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 [thread overview]
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
next prev parent reply other threads:[~2005-10-12 20:21 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-07 19:35 [RFC] embedded TAB and LF in pathnames 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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