Implementation of RtlGetNtVersionNumbers.

dlls/ntdll/ntdll.spec

@@ -385,7 +385,7 @@
 @ stdcall RtlFreeUnicodeString(ptr) RtlFreeUnicodeString
 @ stub RtlGenerate8dot3Name
 @ stdcall RtlGetAce(ptr long ptr) RtlGetAce
-@ stub RtlGetNtVersionNumbers
+@ stdcall RtlGetNtVersionNumbers(ptr ptr ptr) RtlGetNtVersionNumbers
 @ stub RtlGetVersion
 @ stub RtlGetCallersAddress
 @ stub RtlGetCompressionWorkSpaceSize

dlls/ntdll/rtl.c

@@ -492,3 +492,31 @@ void WINAPI RtlAssert(LPVOID x1,LPVOID x2,DWORD x3, DWORD x4)
 {
 	FIXME("(%p,%p,0x%08lx,0x%08lx),stub\n",x1,x2,x3,x4);
 }
+
+/******************************************************************************
+ *  RtlGetNtVersionNumbers       [NTDLL.@]
+ *
+ * Introduced in Windows XP (NT5.1)
+ */
+void WINAPI RtlGetNtVersionNumbers(LPDWORD major, LPDWORD minor, LPDWORD build)
+{
+	OSVERSIONINFOEXW versionInfo;
+	versionInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEXW);
+	GetVersionExW((OSVERSIONINFOW*)&versionInfo);
+
+	if (major)
+	{
+		*major = versionInfo.dwMajorVersion;
+	}
+
+	if (minor)
+	{
+		*minor = versionInfo.dwMinorVersion;
+	}
+
+	if (build)
+	{
+		/* FIXME: Does anybody know the real formula? */
+		*build = (0xF0000000 | versionInfo.dwBuildNumber);
+	}
+}