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    SubjectRe: [PATCH] console UTF-8 fixes
    On Thu, Apr 12, 2007 at 04:38:54PM +0200, Roman Zippel wrote:

    > Considering this possible volatility I'm not certain we really need this
    > in the kernel.
    > The other point is that I have problems imagining, that this should be
    > enough to edit random text files with a random editor without problems.

    No, this would not be enough for all special corner cases. It would just be
    better than currently it is. That's my goal.

    > OTOH if the editor has to all this parsing anyway, the whole thing could
    > be pushed to userspace and the Linux terminal could be marked as handling
    > all characters equally (a good hint would be if the terminal doesn't even
    > support wide characters). The terminfo database exists for a good reason

    Currently not even applications and terminal emulators agree on the width. I
    don't think terminfo has anything to do with it. Width information should
    come from glibc, but unfortunately its database is quite old, so
    applications tend to implement their own version. (Example: according to
    glibc 2.5, U+0221 is not printable. Still it's present in many fonts, and at
    least vim and joe display them.)

    So, there are several (maybe a few hundred or few thousands) characters that
    are handled differently by different applications/libraries. On the other
    hand, there are approximately 42.000 characters in BMP that are double-width
    according to every width specification or implementation I've seen so far.
    That's roughly the 2/3 of all the code points in BMP. Why is a problem if
    the kernel knows to jump 2 character cells on them?

    I'm not seeking for a perfect solution. (Taking a look at the current state
    of specs/libs/apps perfect solution doesn't even exist.) I'm seeking for
    something that is just way better than the current situation.


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    Egmont
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