Index: dll/win32/kernel32/winnls/string/lang.c
===================================================================
--- dll/win32/kernel32/winnls/string/lang.c	(révision 62120)
+++ dll/win32/kernel32/winnls/string/lang.c	(copie de travail)
@@ -1767,13 +1767,13 @@
  *           str1 is less than, equal to or greater than str2 respectively.
  *  Failure: FALSE. Use GetLastError() to determine the cause.
  */
-INT WINAPI CompareStringA(LCID lcid, DWORD style,
+INT WINAPI CompareStringA(LCID lcid, DWORD flags,
                           LPCSTR str1, INT len1, LPCSTR str2, INT len2)
 {
     WCHAR *buf1W = NtCurrentTeb()->StaticUnicodeBuffer;
     WCHAR *buf2W = buf1W + 130;
     LPWSTR str1W, str2W;
-    INT len1W, len2W, ret;
+    INT len1W = 0, len2W = 0, ret;
     UINT locale_cp = CP_ACP;
 
     if (!str1 || !str2)
@@ -1784,39 +1784,56 @@
     if (len1 < 0) len1 = strlen(str1);
     if (len2 < 0) len2 = strlen(str2);
 
-    if (!(style & LOCALE_USE_CP_ACP)) locale_cp = get_lcid_codepage( lcid );
+    if (!(flags & LOCALE_USE_CP_ACP)) locale_cp = get_lcid_codepage( lcid );
 
-    len1W = MultiByteToWideChar(locale_cp, 0, str1, len1, buf1W, 130);
-    if (len1W)
-        str1W = buf1W;
-    else
+    if (len1)
     {
-        len1W = MultiByteToWideChar(locale_cp, 0, str1, len1, NULL, 0);
-        str1W = HeapAlloc(GetProcessHeap(), 0, len1W * sizeof(WCHAR));
-        if (!str1W)
+        if (len1 <= 130) len1W = MultiByteToWideChar(locale_cp, 0, str1, len1, buf1W, 130);
+        if (len1W)
+            str1W = buf1W;
+        else
         {
-            SetLastError(ERROR_NOT_ENOUGH_MEMORY);
-            return 0;
+            len1W = MultiByteToWideChar(locale_cp, 0, str1, len1, NULL, 0);
+            str1W = HeapAlloc(GetProcessHeap(), 0, len1W * sizeof(WCHAR));
+            if (!str1W)
+            {
+                SetLastError(ERROR_NOT_ENOUGH_MEMORY);
+                return 0;
+            }
+            MultiByteToWideChar(locale_cp, 0, str1, len1, str1W, len1W);
         }
-        MultiByteToWideChar(locale_cp, 0, str1, len1, str1W, len1W);
     }
-    len2W = MultiByteToWideChar(locale_cp, 0, str2, len2, buf2W, 130);
-    if (len2W)
-        str2W = buf2W;
     else
     {
-        len2W = MultiByteToWideChar(locale_cp, 0, str2, len2, NULL, 0);
-        str2W = HeapAlloc(GetProcessHeap(), 0, len2W * sizeof(WCHAR));
-        if (!str2W)
+        len1W = 0;
+        str1W = buf1W;
+    }
+
+    if (len2)
+    {
+        if (len2 <= 130) len2W = MultiByteToWideChar(locale_cp, 0, str2, len2, buf2W, 130);
+        if (len2W)
+            str2W = buf2W;
+        else
         {
-            if (str1W != buf1W) HeapFree(GetProcessHeap(), 0, str1W);
-            SetLastError(ERROR_NOT_ENOUGH_MEMORY);
-            return 0;
+            len2W = MultiByteToWideChar(locale_cp, 0, str2, len2, NULL, 0);
+            str2W = HeapAlloc(GetProcessHeap(), 0, len2W * sizeof(WCHAR));
+            if (!str2W)
+            {
+                if (str1W != buf1W) HeapFree(GetProcessHeap(), 0, str1W);
+                SetLastError(ERROR_NOT_ENOUGH_MEMORY);
+                return 0;
+            }
+            MultiByteToWideChar(locale_cp, 0, str2, len2, str2W, len2W);
         }
-        MultiByteToWideChar(locale_cp, 0, str2, len2, str2W, len2W);
     }
+    else
+    {
+        len2W = 0;
+        str2W = buf2W;
+    }
 
-    ret = CompareStringW(lcid, style, str1W, len1W, str2W, len2W);
+    ret = CompareStringW(lcid, flags, str1W, len1W, str2W, len2W);
 
     if (str1W != buf1W) HeapFree(GetProcessHeap(), 0, str1W);
     if (str2W != buf2W) HeapFree(GetProcessHeap(), 0, str2W);