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Lc-nthcdr-str-fast

Fixnum optimized version of lc-nthcdr-str.

Signature

(lc-nthcdr-str-fast n x pos xl line col) → (mv * * *)

Arguments

n — How many characters to advance.
    Guard (natp n).

x — String we're processing.
    Guard (stringp x).

pos — Current index into x.
    Guard (natp pos).

xl — Pre-computed length of x.
    Guard (equal xl (length x)).

line — Current line number.
    Guard (natp line).

col — Current column number.
    Guard (natp col).

Definitions and Theorems

Function: lc-nthcdr-str-fast

(defun lc-nthcdr-str-fast (n x pos xl line col)
 (declare (xargs :guard (and (natp n)
                             (stringp x)
                             (natp pos)
                             (natp line)
                             (natp col)
                             (equal xl (length x)))))
 (declare (type (unsigned-byte 60)
                pos xl line col n)
          (type string x))
 (declare (xargs :guard (and (<= pos xl)
                             (<= line pos)
                             (<= col pos))))
 (let ((__function__ 'lc-nthcdr-str-fast))
  (declare (ignorable __function__))
  (mbe
    :logic
    (lc-nthcdr-str n x pos xl line col)
    :exec
    (b* (((when (or (zp n) (eql pos xl)))
          (mv pos line col))
         ((the character char1) (char x pos))
         ((the (unsigned-byte 60) n) (- n 1))
         ((the (unsigned-byte 60) pos)
          (+ 1 pos)))
      (if (eql char1 #\Newline)
          (lc-nthcdr-str-fast n x pos
                              xl (the (unsigned-byte 60) (+ 1 line))
                              0)
        (lc-nthcdr-str-fast n x pos xl line
                            (the (unsigned-byte 60) (+ 1 col))))))))