Hah, standard stdio code crashed on the test case.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401459

src/file/SDL_rwops.c

@@ -44,7 +44,7 @@ static int win32_file_open(SDL_RWops *context, const char *filename, const char
 	DWORD	must_exist, truncate;
 	int		a_mode;
 
-	if (!context || !filename || !mode)
+	if (!context)
 		return -1;
 		
 	context->hidden.win32io.h = INVALID_HANDLE_VALUE; /* mark this as unusable */
@@ -336,6 +336,11 @@ SDL_RWops *SDL_RWFromFile(const char *file, const char *mode)
 {
 	SDL_RWops *rwops = NULL;
 
+	if ( !file || !*file || !mode || !*mode ) {
+		SDL_SetError("SDL_RWFromFile(): No file or no mode specified");
+		return NULL;
+	}
+
 #ifdef __WIN32__
 	rwops = SDL_AllocRW();
 	if (!rwops)