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• Sin$c

Sin$c-len

Concrete implementation of strin-len.

Signature

(sin$c-len sin$c) → *

Arguments

sin$c — Guard (sin$c-okp sin$c).

Definitions and Theorems

Function: sin$c-len$inline

(defun sin$c-len$inline (sin$c)
  (declare (xargs :stobjs (sin$c)))
  (declare (xargs :guard (sin$c-okp sin$c)))
  (let ((__function__ 'sin$c-len))
    (declare (ignorable __function__))
    (b* (((the string str) (sin$c-str sin$c))
         ((the (unsigned-byte 60) pos)
          (sin$c-pos sin$c))
         ((the (unsigned-byte 60) len)
          (length str)))
      (the (unsigned-byte 60) (- len pos)))))

Theorem: sin-len{correspondence}

(defthm sin-len{correspondence}
  (implies (and (sin$corr sin$c x) (strin-p x))
           (equal (sin$c-len sin$c)
                  (strin-len x))))