Filling a string?

[Marcin Borkowski]

Hi all,

so I want part of the buffer to have wrapped lines (preferably at word
boundaries), and part to have not (like having toggle-truncate lines
only for a region).  I suspect this is not possible, so my next bet is
to have a filling function for a string (so that I can fill it before
inserting into a buffer).  Is there anything like that in Emacs or
should I just use a temp buffer and the built-in filling functions?

TIA,

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