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51 lines
1.7 KiB
Scheme
51 lines
1.7 KiB
Scheme
;;;;"strport.scm" Portable string ports for Scheme
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;;;Copyright 1993 Dorai Sitaram and Aubrey Jaffer.
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;
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;Permission to copy this software, to redistribute it, and to use it
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;for any purpose is granted, subject to the following restrictions and
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;understandings.
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;
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;1. Any copy made of this software must include this copyright notice
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;in full.
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;
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;2. I have made no warrantee or representation that the operation of
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;this software will be error-free, and I am under no obligation to
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;provide any services, by way of maintenance, update, or otherwise.
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;
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;3. In conjunction with products arising from the use of this
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;material, there shall be no use of my name in any advertising,
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;promotional, or sales literature without prior written consent in
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;each case.
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;N.B.: This implementation assumes you have tmpnam and
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;delete-file defined in your .init file. tmpnam generates
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;temp file names. delete-file may be defined to be a dummy
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;procedure that does nothing.
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(define (call-with-output-string f)
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(let ((tmpf (tmpnam)))
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(call-with-output-file tmpf f)
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(let ((s "") (buf (make-string 512)))
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(call-with-input-file tmpf
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(lambda (inp)
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(let loop ((i 0))
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(let ((c (read-char inp)))
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(cond ((eof-object? c)
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(set! s (string-append s (substring buf 0 i))))
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((>= i 512)
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(set! s (string-append s buf (string c)))
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(loop 0))
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(else
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(string-set! buf i c)
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(loop (+ i 1))))))))
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(delete-file tmpf)
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s)))
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(define (call-with-input-string s f)
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(let ((tmpf (tmpnam)))
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(call-with-output-file tmpf
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(lambda (outp)
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(display s outp)))
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(let ((x (call-with-input-file tmpf f)))
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(delete-file tmpf)
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x)))
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