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Re: Unicode escape sequence | Re: draft-ietf-httpbis-header-structure-00, unicode range

"Poul-Henning Kamp" <phk@phk.freebsd.dk> Wed, 14 December 2016 09:25 UTC

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To: Matthew Kerwin <matthew@kerwin.net.au>
cc: Kari Hurtta <hurtta-ietf@elmme-mailer.org>, Ilari Liusvaara <ilariliusvaara@welho.com>, HTTP working group mailing list <ietf-http-wg@w3.org>, Poul-Henning Kamp <phk@varnish-cache.org>
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From: Poul-Henning Kamp <phk@phk.freebsd.dk>
References: <20161213173327.C1F7D1714B@welho-filter2.welho.com> <20161213175419.GA7943@LK-Perkele-V2.elisa-laajakaista.fi> <25434.1481665395@critter.freebsd.dk> <201612140628.uBE6SO3L025885@shell.siilo.fmi.fi> <36792.1481701328@critter.freebsd.dk> <CACweHNDKgWQewZHb=Kz3_2=41M58sY5472Q5OwpqPLxorvkzHQ@mail.gmail.com>
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Subject: Re: Unicode escape sequence | Re: draft-ietf-httpbis-header-structure-00, unicode range
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--------
In message <CACweHNDKgWQewZHb=Kz3_2=41M58sY5472Q5OwpqPLxorvkzHQ@mail.gmail.com>
, Matthew Kerwin writes:

>If we're looking for inspiration elsewhere, why not C99?
>
>      "\" %x75 1*4HEXDIG
>    / "\" %x55 1*6HEXDIG  ; C99 accepts 1*8

The variable length means these run into the mess of "what if the
next character is a hex digit?".

That's a much bigger issue when we're talking about code spitting
out strings than when it is programmers typing them in.

I would prefer to make them fixed length:

	"\" "u" 4HEXDIG
	"\" "U" 6HEXDIG 

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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