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copy version of ##sys#char->utf8-string added by liao on Mon Dec 13 04:09:04 2021

(import (chicken fixnum))
(import utf8)

(define (ichar->utf8-string c)
  (let ([i (char->integer c)])
    (cond [(fx<= i #x7F)
           (string c) ]
          [(fx<= i #x7FF)
           (string (integer->char (fxior #b11000000 (fxshr i 6)))
	           (integer->char (fxior #b10000000 (fxand i #b111111)))) ]
          [(fx<= i #xFFFF)
           (string (integer->char (fxior #b11100000 (fxshr i 12)))
	           (integer->char (fxior #b10000000 (fxand (fxshr i 6) #b111111)))
	           (integer->char (fxior #b10000000 (fxand i #b111111)))) ]
          [(fx<= i #x1FFFFF)
           (string (integer->char (fxior #b11110000 (fxshr i 18)))
	           (integer->char (fxior #b10000000 (fxand (fxshr i 12) #b111111)))
	           (integer->char (fxior #b10000000 (fxand (fxshr i 6) #b111111)))
	           (integer->char (fxior #b10000000 (fxand i #b111111)))) ]
          [else
           (error "UTF-8 codepoint out of range:" i) ] ) ) )
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