GNU bug report logs - #27270
display-raw-bytes-as-hex generates ambiguous output for Emacs strings

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Vasilij Schneidermann <v.schneidermann <at> gmail.com>
Cc: Lars Ingebrigtsen <larsi <at> gnus.org>, 27270 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>, npostavs <at> users.sourceforge.net
Subject: bug#27270: display-raw-bytes-as-hex generates ambiguous output for Emacs strings
Date: Sun, 24 Apr 2022 15:46:55 -0700

On 4/24/22 02:56, Vasilij Schneidermann wrote:

> Under which conditions exactly does the bug happen?

I run into it with emacs -nw or equivalent, which I often use when I 
have a high-latency network connection so GUI Emacs is too slow. A few 
people even run Emacs from text consoles, with no graphics or windowing 
system at all, though I'm usually not that hard-core.


> trying to work around terminals being bad doesn't
> seem worth the extra effort.

Please bear with us poor users who don't always use GUIs...


> what exactly should the logic be here?
> Detect if there's a preceding hex escaped byte and if yes, display
> adjacent bytes that are formatted using hex characters using escaping,
> too?

Simpler than that. When hex-escaping a character, Emacs would look at 
the next character and if it's hexadecimal would print "\ " (or some 
similar escaping approach). This is a simple test and won't hurt 
printing performance much in the usual case.

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