On Sat, Oct 8, 2016 at 1:06 PM, Jens Axel Søgaard <jensa...@soegaard.net>
wrote:
> Hi All,
>
> The following interaction shows how the reader can be used to construct a
> surrogate character:
>
> > (string-ref "\ud800\udc00" 0)
> #\đ
>
> Given the two hexadecimal numbers d800 and dc00 how do I
> construct the surrogate character directly?
>
> /Jens Axel
>
>
I think you have to do the arithmetic yourself. Something like:
(define (utf-16-surrogate-pair->char hi lo)
(integer->char
(+ #x10000
(arithmetic-shift (bitwise-and hi #x03ff) 10)
(bitwise-and lo #x03ff))))
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