[Octave-bug-tracker] [bug #65219] datenum/datestr/datevec: Inconsistent behavior for '' input

[anonymous]

Follow-up Comment #1, bug#65219 (group octave):

I did raise the ticket. To improve resolution, here is what I found:

The regression was introduced with 8.4.0 and the new possible format 'yyyy',
the function __date_str2vec__ calls [tm, nc] = strptime (ds, f);

For 'yyyy' the function __date_vfmt2sfmt__ returned f = '%Y'.

Now [tm, nc] = strptime ('', '%Y') returns empty struct for tm, but nc = 1.

Since nc = 1 and columns('') = 0, the following default values are applied:
if (nc == columns (ds) + 1)
    found = true
    y = tm.year + 1900
    m = tm.mon + 1
    d = tm.mday

Therefore we get back the inconsistent datevec [1900 1 0 0 0 0].

In my personal view the weird behavior is in function strptime, since it
returns "number of chars" = 1 for an empty string as a result for fmt
matching.

So either correct it there of catch the empty string right in the datevec
function at the earliest possible state.

Best,
Stefan




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