wc with raw devices

gxwc2.ss

(import :std/net/bio
        :std/sort
        :std/srfi/1)
(export main)
(declare (not safe))

(def (read-next-word buf)
  (let lp ((chars []))
    (let (next (bio-read-char buf))
      (cond
       ((eof-object? next)
        (if (null? chars)
          next
          (list->string (reverse! chars))))
       ((or (eq? next #\space) (eq? next #\newline))
        (list->string (reverse! chars)))
       (else
        (lp (cons next chars)))))))

(def (main path)
  (let ((words (make-hash-table))
        (buf (open-file-input-buffer path)))
    (let lp ()
      (let (word (read-next-word buf))
        (unless (eof-object? word)
          (hash-update! words word fx1+ 0)
          (lp))))
    (for-each (lambda (x) (displayln (car x) " " (cdr x)))
              (sort! (hash->list words)
                     (lambda (a b) (> (cdr a) (cdr b)))))))