From: Deniz Dogan <deniz.a.m.dogan@gmail.com>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: help-gnu-emacs@gnu.org
Subject: Re: How switch from escaped octal character code to escaped HEX?
Date: Mon, 3 Jan 2011 11:13:48 +0100 [thread overview]
Message-ID: <AANLkTinrOvv6D63L9KzXjeVpFvkf94_s2n0xTD4LQ1zd@mail.gmail.com> (raw)
In-Reply-To: <AANLkTin9ZyOMdqVb8jy6ooZPhrzE36c8r1HrT2eRnwjs@mail.gmail.com>
2011/1/3 Deniz Dogan <deniz.a.m.dogan@gmail.com>:
> 2011/1/3 Stefan Monnier <monnier@iro.umontreal.ca>:
>>>> When Emacs find that byte that does
>>>> not correspond to any specific displayable character it display
>>>> octal codes instead, like: \276 (and with different color).
>>>>
>>>> This is useful, but I prefer HEX base instead octal.
>>
>> There is no direct/easy way to do it.
>> But you can do it by adding the corresponding 128 entries to the
>> standard-display-table.
>>
>> E.g.
>>
>> (setq standard-display-table (make-display-table))
>> (aset standard-display-table (unibyte-char-to-multibyte 131)
>> [?\\ ?x ?8 ?3])
>> (aset standard-display-table (unibyte-char-to-multibyte 132)
>> [?\\ ?x ?8 ?4])
>>
>> Should make the bytes 131 and 132 be displayed as \x83 and \x84 rather
>> than \203 and \204.
>>
>>
>
> What is the reasoning behind displaying it in octal rather than
> decimal or hexadecimal in the first place? I didn't know people cared
> about octals anymore.
>
I read on Wikipedia: "Octal representation of non-ASCII bytes may be
particularly handy with UTF-8, where any start byte has octal value
\3nn and any continuation byte has octal value \2nn."
Is this the reason perhaps?
--
Deniz Dogan
next prev parent reply other threads:[~2011-01-03 10:13 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-28 15:39 How switch from escaped octal character code to escaped HEX? Oleksandr Gavenko
2010-12-28 15:51 ` Oleksandr Gavenko
[not found] ` <mailman.6.1293551515.18545.help-gnu-emacs@gnu.org>
2011-01-03 4:23 ` Stefan Monnier
2011-01-03 7:14 ` Deniz Dogan
2011-01-03 10:13 ` Deniz Dogan [this message]
2011-01-03 14:37 ` Peter Dyballa
2011-01-04 4:03 ` Stefan Monnier
[not found] ` <mailman.8.1294038895.27854.help-gnu-emacs@gnu.org>
2011-01-03 13:42 ` Barry Margolin
2011-01-11 10:23 ` Oleksandr Gavenko
[not found] ` <mailman.0.1294741438.20926.help-gnu-emacs@gnu.org>
2011-01-11 17:34 ` Stefan Monnier
2011-01-12 9:22 ` Oleksandr Gavenko
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