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2618Re: Failed to drag&drop-open a file with wide-chars in its filename

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  • John (Eljay) Love-Jensen
    Jun 23, 2009
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      Hi Björn,

      > As far as I can tell (from searching around) HFS+ always uses
      > normalization form D (NFD) for filenames.

      HFS+ uses a variant of NFD for filenames. (The HFS+ variant predates
      standardizatoin of NFD.) This requirement is enforced by the OS.


      Windows uses NFC for filenames. I'm not sure if the Linux world settled on
      NFC or NFK.

      Amiga OS (at least the one I used) is ECMA 94 Latin 1 based (precursor to
      ISO 8859-1).

      > So as a workaround for the issue the OP had I now normalize filenames
      > to compatibility form C (NFKC) before passing the filename on to Vim
      > and this takes care of the OP's problem.

      NFC or NFKC? Those are different normalizations.

      Windows NTFS file system uses NFC. But it isn't enforced by the OS, yet.

      > However, as I see it this really is a legitimate issue in Vim itself
      > in that it does not handle NFD properly (the example above should
      > always render as one glyph, not three as it does now if NFD is used).
      > Either Vim should ensure that all buffers are normalized to composed
      > form NFC/NFKC or it needs to be made "NFD aware".

      I agree with your assessment.

      > Does anybody on the vim_multibyte list (this mail goes to vim_mac as
      > well) have any comments on this?

      The relevant Mac OS X routine APIs are:

      CFURLRef url =

      char bufferUTF8[32768*4]; // Worst case scenario.
      // As per Apple documentation, paths can be "up to 30,000 UTF-16
      // encoding units long", with each component being up to 255 UTF-16
      // encoding units long. Too bad there isn't an API to specify the
      // exact buffer size /a priori/.

      Boolean success =
      sizeof bufferUTF8);


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