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bpo-36779: time.tzname returns empty string on Windows if default cod… (GH-13073) (GH-14032)

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Calling setlocale(LC_CTYPE, "") on a system where GetACP() returns CP_UTF8 results in empty strings in _tzname[].

This causes time.tzname to be an empty string.
I have reported the bug to the UCRT team and will follow up, but it will take some time get a fix into production.

In the meantime one possible workaround is to temporarily change the locale by calling setlocale(LC_CTYPE, "C") before calling _tzset and restore the current locale after if the GetACP() == CP_UTF8 or CP_UTF7

@zooba

https://bugs.python.org/issue36779
(cherry picked from commit b4c7defe58)

Co-authored-by: Paul Monson <paulmon@users.noreply.github.com>
This commit is contained in:
Miss Islington (bot) 2019-06-13 06:22:51 -07:00 • committed by Victor Stinner
parent cbda40db7b
commit 0a9baec16c
2 changed files with 16 additions and 0 deletions
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2
Misc/NEWS.d/next/Windows/2019-06-11-15-41-34.bpo-36779.0TMw6f.rst Normal file
View file

@ -0,0 +1,2 @@
Ensure ``time.tzname`` is correct on Windows when the active code page is
set to CP_UTF7 or CP_UTF8.

14
Modules/timemodule.c
View file

@ -1581,6 +1581,19 @@ init_timezone(PyObject *m)
PyModule_AddIntConstant(m, "altzone", _Py_timezone-3600);
#endif
PyModule_AddIntConstant(m, "daylight", _Py_daylight);
#ifdef MS_WINDOWS
TIME_ZONE_INFORMATION tzinfo = {0};
GetTimeZoneInformation(&tzinfo);
otz0 = PyUnicode_FromWideChar(tzinfo.StandardName, -1);
if (otz0 == NULL) {
return -1;
}
otz1 = PyUnicode_FromWideChar(tzinfo.DaylightName, -1);
if (otz1 == NULL) {
Py_DECREF(otz0);
return -1;
}
#else
otz0 = PyUnicode_DecodeLocale(_Py_tzname[0], "surrogateescape");
if (otz0 == NULL) {
return -1;
@ -1590,6 +1603,7 @@ init_timezone(PyObject *m)
Py_DECREF(otz0);
return -1;
}
#endif // MS_WINDOWS
PyObject *tzname_obj = Py_BuildValue("(NN)", otz0, otz1);
if (tzname_obj == NULL) {
return -1;