[tor-commits] [tor/master] Make CEIL_DIV() slightly more overflow-safe

[nickm at torproject.org]

commit c5adab025852c68bc637c4fbfa34c44cde7397bb
Author: Taylor Yu <catalyst at torproject.org>
Date:   Wed Apr 5 14:52:48 2017 -0400

    Make CEIL_DIV() slightly more overflow-safe
---
 src/common/util.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/common/util.h b/src/common/util.h
index cfe47f0..18eb57f 100644
--- a/src/common/util.h
+++ b/src/common/util.h
@@ -163,9 +163,9 @@ int64_t clamp_double_to_int64(double number);
 void simplify_fraction64(uint64_t *numer, uint64_t *denom);
 
 /* Compute the CEIL of <b>a</b> divided by <b>b</b>, for nonnegative <b>a</b>
- * and positive <b>b</b>.  Works on integer types only. Not defined if a+b can
- * overflow. */
-#define CEIL_DIV(a,b) (((a)+(b)-1)/(b))
+ * and positive <b>b</b>.  Works on integer types only. Not defined if a+(b-1)
+ * can overflow. */
+#define CEIL_DIV(a,b) (((a)+((b)-1))/(b))
 
 /* Return <b>v</b> if it's between <b>min</b> and <b>max</b>.  Otherwise
  * return <b>min</b> if <b>v</b> is smaller than <b>min</b>, or <b>max</b> if