Re: print formated special characteres

On 2020-10-17 20:51:36 +0200, Matthias Apitz wrote:
> El día sábado, octubre 17, 2020 a las 03:37:46p. m. -0300, Celso Lorenzetti escribió:
>
> > Somebody help me, please.
> >
> > How to make the texts are aligned with 10 characters?
> >
> >
> >
> > elog(INFO, "\n%-10s Fim\n%-10s Fim\n", "Variável", "Variavel");

Which programming language is this? PL/pgSQL?

> Hola Celso,
>
> You can reproduce the same on the UNIX shell with:
>
> $ printf "\n%-10s Fim\n%-10s Fim\n" "Variável" "Variavel"
>
> Variável Fim
> Variavel Fim

Hmm. Zsh gets it right:

trintignant:~ 0:31 :-) 1032% printf "\n%-10s Fim\n%-10s Fim\n" "Variável" "Variavel"

Variável Fim
Variavel Fim

As do Perl and Python.

> The second test (changing the accented char 'á' by 'X'), shows that the
> problem/bug is a) more generic, not only in PostgreSQL and b) has todo
> with being the UTF-8 char 'á' a two byte char, while 'X' is only one
> byte.

Yes, determining how much space a UTF-8 sequence occupies on screen is
surprisingly hard. I'm not sure what the C standard says about that. But
these days I would expect any programming language to get it right at
least for the simple cases.

hp

--
_ | Peter J. Holzer | Story must make more sense than reality.
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