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Re: performance bug of `wc -m`

From: Kaz Kylheku (Coreutils)
Subject: Re: performance bug of `wc -m`
Date: Thu, 24 May 2018 17:32:09 -0700
User-agent: Roundcube Webmail/0.9.2

On 2018-05-20 16:43, Bruno Haible wrote:
Kaz Kylheku wrote in :

In what situation are there printable characters in the range [0, UCHAR_MAX) that
have a width > 1?

That's the wrong question. The question is which characters in this range
have width > 1 or <= 0.

The program below shows that the answer (on a glibc system) is:
The character 0x00AD (= SOFT HYPHEN) is printable but has width == 0.

I tried printing this on several terminals; all actually render something that is one character position wide.

A program which calculates column positions on a terminal will be wrong if 0xAD
has been printed, and it relies on this bogus datum from glibc.

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