40 lines
1.1 KiB
Scheme
40 lines
1.1 KiB
Scheme
;; Pretty-printing of IPv4 Internet addresses
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;;; This file is part of the Scheme Untergrund Networking package.
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;;; Copyright (c) 1998 by Mike Sperber.
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;;; For copyright information, see the file COPYING which comes with
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;;; the distribution.
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;; ADDRESS address to pretty-print
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;; SEPERATOR optional, defaults to ".", seperator between address-parts
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;; Example:
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;; (format-internet-host-address #x0a00ffff)
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;; ==> "10.0.255.255"
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;; (format-internet-host-address #x0a00ffff ":")
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;; ==> "10:0:255:255"
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(define (format-internet-host-address address . maybe-separator)
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(let ((extract (lambda (shift)
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(number->string
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(bitwise-and (arithmetic-shift address (- shift))
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255)))))
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(let-optionals maybe-separator ((separator "."))
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(string-append
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(extract 24) separator (extract 16) separator
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(extract 8) separator (extract 0)))))
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;; does pretty-print of ports
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;; Example:
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;; (format-port #x0aff)
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;; => "10,255"
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(define (format-port port)
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(string-append
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(number->string (bitwise-and (arithmetic-shift port -8) 255))
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","
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(number->string (bitwise-and port 255))))
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