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From: "H. Peter Anvin" <hpa@zytor.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Daniel Barkalow <barkalow@iabervon.org>,
	Paul Eggert <eggert@CS.UCLA.EDU>, Junio C Hamano <junkio@cox.net>,
	Robert Fitzsimons <robfitz@273k.net>,
	Alex Riesen <raa.lkml@gmail.com>,
	git@vger.kernel.org, Kai Ruemmler <kai.ruemmler@gmx.net>
Subject: Re: [PATCH] Try URI quoting for embedded TAB and LF in pathnames
Date: Wed, 12 Oct 2005 13:21:03 -0700
Message-ID: <434D702F.4060409@zytor.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0510121220230.15297@g5.osdl.org>

Linus Torvalds wrote:
> 
> Nope. The traditional vt100 escape sequence is "ESC" followed by a 
> character to indicate the type of sequence (the most common one is '['). 
> That's all 7-bit and fine.
> 
> HOWEVER, they made the 8-bit extension be such that any of these vt100 
> begin sequences where the second character is in the appropriate range can 
> be instead shortened by one character, by instead using a single 8-bit 
> character of "0x80+(char-0x40)". Ie the traditional "ESC + '['" (\x1b\x5b) 
> can also be written as a single '\x9b' character, aka CSI.
> 
> In other words, 0x80-0x9f are _all_ just vt100 shorthand for ESC+'@' 
> through ESC+'_'.
> 
> (I guess it's not strictly "vt100" any more - it's the extended vt220 
> format).
> 

Actually, it's even trickier than that.

CSI is character 0x1b of control code set C1; there are two "windows" 
for control codes -- CL (0x00-0x1f) and CR (0x80-0x9f).  Normally CL is 
mapped to C0 and CR is mapped to CL, but ESC will temporarily map C1 
into CL.

VT1xx didn't support this since they didn't support 8-bit anything.

Anyway, a *lot* of character sets -- not just UTF-8 -- use the CR range 
of bytes for printables.

	-hpa

  reply index

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-10-07 19:35 [RFC] " Junio C Hamano
2005-10-07 23:29 ` Alex Riesen
2005-10-07 23:44   ` Junio C Hamano
2005-10-08  6:45     ` Alex Riesen
2005-10-08  9:10       ` Junio C Hamano
2005-10-08 13:30         ` [PATCH] Try URI quoting for " Robert Fitzsimons
2005-10-08 18:30           ` Junio C Hamano
2005-10-08 20:19             ` Junio C Hamano
2005-10-11  6:20               ` Paul Eggert
2005-10-11  7:37                 ` Junio C Hamano
2005-10-11 15:17                 ` Linus Torvalds
2005-10-11 18:03                   ` Paul Eggert
2005-10-11 18:37                     ` Linus Torvalds
2005-10-11 19:42                       ` Paul Eggert
2005-10-11 20:56                         ` Linus Torvalds
2005-10-12  6:51                           ` Paul Eggert
2005-10-12 14:59                             ` Linus Torvalds
2005-10-12 19:07                               ` Daniel Barkalow
2005-10-12 19:52                                 ` Linus Torvalds
2005-10-12 20:21                                   ` H. Peter Anvin [this message]
     [not found]                               ` <87vf02qy79.fsf@penguin.cs.ucla.edu>
2005-10-12 21:02                                 ` Junio C Hamano
2005-10-12 21:05                                 ` Linus Torvalds
2005-10-12 21:09                                   ` H. Peter Anvin
2005-10-12 21:15                                   ` Johannes Schindelin
2005-10-12 21:33                                   ` Junio C Hamano
2005-10-14  0:57                                   ` Paul Eggert
2005-10-14  5:43                                     ` Linus Torvalds
2005-10-12 21:24                                 ` Linus Torvalds
2005-10-14  0:16                                   ` Paul Eggert
2005-10-14  5:20                                     ` Linus Torvalds
2005-10-14 17:18                                       ` H. Peter Anvin
2005-10-14  6:59                                 ` Junio C Hamano
2005-10-09 10:42           ` Junio C Hamano

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