From 4f6f8ef2d8a196e565488daa96198835ac6df40e Mon Sep 17 00:00:00 2001
From: Jacek Caban <jacek@codeweavers.com>
Date: Thu, 16 Oct 2008 14:31:30 -0500
Subject: [PATCH] jscript: Added NaN handling to relational operators.

---
 dlls/jscript/engine.c      | 31 +++++++++++++++++++------------
 dlls/jscript/tests/lang.js | 12 ++++++++++++
 2 files changed, 31 insertions(+), 12 deletions(-)

diff --git a/dlls/jscript/engine.c b/dlls/jscript/engine.c
index 9c539515d1f..815d5fd6667 100644
--- a/dlls/jscript/engine.c
+++ b/dlls/jscript/engine.c
@@ -16,6 +16,9 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
+#include "config.h"
+#include "wine/port.h"
+
 #include <math.h>
 
 #include "jscript.h"
@@ -2599,7 +2602,7 @@ HRESULT not_equal2_expression_eval(exec_ctx_t *ctx, expression_t *_expr, DWORD f
 }
 
 /* ECMA-262 3rd Edition    11.8.5 */
-static HRESULT less_eval(exec_ctx_t *ctx, VARIANT *lval, VARIANT *rval, jsexcept_t *ei, BOOL *ret)
+static HRESULT less_eval(exec_ctx_t *ctx, VARIANT *lval, VARIANT *rval, BOOL greater, jsexcept_t *ei, BOOL *ret)
 {
     VARIANT l, r, ln, rn;
     HRESULT hres;
@@ -2615,7 +2618,7 @@ static HRESULT less_eval(exec_ctx_t *ctx, VARIANT *lval, VARIANT *rval, jsexcept
     }
 
     if(V_VT(&l) == VT_BSTR && V_VT(&r) == VT_BSTR) {
-        *ret = strcmpW(V_BSTR(&l), V_BSTR(&r)) < 0;
+        *ret = (strcmpW(V_BSTR(&l), V_BSTR(&r)) < 0) ^ greater;
         SysFreeString(V_BSTR(&l));
         SysFreeString(V_BSTR(&r));
         return S_OK;
@@ -2629,10 +2632,14 @@ static HRESULT less_eval(exec_ctx_t *ctx, VARIANT *lval, VARIANT *rval, jsexcept
     if(FAILED(hres))
         return hres;
 
-    if(V_VT(&ln) == VT_I4 && V_VT(&rn) == VT_I4)
-        *ret = V_I4(&ln) < V_I4(&rn);
-    else
-        *ret = num_val(&ln) < num_val(&rn);
+    if(V_VT(&ln) == VT_I4 && V_VT(&rn) == VT_I4) {
+        *ret = (V_I4(&ln) < V_I4(&rn)) ^ greater;
+    }else  {
+        DOUBLE ld = num_val(&ln);
+        DOUBLE rd = num_val(&rn);
+
+        *ret = !isnan(ld) && !isnan(rd) && ((ld < rd) ^ greater);
+    }
 
     return S_OK;
 }
@@ -2651,7 +2658,7 @@ HRESULT less_expression_eval(exec_ctx_t *ctx, expression_t *_expr, DWORD flags,
     if(FAILED(hres))
         return hres;
 
-    hres = less_eval(ctx, &lval, &rval, ei, &b);
+    hres = less_eval(ctx, &lval, &rval, FALSE, ei, &b);
     VariantClear(&lval);
     VariantClear(&rval);
     if(FAILED(hres))
@@ -2674,13 +2681,13 @@ HRESULT lesseq_expression_eval(exec_ctx_t *ctx, expression_t *_expr, DWORD flags
     if(FAILED(hres))
         return hres;
 
-    hres = less_eval(ctx, &rval, &lval, ei, &b);
+    hres = less_eval(ctx, &rval, &lval, TRUE, ei, &b);
     VariantClear(&lval);
     VariantClear(&rval);
     if(FAILED(hres))
         return hres;
 
-    return return_bool(ret, !b);
+    return return_bool(ret, b);
 }
 
 /* ECMA-262 3rd Edition    11.8.2 */
@@ -2697,7 +2704,7 @@ HRESULT greater_expression_eval(exec_ctx_t *ctx, expression_t *_expr, DWORD flag
     if(FAILED(hres))
         return hres;
 
-    hres = less_eval(ctx, &rval, &lval, ei, &b);
+    hres = less_eval(ctx, &rval, &lval, FALSE, ei, &b);
     VariantClear(&lval);
     VariantClear(&rval);
     if(FAILED(hres))
@@ -2720,13 +2727,13 @@ HRESULT greatereq_expression_eval(exec_ctx_t *ctx, expression_t *_expr, DWORD fl
     if(FAILED(hres))
         return hres;
 
-    hres = less_eval(ctx, &lval, &rval, ei, &b);
+    hres = less_eval(ctx, &lval, &rval, TRUE, ei, &b);
     VariantClear(&lval);
     VariantClear(&rval);
     if(FAILED(hres))
         return hres;
 
-    return return_bool(ret, !b);
+    return return_bool(ret, b);
 }
 
 /* ECMA-262 3rd Edition    11.4.8 */
diff --git a/dlls/jscript/tests/lang.js b/dlls/jscript/tests/lang.js
index bbafb6ecb4b..2b92d68167b 100644
--- a/dlls/jscript/tests/lang.js
+++ b/dlls/jscript/tests/lang.js
@@ -801,4 +801,16 @@ ok(isFinite(0.5, NaN) === true, "isFinite(0.5, NaN) !== true");
 ok(isFinite(NaN, 0.5) === false, "isFinite(NaN, 0.5) !== false");
 ok(isFinite() === false, "isFinite() !== false");
 
+ok((1 < NaN) === false, "(1 < NaN) !== false");
+ok((1 > NaN) === false, "(1 > NaN) !== false");
+ok((1 <= NaN) === false, "(1 <= NaN) !== false");
+ok((1 >= NaN) === false, "(1 >= NaN) !== false");
+ok((NaN < 1) === false, "(NaN < 1) !== false");
+ok((NaN > 1) === false, "(NaN > 1) !== false");
+ok((NaN <= 1) === false, "(NaN <= 1) !== false");
+ok((NaN >= 1) === false, "(NaN >= 1) !== false");
+ok((Infinity < 2) === false, "(Infinity < 2) !== false");
+ok((Infinity > 2) === true, "(Infinity > 2) !== true");
+ok((-Infinity < 2) === true, "(-Infinity < 2) !== true");
+
 reportSuccess();
-- 
2.11.4.GIT