Bug 975996: Add _PyTime_DoubleToTimet to C API

New include file timefuncs.h exports private API function
_PyTime_DoubleToTimet() from timemodule.c.  timemodule should export
some other functions too (look for painful bits in datetimemodule.c).

Added insane-argument checking to datetime's assorted fromtimestamp()
and utcfromtimestamp() methods.  Added insane-argument tests of these
to test_datetime, and insane-argument tests for ctime(), localtime()
and gmtime() to test_time.

1 files changed, 12 insertions, 3 deletions

diff --git a/Misc/NEWS b/Misc/NEWS
index b3096ca..f2b65e6 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -228,9 +228,13 @@ Core and builtins
 Extension modules
 -----------------
 
-- time module code that deals with time_t timestamps will now raise a
-  ValueError if more than a second is lost in precision from time_t being less
-  precise than a double.  Closes bug #919012.
+- time module code that deals with input POSIX timestamps will now raise
+  ValueError if more than a second is lost in precision when the
+  timestamp is cast to the platform C time_t type.  There's no chance
+  that the platform will do anything sensible with the result in such
+  cases.  This includes ctime(), localtime() and gmtime().  Assorted
+  fromtimestamp() and utcfromtimestamp() methods in the datetime module
+  were also protected.  Closes bugs #919012 and 975996.
 
 - fcntl.ioctl now warns if the mutate flag is not specified.
 
@@ -555,6 +559,11 @@ Build
 C API
 -----
 
+- Private function _PyTime_DoubleToTimet added, to convert a Python
+  timestamp (C double) to platform time_t with some out-of-bounds
+  checking.  Declared in new header file timefuncs.h.  It would be
+  good to expose some other internal timemodule.c functions there.
+
 - New public functions PyEval_EvaluateFrame and PyGen_New to expose
   generator objects.