A little lisp help

[Peter Lee]

I'm learning lisp atm, and decided to write a macro to insert curly
braces around a region and re-indent.

So for this,

if (x)
    y=0;

z=0;
w=0;
*

setting mark at begining of line y=0 and setting point at * would
produce the following.

if (x)
    {
    y=0;

    z=0;
    w=0;
    }

This is what I have so far, but it doesn't work very well.

(defun curly-brace-region (mark point)
  "Inserts curly braces around region and indents"
  (interactive "r")
  (message "point=%d, mark=%d" point mark)
  (goto-char mark)
  (insert-string "{")
  (newline-and-indent)
  (goto-char point)
  (insert-string "}")
  (newline-and-indent)
  (fill-region mark point))

There's probably functions to make this trivial and I'm just missing
them due to lack of familiarity.

TIA.