bug#13553: 24.3.50; incorrect usage of IS_DIRECTORY_SEP

[Stefan Monnier]

>> > You call file-attributes, which encodes the file name and passes it to
>> > 'lstat'.  The implementation of 'lstat' in w32.c then looks at the
>> > last byte of the encoded file name to see if there's a slash or
>> > backslash there.  Boom!
>> I see.   So, does that meant that w32.c can't faithfully implement lstat
>> without doing the moral equivalent of re-decoding its argument?
> It can, if we limit such support to Windows codepage encodings.  See
> the changes I made on the emacs-24 branch revisions 111194 and 111200.

CharNextExA and CharPrevExA, in my mind, do perform the moral equivalent
of decoding the argument (just in an incremental way).

> Personally, I think supporting all possible Windows codepages is
> good enough.

Fine by me,


        Stefan