Source

cpython / Modules / _fileio.c

  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
/* Author: Daniel Stutzbach */

#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stddef.h> /* For offsetof */

/*
 * Known likely problems:
 *
 * - Files larger then 2**32-1
 * - Files with unicode filenames
 * - Passing numbers greater than 2**32-1 when an integer is expected
 * - Making it work on Windows and other oddball platforms
 *
 * To Do:
 *
 * - autoconfify header file inclusion
 */

#ifdef MS_WINDOWS
/* can simulate truncate with Win32 API functions; see file_truncate */
#define HAVE_FTRUNCATE
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif

typedef struct {
	PyObject_HEAD
	int fd;
	unsigned readable : 1;
	unsigned writable : 1;
	int seekable : 2; /* -1 means unknown */
	int closefd : 1;
	PyObject *weakreflist;
} PyFileIOObject;

PyTypeObject PyFileIO_Type;

#define PyFileIO_Check(op) (PyObject_TypeCheck((op), &PyFileIO_Type))

/* Returns 0 on success, errno (which is < 0) on failure. */
static int
internal_close(PyFileIOObject *self)
{
	int save_errno = 0;
	if (self->fd >= 0) {
		int fd = self->fd;
		self->fd = -1;
		Py_BEGIN_ALLOW_THREADS
		if (close(fd) < 0)
			save_errno = errno;
		Py_END_ALLOW_THREADS
	}
	return save_errno;
}

static PyObject *
fileio_close(PyFileIOObject *self)
{
	if (!self->closefd) {
		if (PyErr_WarnEx(PyExc_RuntimeWarning,
				 "Trying to close unclosable fd!", 3) < 0) {
			return NULL;
		}
		Py_RETURN_NONE;
	}
	errno = internal_close(self);
	if (errno < 0) {
		PyErr_SetFromErrno(PyExc_IOError);
		return NULL;
	}

	Py_RETURN_NONE;
}

static PyObject *
fileio_new(PyTypeObject *type, PyObject *args, PyObject *kews)
{
	PyFileIOObject *self;

	assert(type != NULL && type->tp_alloc != NULL);

	self = (PyFileIOObject *) type->tp_alloc(type, 0);
	if (self != NULL) {
		self->fd = -1;
		self->weakreflist = NULL;
	}

	return (PyObject *) self;
}

/* On Unix, open will succeed for directories.
   In Python, there should be no file objects referring to
   directories, so we need a check.  */

static int
dircheck(PyFileIOObject* self)
{
#if defined(HAVE_FSTAT) && defined(S_IFDIR) && defined(EISDIR)
	struct stat buf;
	if (self->fd < 0)
		return 0;
	if (fstat(self->fd, &buf) == 0 && S_ISDIR(buf.st_mode)) {
#ifdef HAVE_STRERROR
		char *msg = strerror(EISDIR);
#else
		char *msg = "Is a directory";
#endif
		PyObject *exc;
		internal_close(self);

		exc = PyObject_CallFunction(PyExc_IOError, "(is)",
					    EISDIR, msg);
		PyErr_SetObject(PyExc_IOError, exc);
		Py_XDECREF(exc);
		return -1;
	}
#endif
	return 0;
}


static int
fileio_init(PyObject *oself, PyObject *args, PyObject *kwds)
{
	PyFileIOObject *self = (PyFileIOObject *) oself;
	static char *kwlist[] = {"file", "mode", "closefd", NULL};
	char *name = NULL;
	char *mode = "r";
	char *s;
#ifdef MS_WINDOWS
	Py_UNICODE *widename = NULL;
#endif
	int ret = 0;
	int rwa = 0, plus = 0, append = 0;
	int flags = 0;
	int fd = -1;
	int closefd = 1;

	assert(PyFileIO_Check(oself));
	if (self->fd >= 0) {
		/* Have to close the existing file first. */
		if (internal_close(self) < 0)
			return -1;
	}

	if (PyArg_ParseTupleAndKeywords(args, kwds, "i|si:fileio",
					kwlist, &fd, &mode, &closefd)) {
		if (fd < 0) {
			PyErr_SetString(PyExc_ValueError,
					"Negative filedescriptor");
			return -1;
		}
	}
	else {
		PyErr_Clear();

#ifdef Py_WIN_WIDE_FILENAMES
	    if (GetVersion() < 0x80000000) {
		/* On NT, so wide API available */
		PyObject *po;
		if (PyArg_ParseTupleAndKeywords(args, kwds, "U|si:fileio",
						kwlist, &po, &mode, &closefd)
						) {
			widename = PyUnicode_AS_UNICODE(po);
		} else {
			/* Drop the argument parsing error as narrow
			   strings are also valid. */
			PyErr_Clear();
		}
	    }
	    if (widename == NULL)
#endif
	    {
		if (!PyArg_ParseTupleAndKeywords(args, kwds, "et|si:fileio",
						 kwlist,
						 Py_FileSystemDefaultEncoding,
						 &name, &mode, &closefd))
			goto error;
	    }
	}

	self->readable = self->writable = 0;
	self->seekable = -1;
	s = mode;
	while (*s) {
		switch (*s++) {
		case 'r':
			if (rwa) {
			bad_mode:
				PyErr_SetString(PyExc_ValueError,
						"Must have exactly one of read/write/append mode");
				goto error;
			}
			rwa = 1;
			self->readable = 1;
			break;
		case 'w':
			if (rwa)
				goto bad_mode;
			rwa = 1;
			self->writable = 1;
			flags |= O_CREAT | O_TRUNC;
			break;
		case 'a':
			if (rwa)
				goto bad_mode;
			rwa = 1;
			self->writable = 1;
			flags |= O_CREAT;
			append = 1;
			break;
		case '+':
			if (plus)
				goto bad_mode;
			self->readable = self->writable = 1;
			plus = 1;
			break;
		default:
			PyErr_Format(PyExc_ValueError,
				     "invalid mode: %.200s", mode);
			goto error;
		}
	}

	if (!rwa)
		goto bad_mode;

	if (self->readable && self->writable)
		flags |= O_RDWR;
	else if (self->readable)
		flags |= O_RDONLY;
	else
		flags |= O_WRONLY;

#ifdef O_BINARY
	flags |= O_BINARY;
#endif

#ifdef O_APPEND
	if (append)
		flags |= O_APPEND;
#endif

	if (fd >= 0) {
		self->fd = fd;
		self->closefd = closefd;
	}
	else {
		self->closefd = 1;
		if (!closefd) {
			PyErr_SetString(PyExc_ValueError,
                            "Cannot use closefd=True with file name");
			goto error;
		}

		Py_BEGIN_ALLOW_THREADS
		errno = 0;
#ifdef MS_WINDOWS
		if (widename != NULL)
			self->fd = _wopen(widename, flags, 0666);
		else
#endif
			self->fd = open(name, flags, 0666);
		Py_END_ALLOW_THREADS
		if (self->fd < 0 || dircheck(self) < 0) {
#ifdef MS_WINDOWS
			PyErr_SetFromErrnoWithUnicodeFilename(PyExc_IOError, widename);
#else
			PyErr_SetFromErrnoWithFilename(PyExc_IOError, name);
#endif
			goto error;
		}
	}

	goto done;

 error:
	ret = -1;

 done:
	PyMem_Free(name);
	return ret;
}

static void
fileio_dealloc(PyFileIOObject *self)
{
	if (self->weakreflist != NULL)
		PyObject_ClearWeakRefs((PyObject *) self);

	if (self->fd >= 0 && self->closefd) {
		errno = internal_close(self);
		if (errno < 0) {
#ifdef HAVE_STRERROR
			PySys_WriteStderr("close failed: [Errno %d] %s\n",
                                          errno, strerror(errno));
#else
			PySys_WriteStderr("close failed: [Errno %d]\n", errno);
#endif
		}
	}

	Py_TYPE(self)->tp_free((PyObject *)self);
}

static PyObject *
err_closed(void)
{
	PyErr_SetString(PyExc_ValueError, "I/O operation on closed file");
	return NULL;
}

static PyObject *
err_mode(char *action)
{
	PyErr_Format(PyExc_ValueError, "File not open for %s", action);
	return NULL;
}

static PyObject *
fileio_fileno(PyFileIOObject *self)
{
	if (self->fd < 0)
		return err_closed();
	return PyLong_FromLong((long) self->fd);
}

static PyObject *
fileio_readable(PyFileIOObject *self)
{
	if (self->fd < 0)
		return err_closed();
	return PyBool_FromLong((long) self->readable);
}

static PyObject *
fileio_writable(PyFileIOObject *self)
{
	if (self->fd < 0)
		return err_closed();
	return PyBool_FromLong((long) self->writable);
}

static PyObject *
fileio_seekable(PyFileIOObject *self)
{
	if (self->fd < 0)
		return err_closed();
	if (self->seekable < 0) {
		int ret;
		Py_BEGIN_ALLOW_THREADS
		ret = lseek(self->fd, 0, SEEK_CUR);
		Py_END_ALLOW_THREADS
		if (ret < 0)
			self->seekable = 0;
		else
			self->seekable = 1;
	}
	return PyBool_FromLong((long) self->seekable);
}

static PyObject *
fileio_readinto(PyFileIOObject *self, PyObject *args)
{
	char *ptr;
	Py_ssize_t n;

	if (self->fd < 0)
		return err_closed();
	if (!self->readable)
		return err_mode("reading");

	if (!PyArg_ParseTuple(args, "w#", &ptr, &n))
		return NULL;

	Py_BEGIN_ALLOW_THREADS
	errno = 0;
	n = read(self->fd, ptr, n);
	Py_END_ALLOW_THREADS
	if (n < 0) {
		if (errno == EAGAIN)
			Py_RETURN_NONE;
		PyErr_SetFromErrno(PyExc_IOError);
		return NULL;
	}

	return PyLong_FromSsize_t(n);
}

#define DEFAULT_BUFFER_SIZE (8*1024)

static PyObject *
fileio_readall(PyFileIOObject *self)
{
	PyObject *result;
	Py_ssize_t total = 0;
	int n;

	result = PyString_FromStringAndSize(NULL, DEFAULT_BUFFER_SIZE);
	if (result == NULL)
		return NULL;

	while (1) {
		Py_ssize_t newsize = total + DEFAULT_BUFFER_SIZE;
		if (PyString_GET_SIZE(result) < newsize) {
			if (_PyString_Resize(&result, newsize) < 0) {
				if (total == 0) {
					Py_DECREF(result);
					return NULL;
				}
				PyErr_Clear();
				break;
			}
		}
		Py_BEGIN_ALLOW_THREADS
		errno = 0;
		n = read(self->fd,
			 PyString_AS_STRING(result) + total,
			 newsize - total);
		Py_END_ALLOW_THREADS
		if (n == 0)
			break;
		if (n < 0) {
			if (total > 0)
				break;
			if (errno == EAGAIN) {
				Py_DECREF(result);
				Py_RETURN_NONE;
			}
			Py_DECREF(result);
			PyErr_SetFromErrno(PyExc_IOError);
			return NULL;
		}
		total += n;
	}

	if (PyString_GET_SIZE(result) > total) {
		if (_PyString_Resize(&result, total) < 0) {
			/* This should never happen, but just in case */
			Py_DECREF(result);
			return NULL;
		}
	}
	return result;
}

static PyObject *
fileio_read(PyFileIOObject *self, PyObject *args)
{
	char *ptr;
	Py_ssize_t n;
	Py_ssize_t size = -1;
	PyObject *bytes;

	if (self->fd < 0)
		return err_closed();
	if (!self->readable)
		return err_mode("reading");

	if (!PyArg_ParseTuple(args, "|n", &size))
		return NULL;

        if (size < 0) {
		return fileio_readall(self);
	}

	bytes = PyString_FromStringAndSize(NULL, size);
	if (bytes == NULL)
		return NULL;
	ptr = PyString_AS_STRING(bytes);

	Py_BEGIN_ALLOW_THREADS
	errno = 0;
	n = read(self->fd, ptr, size);
	Py_END_ALLOW_THREADS

	if (n < 0) {
		if (errno == EAGAIN)
			Py_RETURN_NONE;
		PyErr_SetFromErrno(PyExc_IOError);
		return NULL;
	}

	if (n != size) {
		if (_PyString_Resize(&bytes, n) < 0) {
			Py_DECREF(bytes);
			return NULL;
		}
	}

	return (PyObject *) bytes;
}

static PyObject *
fileio_write(PyFileIOObject *self, PyObject *args)
{
	Py_ssize_t n;
	char *ptr;

	if (self->fd < 0)
		return err_closed();
	if (!self->writable)
		return err_mode("writing");

	if (!PyArg_ParseTuple(args, "s#", &ptr, &n))
		return NULL;

	Py_BEGIN_ALLOW_THREADS
	errno = 0;
	n = write(self->fd, ptr, n);
	Py_END_ALLOW_THREADS

	if (n < 0) {
		if (errno == EAGAIN)
			Py_RETURN_NONE;
		PyErr_SetFromErrno(PyExc_IOError);
		return NULL;
	}

	return PyLong_FromSsize_t(n);
}

/* XXX Windows support below is likely incomplete */

#if defined(MS_WIN64) || defined(MS_WINDOWS)
typedef PY_LONG_LONG Py_off_t;
#else
typedef off_t Py_off_t;
#endif

/* Cribbed from posix_lseek() */
static PyObject *
portable_lseek(int fd, PyObject *posobj, int whence)
{
	Py_off_t pos, res;

#ifdef SEEK_SET
	/* Turn 0, 1, 2 into SEEK_{SET,CUR,END} */
	switch (whence) {
#if SEEK_SET != 0
	case 0: whence = SEEK_SET; break;
#endif
#if SEEK_CUR != 1
	case 1: whence = SEEK_CUR; break;
#endif
#if SEEL_END != 2
	case 2: whence = SEEK_END; break;
#endif
	}
#endif /* SEEK_SET */

	if (posobj == NULL)
		pos = 0;
	else {
		if(PyFloat_Check(posobj)) {
			PyErr_SetString(PyExc_TypeError, "an integer is required");
			return NULL;
		}
#if !defined(HAVE_LARGEFILE_SUPPORT)
		pos = PyLong_AsLong(posobj);
#else
		pos = PyLong_Check(posobj) ?
			PyLong_AsLongLong(posobj) : PyLong_AsLong(posobj);
#endif
		if (PyErr_Occurred())
			return NULL;
	}

	Py_BEGIN_ALLOW_THREADS
#if defined(MS_WIN64) || defined(MS_WINDOWS)
	res = _lseeki64(fd, pos, whence);
#else
	res = lseek(fd, pos, whence);
#endif
	Py_END_ALLOW_THREADS
	if (res < 0)
		return PyErr_SetFromErrno(PyExc_IOError);

#if !defined(HAVE_LARGEFILE_SUPPORT)
	return PyLong_FromLong(res);
#else
	return PyLong_FromLongLong(res);
#endif
}

static PyObject *
fileio_seek(PyFileIOObject *self, PyObject *args)
{
	PyObject *posobj;
	int whence = 0;

	if (self->fd < 0)
		return err_closed();

	if (!PyArg_ParseTuple(args, "O|i", &posobj, &whence))
		return NULL;

	return portable_lseek(self->fd, posobj, whence);
}

static PyObject *
fileio_tell(PyFileIOObject *self, PyObject *args)
{
	if (self->fd < 0)
		return err_closed();

	return portable_lseek(self->fd, NULL, 1);
}

#ifdef HAVE_FTRUNCATE
static PyObject *
fileio_truncate(PyFileIOObject *self, PyObject *args)
{
	PyObject *posobj = NULL;
	Py_off_t pos;
	int ret;
	int fd;

	fd = self->fd;
	if (fd < 0)
		return err_closed();
	if (!self->writable)
		return err_mode("writing");

	if (!PyArg_ParseTuple(args, "|O", &posobj))
		return NULL;

	if (posobj == Py_None || posobj == NULL) {
                posobj = portable_lseek(fd, NULL, 1);
                if (posobj == NULL)
                  return NULL;
        }
        else {
		Py_INCREF(posobj);
        }

#if !defined(HAVE_LARGEFILE_SUPPORT)
	pos = PyLong_AsLong(posobj);
#else
	pos = PyLong_Check(posobj) ?
		PyLong_AsLongLong(posobj) : PyLong_AsLong(posobj);
#endif
	if (PyErr_Occurred()) {
		Py_DECREF(posobj);
		return NULL;
	}

#ifdef MS_WINDOWS
	/* MS _chsize doesn't work if newsize doesn't fit in 32 bits,
	   so don't even try using it. */
	{
		HANDLE hFile;
		PyObject *pos2, *oldposobj;

		/* store the current position */
		oldposobj = portable_lseek(self->fd, NULL, 1);
		if (oldposobj == NULL) {
			Py_DECREF(posobj);
			return NULL;
		}

		/* Have to move current pos to desired endpoint on Windows. */
		errno = 0;
		pos2 = portable_lseek(fd, posobj, SEEK_SET);
		if (pos2 == NULL) {
			Py_DECREF(posobj);
			Py_DECREF(oldposobj);
			return NULL;
		}
		Py_DECREF(pos2);

		/* Truncate.  Note that this may grow the file! */
		Py_BEGIN_ALLOW_THREADS
		errno = 0;
		hFile = (HANDLE)_get_osfhandle(fd);
		ret = hFile == (HANDLE)-1;
		if (ret == 0) {
			ret = SetEndOfFile(hFile) == 0;
			if (ret)
				errno = EACCES;
		}
		Py_END_ALLOW_THREADS

		if (ret == 0) {
			/* Move to the previous position in the file */
			pos2 = portable_lseek(fd, oldposobj, SEEK_SET);
			if (pos2 == NULL) {
				Py_DECREF(posobj);
				Py_DECREF(oldposobj);
				return NULL;
			}
		}
		Py_DECREF(pos2);
		Py_DECREF(oldposobj);
	}
#else
	Py_BEGIN_ALLOW_THREADS
	errno = 0;
	ret = ftruncate(fd, pos);
	Py_END_ALLOW_THREADS
#endif /* !MS_WINDOWS */

	if (ret != 0) {
		Py_DECREF(posobj);
		PyErr_SetFromErrno(PyExc_IOError);
		return NULL;
	}

	return posobj;
}
#endif

static char *
mode_string(PyFileIOObject *self)
{
	if (self->readable) {
		if (self->writable)
			return "r+";
		else
			return "r";
	}
	else
		return "w";
}

static PyObject *
fileio_repr(PyFileIOObject *self)
{
        if (self->fd < 0)
		return PyUnicode_FromFormat("_fileio._FileIO(-1)");

	return PyUnicode_FromFormat("_fileio._FileIO(%d, '%s')",
				   self->fd, mode_string(self));
}

static PyObject *
fileio_isatty(PyFileIOObject *self)
{
	long res;

	if (self->fd < 0)
		return err_closed();
	Py_BEGIN_ALLOW_THREADS
	res = isatty(self->fd);
	Py_END_ALLOW_THREADS
	return PyBool_FromLong(res);
}


PyDoc_STRVAR(fileio_doc,
"file(name: str[, mode: str]) -> file IO object\n"
"\n"
"Open a file.  The mode can be 'r', 'w' or 'a' for reading (default),\n"
"writing or appending.	The file will be created if it doesn't exist\n"
"when opened for writing or appending; it will be truncated when\n"
"opened for writing.  Add a '+' to the mode to allow simultaneous\n"
"reading and writing.");

PyDoc_STRVAR(read_doc,
"read(size: int) -> bytes.  read at most size bytes, returned as bytes.\n"
"\n"
"Only makes one system call, so less data may be returned than requested\n"
"In non-blocking mode, returns None if no data is available.\n"
"On end-of-file, returns ''.");

PyDoc_STRVAR(readall_doc,
"readall() -> bytes.  read all data from the file, returned as bytes.\n"
"\n"
"In non-blocking mode, returns as much as is immediately available,\n"
"or None if no data is available.  On end-of-file, returns ''.");

PyDoc_STRVAR(write_doc,
"write(b: bytes) -> int.  Write bytes b to file, return number written.\n"
"\n"
"Only makes one system call, so not all of the data may be written.\n"
"The number of bytes actually written is returned.");

PyDoc_STRVAR(fileno_doc,
"fileno() -> int. \"file descriptor\".\n"
"\n"
"This is needed for lower-level file interfaces, such the fcntl module.");

PyDoc_STRVAR(seek_doc,
"seek(offset: int[, whence: int]) -> None.  Move to new file position.\n"
"\n"
"Argument offset is a byte count.  Optional argument whence defaults to\n"
"0 (offset from start of file, offset should be >= 0); other values are 1\n"
"(move relative to current position, positive or negative), and 2 (move\n"
"relative to end of file, usually negative, although many platforms allow\n"
"seeking beyond the end of a file)."
"\n"
"Note that not all file objects are seekable.");

#ifdef HAVE_FTRUNCATE
PyDoc_STRVAR(truncate_doc,
"truncate([size: int]) -> None.	 Truncate the file to at most size bytes.\n"
"\n"
"Size defaults to the current file position, as returned by tell().");
#endif

PyDoc_STRVAR(tell_doc,
"tell() -> int.	 Current file position");

PyDoc_STRVAR(readinto_doc,
"readinto() -> Undocumented.  Don't use this; it may go away.");

PyDoc_STRVAR(close_doc,
"close() -> None.  Close the file.\n"
"\n"
"A closed file cannot be used for further I/O operations.  close() may be\n"
"called more than once without error.  Changes the fileno to -1.");

PyDoc_STRVAR(isatty_doc,
"isatty() -> bool.  True if the file is connected to a tty device.");

PyDoc_STRVAR(seekable_doc,
"seekable() -> bool.  True if file supports random-access.");

PyDoc_STRVAR(readable_doc,
"readable() -> bool.  True if file was opened in a read mode.");

PyDoc_STRVAR(writable_doc,
"writable() -> bool.  True if file was opened in a write mode.");

static PyMethodDef fileio_methods[] = {
	{"read",     (PyCFunction)fileio_read,	   METH_VARARGS, read_doc},
	{"readall",  (PyCFunction)fileio_readall,  METH_NOARGS,  readall_doc},
	{"readinto", (PyCFunction)fileio_readinto, METH_VARARGS, readinto_doc},
	{"write",    (PyCFunction)fileio_write,	   METH_VARARGS, write_doc},
	{"seek",     (PyCFunction)fileio_seek,	   METH_VARARGS, seek_doc},
	{"tell",     (PyCFunction)fileio_tell,	   METH_VARARGS, tell_doc},
#ifdef HAVE_FTRUNCATE
	{"truncate", (PyCFunction)fileio_truncate, METH_VARARGS, truncate_doc},
#endif
	{"close",    (PyCFunction)fileio_close,	   METH_NOARGS,	 close_doc},
	{"seekable", (PyCFunction)fileio_seekable, METH_NOARGS,	 seekable_doc},
	{"readable", (PyCFunction)fileio_readable, METH_NOARGS,	 readable_doc},
	{"writable", (PyCFunction)fileio_writable, METH_NOARGS,	 writable_doc},
	{"fileno",   (PyCFunction)fileio_fileno,   METH_NOARGS,	 fileno_doc},
	{"isatty",   (PyCFunction)fileio_isatty,   METH_NOARGS,	 isatty_doc},
	{NULL,	     NULL}	       /* sentinel */
};

/* 'closed' and 'mode' are attributes for backwards compatibility reasons. */

static PyObject *
get_closed(PyFileIOObject *self, void *closure)
{
	return PyBool_FromLong((long)(self->fd < 0));
}

static PyObject *
get_mode(PyFileIOObject *self, void *closure)
{
	return PyUnicode_FromString(mode_string(self));
}

static PyGetSetDef fileio_getsetlist[] = {
	{"closed", (getter)get_closed, NULL, "True if the file is closed"},
	{"mode", (getter)get_mode, NULL, "String giving the file mode"},
	{0},
};

PyTypeObject PyFileIO_Type = {
	PyVarObject_HEAD_INIT(&PyType_Type, 0)
	"_FileIO",
	sizeof(PyFileIOObject),
	0,
	(destructor)fileio_dealloc,		/* tp_dealloc */
	0,					/* tp_print */
	0,					/* tp_getattr */
	0,					/* tp_setattr */
	0,					/* tp_compare */
	(reprfunc)fileio_repr,			/* 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_BASETYPE, /* tp_flags */
	fileio_doc,				/* tp_doc */
	0,					/* tp_traverse */
	0,					/* tp_clear */
	0,					/* tp_richcompare */
	offsetof(PyFileIOObject, weakreflist),	/* tp_weaklistoffset */
	0,					/* tp_iter */
	0,					/* tp_iternext */
	fileio_methods,				/* tp_methods */
	0,					/* tp_members */
	fileio_getsetlist,			/* tp_getset */
	0,					/* tp_base */
	0,					/* tp_dict */
	0,					/* tp_descr_get */
	0,					/* tp_descr_set */
	0,					/* tp_dictoffset */
	fileio_init,				/* tp_init */
	PyType_GenericAlloc,			/* tp_alloc */
	fileio_new,				/* tp_new */
	PyObject_Del,				/* tp_free */
};

static PyMethodDef module_methods[] = {
	{NULL, NULL}
};

PyMODINIT_FUNC
init_fileio(void)
{
	PyObject *m;	/* a module object */

	m = Py_InitModule3("_fileio", module_methods,
			   "Fast implementation of io.FileIO.");
	if (m == NULL)
		return;
	if (PyType_Ready(&PyFileIO_Type) < 0)
		return;
	Py_INCREF(&PyFileIO_Type);
	PyModule_AddObject(m, "_FileIO", (PyObject *) &PyFileIO_Type);
}
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.