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• Octal

Oct-digit-chars-value

Coerces a oct-digit-char-list*p into a natural number.

Signature

(oct-digit-chars-value x) → value

Arguments

x — Guard (oct-digit-char-list*p x).

Returns

value — Type (natp value).

For instance, (oct-digit-chars-value '(#1 #7)) is 15. See also parse-octal-from-charlist for a more flexible function that can tolerate non-octal characters after the number.

Definitions and Theorems

Function: oct-digit-chars-value$inline

(defun oct-digit-chars-value$inline (x)
  (declare (xargs :guard (oct-digit-char-list*p x)))
  (let ((acl2::__function__ 'oct-digit-chars-value))
    (declare (ignorable acl2::__function__))
    (mbe :logic
         (if (consp x)
             (+ (ash (oct-digit-char-value (car x))
                     (* 3 (1- (len x))))
                (oct-digit-chars-value (cdr x)))
           0)
         :exec (oct-digit-chars-value1 x 0))))

Theorem: natp-of-oct-digit-chars-value

(defthm natp-of-oct-digit-chars-value
  (b* ((value (oct-digit-chars-value$inline x)))
    (natp value))
  :rule-classes :type-prescription)

Theorem: icharlisteqv-implies-equal-oct-digit-chars-value-1

(defthm icharlisteqv-implies-equal-oct-digit-chars-value-1
  (implies (icharlisteqv x x-equiv)
           (equal (oct-digit-chars-value x)
                  (oct-digit-chars-value x-equiv)))
  :rule-classes (:congruence))

Theorem: unsigned-byte-p-of-oct-digit-chars-value

(defthm unsigned-byte-p-of-oct-digit-chars-value
  (unsigned-byte-p (* 3 (len x))
                   (oct-digit-chars-value x)))

Theorem: oct-digit-chars-value-upper-bound

(defthm oct-digit-chars-value-upper-bound
  (< (oct-digit-chars-value x)
     (expt 2 (* 3 (len x))))
  :rule-classes ((:rewrite) (:linear)))

Theorem: oct-digit-chars-value-upper-bound-free

(defthm oct-digit-chars-value-upper-bound-free
  (implies (equal n (len x))
           (< (oct-digit-chars-value x)
              (expt 2 (* 3 n)))))

Theorem: oct-digit-chars-value1-removal

(defthm oct-digit-chars-value1-removal
  (implies (natp val)
           (equal (oct-digit-chars-value1 x val)
                  (+ (oct-digit-chars-value x)
                     (ash (nfix val) (* 3 (len x)))))))

Theorem: oct-digit-chars-value-of-append

(defthm oct-digit-chars-value-of-append
  (equal (oct-digit-chars-value (append x (list a)))
         (+ (ash (oct-digit-chars-value x) 3)
            (oct-digit-char-value a))))

Subtopics

Oct-digit-chars-value1