(list from)
(or inc (setq inc 1))
(when (zerop inc) (error "The increment can not be zero"))
- (let (seq (n 0) (next from))
+ (let (seq (n 0) (next from) (last from))
(if (> inc 0)
- (while (<= next to)
+ ;; The (>= next last) condition protects against integer
+ ;; overflow in computing NEXT.
+ (while (and (>= next last) (<= next to))
(setq seq (cons next seq)
n (1+ n)
+ last next
next (+ from (* n inc))))
- (while (>= next to)
+ (while (and (<= next last) (>= next to))
(setq seq (cons next seq)
n (1+ n)
next (+ from (* n inc)))))