numeric.c: 0 % Float::NAN returns Float::NAN

* numeric.c (flodivmod): all results are NaN if divisor is NaN.
  [fix GH-692]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47024 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 1 deletions

diff --git a/numeric.c b/numeric.c
index 3689165dd8..1e971f41ea 100644
--- a/numeric.c
+++ b/numeric.c
@@ -890,6 +890,12 @@ flodivmod(double x, double y, double *divp, double *modp)
 {
     double div, mod;
 
+    if (isnan(y)) {
+	/* y is NaN so all results are NaN */
+	if (modp) *modp = y;
+	if (divp) *divp = y;
+	return;
+    }
     if (y == 0.0) rb_num_zerodiv();
     if ((x == 0.0) || (isinf(y) && !isinf(x)))
         mod = x;
@@ -903,7 +909,7 @@ flodivmod(double x, double y, double *divp, double *modp)
 	mod = x - z * y;
 #endif
     }
-    if (isinf(x) && !isinf(y) && !isnan(y))
+    if (isinf(x) && !isinf(y))
 	div = x;
     else
 	div = (x - mod) / y;