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Date: Fri, 14 Apr 2023 22:25:53 +0200
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Can not stat file with utf char U+F020
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On Apr 14 22:21, Gionatan Danti via Cygwin wrote:
> Il 2023-04-14 21:54 Brian Inglis ha scritto:
> > UCSUR Under-ConScript Unicode Registry and its predecessor ConScript
> > Unicode Registry CSUR
> > 
> > 	https://www.kreativekorp.com/ucsur/
> > 
> > 	http://www.evertype.com/standards/csur/
> > 
> > unofficially register Unicode PUA glyphs for academic, artificial,
> > constructed, historical, invented, and minority language scripts, some
> > of which have made it into Unicode e.g.
> > 
> > 	Script		CSUR		Unicode
> > 	PHAISTOS DISC	U+E6D0-U+E6FF	U+101D0-U+101DF
> > 	SHAVIAN		U+E700-U+E72F	U+10450-U+1047F
> > 	DESERET		U+E830-U+E88F	U+10400-U+1044F
> > 
> > and maintain their own Unidata e.g.
> > 
> > 	https://www.kreativekorp.com/ucsur/UNIDATA/Blocks.txt
> > 
> > and some Unicode fonts have -CSUR addition files (like -Italic etc.)
> > that support BMP and SMP PUA glyphs.
> 
> So they are actively using PUA? I did not know that, thanks.
> 
> > For Cygwin purposes:
> > 
> > F000−F7FF	unassigned	Reserved for hacks and corporate use
> > 
> > so Cygwin's special Windows file name characters mappings are clear:
> > 
> > 	F022	"
> > 	F02A	*
> > 	F03A	:
> > 	F03C	<
> > 	F03E	>
> > 	F03F	?
> > 	F07C	|
> 
> Would it be possible to "bypass" the chars in the range F000−F7FF that are
> not used/reserved by cygwin?

We do that.  You're just stumbling over tha fact that U+F020 is also
used as outlined in 
https://cygwin.com/cygwin-ug-net/using-specialnames.html#pathnames-specialchars
and https://cygwin.com/pipermail/cygwin/2023-April/253478.html


Corinna