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Ienv

Ienvp

Recognizer for ienv structures.

Signature
(ienvp x) → *

Definitions and Theorems

Function: ienvp

(defun ienvp (x)
 (declare (xargs :guard t))
 (let ((__function__ 'ienvp))
  (declare (ignorable __function__))
  (and
    (mbe :logic
         (and (alistp x)
              (equal (strip-cars x)
                     '(short-bytes int-bytes long-bytes
                                   llong-bytes plain-char-signedp)))
         :exec (fty::alist-with-carsp
                    x
                    '(short-bytes int-bytes long-bytes
                                  llong-bytes plain-char-signedp)))
    (b* ((short-bytes (cdr (std::da-nth 0 x)))
         (int-bytes (cdr (std::da-nth 1 x)))
         (long-bytes (cdr (std::da-nth 2 x)))
         (llong-bytes (cdr (std::da-nth 3 x)))
         (plain-char-signedp (cdr (std::da-nth 4 x))))
      (and (posp short-bytes)
           (posp int-bytes)
           (posp long-bytes)
           (posp llong-bytes)
           (booleanp plain-char-signedp)
           (<= short-bytes int-bytes)
           (<= int-bytes long-bytes)
           (<= long-bytes llong-bytes)
           (<= 2 short-bytes)
           (<= 4 int-bytes)
           (<= 8 long-bytes)
           (<= 8 llong-bytes))))))

Theorem: consp-when-ienvp

(defthm consp-when-ienvp
  (implies (ienvp x) (consp x))
  :rule-classes :compound-recognizer)