Re: \c-handling in $'-strings

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From	"Helmut Karlowski" <helmut.karlowski@ish.de>
Newsgroups	gnu.bash.bug
Subject	Re: \c-handling in $'-strings
Date	Tue, 01 Sep 2015 23:46:28 +0100
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Am 31.08.2015, 15:17 Uhr,SCHRIEB Chet Ramey <chet.ramey@case.edu>:

> Conversion to a control character is effected by ANDing with 0x1f, since
> the valid control character range is 0-0x1f.  If you have something  
> that's
> not a valid control character after being ANDed with 0x1f, you get
> undefined results.
>
> There is a table in
>
> http://pubs.opengroup.org/onlinepubs/9699919799/utilities/stty.html#tag_20_123

Do you refer to the table titled "Circumflex Control Characters in stty"?

It states for example:

?	<DEL>

Running:

echo $'\c?' |od -a
echo $'\c[\c\\c]\c^\c_\c?' |od -a

bash prints:

0000000  us  nl
0000002
0000000 esc  fs   c   ]  rs  us  us  nl

I'd expect:

0000000 del  nl
0000002
0000000 esc  fs  gs  rs  us del  nl

Also the ] in the output seems wrong, looks it gets the \\ wrong, though  
ksh93 does this also.

Not a serious issue ...

-Helmut

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Thread

\c-handling in $'-strings "Helmut Karlowski" <helmut.karlowski@ish.de> - 2015-08-29 00:28 +0100
  Re: \c-handling in $'-strings Chet Ramey <chet.ramey@case.edu> - 2015-08-31 10:17 -0400
    Re: \c-handling in $'-strings "Helmut Karlowski" <helmut.karlowski@ish.de> - 2015-09-01 23:46 +0100
      Re: \c-handling in $'-strings Chet Ramey <chet.ramey@case.edu> - 2015-09-02 09:19 -0400
        Re: \c-handling in $'-strings "Helmut Karlowski" <helmut.karlowski@ish.de> - 2015-09-02 22:10 +0100
          Re: \c-handling in $'-strings Eric Blake <eblake@redhat.com> - 2015-09-02 15:44 -0600
          Re: \c-handling in $'-strings Chet Ramey <chet.ramey@case.edu> - 2015-09-03 09:58 -0400

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