On Tue 29 Jan 2013 20:22, Neil Jerram <[email protected]> writes:
> (define (read-csv file-name)
> (let ((s (utf16->string (get-bytevector-all (open-input-file file-name))
> 'little)))
>
> ;; Discard possible byte order mark.
> (if (and (>= (string-length s) 1)
> (char=? (string-ref s 0) #\xfeff))
> (set! s (substring s 1)))
>
> ...))
FWIW the procedure I had was:
(define (consume-byte-order-mark port)
(let ((enc (or (port-encoding port) "ISO-8859-1")))
(set-port-encoding! port "ISO-8859-1")
(case (peek-char port)
((#\xEF)
(read-char port)
(case (peek-char port)
((#\xBB)
(read-char port)
(case (peek-char port)
((#\xBF)
(read-char port)
(set-port-encoding! port "UTF-8"))
(else
(unread-char #\xBB port)
(unread-char #\xEF port)
(set-port-encoding! port enc))))
(else
(unread-char #\xEF port)
(set-port-encoding! port enc))))
((#\xFE)
(read-char port)
(case (peek-char port)
((#\xFF)
(read-char port)
(set-port-encoding! port "UTF-16BE"))
(else
(unread-char #\xFE port)
(set-port-encoding! port enc))))
((#\xFF)
(read-char port)
(case (peek-char port)
((#\xFE)
(read-char port)
(set-port-encoding! port "UTF-16LE"))
(else
(unread-char #\xFF port)
(set-port-encoding! port enc))))
(else
(set-port-encoding! port enc)))))
The encoding dance is because there is no unread-u8 from Scheme, only
unread-char.
Andy
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