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Copy pathtimemodule.c
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2463 lines (2138 loc) · 66.1 KB
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/* Time module */
#include "Python.h"
#include "pycore_fileutils.h" // _Py_BEGIN_SUPPRESS_IPH
#include "pycore_moduleobject.h" // _PyModule_GetState()
#include "pycore_namespace.h" // _PyNamespace_New()
#include "pycore_runtime.h" // _Py_ID()
#include "pycore_structseq.h" // _PyStructSequence_NewType()
#include "pycore_time.h" // _PyTimeFraction
#include <time.h> // clock()
#ifdef HAVE_SYS_TIMES_H
# include <sys/times.h> // times()
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#if defined(HAVE_SYS_RESOURCE_H)
# include <sys/resource.h> // getrusage(RUSAGE_SELF)
#endif
#ifdef QUICKWIN
# include <io.h>
#endif
#if defined(HAVE_PTHREAD_H)
# include <pthread.h> // pthread_getcpuclockid()
#endif
#if defined(_AIX)
# include <sys/thread.h>
#endif
#if defined(__WATCOMC__) && !defined(__QNX__)
# include <i86.h>
#else
# ifdef MS_WINDOWS
# ifndef WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN
# endif
# include <windows.h>
# endif /* MS_WINDOWS */
#endif /* !__WATCOMC__ || __QNX__ */
#ifdef _Py_MEMORY_SANITIZER
# include <sanitizer/msan_interface.h>
#endif
#ifdef _MSC_VER
# define _Py_timezone _timezone
# define _Py_daylight _daylight
# define _Py_tzname _tzname
#else
# define _Py_timezone timezone
# define _Py_daylight daylight
# define _Py_tzname tzname
#endif
#if defined(__APPLE__ ) && defined(__has_builtin)
# if __has_builtin(__builtin_available)
# define HAVE_CLOCK_GETTIME_RUNTIME __builtin_available(macOS 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *)
# endif
#endif
#ifndef HAVE_CLOCK_GETTIME_RUNTIME
# define HAVE_CLOCK_GETTIME_RUNTIME 1
#endif
#define SEC_TO_NS (1000 * 1000 * 1000)
/*[clinic input]
module time
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=a668a08771581f36]*/
/* Forward declarations */
static int pysleep(PyTime_t timeout);
typedef struct {
PyTypeObject *struct_time_type;
// gh-115714: Don't use times() on WASI.
#if defined(HAVE_TIMES) && !defined(__wasi__)
// times() clock frequency in hertz
_PyTimeFraction times_base;
#endif
#ifdef HAVE_CLOCK
// clock() frequency in hertz
_PyTimeFraction clock_base;
#endif
} time_module_state;
static inline time_module_state*
get_time_state(PyObject *module)
{
void *state = _PyModule_GetState(module);
assert(state != NULL);
return (time_module_state *)state;
}
/*[clinic input]
time.time -> double
Return the current time in seconds since the Epoch.
Fractions of a second may be present if the system clock provides
them.
[clinic start generated code]*/
static double
time_time_impl(PyObject *module)
/*[clinic end generated code: output=4adfc457b48923ca input=eea2e80c63bbcaad]*/
{
PyTime_t t;
if (PyTime_Time(&t) < 0) {
return -1.0;
}
return PyTime_AsSecondsDouble(t);
}
/*[clinic input]
time.time_ns
Return the current time in nanoseconds since the Epoch.
[clinic start generated code]*/
static PyObject *
time_time_ns_impl(PyObject *module)
/*[clinic end generated code: output=f5f1924ebdcf1cf3 input=3acccd9786731be4]*/
{
PyTime_t t;
if (PyTime_Time(&t) < 0) {
return NULL;
}
return PyLong_FromInt64(t);
}
#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 int
py_clock(time_module_state *state, PyTime_t *tp, _Py_clock_info_t *info)
{
_PyTimeFraction *base = &state->clock_base;
if (info) {
info->implementation = "clock()";
info->resolution = _PyTimeFraction_Resolution(base);
info->monotonic = 1;
info->adjustable = 0;
}
clock_t ticks = clock();
if (ticks == (clock_t)-1) {
PyErr_SetString(PyExc_RuntimeError,
"the processor time used is not available "
"or its value cannot be represented");
return -1;
}
*tp = _PyTimeFraction_Mul(ticks, base);
return 0;
}
#endif /* HAVE_CLOCK */
#ifdef HAVE_CLOCK_GETTIME
#ifdef __APPLE__
/*
* The clock_* functions will be removed from the module
* dict entirely when the C API is not available.
*/
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunguarded-availability"
#endif
static int
time_clockid_converter(PyObject *obj, clockid_t *p)
{
#ifdef _AIX
long long clk_id = PyLong_AsLongLong(obj);
#elif defined(__DragonFly__) || defined(__CYGWIN__)
long clk_id = PyLong_AsLong(obj);
#else
int clk_id = PyLong_AsInt(obj);
#endif
if (clk_id == -1 && PyErr_Occurred()) {
PyErr_Format(PyExc_TypeError,
"clk_id should be integer, not %s",
_PyType_Name(Py_TYPE(obj)));
return 0;
}
// Make sure that we picked the right type (check sizes type)
Py_BUILD_ASSERT(sizeof(clk_id) == sizeof(*p));
*p = (clockid_t)clk_id;
return 1;
}
/*[python input]
class clockid_t_converter(CConverter):
type = "clockid_t"
converter = 'time_clockid_converter'
[python start generated code]*/
/*[python end generated code: output=da39a3ee5e6b4b0d input=53867111501f46c8]*/
/*[clinic input]
time.clock_gettime
clk_id: clockid_t
/
Return the time of the specified clock clk_id as a float.
[clinic start generated code]*/
static PyObject *
time_clock_gettime_impl(PyObject *module, clockid_t clk_id)
/*[clinic end generated code: output=832b9ebc03328020 input=7e89fcc42ca15e5d]*/
{
struct timespec tp;
int ret = clock_gettime(clk_id, &tp);
if (ret != 0) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
return PyFloat_FromDouble(tp.tv_sec + tp.tv_nsec * 1e-9);
}
/*[clinic input]
time.clock_gettime_ns
clk_id: clockid_t
/
Return the time of the specified clock clk_id as nanoseconds (int).
[clinic start generated code]*/
static PyObject *
time_clock_gettime_ns_impl(PyObject *module, clockid_t clk_id)
/*[clinic end generated code: output=4a045c3a36e60044 input=aabc248db8c8e3e5]*/
{
struct timespec ts;
int ret = clock_gettime(clk_id, &ts);
if (ret != 0) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
PyTime_t t;
if (_PyTime_FromTimespec(&t, &ts) < 0) {
return NULL;
}
return PyLong_FromInt64(t);
}
#endif /* HAVE_CLOCK_GETTIME */
#ifdef HAVE_CLOCK_SETTIME
/*[clinic input]
time.clock_settime
clk_id: int
time as obj: object
/
Set the time of the specified clock clk_id.
[clinic start generated code]*/
static PyObject *
time_clock_settime_impl(PyObject *module, int clk_id, PyObject *obj)
/*[clinic end generated code: output=ff2fc2e129f5fdea input=0e71daa237ff6edc]*/
{
PyTime_t t;
struct timespec tp;
int ret;
if (_PyTime_FromSecondsObject(&t, obj, _PyTime_ROUND_FLOOR) < 0)
return NULL;
if (_PyTime_AsTimespec(t, &tp) == -1)
return NULL;
ret = clock_settime((clockid_t)clk_id, &tp);
if (ret != 0) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
Py_RETURN_NONE;
}
/*[clinic input]
time.clock_settime_ns
clk_id: int
time as obj: object
/
Set the time of the specified clock clk_id with nanoseconds.
[clinic start generated code]*/
static PyObject *
time_clock_settime_ns_impl(PyObject *module, int clk_id, PyObject *obj)
/*[clinic end generated code: output=5d40ca0217bfe058 input=f2333aae32a7f441]*/
{
PyTime_t t;
struct timespec ts;
int ret;
if (PyLong_AsInt64(obj, &t) < 0) {
return NULL;
}
if (_PyTime_AsTimespec(t, &ts) == -1) {
return NULL;
}
ret = clock_settime((clockid_t)clk_id, &ts);
if (ret != 0) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
Py_RETURN_NONE;
}
#endif /* HAVE_CLOCK_SETTIME */
#ifdef HAVE_CLOCK_GETRES
/*[clinic input]
time.clock_getres -> double
clk_id: int
/
Return the resolution (precision) of the specified clock clk_id.
[clinic start generated code]*/
static double
time_clock_getres_impl(PyObject *module, int clk_id)
/*[clinic end generated code: output=94c4fb7df9f0c2f2 input=d1409a8b5b3be180]*/
{
int ret;
struct timespec tp;
ret = clock_getres((clockid_t)clk_id, &tp);
if (ret != 0) {
PyErr_SetFromErrno(PyExc_OSError);
return -1.0;
}
return tp.tv_sec + tp.tv_nsec * 1e-9;
}
#ifdef __APPLE__
#pragma clang diagnostic pop
#endif
#endif /* HAVE_CLOCK_GETRES */
#ifdef HAVE_PTHREAD_GETCPUCLOCKID
/*[clinic input]
time.pthread_getcpuclockid
thread_id: unsigned_long(bitwise=True)
/
Return the clk_id of a thread's CPU time clock.
[clinic start generated code]*/
static PyObject *
time_pthread_getcpuclockid_impl(PyObject *module, unsigned long thread_id)
/*[clinic end generated code: output=4fc7d4cb73d2e894 input=eb8af7bbcf189270]*/
{
int err;
clockid_t clk_id;
err = pthread_getcpuclockid((pthread_t)thread_id, &clk_id);
if (err) {
errno = err;
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
#ifdef _Py_MEMORY_SANITIZER
__msan_unpoison(&clk_id, sizeof(clk_id));
#endif
return PyLong_FromLong(clk_id);
}
#endif /* HAVE_PTHREAD_GETCPUCLOCKID */
/*[clinic input]
time.sleep
seconds as timeout_obj: object
/
Delay execution for a given number of seconds.
The argument may be a floating-point number for subsecond precision.
[clinic start generated code]*/
static PyObject *
time_sleep(PyObject *module, PyObject *timeout_obj)
/*[clinic end generated code: output=f46e88f5f5756f65 input=3928b1704a2faa12]*/
{
if (PySys_Audit("time.sleep", "O", timeout_obj) < 0) {
return NULL;
}
PyTime_t timeout;
if (_PyTime_FromSecondsObject(&timeout, timeout_obj, _PyTime_ROUND_TIMEOUT))
return NULL;
if (timeout < 0) {
PyErr_SetString(PyExc_ValueError,
"sleep length must be non-negative");
return NULL;
}
if (pysleep(timeout) != 0) {
return NULL;
}
Py_RETURN_NONE;
}
static PyStructSequence_Field struct_time_type_fields[] = {
{"tm_year", "year, for example, 1993"},
{"tm_mon", "month of year, range [1, 12]"},
{"tm_mday", "day of month, range [1, 31]"},
{"tm_hour", "hours, range [0, 23]"},
{"tm_min", "minutes, range [0, 59]"},
{"tm_sec", "seconds, range [0, 61])"},
{"tm_wday", "day of week, range [0, 6], Monday is 0"},
{"tm_yday", "day of year, range [1, 366]"},
{"tm_isdst", "1 if summer time is in effect, 0 if not, and -1 if unknown"},
{"tm_zone", "abbreviation of timezone name"},
{"tm_gmtoff", "offset from UTC in seconds"},
{0}
};
static PyStructSequence_Desc struct_time_type_desc = {
"time.struct_time",
"The time value as returned by gmtime(), localtime(), and strptime(), and\n"
" accepted by asctime(), mktime() and strftime(). May be considered as a\n"
" sequence of 9 integers.\n\n"
" Note that several fields' values are not the same as those defined by\n"
" the C language standard for struct tm. For example, the value of the\n"
" field tm_year is the actual year, not year - 1900. See individual\n"
" fields' descriptions for details.",
struct_time_type_fields,
9,
};
#if defined(MS_WINDOWS)
#ifndef CREATE_WAITABLE_TIMER_HIGH_RESOLUTION
#define CREATE_WAITABLE_TIMER_HIGH_RESOLUTION 0x00000002
#endif
static DWORD timer_flags = (DWORD)-1;
#endif
static PyObject *
tmtotuple(time_module_state *state, struct tm *p
#ifndef HAVE_STRUCT_TM_TM_ZONE
, const char *zone, time_t gmtoff
#endif
)
{
PyObject *v = PyStructSequence_New(state->struct_time_type);
if (v == NULL)
return NULL;
#define SET_ITEM(INDEX, CALL) \
do { \
PyObject *obj = (CALL); \
if (obj == NULL) { \
Py_DECREF(v); \
return NULL; \
} \
PyStructSequence_SET_ITEM(v, (INDEX), obj); \
} while (0)
#define SET(INDEX, VAL) \
SET_ITEM((INDEX), 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);
#ifdef HAVE_STRUCT_TM_TM_ZONE
SET_ITEM(9, PyUnicode_DecodeLocale(p->tm_zone, "surrogateescape"));
SET(10, p->tm_gmtoff);
#else
SET_ITEM(9, PyUnicode_DecodeLocale(zone, "surrogateescape"));
SET_ITEM(10, _PyLong_FromTime_t(gmtoff));
#endif /* HAVE_STRUCT_TM_TM_ZONE */
#undef SET
#undef SET_ITEM
return v;
}
/* Convert a number of seconds since the Epoch, or None which means the
current time, to time_t.
Returns non-zero on success (parallels PyArg_ParseTuple).
*/
static int
parse_time_t_arg(PyObject *ot, time_t *pwhen)
{
time_t whent;
if (ot == Py_None) {
whent = time(NULL);
}
else {
if (_PyTime_ObjectToTime_t(ot, &whent, _PyTime_ROUND_FLOOR) == -1)
return 0;
}
*pwhen = whent;
return 1;
}
/*[clinic input]
time.gmtime
seconds as ot: object = None
/
Convert seconds since the Epoch to a time tuple expressing UTC.
That is, Greenwich Mean Time. When 'seconds' is not passed in, convert
the current time instead.
If the platform supports the tm_gmtoff and tm_zone, they are available
as attributes only.
[clinic start generated code]*/
static PyObject *
time_gmtime_impl(PyObject *module, PyObject *ot)
/*[clinic end generated code: output=375372dd236a6ed6 input=784de5b57649d4d7]*/
{
time_t when;
struct tm buf;
if (!parse_time_t_arg(ot, &when))
return NULL;
errno = 0;
if (_PyTime_gmtime(when, &buf) != 0)
return NULL;
time_module_state *state = get_time_state(module);
#ifdef HAVE_STRUCT_TM_TM_ZONE
return tmtotuple(state, &buf);
#else
return tmtotuple(state, &buf, "UTC", 0);
#endif
}
#ifndef HAVE_TIMEGM
static time_t
timegm(struct tm *p)
{
/* XXX: the following implementation will not work for tm_year < 1970.
but it is likely that platforms that don't have timegm do not support
negative timestamps anyways. */
return p->tm_sec + p->tm_min*60 + p->tm_hour*3600 + p->tm_yday*86400 +
(p->tm_year-70)*31536000 + ((p->tm_year-69)/4)*86400 -
((p->tm_year-1)/100)*86400 + ((p->tm_year+299)/400)*86400;
}
#endif
/*[clinic input]
time.localtime
seconds as ot: object = None
/
Convert seconds since the Epoch to a time tuple expressing local time.
When 'seconds' is not passed in, convert the current time instead.
[clinic start generated code]*/
static PyObject *
time_localtime_impl(PyObject *module, PyObject *ot)
/*[clinic end generated code: output=d3c1c6818abd34a1 input=43b4e8bf4914300e]*/
{
time_t when;
struct tm buf;
if (!parse_time_t_arg(ot, &when))
return NULL;
if (_PyTime_localtime(when, &buf) != 0)
return NULL;
time_module_state *state = get_time_state(module);
#ifdef HAVE_STRUCT_TM_TM_ZONE
return tmtotuple(state, &buf);
#else
{
struct tm local = buf;
char zone[100];
time_t gmtoff;
strftime(zone, sizeof(zone), "%Z", &buf);
gmtoff = timegm(&buf) - when;
return tmtotuple(state, &local, zone, gmtoff);
}
#endif
}
#if defined(__linux__) && !defined(__GLIBC__)
static const char *utc_string = NULL;
#endif
/* Convert 9-item tuple to tm structure. Return 1 on success, set
* an exception and return 0 on error.
*/
static int
gettmarg(time_module_state *state, PyObject *args,
struct tm *p, const char *format)
{
int y;
memset((void *) p, '\0', sizeof(struct tm));
if (!PyTuple_Check(args)) {
PyErr_SetString(PyExc_TypeError,
"Tuple or struct_time argument required");
return 0;
}
if (!PyArg_ParseTuple(args, format,
&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))
return 0;
if (y < INT_MIN + 1900) {
PyErr_SetString(PyExc_OverflowError, "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--;
#ifdef HAVE_STRUCT_TM_TM_ZONE
if (Py_IS_TYPE(args, state->struct_time_type)) {
PyObject *item;
item = PyStructSequence_GET_ITEM(args, 9);
if (item != Py_None) {
p->tm_zone = (char *)PyUnicode_AsUTF8(item);
if (p->tm_zone == NULL) {
return 0;
}
#if defined(__linux__) && !defined(__GLIBC__)
// Make an attempt to return the C library's own timezone strings to
// it. musl refuses to process a tm_zone field unless it produced
// it. See issue #34672.
if (utc_string && strcmp(p->tm_zone, utc_string) == 0) {
p->tm_zone = utc_string;
}
else if (tzname[0] && strcmp(p->tm_zone, tzname[0]) == 0) {
p->tm_zone = tzname[0];
}
else if (tzname[1] && strcmp(p->tm_zone, tzname[1]) == 0) {
p->tm_zone = tzname[1];
}
#endif
}
item = PyStructSequence_GET_ITEM(args, 10);
if (item != Py_None) {
p->tm_gmtoff = PyLong_AsLong(item);
if (PyErr_Occurred())
return 0;
}
}
#endif /* HAVE_STRUCT_TM_TM_ZONE */
return 1;
}
/* Check values of the struct tm fields before it is passed to strftime() and
* asctime(). Return 1 if all values are valid, otherwise set an exception
* and returns 0.
*/
static int
checktm(struct tm* buf)
{
/* Checks added to make sure strftime() and asctime() does not crash Python by
indexing blindly into some array for a textual representation
by some bad index (fixes bug #897625 and #6608).
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 0;
}
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 0;
}
if (buf->tm_hour < 0 || buf->tm_hour > 23) {
PyErr_SetString(PyExc_ValueError, "hour out of range");
return 0;
}
if (buf->tm_min < 0 || buf->tm_min > 59) {
PyErr_SetString(PyExc_ValueError, "minute out of range");
return 0;
}
if (buf->tm_sec < 0 || buf->tm_sec > 61) {
PyErr_SetString(PyExc_ValueError, "seconds out of range");
return 0;
}
/* 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 0;
}
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 0;
}
return 1;
}
#define STRFTIME_FORMAT_CODES \
"Commonly used format codes:\n\
\n\
%Y Year with century as a decimal number.\n\
%m Month as a decimal number [01,12].\n\
%d Day of the month as a decimal number [01,31].\n\
%H Hour (24-hour clock) as a decimal number [00,23].\n\
%M Minute as a decimal number [00,59].\n\
%S Second as a decimal number [00,61].\n\
%z Time zone offset from UTC.\n\
%a Locale's abbreviated weekday name.\n\
%A Locale's full weekday name.\n\
%b Locale's abbreviated month name.\n\
%B Locale's full month name.\n\
%c Locale's appropriate date and time representation.\n\
%I Hour (12-hour clock) as a decimal number [01,12].\n\
%p Locale's equivalent of either AM or PM.\n\
\n\
Other codes may be available on your platform. See documentation for\n\
the C library strftime function.\n"
#ifdef HAVE_STRFTIME
// gh-154460: OpenBSD's wcsftime() computes %V incorrectly: it returns 53
// whenever the ISO 8601 week belongs to a different year than tm_year.
// strftime() is not affected.
#ifdef __OpenBSD__
# undef HAVE_WCSFTIME
#endif
#ifdef HAVE_WCSFTIME
#define time_char wchar_t
#define format_time wcsftime
#define time_strlen wcslen
#else
#define time_char char
#define format_time strftime
#define time_strlen strlen
#endif
static PyObject *
time_strftime1(time_char **outbuf, size_t *bufsize,
time_char *format, size_t fmtlen,
struct tm *tm)
{
size_t buflen;
#if defined(MS_WINDOWS) && !defined(HAVE_WCSFTIME)
/* check that the format string contains only valid directives */
for (const time_char *f = strchr(format, '%');
f != NULL;
f = strchr(f + 2, '%'))
{
if (f[1] == '#')
++f; /* not documented by python, */
if (f[1] == '\0')
break;
if ((f[1] == 'y') && tm->tm_year < 0) {
PyErr_SetString(PyExc_ValueError,
"format %y requires year >= 1900 on Windows");
return NULL;
}
}
#elif (defined(_AIX) || (defined(__sun) && defined(__SVR4))) && defined(HAVE_WCSFTIME)
for (const time_char *f = wcschr(format, '%');
f != NULL;
f = wcschr(f + 2, '%'))
{
if (f[1] == L'\0')
break;
/* Issue #19634: On AIX, wcsftime("y", (1899, 1, 1, 0, 0, 0, 0, 0, 0))
returns "0/" instead of "99" */
if (f[1] == L'y' && tm->tm_year < 0) {
PyErr_SetString(PyExc_ValueError,
"format %y requires year >= 1900 on AIX");
return NULL;
}
}
#endif
/* I hate these functions that presume you know how big the output
* will be ahead of time...
*/
while (1) {
if (*bufsize > PY_SSIZE_T_MAX/sizeof(time_char)) {
PyErr_NoMemory();
return NULL;
}
time_char *tmp = (time_char *)PyMem_Realloc(*outbuf,
*bufsize*sizeof(time_char));
if (tmp == NULL) {
PyMem_Free(*outbuf);
*outbuf = NULL;
PyErr_NoMemory();
return NULL;
}
*outbuf = tmp;
#if defined _MSC_VER && _MSC_VER >= 1400 && defined(__STDC_SECURE_LIB__)
errno = 0;
#endif
_Py_BEGIN_SUPPRESS_IPH
buflen = format_time(*outbuf, *bufsize, format, tm);
_Py_END_SUPPRESS_IPH
#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 NULL;
}
#endif
if (buflen == 0 && *bufsize < 256 * fmtlen) {
*bufsize += *bufsize;
continue;
}
/* 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. */
#ifdef HAVE_WCSFTIME
return PyUnicode_FromWideChar(*outbuf, buflen);
#else
return PyUnicode_DecodeLocaleAndSize(*outbuf, buflen, "surrogateescape");
#endif
}
}
static PyObject *
time_strftime(PyObject *module, PyObject *args)
{
PyObject *tup = NULL;
struct tm buf;
PyObject *format_arg;
Py_ssize_t format_size;
time_char *format, *outbuf = NULL;
size_t fmtlen, bufsize = 1024;
memset((void *) &buf, '\0', sizeof(buf));
if (!PyArg_ParseTuple(args, "U|O:strftime", &format_arg, &tup))
return NULL;
time_module_state *state = get_time_state(module);
if (tup == NULL) {
time_t tt = time(NULL);
if (_PyTime_localtime(tt, &buf) != 0)
return NULL;
}
else if (!gettmarg(state, tup, &buf,
"iiiiiiiii;strftime(): illegal time tuple argument") ||
!checktm(&buf))
{
return NULL;
}
// Some platforms only support a limited range of years.
//
// Android works with negative years on the emulator, but fails on some
// physical devices (#123017).
#if defined(_MSC_VER) || (defined(__sun) && defined(__SVR4)) || defined(_AIX) \
|| defined(__VXWORKS__) || defined(__ANDROID__)
if (buf.tm_year + 1900 < 1 || 9999 < buf.tm_year + 1900) {
PyErr_SetString(PyExc_ValueError,
"strftime() requires year in [1; 9999]");
return NULL;
}
#endif
/* Normalize tm_isdst just in case someone foolishly implements %Z
based on the assumption that tm_isdst falls within the range of
[-1, 1] */
if (buf.tm_isdst < -1)
buf.tm_isdst = -1;
else if (buf.tm_isdst > 1)
buf.tm_isdst = 1;
format_size = PyUnicode_GET_LENGTH(format_arg);
if ((size_t)format_size > PY_SSIZE_T_MAX/sizeof(time_char) - 1) {
PyErr_NoMemory();
return NULL;
}
format = PyMem_Malloc((format_size + 1)*sizeof(time_char));
if (format == NULL) {
PyErr_NoMemory();
return NULL;
}
PyUnicodeWriter *writer = PyUnicodeWriter_Create(0);
if (writer == NULL) {
goto error;
}
Py_ssize_t i = 0;
while (i < format_size) {
fmtlen = 0;
for (; i < format_size; i++) {
Py_UCS4 c = PyUnicode_READ_CHAR(format_arg, i);
if (!c || c > 127) {
break;
}
format[fmtlen++] = (char)c;
}
if (fmtlen) {
format[fmtlen] = 0;
PyObject *unicode = time_strftime1(&outbuf, &bufsize,
format, fmtlen, &buf);
if (unicode == NULL) {
goto error;
}
if (PyUnicodeWriter_WriteStr(writer, unicode) < 0) {
Py_DECREF(unicode);
goto error;
}
Py_DECREF(unicode);
}
Py_ssize_t start = i;
for (; i < format_size; i++) {
Py_UCS4 c = PyUnicode_READ_CHAR(format_arg, i);
if (c == '%') {
break;
}
}
if (PyUnicodeWriter_WriteSubstring(writer, format_arg, start, i) < 0) {
goto error;
}
}
PyMem_Free(outbuf);
PyMem_Free(format);
return PyUnicodeWriter_Finish(writer);
error:
PyMem_Free(outbuf);
PyMem_Free(format);
PyUnicodeWriter_Discard(writer);
return NULL;
}
#undef time_char
#undef format_time
PyDoc_STRVAR(strftime_doc,
"strftime(format[, time_tuple]) -> string\n\
\n\