;;;;"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.

;;; +++ Foner.  Make this err, since SCM's got its own version, and using
;;; +++ this one (which writes tempfiles) is dire if we were to use it for
;;; +++ an encrypting PTOB.  We've patched SCM to provide this feature, but
;;; +++ other things (like format) still try to require it, and if anything
;;; +++ unexpected happens, they may get it.  So just drop SCM in its tracks.
(error "You must not use the SLIB portable version of string-port.
SCM has its own version, and using this version is unsafe in the
presence of encrypting PTOB's.  (Cleartext could hit the disk.)")

; (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 (string c)))
; 		     (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)))
