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Subject: Re: cygpath -w 'a"b'
From: Warren Young <wyml@etr-usa.com>
In-Reply-To: <000b01d1dddd$174e66a0$45eb33e0$@gmail.com>
Date: Thu, 14 Jul 2016 09:24:13 -0600
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References: <000b01d1dddd$174e66a0$45eb33e0$@gmail.com>
To: The Cygwin Mailing List <cygwin@cygwin.com>
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On Jul 14, 2016, at 8:36 AM, Brien Oberstein <brienpub@gmail.com> wrote:
> 
> cygpath -w 'a"b' doesn't seem to translate the double quotes into a windows
> accesible file name.

Double quotes are illegal on NTFS:

  https://msdn.microsoft.com/library/windows/desktop/aa365247.aspx

> what is the proper way to translate from cygwin
> filenames with special mapped characters (eg " and : )?

If you look at such a file name in Explorer, Cygwin (?) seems to be mapping double-quotes to U+F022, which is currently not defined within Unicode:

  http://www.fileformat.info/info/unicode/char/f022/

That’s fine as far as Cygwin goes, but it still isn’t going to make native Windows programs believe that double-quotes are legal in file names.

While playing with all of this, I stumbled across an actual cygpath bug:

  $ mkdir 'the "foo" directory’
  $ cygpath -w 'the "foo" directory/' | od -c
  0000000   t   h   e       "   f   o   o 357 200 242       d   i   r   e
  0000020   c   t   o   r   y   \  \n
  0000027

That is, it translates the second double-quote only.

Attempting something more like what Brien talks about also fails:

  $ mkdir 'a"b'
  $ explorer 'a"b'                        # opens my Documents folder!
  $ explorer "$(cygpath -w 'a"b')"        # ditto
  $ explorer $(echo -e "a\xEF\x80\xA2b")  # opens expected folder

Strange stuff.
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