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• Reading-memory-as-strings-or-bytes

Read-memory-zero-terminated

Read memory as bytes till a zero is encountered

Signature

(read-memory-zero-terminated ptr x86 acc) → (mv * * x86)

Returns a list of bytes (byte at the smallest address is the first byte of the list).

Definitions and Theorems

Function: read-memory-zero-terminated

(defun read-memory-zero-terminated (ptr x86 acc)
 (declare (xargs :stobjs (x86)))
 (declare (type (signed-byte 49) ptr))
 (declare (xargs :guard (and (integerp ptr)
                             (<= (- *2^47*) ptr)
                             (<= ptr *2^47*)
                             (nat-listp acc))))
 (let ((__function__ 'read-memory-zero-terminated))
   (declare (ignorable __function__))
   (if
    (signed-byte-p 48 ptr)
    (b* (((mv flg (the (unsigned-byte 8) mem-val)
              x86)
          (rml08 ptr :r x86))
         ((when flg) (mv flg acc x86)))
      (if (equal 0 mem-val)
          (mv nil (append (reverse acc) '(0)) x86)
        (read-memory-zero-terminated (the (signed-byte 49) (1+ ptr))
                                     x86 (cons mem-val acc))))
    (mv t (reverse acc) x86))))

Theorem: byte-listp-mv-nth-1-read-memory-zero-terminated

(defthm byte-listp-mv-nth-1-read-memory-zero-terminated
 (implies
    (and (x86p x86) (byte-listp acc))
    (byte-listp (mv-nth 1
                        (read-memory-zero-terminated ptr x86 acc))))
 :rule-classes :type-prescription)

Theorem: x86p-mv-nth-2-read-memory-zero-terminated

(defthm x86p-mv-nth-2-read-memory-zero-terminated
  (implies
       (x86p x86)
       (x86p (mv-nth 2
                     (read-memory-zero-terminated ptr x86 acc)))))