Re: Fix fseek() detection of unseekable files on WIN32

On Thu, Mar 16, 2023 at 10:08:44AM +0100, Juan José Santamaría Flecha wrote:
> IDK, this is just looking for the good case, anything else we'll fail with
> ESPIPE or EINVAL anyway. If we want to get the proper file type we can call
> fstat(), which has the full logic.

I am not sure, TBH.  As presented, the two GetFileType() calls in
_pgftello64() and _pgfseeko64() ignore the case where it returns
FILE_TYPE_UNKNOWN and GetLastError() has something else than
NO_ERROR.  The code would return EINVAL for all the errors happening.
Perhaps that's fine, though I am wondering if we should report
something more exact, based on _dosmaperr(GetLastError())?
--
Michael