A more sophisticated (format "%f" ...)?

[Marcin Borkowski]

Hi all,

I need to format a float so that I get /at most/ 2 decimal digits after
point /and/ at most 5 characters altogether.  For instance,

2 -> 2
2.34567 -> 2.35
123.456 -> 123.5
123456 -> XXXXX (since this is too long to fit in 5 characters;
alternatively, I can more or less safely assume that it's less than 1000)

Is there anything like that in Elisp (or some library), or do I have to
write it myself?

TIA,

-- 
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Faculty of Mathematics and Computer Science
Adam Mickiewicz University