enforce maxlength in usernames

[Matthias Andree]

Am 28.07.2011 14:12, schrieb Tito:

> OK, I see. One more try. Eventually we could substitute LOGIN_NAME_MAX
> with 64 as suggested or with 32 as in man useradd. Hints
> for a better error message are welcome.

man useradd is irrelevant, as would the higher-level man adduser be.
These are nonstandard utilities as far as POSIX is concerned, and would
either only relay system limits here, or impose their own arbitrary
limits. Neither is authoritative for busybox.