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Ingy döt Net 2023-07-01 11:58:00 -04:00
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commit cb5bb5e222
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Task/Truncate-a-file/Racket/truncate-a-file.rkt Normal file
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#lang racket
(define (truncate file size)
(unless (file-exists? file) (error 'truncat "missing file: ~a" file))
(when (> size (file-size file)) (printf "Warning: extending file size.\n"))
(call-with-output-file* file #:exists 'update
(λ(o) (file-truncate o size))))