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Remove an unnecessary check from test_decimal.
[python.git] / Modules / arraymodule.c
blobbcd82aa977a72fcfff0a8af2d9fc22d621e793fb
1 /* Array object implementation */
2
3 /* An array is a uniform list -- all items have the same type.
4 The item type is restricted to simple C types like int or float */
5
6 #define PY_SSIZE_T_CLEAN
7 #include "Python.h"
8 #include "structmember.h"
9
10 #ifdef STDC_HEADERS
11 #include <stddef.h>
12 #else /* !STDC_HEADERS */
13 #ifdef HAVE_SYS_TYPES_H
14 #include <sys/types.h> /* For size_t */
15 #endif /* HAVE_SYS_TYPES_H */
16 #endif /* !STDC_HEADERS */
17
18 struct arrayobject; /* Forward */
19
20 /* All possible arraydescr values are defined in the vector "descriptors"
21 * below. That's defined later because the appropriate get and set
22 * functions aren't visible yet.
23 */
24 struct arraydescr {
25 int typecode;
26 int itemsize;
27 PyObject * (*getitem)(struct arrayobject *, Py_ssize_t);
28 int (*setitem)(struct arrayobject *, Py_ssize_t, PyObject *);
29 };
30
31 typedef struct arrayobject {
32 PyObject_VAR_HEAD
33 char *ob_item;
34 Py_ssize_t allocated;
35 struct arraydescr *ob_descr;
36 PyObject *weakreflist; /* List of weak references */
37 } arrayobject;
38
39 static PyTypeObject Arraytype;
40
41 #define array_Check(op) PyObject_TypeCheck(op, &Arraytype)
42 #define array_CheckExact(op) (Py_TYPE(op) == &Arraytype)
43
44 static int
45 array_resize(arrayobject *self, Py_ssize_t newsize)
46 {
47 char *items;
48 size_t _new_size;
49
50 /* Bypass realloc() when a previous overallocation is large enough
51 to accommodate the newsize. If the newsize is 16 smaller than the
52 current size, then proceed with the realloc() to shrink the list.
53 */
54
55 if (self->allocated >= newsize &&
56 Py_SIZE(self) < newsize + 16 &&
57 self->ob_item != NULL) {
58 Py_SIZE(self) = newsize;
59 return 0;
60 }
61
62 /* This over-allocates proportional to the array size, making room
63 * for additional growth. The over-allocation is mild, but is
64 * enough to give linear-time amortized behavior over a long
65 * sequence of appends() in the presence of a poorly-performing
66 * system realloc().
67 * The growth pattern is: 0, 4, 8, 16, 25, 34, 46, 56, 67, 79, ...
68 * Note, the pattern starts out the same as for lists but then
69 * grows at a smaller rate so that larger arrays only overallocate
70 * by about 1/16th -- this is done because arrays are presumed to be more
71 * memory critical.
72 */
73
74 _new_size = (newsize >> 4) + (Py_SIZE(self) < 8 ? 3 : 7) + newsize;
75 items = self->ob_item;
76 /* XXX The following multiplication and division does not optimize away
77 like it does for lists since the size is not known at compile time */
78 if (_new_size <= ((~(size_t)0) / self->ob_descr->itemsize))
79 PyMem_RESIZE(items, char, (_new_size * self->ob_descr->itemsize));
80 else
81 items = NULL;
82 if (items == NULL) {
83 PyErr_NoMemory();
84 return -1;
85 }
86 self->ob_item = items;
87 Py_SIZE(self) = newsize;
88 self->allocated = _new_size;
89 return 0;
90 }
91
92 /****************************************************************************
93 Get and Set functions for each type.
94 A Get function takes an arrayobject* and an integer index, returning the
95 array value at that index wrapped in an appropriate PyObject*.
96 A Set function takes an arrayobject, integer index, and PyObject*; sets
97 the array value at that index to the raw C data extracted from the PyObject*,
98 and returns 0 if successful, else nonzero on failure (PyObject* not of an
99 appropriate type or value).
100 Note that the basic Get and Set functions do NOT check that the index is
101 in bounds; that's the responsibility of the caller.
102 ****************************************************************************/
103
104 static PyObject *
105 c_getitem(arrayobject *ap, Py_ssize_t i)
106 {
107 return PyString_FromStringAndSize(&((char *)ap->ob_item)[i], 1);
108 }
109
110 static int
111 c_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
112 {
113 char x;
114 if (!PyArg_Parse(v, "c;array item must be char", &x))
115 return -1;
116 if (i >= 0)
117 ((char *)ap->ob_item)[i] = x;
118 return 0;
119 }
120
121 static PyObject *
122 b_getitem(arrayobject *ap, Py_ssize_t i)
123 {
124 long x = ((char *)ap->ob_item)[i];
125 if (x >= 128)
126 x -= 256;
127 return PyInt_FromLong(x);
128 }
129
130 static int
131 b_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
132 {
133 short x;
134 /* PyArg_Parse's 'b' formatter is for an unsigned char, therefore
135 must use the next size up that is signed ('h') and manually do
136 the overflow checking */
137 if (!PyArg_Parse(v, "h;array item must be integer", &x))
138 return -1;
139 else if (x < -128) {
140 PyErr_SetString(PyExc_OverflowError,
141 "signed char is less than minimum");
142 return -1;
143 }
144 else if (x > 127) {
145 PyErr_SetString(PyExc_OverflowError,
146 "signed char is greater than maximum");
147 return -1;
148 }
149 if (i >= 0)
150 ((char *)ap->ob_item)[i] = (char)x;
151 return 0;
152 }
153
154 static PyObject *
155 BB_getitem(arrayobject *ap, Py_ssize_t i)
156 {
157 long x = ((unsigned char *)ap->ob_item)[i];
158 return PyInt_FromLong(x);
159 }
160
161 static int
162 BB_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
163 {
164 unsigned char x;
165 /* 'B' == unsigned char, maps to PyArg_Parse's 'b' formatter */
166 if (!PyArg_Parse(v, "b;array item must be integer", &x))
167 return -1;
168 if (i >= 0)
169 ((char *)ap->ob_item)[i] = x;
170 return 0;
171 }
172
173 #ifdef Py_USING_UNICODE
174 static PyObject *
175 u_getitem(arrayobject *ap, Py_ssize_t i)
176 {
177 return PyUnicode_FromUnicode(&((Py_UNICODE *) ap->ob_item)[i], 1);
178 }
179
180 static int
181 u_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
182 {
183 Py_UNICODE *p;
184 Py_ssize_t len;
185
186 if (!PyArg_Parse(v, "u#;array item must be unicode character", &p, &len))
187 return -1;
188 if (len != 1) {
189 PyErr_SetString(PyExc_TypeError,
190 "array item must be unicode character");
191 return -1;
192 }
193 if (i >= 0)
194 ((Py_UNICODE *)ap->ob_item)[i] = p[0];
195 return 0;
196 }
197 #endif
198
199 static PyObject *
200 h_getitem(arrayobject *ap, Py_ssize_t i)
201 {
202 return PyInt_FromLong((long) ((short *)ap->ob_item)[i]);
203 }
204
205 static int
206 h_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
207 {
208 short x;
209 /* 'h' == signed short, maps to PyArg_Parse's 'h' formatter */
210 if (!PyArg_Parse(v, "h;array item must be integer", &x))
211 return -1;
212 if (i >= 0)
213 ((short *)ap->ob_item)[i] = x;
214 return 0;
215 }
216
217 static PyObject *
218 HH_getitem(arrayobject *ap, Py_ssize_t i)
219 {
220 return PyInt_FromLong((long) ((unsigned short *)ap->ob_item)[i]);
221 }
222
223 static int
224 HH_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
225 {
226 int x;
227 /* PyArg_Parse's 'h' formatter is for a signed short, therefore
228 must use the next size up and manually do the overflow checking */
229 if (!PyArg_Parse(v, "i;array item must be integer", &x))
230 return -1;
231 else if (x < 0) {
232 PyErr_SetString(PyExc_OverflowError,
233 "unsigned short is less than minimum");
234 return -1;
235 }
236 else if (x > USHRT_MAX) {
237 PyErr_SetString(PyExc_OverflowError,
238 "unsigned short is greater than maximum");
239 return -1;
240 }
241 if (i >= 0)
242 ((short *)ap->ob_item)[i] = (short)x;
243 return 0;
244 }
245
246 static PyObject *
247 i_getitem(arrayobject *ap, Py_ssize_t i)
248 {
249 return PyInt_FromLong((long) ((int *)ap->ob_item)[i]);
250 }
251
252 static int
253 i_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
254 {
255 int x;
256 /* 'i' == signed int, maps to PyArg_Parse's 'i' formatter */
257 if (!PyArg_Parse(v, "i;array item must be integer", &x))
258 return -1;
259 if (i >= 0)
260 ((int *)ap->ob_item)[i] = x;
261 return 0;
262 }
263
264 static PyObject *
265 II_getitem(arrayobject *ap, Py_ssize_t i)
266 {
267 return PyLong_FromUnsignedLong(
268 (unsigned long) ((unsigned int *)ap->ob_item)[i]);
269 }
270
271 static int
272 II_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
273 {
274 unsigned long x;
275 if (PyLong_Check(v)) {
276 x = PyLong_AsUnsignedLong(v);
277 if (x == (unsigned long) -1 && PyErr_Occurred())
278 return -1;
279 }
280 else {
281 long y;
282 if (!PyArg_Parse(v, "l;array item must be integer", &y))
283 return -1;
284 if (y < 0) {
285 PyErr_SetString(PyExc_OverflowError,
286 "unsigned int is less than minimum");
287 return -1;
288 }
289 x = (unsigned long)y;
290
291 }
292 if (x > UINT_MAX) {
293 PyErr_SetString(PyExc_OverflowError,
294 "unsigned int is greater than maximum");
295 return -1;
296 }
297
298 if (i >= 0)
299 ((unsigned int *)ap->ob_item)[i] = (unsigned int)x;
300 return 0;
301 }
302
303 static PyObject *
304 l_getitem(arrayobject *ap, Py_ssize_t i)
305 {
306 return PyInt_FromLong(((long *)ap->ob_item)[i]);
307 }
308
309 static int
310 l_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
311 {
312 long x;
313 if (!PyArg_Parse(v, "l;array item must be integer", &x))
314 return -1;
315 if (i >= 0)
316 ((long *)ap->ob_item)[i] = x;
317 return 0;
318 }
319
320 static PyObject *
321 LL_getitem(arrayobject *ap, Py_ssize_t i)
322 {
323 return PyLong_FromUnsignedLong(((unsigned long *)ap->ob_item)[i]);
324 }
325
326 static int
327 LL_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
328 {
329 unsigned long x;
330 if (PyLong_Check(v)) {
331 x = PyLong_AsUnsignedLong(v);
332 if (x == (unsigned long) -1 && PyErr_Occurred())
333 return -1;
334 }
335 else {
336 long y;
337 if (!PyArg_Parse(v, "l;array item must be integer", &y))
338 return -1;
339 if (y < 0) {
340 PyErr_SetString(PyExc_OverflowError,
341 "unsigned long is less than minimum");
342 return -1;
343 }
344 x = (unsigned long)y;
345
346 }
347 if (x > ULONG_MAX) {
348 PyErr_SetString(PyExc_OverflowError,
349 "unsigned long is greater than maximum");
350 return -1;
351 }
352
353 if (i >= 0)
354 ((unsigned long *)ap->ob_item)[i] = x;
355 return 0;
356 }
357
358 static PyObject *
359 f_getitem(arrayobject *ap, Py_ssize_t i)
360 {
361 return PyFloat_FromDouble((double) ((float *)ap->ob_item)[i]);
362 }
363
364 static int
365 f_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
366 {
367 float x;
368 if (!PyArg_Parse(v, "f;array item must be float", &x))
369 return -1;
370 if (i >= 0)
371 ((float *)ap->ob_item)[i] = x;
372 return 0;
373 }
374
375 static PyObject *
376 d_getitem(arrayobject *ap, Py_ssize_t i)
377 {
378 return PyFloat_FromDouble(((double *)ap->ob_item)[i]);
379 }
380
381 static int
382 d_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
383 {
384 double x;
385 if (!PyArg_Parse(v, "d;array item must be float", &x))
386 return -1;
387 if (i >= 0)
388 ((double *)ap->ob_item)[i] = x;
389 return 0;
390 }
391
392 /* Description of types */
393 static struct arraydescr descriptors[] = {
394 {'c', sizeof(char), c_getitem, c_setitem},
395 {'b', sizeof(char), b_getitem, b_setitem},
396 {'B', sizeof(char), BB_getitem, BB_setitem},
397 #ifdef Py_USING_UNICODE
398 {'u', sizeof(Py_UNICODE), u_getitem, u_setitem},
399 #endif
400 {'h', sizeof(short), h_getitem, h_setitem},
401 {'H', sizeof(short), HH_getitem, HH_setitem},
402 {'i', sizeof(int), i_getitem, i_setitem},
403 {'I', sizeof(int), II_getitem, II_setitem},
404 {'l', sizeof(long), l_getitem, l_setitem},
405 {'L', sizeof(long), LL_getitem, LL_setitem},
406 {'f', sizeof(float), f_getitem, f_setitem},
407 {'d', sizeof(double), d_getitem, d_setitem},
408 {'\0', 0, 0, 0} /* Sentinel */
409 };
410
411 /****************************************************************************
412 Implementations of array object methods.
413 ****************************************************************************/
414
415 static PyObject *
416 newarrayobject(PyTypeObject *type, Py_ssize_t size, struct arraydescr *descr)
417 {
418 arrayobject *op;
419 size_t nbytes;
420
421 if (size < 0) {
422 PyErr_BadInternalCall();
423 return NULL;
424 }
425
426 nbytes = size * descr->itemsize;
427 /* Check for overflow */
428 if (nbytes / descr->itemsize != (size_t)size) {
429 return PyErr_NoMemory();
430 }
431 op = (arrayobject *) type->tp_alloc(type, 0);
432 if (op == NULL) {
433 return NULL;
434 }
435 op->ob_descr = descr;
436 op->allocated = size;
437 op->weakreflist = NULL;
438 Py_SIZE(op) = size;
439 if (size <= 0) {
440 op->ob_item = NULL;
441 }
442 else {
443 op->ob_item = PyMem_NEW(char, nbytes);
444 if (op->ob_item == NULL) {
445 Py_DECREF(op);
446 return PyErr_NoMemory();
447 }
448 }
449 return (PyObject *) op;
450 }
451
452 static PyObject *
453 getarrayitem(PyObject *op, Py_ssize_t i)
454 {
455 register arrayobject *ap;
456 assert(array_Check(op));
457 ap = (arrayobject *)op;
458 assert(i>=0 && i<Py_SIZE(ap));
459 return (*ap->ob_descr->getitem)(ap, i);
460 }
461
462 static int
463 ins1(arrayobject *self, Py_ssize_t where, PyObject *v)
464 {
465 char *items;
466 Py_ssize_t n = Py_SIZE(self);
467 if (v == NULL) {
468 PyErr_BadInternalCall();
469 return -1;
470 }
471 if ((*self->ob_descr->setitem)(self, -1, v) < 0)
472 return -1;
473
474 if (array_resize(self, n+1) == -1)
475 return -1;
476 items = self->ob_item;
477 if (where < 0) {
478 where += n;
479 if (where < 0)
480 where = 0;
481 }
482 if (where > n)
483 where = n;
484 /* appends don't need to call memmove() */
485 if (where != n)
486 memmove(items + (where+1)*self->ob_descr->itemsize,
487 items + where*self->ob_descr->itemsize,
488 (n-where)*self->ob_descr->itemsize);
489 return (*self->ob_descr->setitem)(self, where, v);
490 }
491
492 /* Methods */
493
494 static void
495 array_dealloc(arrayobject *op)
496 {
497 if (op->weakreflist != NULL)
498 PyObject_ClearWeakRefs((PyObject *) op);
499 if (op->ob_item != NULL)
500 PyMem_DEL(op->ob_item);
501 Py_TYPE(op)->tp_free((PyObject *)op);
502 }
503
504 static PyObject *
505 array_richcompare(PyObject *v, PyObject *w, int op)
506 {
507 arrayobject *va, *wa;
508 PyObject *vi = NULL;
509 PyObject *wi = NULL;
510 Py_ssize_t i, k;
511 PyObject *res;
512
513 if (!array_Check(v) || !array_Check(w)) {
514 Py_INCREF(Py_NotImplemented);
515 return Py_NotImplemented;
516 }
517
518 va = (arrayobject *)v;
519 wa = (arrayobject *)w;
520
521 if (Py_SIZE(va) != Py_SIZE(wa) && (op == Py_EQ || op == Py_NE)) {
522 /* Shortcut: if the lengths differ, the arrays differ */
523 if (op == Py_EQ)
524 res = Py_False;
525 else
526 res = Py_True;
527 Py_INCREF(res);
528 return res;
529 }
530
531 /* Search for the first index where items are different */
532 k = 1;
533 for (i = 0; i < Py_SIZE(va) && i < Py_SIZE(wa); i++) {
534 vi = getarrayitem(v, i);
535 wi = getarrayitem(w, i);
536 if (vi == NULL || wi == NULL) {
537 Py_XDECREF(vi);
538 Py_XDECREF(wi);
539 return NULL;
540 }
541 k = PyObject_RichCompareBool(vi, wi, Py_EQ);
542 if (k == 0)
543 break; /* Keeping vi and wi alive! */
544 Py_DECREF(vi);
545 Py_DECREF(wi);
546 if (k < 0)
547 return NULL;
548 }
549
550 if (k) {
551 /* No more items to compare -- compare sizes */
552 Py_ssize_t vs = Py_SIZE(va);
553 Py_ssize_t ws = Py_SIZE(wa);
554 int cmp;
555 switch (op) {
556 case Py_LT: cmp = vs < ws; break;
557 case Py_LE: cmp = vs <= ws; break;
558 case Py_EQ: cmp = vs == ws; break;
559 case Py_NE: cmp = vs != ws; break;
560 case Py_GT: cmp = vs > ws; break;
561 case Py_GE: cmp = vs >= ws; break;
562 default: return NULL; /* cannot happen */
563 }
564 if (cmp)
565 res = Py_True;
566 else
567 res = Py_False;
568 Py_INCREF(res);
569 return res;
570 }
571
572 /* We have an item that differs. First, shortcuts for EQ/NE */
573 if (op == Py_EQ) {
574 Py_INCREF(Py_False);
575 res = Py_False;
576 }
577 else if (op == Py_NE) {
578 Py_INCREF(Py_True);
579 res = Py_True;
580 }
581 else {
582 /* Compare the final item again using the proper operator */
583 res = PyObject_RichCompare(vi, wi, op);
584 }
585 Py_DECREF(vi);
586 Py_DECREF(wi);
587 return res;
588 }
589
590 static Py_ssize_t
591 array_length(arrayobject *a)
592 {
593 return Py_SIZE(a);
594 }
595
596 static PyObject *
597 array_item(arrayobject *a, Py_ssize_t i)
598 {
599 if (i < 0 || i >= Py_SIZE(a)) {
600 PyErr_SetString(PyExc_IndexError, "array index out of range");
601 return NULL;
602 }
603 return getarrayitem((PyObject *)a, i);
604 }
605
606 static PyObject *
607 array_slice(arrayobject *a, Py_ssize_t ilow, Py_ssize_t ihigh)
608 {
609 arrayobject *np;
610 if (ilow < 0)
611 ilow = 0;
612 else if (ilow > Py_SIZE(a))
613 ilow = Py_SIZE(a);
614 if (ihigh < 0)
615 ihigh = 0;
616 if (ihigh < ilow)
617 ihigh = ilow;
618 else if (ihigh > Py_SIZE(a))
619 ihigh = Py_SIZE(a);
620 np = (arrayobject *) newarrayobject(&Arraytype, ihigh - ilow, a->ob_descr);
621 if (np == NULL)
622 return NULL;
623 memcpy(np->ob_item, a->ob_item + ilow * a->ob_descr->itemsize,
624 (ihigh-ilow) * a->ob_descr->itemsize);
625 return (PyObject *)np;
626 }
627
628 static PyObject *
629 array_copy(arrayobject *a, PyObject *unused)
630 {
631 return array_slice(a, 0, Py_SIZE(a));
632 }
633
634 PyDoc_STRVAR(copy_doc,
635 "copy(array)\n\
636 \n\
637 Return a copy of the array.");
638
639 static PyObject *
640 array_concat(arrayobject *a, PyObject *bb)
641 {
642 Py_ssize_t size;
643 arrayobject *np;
644 if (!array_Check(bb)) {
645 PyErr_Format(PyExc_TypeError,
646 "can only append array (not \"%.200s\") to array",
647 Py_TYPE(bb)->tp_name);
648 return NULL;
649 }
650 #define b ((arrayobject *)bb)
651 if (a->ob_descr != b->ob_descr) {
652 PyErr_BadArgument();
653 return NULL;
654 }
655 if (Py_SIZE(a) > PY_SSIZE_T_MAX - Py_SIZE(b)) {
656 return PyErr_NoMemory();
657 }
658 size = Py_SIZE(a) + Py_SIZE(b);
659 np = (arrayobject *) newarrayobject(&Arraytype, size, a->ob_descr);
660 if (np == NULL) {
661 return NULL;
662 }
663 memcpy(np->ob_item, a->ob_item, Py_SIZE(a)*a->ob_descr->itemsize);
664 memcpy(np->ob_item + Py_SIZE(a)*a->ob_descr->itemsize,
665 b->ob_item, Py_SIZE(b)*b->ob_descr->itemsize);
666 return (PyObject *)np;
667 #undef b
668 }
669
670 static PyObject *
671 array_repeat(arrayobject *a, Py_ssize_t n)
672 {
673 Py_ssize_t i;
674 Py_ssize_t size;
675 arrayobject *np;
676 char *p;
677 Py_ssize_t nbytes;
678 if (n < 0)
679 n = 0;
680 if ((Py_SIZE(a) != 0) && (n > PY_SSIZE_T_MAX / Py_SIZE(a))) {
681 return PyErr_NoMemory();
682 }
683 size = Py_SIZE(a) * n;
684 np = (arrayobject *) newarrayobject(&Arraytype, size, a->ob_descr);
685 if (np == NULL)
686 return NULL;
687 p = np->ob_item;
688 nbytes = Py_SIZE(a) * a->ob_descr->itemsize;
689 for (i = 0; i < n; i++) {
690 memcpy(p, a->ob_item, nbytes);
691 p += nbytes;
692 }
693 return (PyObject *) np;
694 }
695
696 static int
697 array_ass_slice(arrayobject *a, Py_ssize_t ilow, Py_ssize_t ihigh, PyObject *v)
698 {
699 char *item;
700 Py_ssize_t n; /* Size of replacement array */
701 Py_ssize_t d; /* Change in size */
702 #define b ((arrayobject *)v)
703 if (v == NULL)
704 n = 0;
705 else if (array_Check(v)) {
706 n = Py_SIZE(b);
707 if (a == b) {
708 /* Special case "a[i:j] = a" -- copy b first */
709 int ret;
710 v = array_slice(b, 0, n);
711 if (!v)
712 return -1;
713 ret = array_ass_slice(a, ilow, ihigh, v);
714 Py_DECREF(v);
715 return ret;
716 }
717 if (b->ob_descr != a->ob_descr) {
718 PyErr_BadArgument();
719 return -1;
720 }
721 }
722 else {
723 PyErr_Format(PyExc_TypeError,
724 "can only assign array (not \"%.200s\") to array slice",
725 Py_TYPE(v)->tp_name);
726 return -1;
727 }
728 if (ilow < 0)
729 ilow = 0;
730 else if (ilow > Py_SIZE(a))
731 ilow = Py_SIZE(a);
732 if (ihigh < 0)
733 ihigh = 0;
734 if (ihigh < ilow)
735 ihigh = ilow;
736 else if (ihigh > Py_SIZE(a))
737 ihigh = Py_SIZE(a);
738 item = a->ob_item;
739 d = n - (ihigh-ilow);
740 if (d < 0) { /* Delete -d items */
741 memmove(item + (ihigh+d)*a->ob_descr->itemsize,
742 item + ihigh*a->ob_descr->itemsize,
743 (Py_SIZE(a)-ihigh)*a->ob_descr->itemsize);
744 Py_SIZE(a) += d;
745 PyMem_RESIZE(item, char, Py_SIZE(a)*a->ob_descr->itemsize);
746 /* Can't fail */
747 a->ob_item = item;
748 a->allocated = Py_SIZE(a);
749 }
750 else if (d > 0) { /* Insert d items */
751 PyMem_RESIZE(item, char,
752 (Py_SIZE(a) + d)*a->ob_descr->itemsize);
753 if (item == NULL) {
754 PyErr_NoMemory();
755 return -1;
756 }
757 memmove(item + (ihigh+d)*a->ob_descr->itemsize,
758 item + ihigh*a->ob_descr->itemsize,
759 (Py_SIZE(a)-ihigh)*a->ob_descr->itemsize);
760 a->ob_item = item;
761 Py_SIZE(a) += d;
762 a->allocated = Py_SIZE(a);
763 }
764 if (n > 0)
765 memcpy(item + ilow*a->ob_descr->itemsize, b->ob_item,
766 n*b->ob_descr->itemsize);
767 return 0;
768 #undef b
769 }
770
771 static int
772 array_ass_item(arrayobject *a, Py_ssize_t i, PyObject *v)
773 {
774 if (i < 0 || i >= Py_SIZE(a)) {
775 PyErr_SetString(PyExc_IndexError,
776 "array assignment index out of range");
777 return -1;
778 }
779 if (v == NULL)
780 return array_ass_slice(a, i, i+1, v);
781 return (*a->ob_descr->setitem)(a, i, v);
782 }
783
784 static int
785 setarrayitem(PyObject *a, Py_ssize_t i, PyObject *v)
786 {
787 assert(array_Check(a));
788 return array_ass_item((arrayobject *)a, i, v);
789 }
790
791 static int
792 array_iter_extend(arrayobject *self, PyObject *bb)
793 {
794 PyObject *it, *v;
795
796 it = PyObject_GetIter(bb);
797 if (it == NULL)
798 return -1;
799
800 while ((v = PyIter_Next(it)) != NULL) {
801 if (ins1(self, (int) Py_SIZE(self), v) != 0) {
802 Py_DECREF(v);
803 Py_DECREF(it);
804 return -1;
805 }
806 Py_DECREF(v);
807 }
808 Py_DECREF(it);
809 if (PyErr_Occurred())
810 return -1;
811 return 0;
812 }
813
814 static int
815 array_do_extend(arrayobject *self, PyObject *bb)
816 {
817 Py_ssize_t size;
818 char *old_item;
819
820 if (!array_Check(bb))
821 return array_iter_extend(self, bb);
822 #define b ((arrayobject *)bb)
823 if (self->ob_descr != b->ob_descr) {
824 PyErr_SetString(PyExc_TypeError,
825 "can only extend with array of same kind");
826 return -1;
827 }
828 if ((Py_SIZE(self) > PY_SSIZE_T_MAX - Py_SIZE(b)) ||
829 ((Py_SIZE(self) + Py_SIZE(b)) > PY_SSIZE_T_MAX / self->ob_descr->itemsize)) {
830 PyErr_NoMemory();
831 return -1;
832 }
833 size = Py_SIZE(self) + Py_SIZE(b);
834 old_item = self->ob_item;
835 PyMem_RESIZE(self->ob_item, char, size*self->ob_descr->itemsize);
836 if (self->ob_item == NULL) {
837 self->ob_item = old_item;
838 PyErr_NoMemory();
839 return -1;
840 }
841 memcpy(self->ob_item + Py_SIZE(self)*self->ob_descr->itemsize,
842 b->ob_item, Py_SIZE(b)*b->ob_descr->itemsize);
843 Py_SIZE(self) = size;
844 self->allocated = size;
845
846 return 0;
847 #undef b
848 }
849
850 static PyObject *
851 array_inplace_concat(arrayobject *self, PyObject *bb)
852 {
853 if (!array_Check(bb)) {
854 PyErr_Format(PyExc_TypeError,
855 "can only extend array with array (not \"%.200s\")",
856 Py_TYPE(bb)->tp_name);
857 return NULL;
858 }
859 if (array_do_extend(self, bb) == -1)
860 return NULL;
861 Py_INCREF(self);
862 return (PyObject *)self;
863 }
864
865 static PyObject *
866 array_inplace_repeat(arrayobject *self, Py_ssize_t n)
867 {
868 char *items, *p;
869 Py_ssize_t size, i;
870
871 if (Py_SIZE(self) > 0) {
872 if (n < 0)
873 n = 0;
874 items = self->ob_item;
875 if ((self->ob_descr->itemsize != 0) &&
876 (Py_SIZE(self) > PY_SSIZE_T_MAX / self->ob_descr->itemsize)) {
877 return PyErr_NoMemory();
878 }
879 size = Py_SIZE(self) * self->ob_descr->itemsize;
880 if (n == 0) {
881 PyMem_FREE(items);
882 self->ob_item = NULL;
883 Py_SIZE(self) = 0;
884 self->allocated = 0;
885 }
886 else {
887 if (size > PY_SSIZE_T_MAX / n) {
888 return PyErr_NoMemory();
889 }
890 PyMem_RESIZE(items, char, n * size);
891 if (items == NULL)
892 return PyErr_NoMemory();
893 p = items;
894 for (i = 1; i < n; i++) {
895 p += size;
896 memcpy(p, items, size);
897 }
898 self->ob_item = items;
899 Py_SIZE(self) *= n;
900 self->allocated = Py_SIZE(self);
901 }
902 }
903 Py_INCREF(self);
904 return (PyObject *)self;
905 }
906
907
908 static PyObject *
909 ins(arrayobject *self, Py_ssize_t where, PyObject *v)
910 {
911 if (ins1(self, where, v) != 0)
912 return NULL;
913 Py_INCREF(Py_None);
914 return Py_None;
915 }
916
917 static PyObject *
918 array_count(arrayobject *self, PyObject *v)
919 {
920 Py_ssize_t count = 0;
921 Py_ssize_t i;
922
923 for (i = 0; i < Py_SIZE(self); i++) {
924 PyObject *selfi = getarrayitem((PyObject *)self, i);
925 int cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
926 Py_DECREF(selfi);
927 if (cmp > 0)
928 count++;
929 else if (cmp < 0)
930 return NULL;
931 }
932 return PyInt_FromSsize_t(count);
933 }
934
935 PyDoc_STRVAR(count_doc,
936 "count(x)\n\
937 \n\
938 Return number of occurences of x in the array.");
939
940 static PyObject *
941 array_index(arrayobject *self, PyObject *v)
942 {
943 Py_ssize_t i;
944
945 for (i = 0; i < Py_SIZE(self); i++) {
946 PyObject *selfi = getarrayitem((PyObject *)self, i);
947 int cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
948 Py_DECREF(selfi);
949 if (cmp > 0) {
950 return PyInt_FromLong((long)i);
951 }
952 else if (cmp < 0)
953 return NULL;
954 }
955 PyErr_SetString(PyExc_ValueError, "array.index(x): x not in list");
956 return NULL;
957 }
958
959 PyDoc_STRVAR(index_doc,
960 "index(x)\n\
961 \n\
962 Return index of first occurence of x in the array.");
963
964 static int
965 array_contains(arrayobject *self, PyObject *v)
966 {
967 Py_ssize_t i;
968 int cmp;
969
970 for (i = 0, cmp = 0 ; cmp == 0 && i < Py_SIZE(self); i++) {
971 PyObject *selfi = getarrayitem((PyObject *)self, i);
972 cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
973 Py_DECREF(selfi);
974 }
975 return cmp;
976 }
977
978 static PyObject *
979 array_remove(arrayobject *self, PyObject *v)
980 {
981 int i;
982
983 for (i = 0; i < Py_SIZE(self); i++) {
984 PyObject *selfi = getarrayitem((PyObject *)self,i);
985 int cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
986 Py_DECREF(selfi);
987 if (cmp > 0) {
988 if (array_ass_slice(self, i, i+1,
989 (PyObject *)NULL) != 0)
990 return NULL;
991 Py_INCREF(Py_None);
992 return Py_None;
993 }
994 else if (cmp < 0)
995 return NULL;
996 }
997 PyErr_SetString(PyExc_ValueError, "array.remove(x): x not in list");
998 return NULL;
999 }
1000
1001 PyDoc_STRVAR(remove_doc,
1002 "remove(x)\n\
1003 \n\
1004 Remove the first occurence of x in the array.");
1005
1006 static PyObject *
1007 array_pop(arrayobject *self, PyObject *args)
1008 {
1009 Py_ssize_t i = -1;
1010 PyObject *v;
1011 if (!PyArg_ParseTuple(args, "|n:pop", &i))
1012 return NULL;
1013 if (Py_SIZE(self) == 0) {
1014 /* Special-case most common failure cause */
1015 PyErr_SetString(PyExc_IndexError, "pop from empty array");
1016 return NULL;
1017 }
1018 if (i < 0)
1019 i += Py_SIZE(self);
1020 if (i < 0 || i >= Py_SIZE(self)) {
1021 PyErr_SetString(PyExc_IndexError, "pop index out of range");
1022 return NULL;
1023 }
1024 v = getarrayitem((PyObject *)self,i);
1025 if (array_ass_slice(self, i, i+1, (PyObject *)NULL) != 0) {
1026 Py_DECREF(v);
1027 return NULL;
1028 }
1029 return v;
1030 }
1031
1032 PyDoc_STRVAR(pop_doc,
1033 "pop([i])\n\
1034 \n\
1035 Return the i-th element and delete it from the array. i defaults to -1.");
1036
1037 static PyObject *
1038 array_extend(arrayobject *self, PyObject *bb)
1039 {
1040 if (array_do_extend(self, bb) == -1)
1041 return NULL;
1042 Py_INCREF(Py_None);
1043 return Py_None;
1044 }
1045
1046 PyDoc_STRVAR(extend_doc,
1047 "extend(array or iterable)\n\
1048 \n\
1049 Append items to the end of the array.");
1050
1051 static PyObject *
1052 array_insert(arrayobject *self, PyObject *args)
1053 {
1054 Py_ssize_t i;
1055 PyObject *v;
1056 if (!PyArg_ParseTuple(args, "nO:insert", &i, &v))
1057 return NULL;
1058 return ins(self, i, v);
1059 }
1060
1061 PyDoc_STRVAR(insert_doc,
1062 "insert(i,x)\n\
1063 \n\
1064 Insert a new item x into the array before position i.");
1065
1066
1067 static PyObject *
1068 array_buffer_info(arrayobject *self, PyObject *unused)
1069 {
1070 PyObject* retval = NULL;
1071 retval = PyTuple_New(2);
1072 if (!retval)
1073 return NULL;
1074
1075 PyTuple_SET_ITEM(retval, 0, PyLong_FromVoidPtr(self->ob_item));
1076 PyTuple_SET_ITEM(retval, 1, PyInt_FromLong((long)(Py_SIZE(self))));
1077
1078 return retval;
1079 }
1080
1081 PyDoc_STRVAR(buffer_info_doc,
1082 "buffer_info() -> (address, length)\n\
1083 \n\
1084 Return a tuple (address, length) giving the current memory address and\n\
1085 the length in items of the buffer used to hold array's contents\n\
1086 The length should be multiplied by the itemsize attribute to calculate\n\
1087 the buffer length in bytes.");
1088
1089
1090 static PyObject *
1091 array_append(arrayobject *self, PyObject *v)
1092 {
1093 return ins(self, (int) Py_SIZE(self), v);
1094 }
1095
1096 PyDoc_STRVAR(append_doc,
1097 "append(x)\n\
1098 \n\
1099 Append new value x to the end of the array.");
1100
1101
1102 static PyObject *
1103 array_byteswap(arrayobject *self, PyObject *unused)
1104 {
1105 char *p;
1106 Py_ssize_t i;
1107
1108 switch (self->ob_descr->itemsize) {
1109 case 1:
1110 break;
1111 case 2:
1112 for (p = self->ob_item, i = Py_SIZE(self); --i >= 0; p += 2) {
1113 char p0 = p[0];
1114 p[0] = p[1];
1115 p[1] = p0;
1116 }
1117 break;
1118 case 4:
1119 for (p = self->ob_item, i = Py_SIZE(self); --i >= 0; p += 4) {
1120 char p0 = p[0];
1121 char p1 = p[1];
1122 p[0] = p[3];
1123 p[1] = p[2];
1124 p[2] = p1;
1125 p[3] = p0;
1126 }
1127 break;
1128 case 8:
1129 for (p = self->ob_item, i = Py_SIZE(self); --i >= 0; p += 8) {
1130 char p0 = p[0];
1131 char p1 = p[1];
1132 char p2 = p[2];
1133 char p3 = p[3];
1134 p[0] = p[7];
1135 p[1] = p[6];
1136 p[2] = p[5];
1137 p[3] = p[4];
1138 p[4] = p3;
1139 p[5] = p2;
1140 p[6] = p1;
1141 p[7] = p0;
1142 }
1143 break;
1144 default:
1145 PyErr_SetString(PyExc_RuntimeError,
1146 "don't know how to byteswap this array type");
1147 return NULL;
1148 }
1149 Py_INCREF(Py_None);
1150 return Py_None;
1151 }
1152
1153 PyDoc_STRVAR(byteswap_doc,
1154 "byteswap()\n\
1155 \n\
1156 Byteswap all items of the array. If the items in the array are not 1, 2,\n\
1157 4, or 8 bytes in size, RuntimeError is raised.");
1158
1159 static PyObject *
1160 array_reduce(arrayobject *array)
1161 {
1162 PyObject *dict, *result;
1163
1164 dict = PyObject_GetAttrString((PyObject *)array, "__dict__");
1165 if (dict == NULL) {
1166 PyErr_Clear();
1167 dict = Py_None;
1168 Py_INCREF(dict);
1169 }
1170 if (Py_SIZE(array) > 0) {
1171 if (array->ob_descr->itemsize
1172 > PY_SSIZE_T_MAX / array->ob_size) {
1173 return PyErr_NoMemory();
1174 }
1175 result = Py_BuildValue("O(cs#)O",
1176 Py_TYPE(array),
1177 array->ob_descr->typecode,
1178 array->ob_item,
1179 Py_SIZE(array) * array->ob_descr->itemsize,
1180 dict);
1181 } else {
1182 result = Py_BuildValue("O(c)O",
1183 Py_TYPE(array),
1184 array->ob_descr->typecode,
1185 dict);
1186 }
1187 Py_DECREF(dict);
1188 return result;
1189 }
1190
1191 PyDoc_STRVAR(array_doc, "Return state information for pickling.");
1192
1193 static PyObject *
1194 array_reverse(arrayobject *self, PyObject *unused)
1195 {
1196 register Py_ssize_t itemsize = self->ob_descr->itemsize;
1197 register char *p, *q;
1198 /* little buffer to hold items while swapping */
1199 char tmp[256]; /* 8 is probably enough -- but why skimp */
1200 assert((size_t)itemsize <= sizeof(tmp));
1201
1202 if (Py_SIZE(self) > 1) {
1203 for (p = self->ob_item,
1204 q = self->ob_item + (Py_SIZE(self) - 1)*itemsize;
1205 p < q;
1206 p += itemsize, q -= itemsize) {
1207 /* memory areas guaranteed disjoint, so memcpy
1208 * is safe (& memmove may be slower).
1209 */
1210 memcpy(tmp, p, itemsize);
1211 memcpy(p, q, itemsize);
1212 memcpy(q, tmp, itemsize);
1213 }
1214 }
1215
1216 Py_INCREF(Py_None);
1217 return Py_None;
1218 }
1219
1220 PyDoc_STRVAR(reverse_doc,
1221 "reverse()\n\
1222 \n\
1223 Reverse the order of the items in the array.");
1224
1225 static PyObject *
1226 array_fromfile(arrayobject *self, PyObject *args)
1227 {
1228 PyObject *f;
1229 Py_ssize_t n;
1230 FILE *fp;
1231 if (!PyArg_ParseTuple(args, "On:fromfile", &f, &n))
1232 return NULL;
1233 fp = PyFile_AsFile(f);
1234 if (fp == NULL) {
1235 PyErr_SetString(PyExc_TypeError, "arg1 must be open file");
1236 return NULL;
1237 }
1238 if (n > 0) {
1239 char *item = self->ob_item;
1240 Py_ssize_t itemsize = self->ob_descr->itemsize;
1241 size_t nread;
1242 Py_ssize_t newlength;
1243 size_t newbytes;
1244 /* Be careful here about overflow */
1245 if ((newlength = Py_SIZE(self) + n) <= 0 ||
1246 (newbytes = newlength * itemsize) / itemsize !=
1247 (size_t)newlength)
1248 goto nomem;
1249 PyMem_RESIZE(item, char, newbytes);
1250 if (item == NULL) {
1251 nomem:
1252 PyErr_NoMemory();
1253 return NULL;
1254 }
1255 self->ob_item = item;
1256 Py_SIZE(self) += n;
1257 self->allocated = Py_SIZE(self);
1258 nread = fread(item + (Py_SIZE(self) - n) * itemsize,
1259 itemsize, n, fp);
1260 if (nread < (size_t)n) {
1261 Py_SIZE(self) -= (n - nread);
1262 PyMem_RESIZE(item, char, Py_SIZE(self)*itemsize);
1263 self->ob_item = item;
1264 self->allocated = Py_SIZE(self);
1265 PyErr_SetString(PyExc_EOFError,
1266 "not enough items in file");
1267 return NULL;
1268 }
1269 }
1270 Py_INCREF(Py_None);
1271 return Py_None;
1272 }
1273
1274 PyDoc_STRVAR(fromfile_doc,
1275 "fromfile(f, n)\n\
1276 \n\
1277 Read n objects from the file object f and append them to the end of the\n\
1278 array. Also called as read.");
1279
1280
1281 static PyObject *
1282 array_fromfile_as_read(arrayobject *self, PyObject *args)
1283 {
1284 if (PyErr_WarnPy3k("array.read() not supported in 3.x; "
1285 "use array.fromfile()", 1) < 0)
1286 return NULL;
1287 return array_fromfile(self, args);
1288 }
1289
1290
1291 static PyObject *
1292 array_tofile(arrayobject *self, PyObject *f)
1293 {
1294 FILE *fp;
1295
1296 fp = PyFile_AsFile(f);
1297 if (fp == NULL) {
1298 PyErr_SetString(PyExc_TypeError, "arg must be open file");
1299 return NULL;
1300 }
1301 if (self->ob_size > 0) {
1302 if (fwrite(self->ob_item, self->ob_descr->itemsize,
1303 self->ob_size, fp) != (size_t)self->ob_size) {
1304 PyErr_SetFromErrno(PyExc_IOError);
1305 clearerr(fp);
1306 return NULL;
1307 }
1308 }
1309 Py_INCREF(Py_None);
1310 return Py_None;
1311 }
1312
1313 PyDoc_STRVAR(tofile_doc,
1314 "tofile(f)\n\
1315 \n\
1316 Write all items (as machine values) to the file object f. Also called as\n\
1317 write.");
1318
1319
1320 static PyObject *
1321 array_tofile_as_write(arrayobject *self, PyObject *f)
1322 {
1323 if (PyErr_WarnPy3k("array.write() not supported in 3.x; "
1324 "use array.tofile()", 1) < 0)
1325 return NULL;
1326 return array_tofile(self, f);
1327 }
1328
1329
1330 static PyObject *
1331 array_fromlist(arrayobject *self, PyObject *list)
1332 {
1333 Py_ssize_t n;
1334 Py_ssize_t itemsize = self->ob_descr->itemsize;
1335
1336 if (!PyList_Check(list)) {
1337 PyErr_SetString(PyExc_TypeError, "arg must be list");
1338 return NULL;
1339 }
1340 n = PyList_Size(list);
1341 if (n > 0) {
1342 char *item = self->ob_item;
1343 Py_ssize_t i;
1344 PyMem_RESIZE(item, char, (Py_SIZE(self) + n) * itemsize);
1345 if (item == NULL) {
1346 PyErr_NoMemory();
1347 return NULL;
1348 }
1349 self->ob_item = item;
1350 Py_SIZE(self) += n;
1351 self->allocated = Py_SIZE(self);
1352 for (i = 0; i < n; i++) {
1353 PyObject *v = PyList_GetItem(list, i);
1354 if ((*self->ob_descr->setitem)(self,
1355 Py_SIZE(self) - n + i, v) != 0) {
1356 Py_SIZE(self) -= n;
1357 if (itemsize && (self->ob_size > PY_SSIZE_T_MAX / itemsize)) {
1358 return PyErr_NoMemory();
1359 }
1360 PyMem_RESIZE(item, char,
1361 Py_SIZE(self) * itemsize);
1362 self->ob_item = item;
1363 self->allocated = Py_SIZE(self);
1364 return NULL;
1365 }
1366 }
1367 }
1368 Py_INCREF(Py_None);
1369 return Py_None;
1370 }
1371
1372 PyDoc_STRVAR(fromlist_doc,
1373 "fromlist(list)\n\
1374 \n\
1375 Append items to array from list.");
1376
1377
1378 static PyObject *
1379 array_tolist(arrayobject *self, PyObject *unused)
1380 {
1381 PyObject *list = PyList_New(Py_SIZE(self));
1382 Py_ssize_t i;
1383
1384 if (list == NULL)
1385 return NULL;
1386 for (i = 0; i < Py_SIZE(self); i++) {
1387 PyObject *v = getarrayitem((PyObject *)self, i);
1388 if (v == NULL) {
1389 Py_DECREF(list);
1390 return NULL;
1391 }
1392 PyList_SetItem(list, i, v);
1393 }
1394 return list;
1395 }
1396
1397 PyDoc_STRVAR(tolist_doc,
1398 "tolist() -> list\n\
1399 \n\
1400 Convert array to an ordinary list with the same items.");
1401
1402
1403 static PyObject *
1404 array_fromstring(arrayobject *self, PyObject *args)
1405 {
1406 char *str;
1407 Py_ssize_t n;
1408 int itemsize = self->ob_descr->itemsize;
1409 if (!PyArg_ParseTuple(args, "s#:fromstring", &str, &n))
1410 return NULL;
1411 if (n % itemsize != 0) {
1412 PyErr_SetString(PyExc_ValueError,
1413 "string length not a multiple of item size");
1414 return NULL;
1415 }
1416 n = n / itemsize;
1417 if (n > 0) {
1418 char *item = self->ob_item;
1419 if ((n > PY_SSIZE_T_MAX - Py_SIZE(self)) ||
1420 ((Py_SIZE(self) + n) > PY_SSIZE_T_MAX / itemsize)) {
1421 return PyErr_NoMemory();
1422 }
1423 PyMem_RESIZE(item, char, (Py_SIZE(self) + n) * itemsize);
1424 if (item == NULL) {
1425 PyErr_NoMemory();
1426 return NULL;
1427 }
1428 self->ob_item = item;
1429 Py_SIZE(self) += n;
1430 self->allocated = Py_SIZE(self);
1431 memcpy(item + (Py_SIZE(self) - n) * itemsize,
1432 str, itemsize*n);
1433 }
1434 Py_INCREF(Py_None);
1435 return Py_None;
1436 }
1437
1438 PyDoc_STRVAR(fromstring_doc,
1439 "fromstring(string)\n\
1440 \n\
1441 Appends items from the string, interpreting it as an array of machine\n\
1442 values,as if it had been read from a file using the fromfile() method).");
1443
1444
1445 static PyObject *
1446 array_tostring(arrayobject *self, PyObject *unused)
1447 {
1448 if (self->ob_size <= PY_SSIZE_T_MAX / self->ob_descr->itemsize) {
1449 return PyString_FromStringAndSize(self->ob_item,
1450 Py_SIZE(self) * self->ob_descr->itemsize);
1451 } else {
1452 return PyErr_NoMemory();
1453 }
1454 }
1455
1456 PyDoc_STRVAR(tostring_doc,
1457 "tostring() -> string\n\
1458 \n\
1459 Convert the array to an array of machine values and return the string\n\
1460 representation.");
1461
1462
1463
1464 #ifdef Py_USING_UNICODE
1465 static PyObject *
1466 array_fromunicode(arrayobject *self, PyObject *args)
1467 {
1468 Py_UNICODE *ustr;
1469 Py_ssize_t n;
1470
1471 if (!PyArg_ParseTuple(args, "u#:fromunicode", &ustr, &n))
1472 return NULL;
1473 if (self->ob_descr->typecode != 'u') {
1474 PyErr_SetString(PyExc_ValueError,
1475 "fromunicode() may only be called on "
1476 "type 'u' arrays");
1477 return NULL;
1478 }
1479 if (n > 0) {
1480 Py_UNICODE *item = (Py_UNICODE *) self->ob_item;
1481 if (Py_SIZE(self) > PY_SSIZE_T_MAX - n) {
1482 return PyErr_NoMemory();
1483 }
1484 PyMem_RESIZE(item, Py_UNICODE, Py_SIZE(self) + n);
1485 if (item == NULL) {
1486 PyErr_NoMemory();
1487 return NULL;
1488 }
1489 self->ob_item = (char *) item;
1490 Py_SIZE(self) += n;
1491 self->allocated = Py_SIZE(self);
1492 memcpy(item + Py_SIZE(self) - n,
1493 ustr, n * sizeof(Py_UNICODE));
1494 }
1495
1496 Py_INCREF(Py_None);
1497 return Py_None;
1498 }
1499
1500 PyDoc_STRVAR(fromunicode_doc,
1501 "fromunicode(ustr)\n\
1502 \n\
1503 Extends this array with data from the unicode string ustr.\n\
1504 The array must be a type 'u' array; otherwise a ValueError\n\
1505 is raised. Use array.fromstring(ustr.decode(...)) to\n\
1506 append Unicode data to an array of some other type.");
1507
1508
1509 static PyObject *
1510 array_tounicode(arrayobject *self, PyObject *unused)
1511 {
1512 if (self->ob_descr->typecode != 'u') {
1513 PyErr_SetString(PyExc_ValueError,
1514 "tounicode() may only be called on type 'u' arrays");
1515 return NULL;
1516 }
1517 return PyUnicode_FromUnicode((Py_UNICODE *) self->ob_item, Py_SIZE(self));
1518 }
1519
1520 PyDoc_STRVAR(tounicode_doc,
1521 "tounicode() -> unicode\n\
1522 \n\
1523 Convert the array to a unicode string. The array must be\n\
1524 a type 'u' array; otherwise a ValueError is raised. Use\n\
1525 array.tostring().decode() to obtain a unicode string from\n\
1526 an array of some other type.");
1527
1528 #endif /* Py_USING_UNICODE */
1529
1530
1531 static PyObject *
1532 array_get_typecode(arrayobject *a, void *closure)
1533 {
1534 char tc = a->ob_descr->typecode;
1535 return PyString_FromStringAndSize(&tc, 1);
1536 }
1537
1538 static PyObject *
1539 array_get_itemsize(arrayobject *a, void *closure)
1540 {
1541 return PyInt_FromLong((long)a->ob_descr->itemsize);
1542 }
1543
1544 static PyGetSetDef array_getsets [] = {
1545 {"typecode", (getter) array_get_typecode, NULL,
1546 "the typecode character used to create the array"},
1547 {"itemsize", (getter) array_get_itemsize, NULL,
1548 "the size, in bytes, of one array item"},
1549 {NULL}
1550 };
1551
1552 static PyMethodDef array_methods[] = {
1553 {"append", (PyCFunction)array_append, METH_O,
1554 append_doc},
1555 {"buffer_info", (PyCFunction)array_buffer_info, METH_NOARGS,
1556 buffer_info_doc},
1557 {"byteswap", (PyCFunction)array_byteswap, METH_NOARGS,
1558 byteswap_doc},
1559 {"__copy__", (PyCFunction)array_copy, METH_NOARGS,
1560 copy_doc},
1561 {"count", (PyCFunction)array_count, METH_O,
1562 count_doc},
1563 {"__deepcopy__",(PyCFunction)array_copy, METH_O,
1564 copy_doc},
1565 {"extend", (PyCFunction)array_extend, METH_O,
1566 extend_doc},
1567 {"fromfile", (PyCFunction)array_fromfile, METH_VARARGS,
1568 fromfile_doc},
1569 {"fromlist", (PyCFunction)array_fromlist, METH_O,
1570 fromlist_doc},
1571 {"fromstring", (PyCFunction)array_fromstring, METH_VARARGS,
1572 fromstring_doc},
1573 #ifdef Py_USING_UNICODE
1574 {"fromunicode", (PyCFunction)array_fromunicode, METH_VARARGS,
1575 fromunicode_doc},
1576 #endif
1577 {"index", (PyCFunction)array_index, METH_O,
1578 index_doc},
1579 {"insert", (PyCFunction)array_insert, METH_VARARGS,
1580 insert_doc},
1581 {"pop", (PyCFunction)array_pop, METH_VARARGS,
1582 pop_doc},
1583 {"read", (PyCFunction)array_fromfile_as_read, METH_VARARGS,
1584 fromfile_doc},
1585 {"__reduce__", (PyCFunction)array_reduce, METH_NOARGS,
1586 array_doc},
1587 {"remove", (PyCFunction)array_remove, METH_O,
1588 remove_doc},
1589 {"reverse", (PyCFunction)array_reverse, METH_NOARGS,
1590 reverse_doc},
1591 /* {"sort", (PyCFunction)array_sort, METH_VARARGS,
1592 sort_doc},*/
1593 {"tofile", (PyCFunction)array_tofile, METH_O,
1594 tofile_doc},
1595 {"tolist", (PyCFunction)array_tolist, METH_NOARGS,
1596 tolist_doc},
1597 {"tostring", (PyCFunction)array_tostring, METH_NOARGS,
1598 tostring_doc},
1599 #ifdef Py_USING_UNICODE
1600 {"tounicode", (PyCFunction)array_tounicode, METH_NOARGS,
1601 tounicode_doc},
1602 #endif
1603 {"write", (PyCFunction)array_tofile_as_write, METH_O,
1604 tofile_doc},
1605 {NULL, NULL} /* sentinel */
1606 };
1607
1608 static PyObject *
1609 array_repr(arrayobject *a)
1610 {
1611 char buf[256], typecode;
1612 PyObject *s, *t, *v = NULL;
1613 Py_ssize_t len;
1614
1615 len = Py_SIZE(a);
1616 typecode = a->ob_descr->typecode;
1617 if (len == 0) {
1618 PyOS_snprintf(buf, sizeof(buf), "array('%c')", typecode);
1619 return PyString_FromString(buf);
1620 }
1621
1622 if (typecode == 'c')
1623 v = array_tostring(a, NULL);
1624 #ifdef Py_USING_UNICODE
1625 else if (typecode == 'u')
1626 v = array_tounicode(a, NULL);
1627 #endif
1628 else
1629 v = array_tolist(a, NULL);
1630 t = PyObject_Repr(v);
1631 Py_XDECREF(v);
1632
1633 PyOS_snprintf(buf, sizeof(buf), "array('%c', ", typecode);
1634 s = PyString_FromString(buf);
1635 PyString_ConcatAndDel(&s, t);
1636 PyString_ConcatAndDel(&s, PyString_FromString(")"));
1637 return s;
1638 }
1639
1640 static PyObject*
1641 array_subscr(arrayobject* self, PyObject* item)
1642 {
1643 if (PyIndex_Check(item)) {
1644 Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
1645 if (i==-1 && PyErr_Occurred()) {
1646 return NULL;
1647 }
1648 if (i < 0)
1649 i += Py_SIZE(self);
1650 return array_item(self, i);
1651 }
1652 else if (PySlice_Check(item)) {
1653 Py_ssize_t start, stop, step, slicelength, cur, i;
1654 PyObject* result;
1655 arrayobject* ar;
1656 int itemsize = self->ob_descr->itemsize;
1657
1658 if (PySlice_GetIndicesEx((PySliceObject*)item, Py_SIZE(self),
1659 &start, &stop, &step, &slicelength) < 0) {
1660 return NULL;
1661 }
1662
1663 if (slicelength <= 0) {
1664 return newarrayobject(&Arraytype, 0, self->ob_descr);
1665 }
1666 else if (step == 1) {
1667 PyObject *result = newarrayobject(&Arraytype,
1668 slicelength, self->ob_descr);
1669 if (result == NULL)
1670 return NULL;
1671 memcpy(((arrayobject *)result)->ob_item,
1672 self->ob_item + start * itemsize,
1673 slicelength * itemsize);
1674 return result;
1675 }
1676 else {
1677 result = newarrayobject(&Arraytype, slicelength, self->ob_descr);
1678 if (!result) return NULL;
1679
1680 ar = (arrayobject*)result;
1681
1682 for (cur = start, i = 0; i < slicelength;
1683 cur += step, i++) {
1684 memcpy(ar->ob_item + i*itemsize,
1685 self->ob_item + cur*itemsize,
1686 itemsize);
1687 }
1688
1689 return result;
1690 }
1691 }
1692 else {
1693 PyErr_SetString(PyExc_TypeError,
1694 "array indices must be integers");
1695 return NULL;
1696 }
1697 }
1698
1699 static int
1700 array_ass_subscr(arrayobject* self, PyObject* item, PyObject* value)
1701 {
1702 Py_ssize_t start, stop, step, slicelength, needed;
1703 arrayobject* other;
1704 int itemsize;
1705
1706 if (PyIndex_Check(item)) {
1707 Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
1708
1709 if (i == -1 && PyErr_Occurred())
1710 return -1;
1711 if (i < 0)
1712 i += Py_SIZE(self);
1713 if (i < 0 || i >= Py_SIZE(self)) {
1714 PyErr_SetString(PyExc_IndexError,
1715 "array assignment index out of range");
1716 return -1;
1717 }
1718 if (value == NULL) {
1719 /* Fall through to slice assignment */
1720 start = i;
1721 stop = i + 1;
1722 step = 1;
1723 slicelength = 1;
1724 }
1725 else
1726 return (*self->ob_descr->setitem)(self, i, value);
1727 }
1728 else if (PySlice_Check(item)) {
1729 if (PySlice_GetIndicesEx((PySliceObject *)item,
1730 Py_SIZE(self), &start, &stop,
1731 &step, &slicelength) < 0) {
1732 return -1;
1733 }
1734 }
1735 else {
1736 PyErr_SetString(PyExc_TypeError,
1737 "array indices must be integer");
1738 return -1;
1739 }
1740 if (value == NULL) {
1741 other = NULL;
1742 needed = 0;
1743 }
1744 else if (array_Check(value)) {
1745 other = (arrayobject *)value;
1746 needed = Py_SIZE(other);
1747 if (self == other) {
1748 /* Special case "self[i:j] = self" -- copy self first */
1749 int ret;
1750 value = array_slice(other, 0, needed);
1751 if (value == NULL)
1752 return -1;
1753 ret = array_ass_subscr(self, item, value);
1754 Py_DECREF(value);
1755 return ret;
1756 }
1757 if (other->ob_descr != self->ob_descr) {
1758 PyErr_BadArgument();
1759 return -1;
1760 }
1761 }
1762 else {
1763 PyErr_Format(PyExc_TypeError,
1764 "can only assign array (not \"%.200s\") to array slice",
1765 Py_TYPE(value)->tp_name);
1766 return -1;
1767 }
1768 itemsize = self->ob_descr->itemsize;
1769 /* for 'a[2:1] = ...', the insertion point is 'start', not 'stop' */
1770 if ((step > 0 && stop < start) ||
1771 (step < 0 && stop > start))
1772 stop = start;
1773 if (step == 1) {
1774 if (slicelength > needed) {
1775 memmove(self->ob_item + (start + needed) * itemsize,
1776 self->ob_item + stop * itemsize,
1777 (Py_SIZE(self) - stop) * itemsize);
1778 if (array_resize(self, Py_SIZE(self) +
1779 needed - slicelength) < 0)
1780 return -1;
1781 }
1782 else if (slicelength < needed) {
1783 if (array_resize(self, Py_SIZE(self) +
1784 needed - slicelength) < 0)
1785 return -1;
1786 memmove(self->ob_item + (start + needed) * itemsize,
1787 self->ob_item + stop * itemsize,
1788 (Py_SIZE(self) - start - needed) * itemsize);
1789 }
1790 if (needed > 0)
1791 memcpy(self->ob_item + start * itemsize,
1792 other->ob_item, needed * itemsize);
1793 return 0;
1794 }
1795 else if (needed == 0) {
1796 /* Delete slice */
1797 Py_ssize_t cur, i;
1798
1799 if (step < 0) {
1800 stop = start + 1;
1801 start = stop + step * (slicelength - 1) - 1;
1802 step = -step;
1803 }
1804 for (cur = start, i = 0; i < slicelength;
1805 cur += step, i++) {
1806 Py_ssize_t lim = step - 1;
1807
1808 if (cur + step >= Py_SIZE(self))
1809 lim = Py_SIZE(self) - cur - 1;
1810 memmove(self->ob_item + (cur - i) * itemsize,
1811 self->ob_item + (cur + 1) * itemsize,
1812 lim * itemsize);
1813 }
1814 cur = start + slicelength * step;
1815 if (cur < Py_SIZE(self)) {
1816 memmove(self->ob_item + (cur-slicelength) * itemsize,
1817 self->ob_item + cur * itemsize,
1818 (Py_SIZE(self) - cur) * itemsize);
1819 }
1820 if (array_resize(self, Py_SIZE(self) - slicelength) < 0)
1821 return -1;
1822 return 0;
1823 }
1824 else {
1825 Py_ssize_t cur, i;
1826
1827 if (needed != slicelength) {
1828 PyErr_Format(PyExc_ValueError,
1829 "attempt to assign array of size %zd "
1830 "to extended slice of size %zd",
1831 needed, slicelength);
1832 return -1;
1833 }
1834 for (cur = start, i = 0; i < slicelength;
1835 cur += step, i++) {
1836 memcpy(self->ob_item + cur * itemsize,
1837 other->ob_item + i * itemsize,
1838 itemsize);
1839 }
1840 return 0;
1841 }
1842 }
1843
1844 static PyMappingMethods array_as_mapping = {
1845 (lenfunc)array_length,
1846 (binaryfunc)array_subscr,
1847 (objobjargproc)array_ass_subscr
1848 };
1849
1850 static const void *emptybuf = "";
1851
1852 static Py_ssize_t
1853 array_buffer_getreadbuf(arrayobject *self, Py_ssize_t index, const void **ptr)
1854 {
1855 if ( index != 0 ) {
1856 PyErr_SetString(PyExc_SystemError,
1857 "Accessing non-existent array segment");
1858 return -1;
1859 }
1860 *ptr = (void *)self->ob_item;
1861 if (*ptr == NULL)
1862 *ptr = emptybuf;
1863 return Py_SIZE(self)*self->ob_descr->itemsize;
1864 }
1865
1866 static Py_ssize_t
1867 array_buffer_getwritebuf(arrayobject *self, Py_ssize_t index, const void **ptr)
1868 {
1869 if ( index != 0 ) {
1870 PyErr_SetString(PyExc_SystemError,
1871 "Accessing non-existent array segment");
1872 return -1;
1873 }
1874 *ptr = (void *)self->ob_item;
1875 if (*ptr == NULL)
1876 *ptr = emptybuf;
1877 return Py_SIZE(self)*self->ob_descr->itemsize;
1878 }
1879
1880 static Py_ssize_t
1881 array_buffer_getsegcount(arrayobject *self, Py_ssize_t *lenp)
1882 {
1883 if ( lenp )
1884 *lenp = Py_SIZE(self)*self->ob_descr->itemsize;
1885 return 1;
1886 }
1887
1888 static PySequenceMethods array_as_sequence = {
1889 (lenfunc)array_length, /*sq_length*/
1890 (binaryfunc)array_concat, /*sq_concat*/
1891 (ssizeargfunc)array_repeat, /*sq_repeat*/
1892 (ssizeargfunc)array_item, /*sq_item*/
1893 (ssizessizeargfunc)array_slice, /*sq_slice*/
1894 (ssizeobjargproc)array_ass_item, /*sq_ass_item*/
1895 (ssizessizeobjargproc)array_ass_slice, /*sq_ass_slice*/
1896 (objobjproc)array_contains, /*sq_contains*/
1897 (binaryfunc)array_inplace_concat, /*sq_inplace_concat*/
1898 (ssizeargfunc)array_inplace_repeat /*sq_inplace_repeat*/
1899 };
1900
1901 static PyBufferProcs array_as_buffer = {
1902 (readbufferproc)array_buffer_getreadbuf,
1903 (writebufferproc)array_buffer_getwritebuf,
1904 (segcountproc)array_buffer_getsegcount,
1905 NULL,
1906 };
1907
1908 static PyObject *
1909 array_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
1910 {
1911 char c;
1912 PyObject *initial = NULL, *it = NULL;
1913 struct arraydescr *descr;
1914
1915 if (type == &Arraytype && !_PyArg_NoKeywords("array.array()", kwds))
1916 return NULL;
1917
1918 if (!PyArg_ParseTuple(args, "c|O:array", &c, &initial))
1919 return NULL;
1920
1921 if (!(initial == NULL || PyList_Check(initial)
1922 || PyString_Check(initial) || PyTuple_Check(initial)
1923 || (c == 'u' && PyUnicode_Check(initial)))) {
1924 it = PyObject_GetIter(initial);
1925 if (it == NULL)
1926 return NULL;
1927 /* We set initial to NULL so that the subsequent code
1928 will create an empty array of the appropriate type
1929 and afterwards we can use array_iter_extend to populate
1930 the array.
1931 */
1932 initial = NULL;
1933 }
1934 for (descr = descriptors; descr->typecode != '\0'; descr++) {
1935 if (descr->typecode == c) {
1936 PyObject *a;
1937 Py_ssize_t len;
1938
1939 if (initial == NULL || !(PyList_Check(initial)
1940 || PyTuple_Check(initial)))
1941 len = 0;
1942 else
1943 len = PySequence_Size(initial);
1944
1945 a = newarrayobject(type, len, descr);
1946 if (a == NULL)
1947 return NULL;
1948
1949 if (len > 0) {
1950 Py_ssize_t i;
1951 for (i = 0; i < len; i++) {
1952 PyObject *v =
1953 PySequence_GetItem(initial, i);
1954 if (v == NULL) {
1955 Py_DECREF(a);
1956 return NULL;
1957 }
1958 if (setarrayitem(a, i, v) != 0) {
1959 Py_DECREF(v);
1960 Py_DECREF(a);
1961 return NULL;
1962 }
1963 Py_DECREF(v);
1964 }
1965 } else if (initial != NULL && PyString_Check(initial)) {
1966 PyObject *t_initial, *v;
1967 t_initial = PyTuple_Pack(1, initial);
1968 if (t_initial == NULL) {
1969 Py_DECREF(a);
1970 return NULL;
1971 }
1972 v = array_fromstring((arrayobject *)a,
1973 t_initial);
1974 Py_DECREF(t_initial);
1975 if (v == NULL) {
1976 Py_DECREF(a);
1977 return NULL;
1978 }
1979 Py_DECREF(v);
1980 #ifdef Py_USING_UNICODE
1981 } else if (initial != NULL && PyUnicode_Check(initial)) {
1982 Py_ssize_t n = PyUnicode_GET_DATA_SIZE(initial);
1983 if (n > 0) {
1984 arrayobject *self = (arrayobject *)a;
1985 char *item = self->ob_item;
1986 item = (char *)PyMem_Realloc(item, n);
1987 if (item == NULL) {
1988 PyErr_NoMemory();
1989 Py_DECREF(a);
1990 return NULL;
1991 }
1992 self->ob_item = item;
1993 Py_SIZE(self) = n / sizeof(Py_UNICODE);
1994 memcpy(item, PyUnicode_AS_DATA(initial), n);
1995 self->allocated = Py_SIZE(self);
1996 }
1997 #endif
1998 }
1999 if (it != NULL) {
2000 if (array_iter_extend((arrayobject *)a, it) == -1) {
2001 Py_DECREF(it);
2002 Py_DECREF(a);
2003 return NULL;
2004 }
2005 Py_DECREF(it);
2006 }
2007 return a;
2008 }
2009 }
2010 PyErr_SetString(PyExc_ValueError,
2011 "bad typecode (must be c, b, B, u, h, H, i, I, l, L, f or d)");
2012 return NULL;
2013 }
2014
2015
2016 PyDoc_STRVAR(module_doc,
2017 "This module defines an object type which can efficiently represent\n\
2018 an array of basic values: characters, integers, floating point\n\
2019 numbers. Arrays are sequence types and behave very much like lists,\n\
2020 except that the type of objects stored in them is constrained. The\n\
2021 type is specified at object creation time by using a type code, which\n\
2022 is a single character. The following type codes are defined:\n\
2023 \n\
2024 Type code C Type Minimum size in bytes \n\
2025 'c' character 1 \n\
2026 'b' signed integer 1 \n\
2027 'B' unsigned integer 1 \n\
2028 'u' Unicode character 2 \n\
2029 'h' signed integer 2 \n\
2030 'H' unsigned integer 2 \n\
2031 'i' signed integer 2 \n\
2032 'I' unsigned integer 2 \n\
2033 'l' signed integer 4 \n\
2034 'L' unsigned integer 4 \n\
2035 'f' floating point 4 \n\
2036 'd' floating point 8 \n\
2037 \n\
2038 The constructor is:\n\
2039 \n\
2040 array(typecode [, initializer]) -- create a new array\n\
2041 ");
2042
2043 PyDoc_STRVAR(arraytype_doc,
2044 "array(typecode [, initializer]) -> array\n\
2045 \n\
2046 Return a new array whose items are restricted by typecode, and\n\
2047 initialized from the optional initializer value, which must be a list,\n\
2048 string. or iterable over elements of the appropriate type.\n\
2049 \n\
2050 Arrays represent basic values and behave very much like lists, except\n\
2051 the type of objects stored in them is constrained.\n\
2052 \n\
2053 Methods:\n\
2054 \n\
2055 append() -- append a new item to the end of the array\n\
2056 buffer_info() -- return information giving the current memory info\n\
2057 byteswap() -- byteswap all the items of the array\n\
2058 count() -- return number of occurences of an object\n\
2059 extend() -- extend array by appending multiple elements from an iterable\n\
2060 fromfile() -- read items from a file object\n\
2061 fromlist() -- append items from the list\n\
2062 fromstring() -- append items from the string\n\
2063 index() -- return index of first occurence of an object\n\
2064 insert() -- insert a new item into the array at a provided position\n\
2065 pop() -- remove and return item (default last)\n\
2066 read() -- DEPRECATED, use fromfile()\n\
2067 remove() -- remove first occurence of an object\n\
2068 reverse() -- reverse the order of the items in the array\n\
2069 tofile() -- write all items to a file object\n\
2070 tolist() -- return the array converted to an ordinary list\n\
2071 tostring() -- return the array converted to a string\n\
2072 write() -- DEPRECATED, use tofile()\n\
2073 \n\
2074 Attributes:\n\
2075 \n\
2076 typecode -- the typecode character used to create the array\n\
2077 itemsize -- the length in bytes of one array item\n\
2078 ");
2079
2080 static PyObject *array_iter(arrayobject *ao);
2081
2082 static PyTypeObject Arraytype = {
2083 PyVarObject_HEAD_INIT(NULL, 0)
2084 "array.array",
2085 sizeof(arrayobject),
2086 0,
2087 (destructor)array_dealloc, /* tp_dealloc */
2088 0, /* tp_print */
2089 0, /* tp_getattr */
2090 0, /* tp_setattr */
2091 0, /* tp_compare */
2092 (reprfunc)array_repr, /* tp_repr */
2093 0, /* tp_as_number*/
2094 &array_as_sequence, /* tp_as_sequence*/
2095 &array_as_mapping, /* tp_as_mapping*/
2096 0, /* tp_hash */
2097 0, /* tp_call */
2098 0, /* tp_str */
2099 PyObject_GenericGetAttr, /* tp_getattro */
2100 0, /* tp_setattro */
2101 &array_as_buffer, /* tp_as_buffer*/
2102 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_WEAKREFS, /* tp_flags */
2103 arraytype_doc, /* tp_doc */
2104 0, /* tp_traverse */
2105 0, /* tp_clear */
2106 array_richcompare, /* tp_richcompare */
2107 offsetof(arrayobject, weakreflist), /* tp_weaklistoffset */
2108 (getiterfunc)array_iter, /* tp_iter */
2109 0, /* tp_iternext */
2110 array_methods, /* tp_methods */
2111 0, /* tp_members */
2112 array_getsets, /* tp_getset */
2113 0, /* tp_base */
2114 0, /* tp_dict */
2115 0, /* tp_descr_get */
2116 0, /* tp_descr_set */
2117 0, /* tp_dictoffset */
2118 0, /* tp_init */
2119 PyType_GenericAlloc, /* tp_alloc */
2120 array_new, /* tp_new */
2121 PyObject_Del, /* tp_free */
2122 };
2123
2124
2125 /*********************** Array Iterator **************************/
2126
2127 typedef struct {
2128 PyObject_HEAD
2129 Py_ssize_t index;
2130 arrayobject *ao;
2131 PyObject * (*getitem)(struct arrayobject *, Py_ssize_t);
2132 } arrayiterobject;
2133
2134 static PyTypeObject PyArrayIter_Type;
2135
2136 #define PyArrayIter_Check(op) PyObject_TypeCheck(op, &PyArrayIter_Type)
2137
2138 static PyObject *
2139 array_iter(arrayobject *ao)
2140 {
2141 arrayiterobject *it;
2142
2143 if (!array_Check(ao)) {
2144 PyErr_BadInternalCall();
2145 return NULL;
2146 }
2147
2148 it = PyObject_GC_New(arrayiterobject, &PyArrayIter_Type);
2149 if (it == NULL)
2150 return NULL;
2151
2152 Py_INCREF(ao);
2153 it->ao = ao;
2154 it->index = 0;
2155 it->getitem = ao->ob_descr->getitem;
2156 PyObject_GC_Track(it);
2157 return (PyObject *)it;
2158 }
2159
2160 static PyObject *
2161 arrayiter_next(arrayiterobject *it)
2162 {
2163 assert(PyArrayIter_Check(it));
2164 if (it->index < Py_SIZE(it->ao))
2165 return (*it->getitem)(it->ao, it->index++);
2166 return NULL;
2167 }
2168
2169 static void
2170 arrayiter_dealloc(arrayiterobject *it)
2171 {
2172 PyObject_GC_UnTrack(it);
2173 Py_XDECREF(it->ao);
2174 PyObject_GC_Del(it);
2175 }
2176
2177 static int
2178 arrayiter_traverse(arrayiterobject *it, visitproc visit, void *arg)
2179 {
2180 Py_VISIT(it->ao);
2181 return 0;
2182 }
2183
2184 static PyTypeObject PyArrayIter_Type = {
2185 PyVarObject_HEAD_INIT(NULL, 0)
2186 "arrayiterator", /* tp_name */
2187 sizeof(arrayiterobject), /* tp_basicsize */
2188 0, /* tp_itemsize */
2189 /* methods */
2190 (destructor)arrayiter_dealloc, /* tp_dealloc */
2191 0, /* tp_print */
2192 0, /* tp_getattr */
2193 0, /* tp_setattr */
2194 0, /* tp_compare */
2195 0, /* tp_repr */
2196 0, /* tp_as_number */
2197 0, /* tp_as_sequence */
2198 0, /* tp_as_mapping */
2199 0, /* tp_hash */
2200 0, /* tp_call */
2201 0, /* tp_str */
2202 PyObject_GenericGetAttr, /* tp_getattro */
2203 0, /* tp_setattro */
2204 0, /* tp_as_buffer */
2205 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
2206 0, /* tp_doc */
2207 (traverseproc)arrayiter_traverse, /* tp_traverse */
2208 0, /* tp_clear */
2209 0, /* tp_richcompare */
2210 0, /* tp_weaklistoffset */
2211 PyObject_SelfIter, /* tp_iter */
2212 (iternextfunc)arrayiter_next, /* tp_iternext */
2213 0, /* tp_methods */
2214 };
2215
2216
2217 /*********************** Install Module **************************/
2218
2219 /* No functions in array module. */
2220 static PyMethodDef a_methods[] = {
2221 {NULL, NULL, 0, NULL} /* Sentinel */
2222 };
2223
2224
2225 PyMODINIT_FUNC
2226 initarray(void)
2227 {
2228 PyObject *m;
2229
2230 Arraytype.ob_type = &PyType_Type;
2231 PyArrayIter_Type.ob_type = &PyType_Type;
2232 m = Py_InitModule3("array", a_methods, module_doc);
2233 if (m == NULL)
2234 return;
2235
2236 Py_INCREF((PyObject *)&Arraytype);
2237 PyModule_AddObject(m, "ArrayType", (PyObject *)&Arraytype);
2238 Py_INCREF((PyObject *)&Arraytype);
2239 PyModule_AddObject(m, "array", (PyObject *)&Arraytype);
2240 /* No need to check the error here, the caller will do that */
2241 }
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