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Issue #28148: Stop using localtime() and gmtime() in the time module.

Browse source 
Introduced platform independent _PyTime_localtime API that is similar
to POSIX localtime_r, but available on all platforms.  Patch by Ed
Schouten.
This commit is contained in:
Alexander Belopolsky 2016-09-28 17:31:35 -04:00
parent e5ccf3d699
commit 3e7a3cb903
5 changed files with 91 additions and 92 deletions
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8
Include/pytime.h
View file

@ -184,6 +184,14 @@ PyAPI_FUNC(int) _PyTime_GetMonotonicClockWithInfo(
Return 0 on success, raise an exception and return -1 on error. */
PyAPI_FUNC(int) _PyTime_Init(void);
/* Converts a timestamp to the Gregorian time, using the local time zone.
Return 0 on success, raise an exception and return -1 on error. */
PyAPI_FUNC(int) _PyTime_localtime(time_t t, struct tm *tm);
/* Converts a timestamp to the Gregorian time, assuming UTC.
Return 0 on success, raise an exception and return -1 on error. */
PyAPI_FUNC(int) _PyTime_gmtime(time_t t, struct tm *tm);
#ifdef __cplusplus
}
#endif

1
Misc/ACKS
View file

@ -1340,6 +1340,7 @@ Michael Schneider
Peter Schneider-Kamp
Arvin Schnell
Nofar Schnider
Ed Schouten
Scott Schram
Robin Schreiber
Chad J. Schroeder

67
Modules/_datetimemodule.c
View file

@ -9,18 +9,6 @@
#ifdef MS_WINDOWS
# include <winsock2.h> /* struct timeval */
static struct tm *localtime_r(const time_t *timep, struct tm *result)
{
if (localtime_s(result, timep) == 0)
return result;
return NULL;
}
static struct tm *gmtime_r(const time_t *timep, struct tm *result)
{
if (gmtime_s(result, timep) == 0)
return result;
return NULL;
}
#endif
/* Differentiate between building the core module and building extension
@ -2529,15 +2517,8 @@ date_local_from_object(PyObject *cls, PyObject *obj)
if (_PyTime_ObjectToTime_t(obj, &t, _PyTime_ROUND_FLOOR) == -1)
return NULL;
if (localtime_r(&t, &tm) == NULL) {
/* unconvertible time */
#ifdef EINVAL
if (errno == 0)
errno = EINVAL;
#endif
PyErr_SetFromErrno(PyExc_OSError);
if (_PyTime_localtime(t, &tm) != 0)
return NULL;
}
return PyObject_CallFunction(cls, "iii",
tm.tm_year + 1900,
@ -4199,8 +4180,9 @@ datetime_new(PyTypeObject *type, PyObject *args, PyObject *kw)
return self;
}
/* TM_FUNC is the shared type of localtime_r() and gmtime_r(). */
typedef struct tm *(*TM_FUNC)(const time_t *timer, struct tm*);
/* TM_FUNC is the shared type of _PyTime_localtime() and
* _PyTime_gmtime(). */
typedef int (*TM_FUNC)(time_t timer, struct tm*);
/* As of version 2015f max fold in IANA database is
* 23 hours at 1969-09-30 13:00:00 in Kwajalein. */
@ -4229,10 +4211,8 @@ local(long long u)
return -1;
}
/* XXX: add bounds checking */
if (localtime_r(&t, &local_time) == NULL) {
PyErr_SetFromErrno(PyExc_OSError);
if (_PyTime_localtime(t, &local_time) != 0)
return -1;
}
return utc_to_seconds(local_time.tm_year + 1900,
local_time.tm_mon + 1,
local_time.tm_mday,
@ -4252,13 +4232,8 @@ datetime_from_timet_and_us(PyObject *cls, TM_FUNC f, time_t timet, int us,
struct tm tm;
int year, month, day, hour, minute, second, fold = 0;
if (f(&timet, &tm) == NULL) {
#ifdef EINVAL
if (errno == 0)
errno = EINVAL;
#endif
return PyErr_SetFromErrno(PyExc_OSError);
}
if (f(timet, &tm) != 0)
return NULL;
year = tm.tm_year + 1900;
month = tm.tm_mon + 1;
@ -4273,7 +4248,7 @@ datetime_from_timet_and_us(PyObject *cls, TM_FUNC f, time_t timet, int us,
*/
second = Py_MIN(59, tm.tm_sec);
if (tzinfo == Py_None && f == localtime_r) {
if (tzinfo == Py_None && f == _PyTime_localtime) {
long long probe_seconds, result_seconds, transition;
result_seconds = utc_to_seconds(year, month, day,
@ -4361,7 +4336,8 @@ datetime_datetime_now_impl(PyTypeObject *type, PyObject *tz)
return NULL;
self = datetime_best_possible((PyObject *)type,
tz == Py_None ? localtime_r : gmtime_r,
tz == Py_None ? _PyTime_localtime :
_PyTime_gmtime,
tz);
if (self != NULL && tz != Py_None) {
/* Convert UTC to tzinfo's zone. */
@ -4376,7 +4352,7 @@ datetime_datetime_now_impl(PyTypeObject *type, PyObject *tz)
static PyObject *
datetime_utcnow(PyObject *cls, PyObject *dummy)
{
return datetime_best_possible(cls, gmtime_r, Py_None);
return datetime_best_possible(cls, _PyTime_gmtime, Py_None);
}
/* Return new local datetime from timestamp (Python timestamp -- a double). */
@ -4395,7 +4371,8 @@ datetime_fromtimestamp(PyObject *cls, PyObject *args, PyObject *kw)
return NULL;
self = datetime_from_timestamp(cls,
tzinfo == Py_None ? localtime_r : gmtime_r,
tzinfo == Py_None ? _PyTime_localtime :
_PyTime_gmtime,
timestamp,
tzinfo);
if (self != NULL && tzinfo != Py_None) {
@ -4413,7 +4390,7 @@ datetime_utcfromtimestamp(PyObject *cls, PyObject *args)
PyObject *result = NULL;
if (PyArg_ParseTuple(args, "O:utcfromtimestamp", &timestamp))
result = datetime_from_timestamp(cls, gmtime_r, timestamp,
result = datetime_from_timestamp(cls, _PyTime_gmtime, timestamp,
Py_None);
return result;
}
@ -5040,14 +5017,8 @@ local_timezone_from_timestamp(time_t timestamp)
PyObject *nameo = NULL;
const char *zone = NULL;
if (localtime_r(&timestamp, &local_time_tm) == NULL) {
#ifdef EINVAL
if (errno == 0)
errno = EINVAL;
#endif
PyErr_SetFromErrno(PyExc_OSError);
if (_PyTime_localtime(timestamp, &local_time_tm) != 0)
return NULL;
}
#ifdef HAVE_STRUCT_TM_TM_ZONE
zone = local_time_tm.tm_zone;
delta = new_delta(0, local_time_tm.tm_gmtoff, 0, 1);
@ -5067,14 +5038,8 @@ local_timezone_from_timestamp(time_t timestamp)
if (local_time == NULL) {
return NULL;
}
if (gmtime_r(&timestamp, &utc_time_tm) == NULL) {
#ifdef EINVAL
if (errno == 0)
errno = EINVAL;
#endif
PyErr_SetFromErrno(PyExc_OSError);
if (_PyTime_gmtime(timestamp, &utc_time_tm) != 0)
return NULL;
}
utc_time = new_datetime(utc_time_tm.tm_year + 1900,
utc_time_tm.tm_mon + 1,
utc_time_tm.tm_mday,

55
Modules/timemodule.c
View file

@ -343,21 +343,14 @@ static PyObject *
time_gmtime(PyObject *self, PyObject *args)
{
time_t when;
struct tm buf, *local;
struct tm buf;
if (!parse_time_t_args(args, "|O:gmtime", &when))
return NULL;
errno = 0;
local = gmtime(&when);
if (local == NULL) {
#ifdef EINVAL
if (errno == 0)
errno = EINVAL;
#endif
return PyErr_SetFromErrno(PyExc_OSError);
}
buf = *local;
if (_PyTime_gmtime(when, &buf) != 0)
return NULL;
#ifdef HAVE_STRUCT_TM_TM_ZONE
return tmtotuple(&buf);
#else
@ -388,26 +381,6 @@ GMT). When 'seconds' is not passed in, convert the current time instead.\n\
If the platform supports the tm_gmtoff and tm_zone, they are available as\n\
attributes only.");
static int
pylocaltime(time_t *timep, struct tm *result)
{
struct tm *local;
assert (timep != NULL);
local = localtime(timep);
if (local == NULL) {
/* unconvertible time */
#ifdef EINVAL
if (errno == 0)
errno = EINVAL;
#endif
PyErr_SetFromErrno(PyExc_OSError);
return -1;
}
*result = *local;
return 0;
}
static PyObject *
time_localtime(PyObject *self, PyObject *args)
{
@ -416,7 +389,7 @@ time_localtime(PyObject *self, PyObject *args)
if (!parse_time_t_args(args, "|O:localtime", &when))
return NULL;
if (pylocaltime(&when, &buf) == -1)
if (_PyTime_localtime(when, &buf) != 0)
return NULL;
#ifdef HAVE_STRUCT_TM_TM_ZONE
return tmtotuple(&buf);
@ -611,7 +584,7 @@ time_strftime(PyObject *self, PyObject *args)
if (tup == NULL) {
time_t tt = time(NULL);
if (pylocaltime(&tt, &buf) == -1)
if (_PyTime_localtime(tt, &buf) != 0)
return NULL;
}
else if (!gettmarg(tup, &buf) || !checktm(&buf))
@ -796,7 +769,7 @@ time_asctime(PyObject *self, PyObject *args)
return NULL;
if (tup == NULL) {
time_t tt = time(NULL);
if (pylocaltime(&tt, &buf) == -1)
if (_PyTime_localtime(tt, &buf) != 0)
return NULL;
} else if (!gettmarg(tup, &buf) || !checktm(&buf))
@ -818,7 +791,7 @@ time_ctime(PyObject *self, PyObject *args)
struct tm buf;
if (!parse_time_t_args(args, "|O:ctime", &tt))
return NULL;
if (pylocaltime(&tt, &buf) == -1)
if (_PyTime_localtime(tt, &buf) != 0)
return NULL;
return _asctime(&buf);
}
@ -1239,18 +1212,18 @@ PyInit_timezone(PyObject *m) {
{
#define YEAR ((time_t)((365 * 24 + 6) * 3600))
time_t t;
struct tm *p;
struct tm p;
long janzone, julyzone;
char janname[10], julyname[10];
t = (time((time_t *)0) / YEAR) * YEAR;
p = localtime(&t);
get_zone(janname, 9, p);
janzone = -get_gmtoff(t, p);
_PyTime_localtime(t, &p);
get_zone(janname, 9, &p);
janzone = -get_gmtoff(t, &p);
janname[9] = '\0';
t += YEAR/2;
p = localtime(&t);
get_zone(julyname, 9, p);
julyzone = -get_gmtoff(t, p);
_PyTime_localtime(t, &p);
get_zone(julyname, 9, &p);
julyzone = -get_gmtoff(t, &p);
julyname[9] = '\0';
if( janzone < julyzone ) {

52
Python/pytime.c
View file

@ -766,3 +766,55 @@ _PyTime_Init(void)
return 0;
}
int
_PyTime_localtime(time_t t, struct tm *tm)
{
#ifdef MS_WINDOWS
int error;
error = localtime_s(tm, &t);
if (error != 0) {
errno = error;
PyErr_SetFromErrno(PyExc_OSError);
return -1;
}
return 0;
#else /* !MS_WINDOWS */
if (localtime_r(&t, tm) == NULL) {
#ifdef EINVAL
if (errno == 0)
errno = EINVAL;
#endif
PyErr_SetFromErrno(PyExc_OSError);
return -1;
}
return 0;
#endif /* MS_WINDOWS */
}
int
_PyTime_gmtime(time_t t, struct tm *tm)
{
#ifdef MS_WINDOWS
int error;
error = gmtime_s(tm, &t);
if (error != 0) {
errno = error;
PyErr_SetFromErrno(PyExc_OSError);
return -1;
}
return 0;
#else /* !MS_WINDOWS */
if (gmtime_r(&t, tm) == NULL) {
#ifdef EINVAL
if (errno == 0)
errno = EINVAL;
#endif
PyErr_SetFromErrno(PyExc_OSError);
return -1;
}
return 0;
#endif /* MS_WINDOWS */
}