[PATCH] improve checks on usernames V3.

[Harald Becker]

 Hallo Ralf!

On 02.08.2011 22:16, Ralf Friedl wrote:
> What is the problem with locale-specific characters?

Portability is the problem. Especially if tar files of such users and
untar it on other systems those "none-portable" user names may produce
trouble. Sometimes serious trouble. I've had to deal with such trouble
in past. Trouble witch stupid users produced by delivering tar archives
with such user names.

... just to throw that in. Beside this I like to use User Names with
German Umlauts (ÄÖÜäöü) as regular German names may contain those. And I
did this successfully on Linux/GNU systems for years ... but know about
incompatibility and try to handle properly.

--
Harald