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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)))