Need strnlen().

[John Mashey]

> One should never allow a character array to not have a null terminating byte.
> Doing things like this should be automatic. 
Yes, except that for (at the time, and perhaps still) good reasons,
certain structures had strings that might not be null-terminated.
Such include directories (except in 4.2), accounting file command names, 
utmp/wtmp.  Those things are why the strn* routines were written in
the first place.

I generally agree with the first advice, but there are at least a few
occasions where one extra byte is fairly handy.
-- 
-john mashey
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