[Tcsh] backslashed escape sequences in echo

[H.Merijn Brand]

On Tue, 2 Jul 2024 11:52:29 +0200, Michal Szymanski <msz at astrouw.edu.pl> wrote:

> Hi,
> 
> I've just noticed a changed behavior of 'echo' command with octal
> \xxxx sequence. Most of the machines run Rocky Linux 8.10 with tcsh
> 6.20.00. One of my aliases includes command (simplified here)
>   echo "a \0140 b"
> which has been working for years giving
> a ` b
> 
> Now on my Ubuntu desktop recently upgraded to 24.04, coming (what a
> coincidence :) with tcsh 6.24.10, this has broke and the output is now
> a 
>   0 b

That change happened between 6.23.00 and 6.23.01
38 commits (merge commits excluded)

I just verified that e6c9f58b10797e1b793c70782aad239f7087a037 (my work
to improve Unicode support) is the cause.

https://github.com/tcsh-org/tcsh/commit/06915a414e185d314d5117b04ee460e441cbe962

> To get the previous behavior, I have to remove the 0, echo "a \140 b"
> 
> It works as such even if I change $echo_style from the default "both"
> to "sysv" when it should, AFAIU, mimic the SYSV behavior of echo(1).
> This is not true as the echo(1) requires 0 before 1 to 3 octal digits,
> at least in the manual:
> 
>        \0NNN  byte with octal value NNN (1 to 3 digits)
> 
> In the real world, however, both versions give the octal-coded char:
> 
> >/usr/bin/echo -e "a \140 b"  
> a ` b
> >/usr/bin/echo -e "a \0140 b"  
> a ` b
> 
> Is that to be expected? When was it introduced? I cannot find any
> "Changelog" file in tcsh sources. There is "Fixes" file, and "BUGS"
> file, but no Changelog. The most recent mention of 'octal' in "Fixes"
> is from May 12, 2010 and refers to V6.17.02.
> 
> best, Michal
> 


-- 
H.Merijn Brand  https://tux.nl   Perl Monger   http://amsterdam.pm.org/
using perl5.00307 .. 5.37        porting perl5 on HP-UX, AIX, and Linux
https://tux.nl/email.html http://qa.perl.org https://www.test-smoke.org
                           
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 488 bytes
Desc: OpenPGP digital signature
URL: <https://mailman.astron.com/pipermail/tcsh/attachments/20240702/2472e082/attachment.asc>