;;; TAIL -- One of the Kernighan and Van Wyk benchmarks.

(define inport #f)
(define outport #f)

(define (readline port line-so-far)
  (let ((x (read-char port)))
    (cond ((eof-object? x)
           x)
          ((char=? x #\newline)
           (list->string (reverse
                          (cons x line-so-far))))
          (#t (readline port (cons x line-so-far))))))

(define (tail-r-aux port file-so-far)
  (let ((x (readline port '())))
    (if (eof-object? x)
        (begin
          (display file-so-far outport)
          (close-output-port outport))
        (tail-r-aux port (cons x file-so-far)))))

(define (tail-r port)
  (tail-r-aux port '()))

(define (go)
  (set! inport (open-input-file "../../src/bib"))
  (set! outport (open-output-file "foo"))
  (tail-r inport)
  (close-input-port inport))

(define (main . args)
  (run-benchmark
   "tail"
   tail-iters
   (lambda (result) #t)
   (lambda () (lambda () (go)))))