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Message-ID:	<3D3C9810.9080401@cox.net>
Date:	Mon, 22 Jul 2002 19:41:04 -0400
From:	"David A. Cobb" <superbiskit AT cox DOT net>
Reply-To:	Cygwin Discussion <cygwin AT cygwin DOT com>
Organization:	CoxNet User
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To:	egor duda <cygwin AT cygwin DOT com>, Cygwin Discussion <cygwin AT cygwin DOT com>
Subject:	Re: Valid file-name characters
References:	<000601c23161$55d02bd0$0200a8c0 AT lifelesswks> <193351029193 DOT 20020722134800 AT logos-m DOT ru>

egor duda wrote:

>Hi!
>
>Monday, 22 July, 2002 Robert Collins robert DOT collins AT syncretize DOT net wrote:
>
>  
>
>>>RC> I was just about to suggest that whatever character is used is used as
>>>RC> an escape char rather than a literal replacement.
>>>
>>>RC> i.e. 
>>>RC> WIN32      CYGWIN
>>>'aux%c' ->> 'aux:'
>>>'aux%%' ->> 'aux%'
>>>
>>>which means that
>>>
>>>s='a%%'
>>>touch $s
>>>notepad $s
>>>
>>>won't work.
>>>      
>>>
>
>RC> Unless cygwin detects that notepad is a non cygwin program, and therefor
>RC> needs the on-disk name.
>
>Even if cygwin knows that notepad is native program it can't tell for
>sure if a%% is name of disk file. It may be a name of my dog to be
>told from my computer speakers, for instance. An he surely won't like
>if i misspell his name ;-)
>
>RC> With 
>'aux%' ->> 'aux:'
>
>RC> s='aux:'
>RC> touch $s
>RC> notepad $s
>
>RC> won't work either - unless cygwin detects that notepad...
>
>That's exactly my point. Having some fancy rules for filename encoding
>breaks interoperability with native tools. Escaping non-valid
>characters like ':' is not big problem, since native tools can't use
>such names anyway. But messing with valid characters like '%' is far
>more dangerous and error-prone.
>
>Egor.            mailto:deo AT logos-m DOT ru ICQ 5165414 FidoNet 2:5020/496.19
>

Before we go too far overboard, translate from "escaped" to "real" only 
in the face of "%ab" where a and b are valid <hex-digit>.
That way, a user could even include the percent sign.  

By the way, if noone recognized it, I'm using an internet standard as a 
model - I'm not sure of the RFC number.

I'm pretty much in favor of a very minimalist approach, and of only 
using it at the interface where we have a known problem.

-- 
David A. Cobb, Software Engineer, Public Access Advocate
"By God's Grace I am a Christian man, by my actions a great sinner." -- The Way of a Pilgrim; R. M. French, tr.
Life is too short to tolerate crappy software.
.



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