sformno - return current form number
int sformno ()
The forms stored in the formfile are numbered starting with 1,
and this function returns the number of the current form. This
function is useful in determining which form is currently on the
terminal screen when each form requires different processing.
Sformno is an obsolete function included for compatibility with
old versions of C/Base. New user edit routines should use
Sformno is only available in user edit routines.