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