type);
	if (it == NULL)
		return NULL;

	Py_INCREF(ao);
	it->ao = ao;
	it->index = 0;
	it->getitem = ao->ob_descr->getitem;
	PyObject_GC_Track(it);
	return (PyObject *)it;
}

static PyObject *
arrayiter_next(arrayiterobject *it)
{
	assert(PyArrayIter_Check(it));
	if (it->index < it->ao->ob_size)
		return (*it->getitem)(it->ao, it->index++);
	return NULL;
}

static void
arrayiter_dealloc(arrayiterobject *it)
{
	PyObject_GC_UnTrack(it);
	Py_XDECREF(it->ao);
	PyObject_GC_Del(it);
}

static int
arrayiter_traverse(arrayiterobject *it, visitproc visit, void *arg)
{
	if (it->ao != NULL)
		return visit((PyObject *)(it->ao), arg);
	return 0;
}

static PyTypeObject PyArrayIter_Type = {
	PyObject_HEAD_INIT(NULL)
	0,                                      /* ob_size */
	"arrayiterator",                        /* tp_name */
	sizeof(arrayiterobject),                /* tp_basicsize */
	0,                                      /* tp_itemsize */
	/* methods */
	(destructor)arrayiter_dealloc,		/* tp_dealloc */
	0,                                      /* tp_print */
	0,                                      /* tp_getattr */
	0,                                      /* tp_setattr */
	0,                                      /* tp_compare */
	0,                                      /* tp_repr */
	0,                                      /* tp_as_number */
	0,                                      /* tp_as_sequence */
	0,                                      /* tp_as_mapping */
	0,                                      /* tp_hash */
	0,                                      /* tp_call */
	0,                                      /* tp_str */
	PyObject_GenericGetAttr,                /* tp_getattro */
	0,                                      /* tp_setattro */
	0,                                      /* tp_as_buffer */
	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
	0,                                      /* tp_doc */
	(traverseproc)arrayiter_traverse,	/* tp_traverse */
	0,					/* tp_clear */
	0,                                      /* tp_richcompare */
	0,                                      /* tp_weaklistoffset */
	PyObject_SelfIter,			/* tp_iter */
	(iternextfunc)arrayiter_next,		/* tp_iternext */
	0,					/* tp_methods */
};


/*********************** Install Module **************************/

/* No functions in array module. */
static PyMethodDef a_methods[] = {
    {NULL, NULL, 0, NULL}        /* Sentinel */
};


PyMODINIT_FUNC
initarray(void)
{
	PyObject *m;

	Arraytype.ob_type = &PyType_Type;
	PyArrayIter_Type.ob_type = &PyType_Type;
	m = Py_InitModule3("array", a_methods, module_doc);

        Py_INCREF((PyObject *)&Arraytype);
	PyModule_AddObject(m, "ArrayType", (PyObject *)&Arraytype);
        Py_INCREF((PyObject *)&Arraytype);
	PyModule_AddObject(m, "array", (PyObject *)&Arraytype);
	/* No need to check the error here, the caller will do that */
}