diff options
Diffstat (limited to 'lisp/subr.el')
| -rw-r--r-- | lisp/subr.el | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lisp/subr.el b/lisp/subr.el index 6e679e70f7e..b66ff288b7a 100644 --- a/lisp/subr.el +++ b/lisp/subr.el @@ -486,13 +486,16 @@ of course, also replace TO with a slightly larger value (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))))) |