1ba3d1cf97
Prompted by this thread: https://lobste.rs/s/zntyeq/wc_d_712_characters_without_single_branch
33 lines
1 KiB
Common Lisp
33 lines
1 KiB
Common Lisp
(defpackage wc
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(:use #:cl #:iterate)
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(:export :main))
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(in-package :wc)
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(declaim (optimize (speed 3) (safety 0)))
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(defun main ()
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(let ((filename (cadr sb-ext:*posix-argv*))
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(space (char-code #\Space))
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(newline (char-code #\Newline)))
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(with-open-file (file-stream filename :element-type '(unsigned-byte 8))
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(iter
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(for byte in-stream file-stream using #'read-byte)
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(for previous-byte previous byte)
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(for is-newline = (eq newline byte))
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;; Count each byte
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(sum 1 into bytes)
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;; Count every newline
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(counting is-newline into newlines)
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;; Count every "word", unless the preceding character already
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;; was a space.
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(when (or (eq space previous-byte)
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(eq newline previous-byte))
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(next-iteration))
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(counting (or is-newline (eq space byte))
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into words)
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(declare (fixnum bytes newlines words))
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(finally (format t " ~A ~A ~A ~A~%" newlines words bytes filename))))))
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