From 4df9893256aa6cca90cb0ea14884e9baf16ebf3d Mon Sep 17 00:00:00 2001
From: Valentin Bartenev <vbart@nginx.com>
Date: Thu, 8 Dec 2016 01:52:41 +0300
Subject: [PATCH] Math.pow() method fix.

---
 njs/njs_math.c           | 12 +++++++-
 njs/test/njs_unit_test.c | 60 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+), 1 deletion(-)

diff --git a/njs/njs_math.c b/njs/njs_math.c
index a0c57fe8..cb3f9932 100644
--- a/njs/njs_math.c
+++ b/njs/njs_math.c
@@ -578,7 +578,17 @@ njs_object_math_pow(njs_vm_t *vm, njs_value_t *args, nxt_uint_t nargs,
         base = args[1].data.u.number;
         exponent = args[2].data.u.number;
 
-        num = pow(base, exponent);
+        /*
+         * Accordig to ECMA-262 the result of Math.pow(+/-1, +/-Infinity)
+         * should be NaN.
+         */
+
+        if (fabs(base) != 1 || !isinf(exponent)) {
+            num = pow(base, exponent);
+
+        } else {
+            num = NAN;
+        }
 
     } else {
         num = NAN;
diff --git a/njs/test/njs_unit_test.c b/njs/test/njs_unit_test.c
index dc80130e..4ebb7c5f 100644
--- a/njs/test/njs_unit_test.c
+++ b/njs/test/njs_unit_test.c
@@ -6215,6 +6215,66 @@ static njs_unit_test_t  njs_test[] =
     { nxt_string("Math.pow()"),
       nxt_string("NaN") },
 
+    { nxt_string("Math.pow('a', -0)"),
+      nxt_string("1") },
+
+    { nxt_string("Math.pow(1.1, Infinity)"),
+      nxt_string("Infinity") },
+
+    { nxt_string("Math.pow(-1.1, -Infinity)"),
+      nxt_string("0") },
+
+    { nxt_string("Math.pow(-1, Infinity)"),
+      nxt_string("NaN") },
+
+    { nxt_string("Math.pow(1, -Infinity)"),
+      nxt_string("NaN") },
+
+    { nxt_string("Math.pow(-0.9, Infinity)"),
+      nxt_string("0") },
+
+    { nxt_string("Math.pow(0.9, -Infinity)"),
+      nxt_string("Infinity") },
+
+    { nxt_string("Math.pow('Infinity', 0.1)"),
+      nxt_string("Infinity") },
+
+    { nxt_string("Math.pow(Infinity, '-0.1')"),
+      nxt_string("0") },
+
+    { nxt_string("Math.pow(-Infinity, 3)"),
+      nxt_string("-Infinity") },
+
+    { nxt_string("Math.pow('-Infinity', '3.1')"),
+      nxt_string("Infinity") },
+
+    { nxt_string("Math.pow(-Infinity, '-3')"),
+      nxt_string("-0") },
+
+    { nxt_string("Math.pow('-Infinity', -2)"),
+      nxt_string("0") },
+
+    { nxt_string("Math.pow('0', 0.1)"),
+      nxt_string("0") },
+
+    { nxt_string("Math.pow(0, '-0.1')"),
+      nxt_string("Infinity") },
+
+    { nxt_string("Math.pow(-0, 3)"),
+      nxt_string("-0") },
+
+    { nxt_string("Math.pow('-0', '3.1')"),
+      nxt_string("0") },
+
+    { nxt_string("Math.pow(-0, '-3')"),
+      nxt_string("-Infinity") },
+
+    { nxt_string("Math.pow('-0', -2)"),
+      nxt_string("Infinity") },
+
+    { nxt_string("Math.pow(-3, 0.1)"),
+      nxt_string("NaN") },
+
     { nxt_string("var a = Math.random(); a >= 0 && a < 1"),
       nxt_string("true") },
 
-- 
2.47.3