Avoid buffer overflow on invalid DateTime #186
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The timestamp() method would overflow its internal buffer if any of the data fields of the provided DateTime (save for yOff) was larger than 99. Even though any such DateTime would be invalid, it should not corrupt the memory.
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The
timestamp()method overflows its internal buffer if any of the data fields of the providedDateTime(save foryOff) is larger than 99. SuchDateTimeobjects are all invalid. This pull request makes the method safe for anyDateTime, whether it is valid or not.Although it is understood that nothing meaningful should be expected out of invalid data, corrupting memory should always be avoided. The rationale is that it is fine for operations on invalid data to yield unspecified (i.e. meaningless) results, but undefined behavior (i.e. anything can happen, including a crash) should always be avoided.
Incidentally, the patched
timestamp()method happens to return a meaningful representation, even for invalidDateTimeobjects: it exposes the contents of the object members. This turned out to be useful for testing the proposedfixDateTime()method, from pull request #185.