ps-printing-region

ps-printing-region is a variable defined in `ps-print.el'.
Its value is

nil

Documentation:
Variable used to indicate the region that ps-print is printing.
It is a cons, the car of which is the line number where the region begins, and
its cdr is the total number of lines in the buffer. Formatting functions can
use this information to print the original line number (and not the number of
lines printed), and to indicate in the header that the printout is of a partial
file.