determining no. of pages for ps-print-buffer

[Sriram Karra]

I like using 2-up print outs as a rule.  But its quite awkward to have
such a setup if the entire buffer is only a single page long.  So, I
want a wrapper to ps-print-buffer such as:

(defun k-pr-bug ()
  (interactive)
  (let ((ps-n-up-printing (if (= xxx 1)
                              1
                             2)))
    (ps-print-buffer)))

What is the variable name I should instead of "xxx" above?

Thanks,
-Sriram.

-- 
All's well that ends.