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• Read-bytes$-n

Read-8s-n

(read-8s-n n channel state) reads n signed bytes from the input channel and returns them as a list.

Definitions and Theorems

Function: tr-read-8s-n

(defun
 tr-read-8s-n (n channel state acc)
 (declare (xargs :guard (and (natp n)
                             (state-p state)
                             (symbolp channel)
                             (open-input-channel-p channel
                                                   :byte state)
                             (true-listp acc))))
 (if
  (mbe :logic (zp n) :exec (= 0 n))
  (mv (reverse acc) state)
  (mv-let (byte state)
          (read-8s channel state)
          (cond ((eq byte nil) (mv 'fail state))
                (t (tr-read-8s-n (1- n)
                                 channel state (cons byte acc)))))))

Function: read-8s-n

(defun
  read-8s-n (n channel state)
  (declare (xargs :guard (and (natp n)
                              (state-p state)
                              (symbolp channel)
                              (open-input-channel-p channel
                                                    :byte state))))
  (mbe :logic
       (if (zp n)
           (mv nil state)
           (mv-let (byte state)
                   (read-8s channel state)
                   (cond ((eq byte nil) (mv 'fail state))
                         (t (mv-let (rest state)
                                    (read-8s-n (1- n) channel state)
                                    (mv (if (eq rest 'fail)
                                            'fail
                                            (cons byte rest))
                                        state))))))
       :exec (tr-read-8s-n n channel state nil)))

Theorem: read-8s-n-state

(defthm read-8s-n-state
        (implies (and (force (state-p1 state))
                      (force (symbolp channel))
                      (force (open-input-channel-p1 channel
                                                    :byte state)))
                 (state-p1 (mv-nth 1 (read-8s-n n channel state)))))

Theorem: read-8s-n-open-input-channel

(defthm
     read-8s-n-open-input-channel
     (implies (and (force (state-p1 state))
                   (force (symbolp channel))
                   (force (open-input-channel-p1 channel
                                                 :byte state)))
              (open-input-channel-p1
                   channel
                   :byte (mv-nth 1 (read-8s-n n channel state)))))

Theorem: read-8s-n-data

(defthm
   read-8s-n-data
   (implies (not (equal (mv-nth 0 (read-8s-n n channel state))
                        'fail))
            (and (true-listp (mv-nth 0 (read-8s-n n channel state)))
                 (equal (len (mv-nth 0 (read-8s-n n channel state)))
                        (nfix n)))))