# Arguments: $current_x$ : the current logical x # $data_size$ : # of items in a stack element # @stack : the stack of directives # # Return Values: $max_x$ : the maximum logical x value found # @stack : the stack with logical x values assigned # Description: Look at each element in the stack. Logical x becomes greater # each time an if is encountered and smaller at each endif. # Each element is assigned a logical x value and the stack is # returned.