Function: ring-minus1

ring-minus1 is a byte-compiled function defined in ring.el.gz.

Signature

(ring-minus1 INDEX VECLEN)

Documentation

Return INDEX-1, with wraparound.

Source Code

;; Defined in /usr/src/emacs/lisp/emacs-lisp/ring.el.gz
(defun ring-minus1 (index veclen)
  "Return INDEX-1, with wraparound."
  (- (if (zerop index) veclen index) 1))