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Date: Fri, 14 Apr 2023 22:20:14 +0200
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: Brian Inglis via Cygwin <cygwin@cygwin.com>
Cc: Brian Inglis <Brian.Inglis@shaw.ca>,
	Gionatan Danti <g.danti@assyoma.it>
Subject: Re: Can not stat file with utf char U+F020
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Mail-Followup-To: Brian Inglis via Cygwin <cygwin@cygwin.com>,
	Brian Inglis <Brian.Inglis@shaw.ca>,
	Gionatan Danti <g.danti@assyoma.it>
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On Apr 14 13:54, Brian Inglis via Cygwin wrote:
> On 2023-04-14 13:00, Corinna Vinschen via Cygwin wrote:
> > On Apr 14 19:53, Gionatan Danti via Cygwin wrote:
> > > [1] https://sourceware.org/legacy-ml/cygwin/2009-11/msg00043.html
> 
> > While this patch would have fixed your problem, a later followup patch
> > broke your usage of U+F020 (space replacement) and, FWIW, of U+F02E
> > (dot replacement) again:
> > 	https://cygwin.com/cgit/newlib-cygwin/commit/?id=8802178fddfd
> > This was done to accomodate filesystems implementing the idiotic
> > approach to support only DOS filenames, i.e. not allowing leading or
> > trailing spaces and not allowing trailing dots. These are Netapp and
> > Novell Netware filesystems. See the last paragraph of
> > https://cygwin.com/cygwin-ug-net/using-specialnames.html#pathnames-specialchars
> > Any chance you can just rename the files?
> 
> 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.
> 
> For Cygwin purposes:
> 
> F000−F7FF	unassigned	Reserved for hacks and corporate use
> 
> so Cygwin's special Windows file name characters mappings are clear:
> 
For completeness sake, starting with commit 8802178fddfd:

        F020    <space>
> 	F022	"
> 	F02A	*
        F02E    .
> 	F03A	:
> 	F03C	<
> 	F03E	>
> 	F03F	?
> 	F07C	|


Corinna