[Tcsh] "Readable" Unicode in setenv

[H.Merijn Brand]

On Thu, 9 Dec 2021 13:47:52 +0200, Kimmo Suominen <kim at netbsd.org> wrote:

> Hi all,
> 
> I've committed code that implements the dollar-single-quote feature.
> https://github.com/tcsh-org/tcsh/commit/bda86ab754b56d5a8983b554cb1dfffad2f3b43d
> 
> What should we do about these differences:
> 
> We do:
> - \uNNNNNN for unicode code points (six hex digits)

exactly 6 or 2..6?

> - \xNN and \x{NNNN} for "ASCII" char in hex (how is NNNN ASCII?)

in perl \xNN is 8-bit clean, \x{NNNN} can be \x{N} .. \x{NNNNNNNN}

\x{NNN} in perl is an alias to \uNNN as in strings \uNNN is not supported

$ perl -MDP -wE'DPeek "Foo\xE5"'
PV("Foo\345"\0)

$ perl -MDP -wE'DPeek "Foo\x{E5}"'
PV("Foo\345"\0)

$ perl -MDP -wE'DPeek "Foo\x00E5"'
PV("Foo\0E5"\0)

$ perl -MDP -wE'DPeek "Foo\x{00E5}"'
PV("Foo\345"\0)

All over 0xFF will be implicit Unicode (UTF-8)

$ perl -MDP -COE -wE'DPeek "Foo\x{20AC}"'
PV("Foo\342\202\254"\0) [UTF8 "Foo\x{20ac}"]

$ perl -MDP -wE'DPeek "Foo\x{01f685}"'
PV("Foo\360\237\232\205"\0) [UTF8 "Foo\x{1f685}"]

$ perl -MDP -wE'DPeek "Foo\u01f685"'
PV("Foo01f685"\0)


I know I saw input methods that allowed \uNNN and U+NNN to be the same
(N being 1 .. 8 digits)

> FreeBSD sh(1) documents these:
> - \uNNNN and \uNNNNNNNN for unicode code points (four and eight hex digits)
> - \xNN for a byte in hex, where NN can be 1 or more hex digits and
> only last two are used
> 
> We are also missing \cC for a control character. I would have added
> this but ran out of steam for now.
> 
> Cheers,
> + Kimmo


-- 
H.Merijn Brand  https://tux.nl   Perl Monger   http://amsterdam.pm.org/
using perl5.00307 .. 5.33        porting perl5 on HP-UX, AIX, and Linux
https://tux.nl/email.html http://qa.perl.org https://www.test-smoke.org
                           
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