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Simplify PyInit_timezone. (GH-9467) 

Reduce the knotty preprocessor conditional logic, dedent unnecessarily nested
code, and handle errors properly.

The first edition of this change (afde1c1a05)
failed (bpo-34715) because FreeBSD doesn't define the timezone globals. That's
why we're now checking for HAVE_DECL_TZNAME.
This commit is contained in:
Benjamin Peterson 2018-09-20 19:52:18 -07:00 committed by GitHub
parent a4ae828ee4
commit c510c6b8b6
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 52 additions and 50 deletions
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98
Modules/timemodule.c
View File

@ -1522,7 +1522,7 @@ PyDoc_STRVAR(get_clock_info_doc,
\n\
Get information of the specified clock.");
#if !defined(HAVE_TZNAME) || defined(__GLIBC__) || defined(__CYGWIN__)
#ifndef HAVE_DECL_TZNAME
static void
get_zone(char *zone, int n, struct tm *p)
{
@ -1543,7 +1543,7 @@ get_gmtoff(time_t t, struct tm *p)
return timegm(p) - t;
#endif
}
#endif /* !defined(HAVE_TZNAME) || defined(__GLIBC__) || defined(__CYGWIN__) */
#endif // !HAVE_DECL_TZNAME
static void
PyInit_timezone(PyObject *m) {
@ -1563,7 +1563,7 @@ PyInit_timezone(PyObject *m) {
And I'm lazy and hate C so nyer.
*/
#if defined(HAVE_TZNAME) && !defined(__GLIBC__) && !defined(__CYGWIN__)
#ifdef HAVE_DECL_TZNAME
PyObject *otz0, *otz1;
tzset();
PyModule_AddIntConstant(m, "timezone", timezone);
@ -1574,54 +1574,52 @@ PyInit_timezone(PyObject *m) {
#endif
PyModule_AddIntConstant(m, "daylight", daylight);
otz0 = PyUnicode_DecodeLocale(tzname[0], "surrogateescape");
otz1 = PyUnicode_DecodeLocale(tzname[1], "surrogateescape");
PyModule_AddObject(m, "tzname", Py_BuildValue("(NN)", otz0, otz1));
#else /* !HAVE_TZNAME || __GLIBC__ || __CYGWIN__*/
{
#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;
_PyTime_localtime(t, &p);
get_zone(janname, 9, &p);
janzone = -get_gmtoff(t, &p);
janname[9] = '\0';
t += YEAR/2;
_PyTime_localtime(t, &p);
get_zone(julyname, 9, &p);
julyzone = -get_gmtoff(t, &p);
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));
}
if (otz0 == NULL) {
return;
}
#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__*/
otz1 = PyUnicode_DecodeLocale(tzname[1], "surrogateescape");
if (otz1 == NULL) {
Py_DECREF(otz0);
return;
}
PyObject *tzname_obj = Py_BuildValue("(NN)", otz0, otz1);
if (tzname_obj == NULL)
return;
PyModule_AddObject(m, "tzname", tzname_obj);
#else // !HAVE_DECL_TZNAME
static const time_t YEAR = (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;
_PyTime_localtime(t, &p);
get_zone(janname, 9, &p);
janzone = -get_gmtoff(t, &p);
janname[9] = '\0';
t += YEAR/2;
_PyTime_localtime(t, &p);
get_zone(julyname, 9, &p);
julyzone = -get_gmtoff(t, &p);
julyname[9] = '\0';
PyObject *tzname_obj;
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);
tzname_obj = Py_BuildValue("(zz)", julyname, janname);
} else {
PyModule_AddIntConstant(m, "timezone", janzone);
PyModule_AddIntConstant(m, "altzone", julyzone);
PyModule_AddIntConstant(m, "daylight", janzone != julyzone);
tzname_obj = Py_BuildValue("(zz)", janname, julyname);
}
if (tzname_obj == NULL)
return;
PyModule_AddObject(m, "tzname", tzname_obj);
#endif // !HAVE_DECL_TZNAME
}

4
PC/pyconfig.h
View File

@ -396,6 +396,10 @@ Py_NO_ENABLE_SHARED to find out. Also support MS_NO_COREDLL for b/w compat */
/* Define to 1 if you have the <direct.h> header file. */
#define HAVE_DIRECT_H 1
/* Define to 1 if you have the declaration of `tzname', and to 0 if you don't.
*/
#define HAVE_DECL_TZNAME 1
/* Define if you have dirent.h. */
/* #define DIRENT 1 */