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• Dec-digit-string-p

Dec-digit-string-p-aux

Signature

(dec-digit-string-p-aux x n xl) → *

Arguments

x — Guard (stringp x).

n — Guard (natp n).

xl — Guard (eql xl (length x)).

Definitions and Theorems

Function: dec-digit-string-p-aux

(defun dec-digit-string-p-aux (x n xl)
 (declare (type string x)
          (type unsigned-byte n)
          (type unsigned-byte xl))
 (declare (xargs :guard (and (stringp x)
                             (natp n)
                             (eql xl (length x)))))
 (declare (xargs :split-types t :guard (<= n xl)))
 (let ((acl2::__function__ 'dec-digit-string-p-aux))
   (declare (ignorable acl2::__function__))
   (mbe :logic
        (dec-digit-char-list*p (nthcdr n (explode x)))
        :exec
        (if (eql n xl)
            t
          (and (dec-digit-char-p (char x n))
               (dec-digit-string-p-aux x (the unsigned-byte (+ 1 n))
                                       xl))))))