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• Sin$c

Sin$c-nthcdr

Concrete implementation of strin-nthcdr.

Signature

(sin$c-nthcdr n sin$c) → sin$c

Arguments

n — Guard (natp n).

sin$c — Guard (sin$c-okp sin$c).

Definitions and Theorems

Function: sin$c-nthcdr

(defun sin$c-nthcdr (n sin$c)
  (declare (xargs :stobjs (sin$c)))
  (declare (xargs :guard (and (natp n) (sin$c-okp sin$c))))
  (let ((__function__ 'sin$c-nthcdr))
    (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) line)
          (sin$c-line sin$c))
         ((the (unsigned-byte 60) col)
          (sin$c-col sin$c))
         ((the (unsigned-byte 60) len)
          (length str))
         ((mv (the (unsigned-byte 60) new-pos)
              (the (unsigned-byte 60) new-line)
              (the (unsigned-byte 60) new-col))
          (if (< (the (integer 0 *) n) (expt 2 60))
              (lc-nthcdr-str-fast n str pos len line col)
            (ec-call (lc-nthcdr-str-fast n str pos len line col))))
         (sin$c (update-sin$c-line new-line sin$c))
         (sin$c (update-sin$c-col new-col sin$c)))
      (update-sin$c-pos new-pos sin$c))))

Theorem: sin-nthcdr{correspondence}

(defthm sin-nthcdr{correspondence}
  (implies (and (sin$corr sin$c sin)
                (natp n)
                (strin-p sin))
           (sin$corr (sin$c-nthcdr n sin$c)
                     (strin-nthcdr n sin))))