cpython/Modules/arraymodule.c at 3.5 · python/cpython · GitHub

Repository navigation

History

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

/* 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 */

#define PY_SSIZE_T_CLEAN

#include "Python.h"

#include "structmember.h"

#ifdef STDC_HEADERS

#include <stddef.h>

#else /* !STDC_HEADERS */

#ifdef HAVE_SYS_TYPES_H

#include <sys/types.h> /* For size_t */

#endif /* HAVE_SYS_TYPES_H */

#endif /* !STDC_HEADERS */

/*[clinic input]

module array

[clinic start generated code]*/

/*[clinic end generated code: output=da39a3ee5e6b4b0d input=7d1b8d7f5958fd83]*/

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 {

char typecode;

int itemsize;

PyObject * (*getitem)(struct arrayobject *, Py_ssize_t);

int (*setitem)(struct arrayobject *, Py_ssize_t, PyObject *);

char *formats;

int is_integer_type;

int is_signed;

};

typedef struct arrayobject {

PyObject_VAR_HEAD

char *ob_item;

Py_ssize_t allocated;

struct arraydescr *ob_descr;

PyObject *weakreflist; /* List of weak references */

int ob_exports; /* Number of exported buffers */

} arrayobject;

static PyTypeObject Arraytype;

typedef struct {

PyObject_HEAD

Py_ssize_t index;

arrayobject *ao;

PyObject* (*getitem)(struct arrayobject *, Py_ssize_t);

} arrayiterobject;

static PyTypeObject PyArrayIter_Type;

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

enum machine_format_code {

UNKNOWN_FORMAT = -1,

/* UNKNOWN_FORMAT is used to indicate that the machine format for an

* array type code cannot be interpreted. When this occurs, a list of

* Python objects is used to represent the content of the array

* instead of using the memory content of the array directly. In that

* case, the array_reconstructor mechanism is bypassed completely, and

* the standard array constructor is used instead.

* This is will most likely occur when the machine doesn't use IEEE

* floating-point numbers.

UNSIGNED_INT8 = 0,

SIGNED_INT8 = 1,

UNSIGNED_INT16_LE = 2,

UNSIGNED_INT16_BE = 3,

SIGNED_INT16_LE = 4,

SIGNED_INT16_BE = 5,

UNSIGNED_INT32_LE = 6,

UNSIGNED_INT32_BE = 7,

SIGNED_INT32_LE = 8,

SIGNED_INT32_BE = 9,

UNSIGNED_INT64_LE = 10,

UNSIGNED_INT64_BE = 11,

SIGNED_INT64_LE = 12,

SIGNED_INT64_BE = 13,

IEEE_754_FLOAT_LE = 14,

IEEE_754_FLOAT_BE = 15,

IEEE_754_DOUBLE_LE = 16,

IEEE_754_DOUBLE_BE = 17,

UTF16_LE = 18,

UTF16_BE = 19,

UTF32_LE = 20,

UTF32_BE = 21

};

#define MACHINE_FORMAT_CODE_MIN 0

#define MACHINE_FORMAT_CODE_MAX 21

* Must come after arrayobject, arrayiterobject,

* and enum machine_code_type definitions.

#include "clinic/arraymodule.c.h"

#define array_Check(op) PyObject_TypeCheck(op, &Arraytype)

#define array_CheckExact(op) (Py_TYPE(op) == &Arraytype)

static int

array_resize(arrayobject *self, Py_ssize_t newsize)

{

char *items;

size_t _new_size;

if (self->ob_exports > 0 && newsize != Py_SIZE(self)) {

PyErr_SetString(PyExc_BufferError,

"cannot resize an array that is exporting buffers");

return -1;

}

/* 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 array.

if (self->allocated >= newsize &&

Py_SIZE(self) < newsize + 16 &&

self->ob_item != NULL) {

Py_SIZE(self) = newsize;

return 0;

}

if (newsize == 0) {

PyMem_FREE(self->ob_item);

self->ob_item = NULL;

Py_SIZE(self) = 0;

self->allocated = 0;

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) + (Py_SIZE(self) < 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;

Py_SIZE(self) = 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 *

b_getitem(arrayobject *ap, Py_ssize_t i)

{

long x = ((char *)ap->ob_item)[i];

if (x >= 128)

x -= 256;

return PyLong_FromLong(x);

}

static int

b_setitem(arrayobject *ap, Py_ssize_t 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, Py_ssize_t i)

{

long x = ((unsigned char *)ap->ob_item)[i];

return PyLong_FromLong(x);

}

static int

BB_setitem(arrayobject *ap, Py_ssize_t 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;

}

static PyObject *

u_getitem(arrayobject *ap, Py_ssize_t i)

{

return PyUnicode_FromUnicode(&((Py_UNICODE *) ap->ob_item)[i], 1);

}

static int

u_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)

{

Py_UNICODE *p;

Py_ssize_t 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;

}

static PyObject *

h_getitem(arrayobject *ap, Py_ssize_t i)

{

return PyLong_FromLong((long) ((short *)ap->ob_item)[i]);

}

static int

h_setitem(arrayobject *ap, Py_ssize_t 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, Py_ssize_t i)

{

return PyLong_FromLong((long) ((unsigned short *)ap->ob_item)[i]);

}

static int

HH_setitem(arrayobject *ap, Py_ssize_t 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, Py_ssize_t i)

{

return PyLong_FromLong((long) ((int *)ap->ob_item)[i]);

}

static int

i_setitem(arrayobject *ap, Py_ssize_t 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, Py_ssize_t i)

{

return PyLong_FromUnsignedLong(

(unsigned long) ((unsigned int *)ap->ob_item)[i]);

}

static PyObject *

get_int_unless_float(PyObject *v)

{

if (PyFloat_Check(v)) {

PyErr_SetString(PyExc_TypeError,

"array item must be integer");

return NULL;

}

return (PyObject *)_PyLong_FromNbInt(v);

}

static int

II_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)

{

unsigned long x;

int do_decref = 0; /* if nb_int was called */

if (!PyLong_Check(v)) {

v = get_int_unless_float(v);

if (NULL == v) {

return -1;

}

do_decref = 1;

}

x = PyLong_AsUnsignedLong(v);

if (x == (unsigned long)-1 && PyErr_Occurred()) {

if (do_decref) {

Py_DECREF(v);

}

return -1;

}

if (x > UINT_MAX) {

PyErr_SetString(PyExc_OverflowError,

"unsigned int is greater than maximum");

if (do_decref) {

Py_DECREF(v);

}

return -1;

}

if (i >= 0)

((unsigned int *)ap->ob_item)[i] = (unsigned int)x;

if (do_decref) {

Py_DECREF(v);

}

return 0;

}

static PyObject *

l_getitem(arrayobject *ap, Py_ssize_t i)

{

return PyLong_FromLong(((long *)ap->ob_item)[i]);

}

static int

l_setitem(arrayobject *ap, Py_ssize_t 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, Py_ssize_t i)

{

return PyLong_FromUnsignedLong(((unsigned long *)ap->ob_item)[i]);

}

static int

LL_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)

{

unsigned long x;

int do_decref = 0; /* if nb_int was called */

if (!PyLong_Check(v)) {

v = get_int_unless_float(v);

if (NULL == v) {

return -1;

}

do_decref = 1;

}

x = PyLong_AsUnsignedLong(v);

if (x == (unsigned long)-1 && PyErr_Occurred()) {

if (do_decref) {

Py_DECREF(v);

}

return -1;

}

if (i >= 0)

((unsigned long *)ap->ob_item)[i] = x;

if (do_decref) {

Py_DECREF(v);

}

return 0;

}

#ifdef HAVE_LONG_LONG

static PyObject *

q_getitem(arrayobject *ap, Py_ssize_t i)

{

return PyLong_FromLongLong(((PY_LONG_LONG *)ap->ob_item)[i]);

}

static int

q_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)

{

PY_LONG_LONG x;

if (!PyArg_Parse(v, "L;array item must be integer", &x))

return -1;

if (i >= 0)

((PY_LONG_LONG *)ap->ob_item)[i] = x;

return 0;

}

static PyObject *

QQ_getitem(arrayobject *ap, Py_ssize_t i)

{

return PyLong_FromUnsignedLongLong(

((unsigned PY_LONG_LONG *)ap->ob_item)[i]);

}

static int

QQ_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)

{

unsigned PY_LONG_LONG x;

int do_decref = 0; /* if nb_int was called */

if (!PyLong_Check(v)) {

v = get_int_unless_float(v);

if (NULL == v) {

return -1;

}

do_decref = 1;

}

x = PyLong_AsUnsignedLongLong(v);

if (x == (unsigned PY_LONG_LONG)-1 && PyErr_Occurred()) {

if (do_decref) {

Py_DECREF(v);

}

return -1;

}

if (i >= 0)

((unsigned PY_LONG_LONG *)ap->ob_item)[i] = x;

if (do_decref) {

Py_DECREF(v);

}

return 0;

}

#endif

static PyObject *

f_getitem(arrayobject *ap, Py_ssize_t i)

{

return PyFloat_FromDouble((double) ((float *)ap->ob_item)[i]);

}

static int

f_setitem(arrayobject *ap, Py_ssize_t 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, Py_ssize_t i)

{

return PyFloat_FromDouble(((double *)ap->ob_item)[i]);

}

static int

d_setitem(arrayobject *ap, Py_ssize_t 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.

* Don't forget to update typecode_to_mformat_code() if you add a new

* typecode.

static struct arraydescr descriptors[] = {

{'b', 1, b_getitem, b_setitem, "b", 1, 1},

{'B', 1, BB_getitem, BB_setitem, "B", 1, 0},

{'u', sizeof(Py_UNICODE), u_getitem, u_setitem, "u", 0, 0},

{'h', sizeof(short), h_getitem, h_setitem, "h", 1, 1},

{'H', sizeof(short), HH_getitem, HH_setitem, "H", 1, 0},

{'i', sizeof(int), i_getitem, i_setitem, "i", 1, 1},

{'I', sizeof(int), II_getitem, II_setitem, "I", 1, 0},

{'l', sizeof(long), l_getitem, l_setitem, "l", 1, 1},

{'L', sizeof(long), LL_getitem, LL_setitem, "L", 1, 0},

#ifdef HAVE_LONG_LONG

{'q', sizeof(PY_LONG_LONG), q_getitem, q_setitem, "q", 1, 1},

{'Q', sizeof(PY_LONG_LONG), QQ_getitem, QQ_setitem, "Q", 1, 0},

#endif

{'f', sizeof(float), f_getitem, f_setitem, "f", 0, 0},

{'d', sizeof(double), d_getitem, d_setitem, "d", 0, 0},

{'\0', 0, 0, 0, 0, 0, 0} /* Sentinel */

};

/****************************************************************************

Implementations of array object methods.

****************************************************************************/

/*[clinic input]

class array.array "arrayobject *" "&Arraytype"

[clinic start generated code]*/

/*[clinic end generated code: output=da39a3ee5e6b4b0d input=ad43d37e942a8854]*/

static PyObject *

newarrayobject(PyTypeObject *type, Py_ssize_t size, struct arraydescr *descr)

{

arrayobject *op;

size_t nbytes;

if (size < 0) {

PyErr_BadInternalCall();

return NULL;

}

/* Check for overflow */

if (size > PY_SSIZE_T_MAX / descr->itemsize) {

return PyErr_NoMemory();

}

nbytes = size * descr->itemsize;

op = (arrayobject *) type->tp_alloc(type, 0);

if (op == NULL) {

return NULL;

}

op->ob_descr = descr;

op->allocated = size;

op->weakreflist = NULL;

Py_SIZE(op) = size;

if (size <= 0) {

op->ob_item = NULL;

}

else {

op->ob_item = PyMem_NEW(char, nbytes);

if (op->ob_item == NULL) {

Py_DECREF(op);

return PyErr_NoMemory();

}

op->ob_exports = 0;

return (PyObject *) op;

}

static PyObject *

getarrayitem(PyObject *op, Py_ssize_t i)

{

arrayobject *ap;

assert(array_Check(op));

ap = (arrayobject *)op;

assert(i>=0 && i<Py_SIZE(ap));

return (*ap->ob_descr->getitem)(ap, i);

}

static int

ins1(arrayobject *self, Py_ssize_t where, PyObject *v)

{

char *items;

Py_ssize_t n = Py_SIZE(self);

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->weakreflist != NULL)

PyObject_ClearWeakRefs((PyObject *) op);

if (op->ob_item != NULL)

PyMem_DEL(op->ob_item);

Py_TYPE(op)->tp_free((PyObject *)op);

}

static PyObject *

array_richcompare(PyObject *v, PyObject *w, int op)

{

arrayobject *va, *wa;

PyObject *vi = NULL;

PyObject *wi = NULL;

Py_ssize_t i, k;

PyObject *res;

if (!array_Check(v) || !array_Check(w))

Py_RETURN_NOTIMPLEMENTED;

va = (arrayobject *)v;

wa = (arrayobject *)w;

if (Py_SIZE(va) != Py_SIZE(wa) && (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 < Py_SIZE(va) && i < Py_SIZE(wa); 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 */

Py_ssize_t vs = Py_SIZE(va);

Py_ssize_t ws = Py_SIZE(wa);

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 Py_ssize_t

array_length(arrayobject *a)

{

return Py_SIZE(a);

}

static PyObject *

array_item(arrayobject *a, Py_ssize_t i)

{

if (i < 0 || i >= Py_SIZE(a)) {

PyErr_SetString(PyExc_IndexError, "array index out of range");

return NULL;

}

return getarrayitem((PyObject *)a, i);

}

static PyObject *

array_slice(arrayobject *a, Py_ssize_t ilow, Py_ssize_t ihigh)

{

arrayobject *np;

if (ilow < 0)

ilow = 0;

else if (ilow > Py_SIZE(a))

ilow = Py_SIZE(a);

if (ihigh < 0)

ihigh = 0;

if (ihigh < ilow)

ihigh = ilow;

else if (ihigh > Py_SIZE(a))

ihigh = Py_SIZE(a);

np = (arrayobject *) newarrayobject(&Arraytype, ihigh - ilow, a->ob_descr);

if (np == NULL)

return NULL;

if (ihigh > ilow) {

memcpy(np->ob_item, a->ob_item + ilow * a->ob_descr->itemsize,

(ihigh-ilow) * a->ob_descr->itemsize);

}

return (PyObject *)np;

}

/*[clinic input]

array.array.__copy__

Return a copy of the array.

[clinic start generated code]*/

static PyObject *

array_array___copy___impl(arrayobject *self)

/*[clinic end generated code: output=dec7c3f925d9619e input=ad1ee5b086965f09]*/

{

return array_slice(self, 0, Py_SIZE(self));

}

/*[clinic input]

array.array.__deepcopy__

unused: object

Return a copy of the array.

[clinic start generated code]*/

static PyObject *

array_array___deepcopy__(arrayobject *self, PyObject *unused)

/*[clinic end generated code: output=1ec748d8e14a9faa input=2405ecb4933748c4]*/

{

return array_array___copy___impl(self);

}

static PyObject *

array_concat(arrayobject *a, PyObject *bb)

{

Py_ssize_t size;

arrayobject *np;

if (!array_Check(bb)) {

PyErr_Format(PyExc_TypeError,

"can only append array (not \"%.200s\") to array",

Py_TYPE(bb)->tp_name);

return NULL;

}

#define b ((arrayobject *)bb)

if (a->ob_descr != b->ob_descr) {

PyErr_BadArgument();

return NULL;

}

if (Py_SIZE(a) > PY_SSIZE_T_MAX - Py_SIZE(b)) {

return PyErr_NoMemory();

}

size = Py_SIZE(a) + Py_SIZE(b);

np = (arrayobject *) newarrayobject(&Arraytype, size, a->ob_descr);

if (np == NULL) {

return NULL;

}

if (Py_SIZE(a) > 0) {

memcpy(np->ob_item, a->ob_item, Py_SIZE(a)*a->ob_descr->itemsize);

}

if (Py_SIZE(b) > 0) {

memcpy(np->ob_item + Py_SIZE(a)*a->ob_descr->itemsize,

b->ob_item, Py_SIZE(b)*b->ob_descr->itemsize);

}

return (PyObject *)np;

#undef b

}

static PyObject *

array_repeat(arrayobject *a, Py_ssize_t n)

{

Py_ssize_t size;

arrayobject *np;

Py_ssize_t oldbytes, newbytes;

if (n < 0)

n = 0;

if ((Py_SIZE(a) != 0) && (n > PY_SSIZE_T_MAX / Py_SIZE(a))) {

return PyErr_NoMemory();

}

size = Py_SIZE(a) * n;

np = (arrayobject *) newarrayobject(&Arraytype, size, a->ob_descr);

if (np == NULL)

return NULL;

if (size == 0)

return (PyObject *)np;

oldbytes = Py_SIZE(a) * a->ob_descr->itemsize;

newbytes = oldbytes * n;

/* this follows the code in unicode_repeat */

if (oldbytes == 1) {

memset(np->ob_item, a->ob_item[0], newbytes);

} else {

Py_ssize_t done = oldbytes;

Py_MEMCPY(np->ob_item, a->ob_item, oldbytes);

while (done < newbytes) {

Py_ssize_t ncopy = (done <= newbytes-done) ? done : newbytes-done;

Py_MEMCPY(np->ob_item+done, np->ob_item, ncopy);

done += ncopy;

}

return (PyObject *)np;

}

static int

array_ass_slice(arrayobject *a, Py_ssize_t ilow, Py_ssize_t ihigh, PyObject *v)

{

char *item;

Py_ssize_t n; /* Size of replacement array */

Py_ssize_t d; /* Change in size */

#define b ((arrayobject *)v)

if (v == NULL)

n = 0;

else if (array_Check(v)) {

n = Py_SIZE(b);

if (a == b) {

/* Special case "a[i:j] = a" -- copy b first */

int ret;

v = array_slice(b, 0, n);

if (!v)

return -1;

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",

Py_TYPE(v)->tp_name);

return -1;

}

if (ilow < 0)

ilow = 0;

else if (ilow > Py_SIZE(a))

ilow = Py_SIZE(a);

if (ihigh < 0)

ihigh = 0;

if (ihigh < ilow)

ihigh = ilow;

else if (ihigh > Py_SIZE(a))

ihigh = Py_SIZE(a);

item = a->ob_item;

d = n - (ihigh-ilow);

/* Issue #4509: If the array has exported buffers and the slice

assignment would change the size of the array, fail early to make

sure we don't modify it. */

if (d != 0 && a->ob_exports > 0) {

PyErr_SetString(PyExc_BufferError,

"cannot resize an array that is exporting buffers");

return -1;

}

if (d < 0) { /* Delete -d items */

memmove(item + (ihigh+d)*a->ob_descr->itemsize,

item + ihigh*a->ob_descr->itemsize,

(Py_SIZE(a)-ihigh)*a->ob_descr->itemsize);

if (array_resize(a, Py_SIZE(a) + d) == -1)

return -1;

}

else if (d > 0) { /* Insert d items */

if (array_resize(a, Py_SIZE(a) + d))

return -1;

memmove(item + (ihigh+d)*a->ob_descr->itemsize,

item + ihigh*a->ob_descr->itemsize,

(Py_SIZE(a)-ihigh)*a->ob_descr->itemsize);

}

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, Py_ssize_t i, PyObject *v)

{

if (i < 0 || i >= Py_SIZE(a)) {

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, Py_ssize_t 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, Py_SIZE(self), 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)

{

Py_ssize_t size, oldsize, bbsize;

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;

}

if ((Py_SIZE(self) > PY_SSIZE_T_MAX - Py_SIZE(b)) ||

((Py_SIZE(self) + Py_SIZE(b)) > PY_SSIZE_T_MAX / self->ob_descr->itemsize)) {

View remainder of file in raw view

cpython/Modules/arraymodule.c at 3.5 · python/cpython · GitHub

Repository navigation

Expand file tree

Breadcrumbs

arraymodule.c

Latest commit

History

Breadcrumbs

arraymodule.c

File metadata and controls