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• Strtok

Strtok-aux

Fast implementation of strtok.

Definitions and Theorems

Function: strtok-aux

(defun strtok-aux (x n xl delimiters curr acc)
  (declare (type string x)
           (type (integer 0 *) n xl)
           (xargs :guard (and (stringp x)
                              (natp xl)
                              (natp n)
                              (<= xl (length x))
                              (<= n xl)
                              (character-listp delimiters)
                              (character-listp curr)
                              (string-listp acc))))
  (if (mbe :logic (zp (- (nfix xl) (nfix n)))
           :exec (int= n xl))
      (if curr (cons (rchars-to-string curr) acc)
        acc)
    (let* ((char1 (char x n))
           (matchp (member char1 delimiters)))
      (strtok-aux (the string x)
                  (the (integer 0 *) (+ 1 (lnfix n)))
                  (the integer xl)
                  delimiters
                  (if matchp nil (cons char1 curr))
                  (if (and matchp curr)
                      (cons (rchars-to-string curr) acc)
                    acc)))))

Theorem: true-listp-of-strtok-aux

(defthm true-listp-of-strtok-aux
  (implies (true-listp acc)
           (true-listp (strtok-aux x n xl delimiters curr acc))))

Theorem: string-listp-of-strtok-aux

(defthm string-listp-of-strtok-aux
  (implies (string-listp acc)
           (string-listp (strtok-aux x n xl delimiters curr acc))))

Theorem: streqv-implies-equal-strtok-aux-1

(defthm streqv-implies-equal-strtok-aux-1
  (implies (streqv x x-equiv)
           (equal (strtok-aux x n xl delimiters curr acc)
                  (strtok-aux x-equiv n xl delimiters curr acc)))
  :rule-classes (:congruence))