[Toybox] wc -L

[enh]

huh, i'd never heard of this (and it's not used in any of the code i
have access to), but debian shows it's used a bit:
https://codesearch.debian.net/search?q=wc%5C+-L&literal=0

On Mon, Feb 5, 2024 at 9:09 AM Rob Landley <rob at landley.net> wrote:
>
> Who was it who asked for wc -L again? Because here's what the debian version is
> doing:
>
> $ echo a | wc -L
> 1
> $ echo -n a | wc -L
> 1
> $ echo -e '\ta' | wc -L
> 9
> $ echo -e '\t\b' | wc -L
> 8
> $ echo -e '\t\b\bx' | wc -L
> 9
> $ echo -e '\t\b\b\b' | wc -L
> 8
> $ echo -e 'abc\td' | wc -L
> 9
> $ echo -e 'abc\bd'
> abd
> $ echo -e 'abc\bd' | wc -L
> 4
> $ echo -e '\x01' | wc -L
> 0
> $ echo -e 'w\xcc\x88'
> ẅ
> $ echo -e 'w\xcc\x88' | wc -L
> 1
> $ wc -m tests/files/utf8/japan.txt
> 25 tests/files/utf8/japan.txt
> $ wc -L tests/files/utf8/japan.txt
> 50 tests/files/utf8/japan.txt
> $ wc -c tests/files/utf8/japan.txt
> 75 tests/files/utf8/japan.txt
>
> So wc -L isn't QUITE the fold.c logic, because it treats backspace like any
> other low ascii character (I.E. width zero). But otherwise it does tabs and
> measures unicode wide and combining characters.
>
> Alas, my first naive implementation... didn't do all that yet.
>
> Rob
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