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• Binary

Binify-width

Convert numbers into readable binary strings, fixing the number of digits printed

(binify x) is identical to hexify-width except that it produces binary output instead of hex output.

Definitions and Theorems

Function: binify-width

(defun binify-width (x width)
 (declare (xargs :guard (posp width)))
 (b* ((width (mbe :logic (if (posp width) width 1)
                  :exec width)))
  (cond
   ((integerp x)
    (b*
     ((xsign (< x 0))
      (xabs (abs x))
      (chars (explode-atom xabs 2))
      (fixed-chars (cond ((<= width (len chars))
                          (nthcdr (- (len chars) width) chars))
                         (t (append (make-list (- width (len chars))
                                               :initial-element #\0)
                                    chars))))
      (nice-chars
       (list*
         #\# #\u #\b
         (append
              (and xsign '(#\-))
              (cons (first fixed-chars)
                    (insert-underscores (nthcdr 1 fixed-chars)))))))
     (implode nice-chars)))
   ((symbolp x) (symbol-name x))
   ((stringp x) x)
   (t (prog2$ (er hard? 'binify-width
                  "Unexpected argument ~x0.~%" x)
              "")))))