From caebe22038d4de526ab34cfda98047f01c53fc9d Mon Sep 17 00:00:00 2001 From: Brett Cannon Date: Tue, 18 Jul 2006 04:41:36 +0000 Subject: Fix bug #1520914. Starting in 2.4, time.strftime() began to check the bounds of values in the time tuple passed in. Unfortunately people came to rely on undocumented behaviour of setting unneeded values to 0, regardless of if it was within the valid range. Now those values force the value internally to the minimum value when 0 is passed in. --- Doc/lib/libtime.tex | 2 ++ Lib/test/test_time.py | 32 ++++++++++++++++++++------------ Misc/NEWS | 6 ++++++ Modules/timemodule.c | 32 ++++++++++++++++++++++++++++---- 4 files changed, 56 insertions(+), 16 deletions(-) diff --git a/Doc/lib/libtime.tex b/Doc/lib/libtime.tex index b39b650..0e83400 100644 --- a/Doc/lib/libtime.tex +++ b/Doc/lib/libtime.tex @@ -226,6 +226,8 @@ if any field in \var{t} is outside of the allowed range. \versionchanged[Allowed \var{t} to be omitted]{2.1} \versionchanged[\exception{ValueError} raised if a field in \var{t} is out of range]{2.4} +\versionchanged[0 is now a legal argument for any position in the time tuple; +if it is normally illegal the value is forced to a correct one.]{2.5} The following directives can be embedded in the \var{format} string. diff --git a/Lib/test/test_time.py b/Lib/test/test_time.py index 94bbcca..f4be759 100644 --- a/Lib/test/test_time.py +++ b/Lib/test/test_time.py @@ -39,9 +39,9 @@ class TimeTestCase(unittest.TestCase): def test_strftime_bounds_checking(self): # Make sure that strftime() checks the bounds of the various parts - #of the time tuple. + #of the time tuple (0 is valid for *all* values). - # Check year + # Check year [1900, max(int)] self.assertRaises(ValueError, time.strftime, '', (1899, 1, 1, 0, 0, 0, 0, 1, -1)) if time.accept2dyear: @@ -49,27 +49,27 @@ class TimeTestCase(unittest.TestCase): (-1, 1, 1, 0, 0, 0, 0, 1, -1)) self.assertRaises(ValueError, time.strftime, '', (100, 1, 1, 0, 0, 0, 0, 1, -1)) - # Check month + # Check month [1, 12] + zero support self.assertRaises(ValueError, time.strftime, '', - (1900, 0, 1, 0, 0, 0, 0, 1, -1)) + (1900, -1, 1, 0, 0, 0, 0, 1, -1)) self.assertRaises(ValueError, time.strftime, '', (1900, 13, 1, 0, 0, 0, 0, 1, -1)) - # Check day of month + # Check day of month [1, 31] + zero support self.assertRaises(ValueError, time.strftime, '', - (1900, 1, 0, 0, 0, 0, 0, 1, -1)) + (1900, 1, -1, 0, 0, 0, 0, 1, -1)) self.assertRaises(ValueError, time.strftime, '', (1900, 1, 32, 0, 0, 0, 0, 1, -1)) - # Check hour + # Check hour [0, 23] self.assertRaises(ValueError, time.strftime, '', (1900, 1, 1, -1, 0, 0, 0, 1, -1)) self.assertRaises(ValueError, time.strftime, '', (1900, 1, 1, 24, 0, 0, 0, 1, -1)) - # Check minute + # Check minute [0, 59] self.assertRaises(ValueError, time.strftime, '', (1900, 1, 1, 0, -1, 0, 0, 1, -1)) self.assertRaises(ValueError, time.strftime, '', (1900, 1, 1, 0, 60, 0, 0, 1, -1)) - # Check second + # Check second [0, 61] self.assertRaises(ValueError, time.strftime, '', (1900, 1, 1, 0, 0, -1, 0, 1, -1)) # C99 only requires allowing for one leap second, but Python's docs say @@ -82,17 +82,25 @@ class TimeTestCase(unittest.TestCase): # modulo. self.assertRaises(ValueError, time.strftime, '', (1900, 1, 1, 0, 0, 0, -2, 1, -1)) - # Check day of the year + # Check day of the year [1, 366] + zero support self.assertRaises(ValueError, time.strftime, '', - (1900, 1, 1, 0, 0, 0, 0, 0, -1)) + (1900, 1, 1, 0, 0, 0, 0, -1, -1)) self.assertRaises(ValueError, time.strftime, '', (1900, 1, 1, 0, 0, 0, 0, 367, -1)) - # Check daylight savings flag + # Check daylight savings flag [-1, 1] self.assertRaises(ValueError, time.strftime, '', (1900, 1, 1, 0, 0, 0, 0, 1, -2)) self.assertRaises(ValueError, time.strftime, '', (1900, 1, 1, 0, 0, 0, 0, 1, 2)) + def test_default_values_for_zero(self): + # Make sure that using all zeros uses the proper default values. + # No test for daylight savings since strftime() does not change output + # based on its value. + expected = "2000 01 01 00 00 00 1 001" + result = time.strftime("%Y %m %d %H %M %S %w %j", (0,)*9) + self.assertEquals(expected, result) + def test_strptime(self): tt = time.gmtime(self.t) for directive in ('a', 'A', 'b', 'B', 'c', 'd', 'H', 'I', diff --git a/Misc/NEWS b/Misc/NEWS index 4c761e0..53f3dc8 100644 --- a/Misc/NEWS +++ b/Misc/NEWS @@ -27,6 +27,12 @@ Core and builtins Library ------- +- Bug #1520914: Change time.strftime() to accept a zero for any position in its + argument tuple. For arguments where zero is illegal, the value is forced to + the minimum value that is correct. This is to support an undocumented but + common way people used to fill in inconsequential information in the time + tuple pre-2.4. + - Patch #1220874: Update the binhex module for Mach-O. Extension Modules diff --git a/Modules/timemodule.c b/Modules/timemodule.c index 402e349..eb279fc9 100644 --- a/Modules/timemodule.c +++ b/Modules/timemodule.c @@ -406,13 +406,35 @@ time_strftime(PyObject *self, PyObject *args) indexing blindly into some array for a textual representation by some bad index (fixes bug #897625). - No check for year since handled in gettmarg(). + 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 #XXX). + + 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 < 0 || buf.tm_mon > 11) { + 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 < 1 || buf.tm_mday > 31) { + 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; } @@ -434,7 +456,9 @@ time_strftime(PyObject *self, PyObject *args) PyErr_SetString(PyExc_ValueError, "day of week out of range"); return NULL; } - if (buf.tm_yday < 0 || buf.tm_yday > 365) { + 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; } -- cgit v0.12