cpython / Modules / timemodule.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
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
/* Time module */

#include "Python.h"
#include "structseq.h"
#include "timefuncs.h"

#define TZNAME_ENCODING "utf-8"

#ifdef __APPLE__
#if defined(HAVE_GETTIMEOFDAY) && defined(HAVE_FTIME)
  /*
   * floattime falls back to ftime when getttimeofday fails because the latter
   * might fail on some platforms. This fallback is unwanted on MacOSX because
   * that makes it impossible to use a binary build on OSX 10.4 on earlier
   * releases of the OS. Therefore claim we don't support ftime.
   */
# undef HAVE_FTIME
#endif
#endif

#include <ctype.h>

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif /* HAVE_SYS_TYPES_H */

#ifdef QUICKWIN
#include <io.h>
#endif

#ifdef HAVE_FTIME
#include <sys/timeb.h>
#if !defined(MS_WINDOWS) && !defined(PYOS_OS2)
extern int ftime(struct timeb *);
#endif /* MS_WINDOWS */
#endif /* HAVE_FTIME */

#if defined(__WATCOMC__) && !defined(__QNX__)
#include <i86.h>
#else
#ifdef MS_WINDOWS
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include "pythread.h"

/* helper to allow us to interrupt sleep() on Windows*/
static HANDLE hInterruptEvent = NULL;
static BOOL WINAPI PyCtrlHandler(DWORD dwCtrlType)
{
	SetEvent(hInterruptEvent);
	/* allow other default handlers to be called.
	   Default Python handler will setup the
	   KeyboardInterrupt exception.
	*/
	return FALSE;
}
static long main_thread;

#if defined(__BORLANDC__)
/* These overrides not needed for Win32 */
#define timezone _timezone
#define tzname _tzname
#define daylight _daylight
#endif /* __BORLANDC__ */
#endif /* MS_WINDOWS */
#endif /* !__WATCOMC__ || __QNX__ */

#if defined(MS_WINDOWS) && !defined(__BORLANDC__)
/* Win32 has better clock replacement; we have our own version below. */
#undef HAVE_CLOCK
#undef TZNAME_ENCODING
#define TZNAME_ENCODING "mbcs"
#endif /* MS_WINDOWS && !defined(__BORLANDC__) */

#if defined(PYOS_OS2)
#define INCL_DOS
#define INCL_ERRORS
#include <os2.h>
#endif

#if defined(PYCC_VACPP)
#include <sys/time.h>
#endif

/* Forward declarations */
static int floatsleep(double);
static double floattime(void);

/* For Y2K check */
static PyObject *moddict;

/* Exposed in timefuncs.h. */
time_t
_PyTime_DoubleToTimet(double x)
{
	time_t result;
	double diff;

	result = (time_t)x;
	/* How much info did we lose?  time_t may be an integral or
	 * floating type, and we don't know which.  If it's integral,
	 * we don't know whether C truncates, rounds, returns the floor,
	 * etc.  If we lost a second or more, the C rounding is
	 * unreasonable, or the input just doesn't fit in a time_t;
	 * call it an error regardless.  Note that the original cast to
	 * time_t can cause a C error too, but nothing we can do to
	 * worm around that.
	 */
	diff = x - (double)result;
	if (diff <= -1.0 || diff >= 1.0) {
		PyErr_SetString(PyExc_ValueError,
		                "timestamp out of range for platform time_t");
		result = (time_t)-1;
	}
	return result;
}

static PyObject *
time_time(PyObject *self, PyObject *unused)
{
	double secs;
	secs = floattime();
	if (secs == 0.0) {
		PyErr_SetFromErrno(PyExc_IOError);
		return NULL;
	}
	return PyFloat_FromDouble(secs);
}

PyDoc_STRVAR(time_doc,
"time() -> floating point number\n\
\n\
Return the current time in seconds since the Epoch.\n\
Fractions of a second may be present if the system clock provides them.");

#ifdef HAVE_CLOCK

#ifndef CLOCKS_PER_SEC
#ifdef CLK_TCK
#define CLOCKS_PER_SEC CLK_TCK
#else
#define CLOCKS_PER_SEC 1000000
#endif
#endif

static PyObject *
time_clock(PyObject *self, PyObject *unused)
{
	return PyFloat_FromDouble(((double)clock()) / CLOCKS_PER_SEC);
}
#endif /* HAVE_CLOCK */

#if defined(MS_WINDOWS) && !defined(__BORLANDC__)
/* Due to Mark Hammond and Tim Peters */
static PyObject *
time_clock(PyObject *self, PyObject *unused)
{
	static LARGE_INTEGER ctrStart;
	static double divisor = 0.0;
	LARGE_INTEGER now;
	double diff;

	if (divisor == 0.0) {
		LARGE_INTEGER freq;
		QueryPerformanceCounter(&ctrStart);
		if (!QueryPerformanceFrequency(&freq) || freq.QuadPart == 0) {
			/* Unlikely to happen - this works on all intel
			   machines at least!  Revert to clock() */
			return PyFloat_FromDouble(((double)clock()) /
						  CLOCKS_PER_SEC);
		}
		divisor = (double)freq.QuadPart;
	}
	QueryPerformanceCounter(&now);
	diff = (double)(now.QuadPart - ctrStart.QuadPart);
	return PyFloat_FromDouble(diff / divisor);
}

#define HAVE_CLOCK /* So it gets included in the methods */
#endif /* MS_WINDOWS && !defined(__BORLANDC__) */

#ifdef HAVE_CLOCK
PyDoc_STRVAR(clock_doc,
"clock() -> floating point number\n\
\n\
Return the CPU time or real time since the start of the process or since\n\
the first call to clock().  This has as much precision as the system\n\
records.");
#endif

static PyObject *
time_sleep(PyObject *self, PyObject *args)
{
	double secs;
	if (!PyArg_ParseTuple(args, "d:sleep", &secs))
		return NULL;
	if (floatsleep(secs) != 0)
		return NULL;
	Py_INCREF(Py_None);
	return Py_None;
}

PyDoc_STRVAR(sleep_doc,
"sleep(seconds)\n\
\n\
Delay execution for a given number of seconds.  The argument may be\n\
a floating point number for subsecond precision.");

static PyStructSequence_Field struct_time_type_fields[] = {
	{"tm_year", NULL},
	{"tm_mon", NULL},
	{"tm_mday", NULL},
	{"tm_hour", NULL},
	{"tm_min", NULL},
	{"tm_sec", NULL},
	{"tm_wday", NULL},
	{"tm_yday", NULL},
	{"tm_isdst", NULL},
	{0}
};

static PyStructSequence_Desc struct_time_type_desc = {
	"time.struct_time",
	NULL,
	struct_time_type_fields,
	9,
};

static int initialized;
static PyTypeObject StructTimeType;

static PyObject *
tmtotuple(struct tm *p)
{
	PyObject *v = PyStructSequence_New(&StructTimeType);
	if (v == NULL)
		return NULL;

#define SET(i,val) PyStructSequence_SET_ITEM(v, i, PyLong_FromLong((long) val))

	SET(0, p->tm_year + 1900);
	SET(1, p->tm_mon + 1);	   /* Want January == 1 */
	SET(2, p->tm_mday);
	SET(3, p->tm_hour);
	SET(4, p->tm_min);
	SET(5, p->tm_sec);
	SET(6, (p->tm_wday + 6) % 7); /* Want Monday == 0 */
	SET(7, p->tm_yday + 1);	   /* Want January, 1 == 1 */
	SET(8, p->tm_isdst);
#undef SET
	if (PyErr_Occurred()) {
		Py_XDECREF(v);
		return NULL;
	}

	return v;
}

static PyObject *
structtime_totuple(PyObject *t)
{
	PyObject *x = NULL;
	unsigned int i;
	PyObject *v = PyTuple_New(9);
	if (v == NULL)
		return NULL;

	for (i=0; i<9; i++) {
		x = PyStructSequence_GET_ITEM(t, i);
		Py_INCREF(x);
		PyTuple_SET_ITEM(v, i, x);
	}

	if (PyErr_Occurred()) {
		Py_XDECREF(v);
		return NULL;
	}

	return v;
}

static PyObject *
time_convert(double when, struct tm * (*function)(const time_t *))
{
	struct tm *p;
	time_t whent = _PyTime_DoubleToTimet(when);

	if (whent == (time_t)-1 && PyErr_Occurred())
		return NULL;
	errno = 0;
	p = function(&whent);
	if (p == NULL) {
#ifdef EINVAL
		if (errno == 0)
			errno = EINVAL;
#endif
		return PyErr_SetFromErrno(PyExc_ValueError);
	}
	return tmtotuple(p);
}

/* Parse arg tuple that can contain an optional float-or-None value;
   format needs to be "|O:name".
   Returns non-zero on success (parallels PyArg_ParseTuple).
*/
static int
parse_time_double_args(PyObject *args, char *format, double *pwhen)
{
	PyObject *ot = NULL;

	if (!PyArg_ParseTuple(args, format, &ot))
		return 0;
	if (ot == NULL || ot == Py_None)
		*pwhen = floattime();
	else {
		double when = PyFloat_AsDouble(ot);
		if (PyErr_Occurred())
			return 0;
		*pwhen = when;
	}
	return 1;
}

static PyObject *
time_gmtime(PyObject *self, PyObject *args)
{
	double when;
	if (!parse_time_double_args(args, "|O:gmtime", &when))
		return NULL;
	return time_convert(when, gmtime);
}

PyDoc_STRVAR(gmtime_doc,
"gmtime([seconds]) -> (tm_year, tm_mon, tm_mday, tm_hour, tm_min,\n\
                       tm_sec, tm_wday, tm_yday, tm_isdst)\n\
\n\
Convert seconds since the Epoch to a time tuple expressing UTC (a.k.a.\n\
GMT).  When 'seconds' is not passed in, convert the current time instead.");

static PyObject *
time_localtime(PyObject *self, PyObject *args)
{
	double when;
	if (!parse_time_double_args(args, "|O:localtime", &when))
		return NULL;
	return time_convert(when, localtime);
}

PyDoc_STRVAR(localtime_doc,
"localtime([seconds]) -> (tm_year,tm_mon,tm_mday,tm_hour,tm_min,\n\
			  tm_sec,tm_wday,tm_yday,tm_isdst)\n\
\n\
Convert seconds since the Epoch to a time tuple expressing local time.\n\
When 'seconds' is not passed in, convert the current time instead.");

static int
gettmarg(PyObject *args, struct tm *p)
{
	int y;
	PyObject *t = NULL;

	memset((void *) p, '\0', sizeof(struct tm));

	if (PyTuple_Check(args)) {
		t = args;
		Py_INCREF(t);
	}
	else if (Py_TYPE(args) == &StructTimeType) {
		t = structtime_totuple(args);
	}
	else {
		PyErr_SetString(PyExc_TypeError,
				"Tuple or struct_time argument required");
		return 0;
	}

	if (t == NULL || !PyArg_ParseTuple(t, "iiiiiiiii",
					   &y,
					   &p->tm_mon,
					   &p->tm_mday,
					   &p->tm_hour,
					   &p->tm_min,
					   &p->tm_sec,
					   &p->tm_wday,
					   &p->tm_yday,
					   &p->tm_isdst)) {
		Py_XDECREF(t);
		return 0;
	}
	Py_DECREF(t);

	if (y < 1900) {
		PyObject *accept = PyDict_GetItemString(moddict,
							"accept2dyear");
		if (accept == NULL || !PyLong_CheckExact(accept) ||
		    !PyObject_IsTrue(accept)) {
			PyErr_SetString(PyExc_ValueError,
					"year >= 1900 required");
			return 0;
		}
		if (69 <= y && y <= 99)
			y += 1900;
		else if (0 <= y && y <= 68)
			y += 2000;
		else {
			PyErr_SetString(PyExc_ValueError,
					"year out of range");
			return 0;
		}
	}
	p->tm_year = y - 1900;
	p->tm_mon--;
	p->tm_wday = (p->tm_wday + 1) % 7;
	p->tm_yday--;
	return 1;
}

#ifdef HAVE_STRFTIME
static PyObject *
time_strftime(PyObject *self, PyObject *args)
{
	PyObject *tup = NULL;
	struct tm buf;
	const char *fmt;
	PyObject *format;
	size_t fmtlen, buflen;
	char *outbuf = 0;
	size_t i;

	memset((void *) &buf, '\0', sizeof(buf));

	/* Will always expect a unicode string to be passed as format.
	   Given that there's no str type anymore in py3k this seems safe.
	*/
	if (!PyArg_ParseTuple(args, "U|O:strftime", &format, &tup))
		return NULL;

	if (tup == NULL) {
		time_t tt = time(NULL);
		buf = *localtime(&tt);
	} else if (!gettmarg(tup, &buf))
		return NULL;

        /* Checks added to make sure strftime() does not crash Python by
            indexing blindly into some array for a textual representation
            by some bad index (fixes bug #897625).

	    Also support values of zero from Python code for arguments in which
	    that is out of range by forcing that value to the lowest value that
	    is valid (fixed bug #1520914).

	    Valid ranges based on what is allowed in struct tm:

	    - tm_year: [0, max(int)] (1)
	    - tm_mon: [0, 11] (2)
	    - tm_mday: [1, 31]
	    - tm_hour: [0, 23]
	    - tm_min: [0, 59]
	    - tm_sec: [0, 60]
	    - tm_wday: [0, 6] (1)
	    - tm_yday: [0, 365] (2)
	    - tm_isdst: [-max(int), max(int)]

	    (1) gettmarg() handles bounds-checking.
	    (2) Python's acceptable range is one greater than the range in C,
	        thus need to check against automatic decrement by gettmarg().
        */
	if (buf.tm_mon == -1)
	    buf.tm_mon = 0;
	else if (buf.tm_mon < 0 || buf.tm_mon > 11) {
            PyErr_SetString(PyExc_ValueError, "month out of range");
                        return NULL;
        }
	if (buf.tm_mday == 0)
	    buf.tm_mday = 1;
	else if (buf.tm_mday < 0 || buf.tm_mday > 31) {
            PyErr_SetString(PyExc_ValueError, "day of month out of range");
                        return NULL;
        }
        if (buf.tm_hour < 0 || buf.tm_hour > 23) {
            PyErr_SetString(PyExc_ValueError, "hour out of range");
            return NULL;
        }
        if (buf.tm_min < 0 || buf.tm_min > 59) {
            PyErr_SetString(PyExc_ValueError, "minute out of range");
            return NULL;
        }
        if (buf.tm_sec < 0 || buf.tm_sec > 61) {
            PyErr_SetString(PyExc_ValueError, "seconds out of range");
            return NULL;
        }
        /* tm_wday does not need checking of its upper-bound since taking
        ``% 7`` in gettmarg() automatically restricts the range. */
        if (buf.tm_wday < 0) {
            PyErr_SetString(PyExc_ValueError, "day of week out of range");
            return NULL;
        }
	if (buf.tm_yday == -1)
	    buf.tm_yday = 0;
	else if (buf.tm_yday < 0 || buf.tm_yday > 365) {
            PyErr_SetString(PyExc_ValueError, "day of year out of range");
            return NULL;
        }
        if (buf.tm_isdst < -1 || buf.tm_isdst > 1) {
            PyErr_SetString(PyExc_ValueError,
                            "daylight savings flag out of range");
            return NULL;
        }

    /* Convert the unicode string to an ascii one */
    fmt = PyUnicode_AsString(format);

	fmtlen = strlen(fmt);

	/* I hate these functions that presume you know how big the output
	 * will be ahead of time...
	 */
	for (i = 1024; ; i += i) {
		outbuf = (char *)PyMem_Malloc(i);
		if (outbuf == NULL) {
			return PyErr_NoMemory();
		}
		buflen = strftime(outbuf, i, fmt, &buf);
		if (buflen > 0 || i >= 256 * fmtlen) {
			/* If the buffer is 256 times as long as the format,
			   it's probably not failing for lack of room!
			   More likely, the format yields an empty result,
			   e.g. an empty format, or %Z when the timezone
			   is unknown. */
			PyObject *ret;
			ret = PyUnicode_Decode(outbuf, buflen,
					       TZNAME_ENCODING, NULL);
			PyMem_Free(outbuf);
			return ret;
		}
		PyMem_Free(outbuf);
#if defined _MSC_VER && _MSC_VER >= 1400 && defined(__STDC_SECURE_LIB__)
		/* VisualStudio .NET 2005 does this properly */
		if (buflen == 0 && errno == EINVAL) {
			PyErr_SetString(PyExc_ValueError, "Invalid format string");
			return 0;
		}
#endif
	}
}

PyDoc_STRVAR(strftime_doc,
"strftime(format[, tuple]) -> string\n\
\n\
Convert a time tuple to a string according to a format specification.\n\
See the library reference manual for formatting codes. When the time tuple\n\
is not present, current time as returned by localtime() is used.");
#endif /* HAVE_STRFTIME */

static PyObject *
time_strptime(PyObject *self, PyObject *args)
{
    PyObject *strptime_module = PyImport_ImportModuleNoBlock("_strptime");
    PyObject *strptime_result;

    if (!strptime_module)
        return NULL;
    strptime_result = PyObject_CallMethod(strptime_module, "strptime", "O", args);
    Py_DECREF(strptime_module);
    return strptime_result;
}

PyDoc_STRVAR(strptime_doc,
"strptime(string, format) -> struct_time\n\
\n\
Parse a string to a time tuple according to a format specification.\n\
See the library reference manual for formatting codes (same as strftime()).");


static PyObject *
time_asctime(PyObject *self, PyObject *args)
{
	PyObject *tup = NULL;
	struct tm buf;
	char *p;
	if (!PyArg_UnpackTuple(args, "asctime", 0, 1, &tup))
		return NULL;
	if (tup == NULL) {
		time_t tt = time(NULL);
		buf = *localtime(&tt);
	} else if (!gettmarg(tup, &buf))
		return NULL;
	p = asctime(&buf);
	if (p[24] == '\n')
		p[24] = '\0';
	return PyUnicode_FromString(p);
}

PyDoc_STRVAR(asctime_doc,
"asctime([tuple]) -> string\n\
\n\
Convert a time tuple to a string, e.g. 'Sat Jun 06 16:26:11 1998'.\n\
When the time tuple is not present, current time as returned by localtime()\n\
is used.");

static PyObject *
time_ctime(PyObject *self, PyObject *args)
{
	PyObject *ot = NULL;
	time_t tt;
	char *p;

	if (!PyArg_UnpackTuple(args, "ctime", 0, 1, &ot))
		return NULL;
	if (ot == NULL || ot == Py_None)
		tt = time(NULL);
	else {
		double dt = PyFloat_AsDouble(ot);
		if (PyErr_Occurred())
			return NULL;
		tt = _PyTime_DoubleToTimet(dt);
		if (tt == (time_t)-1 && PyErr_Occurred())
			return NULL;
	}
	p = ctime(&tt);
	if (p == NULL) {
		PyErr_SetString(PyExc_ValueError, "unconvertible time");
		return NULL;
	}
	if (p[24] == '\n')
		p[24] = '\0';
	return PyUnicode_FromString(p);
}

PyDoc_STRVAR(ctime_doc,
"ctime(seconds) -> string\n\
\n\
Convert a time in seconds since the Epoch to a string in local time.\n\
This is equivalent to asctime(localtime(seconds)). When the time tuple is\n\
not present, current time as returned by localtime() is used.");

#ifdef HAVE_MKTIME
static PyObject *
time_mktime(PyObject *self, PyObject *tup)
{
	struct tm buf;
	time_t tt;
	tt = time(&tt);
	buf = *localtime(&tt);
	if (!gettmarg(tup, &buf))
		return NULL;
	tt = mktime(&buf);
	if (tt == (time_t)(-1)) {
		PyErr_SetString(PyExc_OverflowError,
				"mktime argument out of range");
		return NULL;
	}
	return PyFloat_FromDouble((double)tt);
}

PyDoc_STRVAR(mktime_doc,
"mktime(tuple) -> floating point number\n\
\n\
Convert a time tuple in local time to seconds since the Epoch.");
#endif /* HAVE_MKTIME */

#ifdef HAVE_WORKING_TZSET
void inittimezone(PyObject *module);

static PyObject *
time_tzset(PyObject *self, PyObject *unused)
{
	PyObject* m;

	m = PyImport_ImportModuleNoBlock("time");
	if (m == NULL) {
	    return NULL;
	}

	tzset();

	/* Reset timezone, altzone, daylight and tzname */
	inittimezone(m);
	Py_DECREF(m);

	Py_INCREF(Py_None);
	return Py_None;
}

PyDoc_STRVAR(tzset_doc,
"tzset(zone)\n\
\n\
Initialize, or reinitialize, the local timezone to the value stored in\n\
os.environ['TZ']. The TZ environment variable should be specified in\n\
standard Unix timezone format as documented in the tzset man page\n\
(eg. 'US/Eastern', 'Europe/Amsterdam'). Unknown timezones will silently\n\
fall back to UTC. If the TZ environment variable is not set, the local\n\
timezone is set to the systems best guess of wallclock time.\n\
Changing the TZ environment variable without calling tzset *may* change\n\
the local timezone used by methods such as localtime, but this behaviour\n\
should not be relied on.");
#endif /* HAVE_WORKING_TZSET */

void inittimezone(PyObject *m) {
    /* This code moved from inittime wholesale to allow calling it from
	time_tzset. In the future, some parts of it can be moved back
	(for platforms that don't HAVE_WORKING_TZSET, when we know what they
	are), and the extranious calls to tzset(3) should be removed.
	I haven't done this yet, as I don't want to change this code as
	little as possible when introducing the time.tzset and time.tzsetwall
	methods. This should simply be a method of doing the following once,
	at the top of this function and removing the call to tzset() from
	time_tzset():

	    #ifdef HAVE_TZSET
	    tzset()
	    #endif

	And I'm lazy and hate C so nyer.
     */
#if defined(HAVE_TZNAME) && !defined(__GLIBC__) && !defined(__CYGWIN__)
	PyObject *otz0, *otz1;
	tzset();
#ifdef PYOS_OS2
	PyModule_AddIntConstant(m, "timezone", _timezone);
#else /* !PYOS_OS2 */
	PyModule_AddIntConstant(m, "timezone", timezone);
#endif /* PYOS_OS2 */
#ifdef HAVE_ALTZONE
	PyModule_AddIntConstant(m, "altzone", altzone);
#else
#ifdef PYOS_OS2
	PyModule_AddIntConstant(m, "altzone", _timezone-3600);
#else /* !PYOS_OS2 */
	PyModule_AddIntConstant(m, "altzone", timezone-3600);
#endif /* PYOS_OS2 */
#endif
	PyModule_AddIntConstant(m, "daylight", daylight);
	otz0 = PyUnicode_Decode(tzname[0], strlen(tzname[0]), TZNAME_ENCODING, NULL);
	otz1 = PyUnicode_Decode(tzname[1], strlen(tzname[1]), TZNAME_ENCODING, NULL);
	PyModule_AddObject(m, "tzname", Py_BuildValue("(NN)", otz0, otz1));
#else /* !HAVE_TZNAME || __GLIBC__ || __CYGWIN__*/
#ifdef HAVE_STRUCT_TM_TM_ZONE
	{
#define YEAR ((time_t)((365 * 24 + 6) * 3600))
		time_t t;
		struct tm *p;
		long janzone, julyzone;
		char janname[10], julyname[10];
		t = (time((time_t *)0) / YEAR) * YEAR;
		p = localtime(&t);
		janzone = -p->tm_gmtoff;
		strncpy(janname, p->tm_zone ? p->tm_zone : "   ", 9);
		janname[9] = '\0';
		t += YEAR/2;
		p = localtime(&t);
		julyzone = -p->tm_gmtoff;
		strncpy(julyname, p->tm_zone ? p->tm_zone : "   ", 9);
		julyname[9] = '\0';

		if( janzone < julyzone ) {
			/* DST is reversed in the southern hemisphere */
			PyModule_AddIntConstant(m, "timezone", julyzone);
			PyModule_AddIntConstant(m, "altzone", janzone);
			PyModule_AddIntConstant(m, "daylight",
						janzone != julyzone);
			PyModule_AddObject(m, "tzname",
					   Py_BuildValue("(zz)",
							 julyname, janname));
		} else {
			PyModule_AddIntConstant(m, "timezone", janzone);
			PyModule_AddIntConstant(m, "altzone", julyzone);
			PyModule_AddIntConstant(m, "daylight",
						janzone != julyzone);
			PyModule_AddObject(m, "tzname",
					   Py_BuildValue("(zz)",
							 janname, julyname));
		}
	}
#else
#endif /* HAVE_STRUCT_TM_TM_ZONE */
#ifdef __CYGWIN__
	tzset();
	PyModule_AddIntConstant(m, "timezone", _timezone);
	PyModule_AddIntConstant(m, "altzone", _timezone-3600);
	PyModule_AddIntConstant(m, "daylight", _daylight);
	PyModule_AddObject(m, "tzname",
			   Py_BuildValue("(zz)", _tzname[0], _tzname[1]));
#endif /* __CYGWIN__ */
#endif /* !HAVE_TZNAME || __GLIBC__ || __CYGWIN__*/
}


static PyMethodDef time_methods[] = {
	{"time",	time_time, METH_NOARGS, time_doc},
#ifdef HAVE_CLOCK
	{"clock",	time_clock, METH_NOARGS, clock_doc},
#endif
	{"sleep",	time_sleep, METH_VARARGS, sleep_doc},
	{"gmtime",	time_gmtime, METH_VARARGS, gmtime_doc},
	{"localtime",	time_localtime, METH_VARARGS, localtime_doc},
	{"asctime",	time_asctime, METH_VARARGS, asctime_doc},
	{"ctime",	time_ctime, METH_VARARGS, ctime_doc},
#ifdef HAVE_MKTIME
	{"mktime",	time_mktime, METH_O, mktime_doc},
#endif
#ifdef HAVE_STRFTIME
	{"strftime",	time_strftime, METH_VARARGS, strftime_doc},
#endif
	{"strptime",	time_strptime, METH_VARARGS, strptime_doc},
#ifdef HAVE_WORKING_TZSET
	{"tzset",	time_tzset, METH_NOARGS, tzset_doc},
#endif
	{NULL,		NULL}		/* sentinel */
};


PyDoc_STRVAR(module_doc,
"This module provides various functions to manipulate time values.\n\
\n\
There are two standard representations of time.  One is the number\n\
of seconds since the Epoch, in UTC (a.k.a. GMT).  It may be an integer\n\
or a floating point number (to represent fractions of seconds).\n\
The Epoch is system-defined; on Unix, it is generally January 1st, 1970.\n\
The actual value can be retrieved by calling gmtime(0).\n\
\n\
The other representation is a tuple of 9 integers giving local time.\n\
The tuple items are:\n\
  year (four digits, e.g. 1998)\n\
  month (1-12)\n\
  day (1-31)\n\
  hours (0-23)\n\
  minutes (0-59)\n\
  seconds (0-59)\n\
  weekday (0-6, Monday is 0)\n\
  Julian day (day in the year, 1-366)\n\
  DST (Daylight Savings Time) flag (-1, 0 or 1)\n\
If the DST flag is 0, the time is given in the regular time zone;\n\
if it is 1, the time is given in the DST time zone;\n\
if it is -1, mktime() should guess based on the date and time.\n\
\n\
Variables:\n\
\n\
timezone -- difference in seconds between UTC and local standard time\n\
altzone -- difference in  seconds between UTC and local DST time\n\
daylight -- whether local time should reflect DST\n\
tzname -- tuple of (standard time zone name, DST time zone name)\n\
\n\
Functions:\n\
\n\
time() -- return current time in seconds since the Epoch as a float\n\
clock() -- return CPU time since process start as a float\n\
sleep() -- delay for a number of seconds given as a float\n\
gmtime() -- convert seconds since Epoch to UTC tuple\n\
localtime() -- convert seconds since Epoch to local time tuple\n\
asctime() -- convert time tuple to string\n\
ctime() -- convert time in seconds to string\n\
mktime() -- convert local time tuple to seconds since Epoch\n\
strftime() -- convert time tuple to string according to format specification\n\
strptime() -- parse string to time tuple according to format specification\n\
tzset() -- change the local timezone");


PyMODINIT_FUNC
inittime(void)
{
	PyObject *m;
	char *p;
	m = Py_InitModule3("time", time_methods, module_doc);
	if (m == NULL)
		return;

	/* Accept 2-digit dates unless PYTHONY2K is set and non-empty */
	p = Py_GETENV("PYTHONY2K");
	PyModule_AddIntConstant(m, "accept2dyear", (long) (!p || !*p));
	/* Squirrel away the module's dictionary for the y2k check */
	moddict = PyModule_GetDict(m);
	Py_INCREF(moddict);

	/* Set, or reset, module variables like time.timezone */
	inittimezone(m);

#ifdef MS_WINDOWS
	/* Helper to allow interrupts for Windows.
	   If Ctrl+C event delivered while not sleeping
	   it will be ignored.
	*/
	main_thread = PyThread_get_thread_ident();
	hInterruptEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
	SetConsoleCtrlHandler( PyCtrlHandler, TRUE);
#endif /* MS_WINDOWS */
	if (!initialized) {
		PyStructSequence_InitType(&StructTimeType,
					  &struct_time_type_desc);
	}
	Py_INCREF(&StructTimeType);
	PyModule_AddObject(m, "struct_time", (PyObject*) &StructTimeType);
	initialized = 1;
}


/* Implement floattime() for various platforms */

static double
floattime(void)
{
	/* There are three ways to get the time:
	  (1) gettimeofday() -- resolution in microseconds
	  (2) ftime() -- resolution in milliseconds
	  (3) time() -- resolution in seconds
	  In all cases the return value is a float in seconds.
	  Since on some systems (e.g. SCO ODT 3.0) gettimeofday() may
	  fail, so we fall back on ftime() or time().
	  Note: clock resolution does not imply clock accuracy! */
#ifdef HAVE_GETTIMEOFDAY
	{
		struct timeval t;
#ifdef GETTIMEOFDAY_NO_TZ
		if (gettimeofday(&t) == 0)
			return (double)t.tv_sec + t.tv_usec*0.000001;
#else /* !GETTIMEOFDAY_NO_TZ */
		if (gettimeofday(&t, (struct timezone *)NULL) == 0)
			return (double)t.tv_sec + t.tv_usec*0.000001;
#endif /* !GETTIMEOFDAY_NO_TZ */
	}

#endif /* !HAVE_GETTIMEOFDAY */
	{
#if defined(HAVE_FTIME)
		struct timeb t;
		ftime(&t);
		return (double)t.time + (double)t.millitm * (double)0.001;
#else /* !HAVE_FTIME */
		time_t secs;
		time(&secs);
		return (double)secs;
#endif /* !HAVE_FTIME */
	}
}


/* Implement floatsleep() for various platforms.
   When interrupted (or when another error occurs), return -1 and
   set an exception; else return 0. */

static int
floatsleep(double secs)
{
/* XXX Should test for MS_WINDOWS first! */
#if defined(HAVE_SELECT) && !defined(__EMX__)
	struct timeval t;
	double frac;
	frac = fmod(secs, 1.0);
	secs = floor(secs);
	t.tv_sec = (long)secs;
	t.tv_usec = (long)(frac*1000000.0);
	Py_BEGIN_ALLOW_THREADS
	if (select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &t) != 0) {
#ifdef EINTR
		if (errno != EINTR) {
#else
		if (1) {
#endif
			Py_BLOCK_THREADS
			PyErr_SetFromErrno(PyExc_IOError);
			return -1;
		}
	}
	Py_END_ALLOW_THREADS
#elif defined(__WATCOMC__) && !defined(__QNX__)
	/* XXX Can't interrupt this sleep */
	Py_BEGIN_ALLOW_THREADS
	delay((int)(secs * 1000 + 0.5));  /* delay() uses milliseconds */
	Py_END_ALLOW_THREADS
#elif defined(MS_WINDOWS)
	{
		double millisecs = secs * 1000.0;
		unsigned long ul_millis;

		if (millisecs > (double)ULONG_MAX) {
			PyErr_SetString(PyExc_OverflowError,
					"sleep length is too large");
			return -1;
		}
		Py_BEGIN_ALLOW_THREADS
		/* Allow sleep(0) to maintain win32 semantics, and as decreed
		 * by Guido, only the main thread can be interrupted.
		 */
		ul_millis = (unsigned long)millisecs;
		if (ul_millis == 0 ||
		    main_thread != PyThread_get_thread_ident())
			Sleep(ul_millis);
		else {
			DWORD rc;
			ResetEvent(hInterruptEvent);
			rc = WaitForSingleObject(hInterruptEvent, ul_millis);
			if (rc == WAIT_OBJECT_0) {
				/* Yield to make sure real Python signal
				 * handler called.
				 */
				Sleep(1);
				Py_BLOCK_THREADS
				errno = EINTR;
				PyErr_SetFromErrno(PyExc_IOError);
				return -1;
			}
		}
		Py_END_ALLOW_THREADS
	}
#elif defined(PYOS_OS2)
	/* This Sleep *IS* Interruptable by Exceptions */
	Py_BEGIN_ALLOW_THREADS
	if (DosSleep(secs * 1000) != NO_ERROR) {
		Py_BLOCK_THREADS
		PyErr_SetFromErrno(PyExc_IOError);
		return -1;
	}
	Py_END_ALLOW_THREADS
#elif defined(PLAN9)
	{
		double millisecs = secs * 1000.0;
		if (millisecs > (double)LONG_MAX) {
			PyErr_SetString(PyExc_OverflowError, "sleep length is too large");
			return -1;
		}
		/* This sleep *CAN BE* interrupted. */
		Py_BEGIN_ALLOW_THREADS
		if(sleep((long)millisecs) < 0){
			Py_BLOCK_THREADS
			PyErr_SetFromErrno(PyExc_IOError);
			return -1;
		}
		Py_END_ALLOW_THREADS
	}
#else
	/* XXX Can't interrupt this sleep */
	Py_BEGIN_ALLOW_THREADS
	sleep((int)secs);
	Py_END_ALLOW_THREADS
#endif

	return 0;
}
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.