* numeric.c (flo_round): get rid of overflow.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@17498 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 10 insertions, 5 deletions

diff --git a/numeric.c b/numeric.c
index 318d6046f3..187044ee5e 100644
--- a/numeric.c
+++ b/numeric.c
@@ -1299,11 +1299,16 @@ flo_round(int argc, VALUE *argv, VALUE num)
     while  (--i >= 0)
 	f = f*10.0;
 
-    if (ndigits < 0) number /= f;
-    else number *= f;
-    number = round(number);
-    if (ndigits < 0) number *= f;
-    else number /= f;
+    if (isinf(f)) {
+	if (ndigits < 0) number = 0;
+    }
+    else {
+	if (ndigits < 0) number /= f;
+	else number *= f;
+	number = round(number);
+	if (ndigits < 0) number *= f;
+	else number /= f;
+    }
 
     if (ndigits > 0) return DOUBLE2NUM(number);