Entry Point

Each netlist backend is required to provide a function whose name matches the netlist type. For example, the switcap backend contained in gnet-switcap.scm must provide a function called ``switcap''. That is the function which gnetlist will call to initiate the netlisting. The entry point function is given a single argument which is the filename for the output netlist. Typically the first thing a netlister does is to open the output file for writing.

The following excerpt from the switcap backend shows the start of the entry point function and shows the output file being opened. At the end of the function, the output file is closed.

;; ---------------------------------------
;; Switcap netlist generation -- top level
;; ---------------------------------------
(define switcap
  (lambda (output-filename)
    (let ((port (open-output-file output-filename)))

;; rest of netlisting goes here

;; close the output file and return
      (close-output-port port))))