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showErrorMsgBox() fix for Windows XP

--- a/src/ft2_video.c

+++ b/src/ft2_video.c

@@ -255,16 +255,20 @@

 void showErrorMsgBox(const char *fmt, ...)

 {

-	char strBuf[256];

+	char strBuf[512+1];

 	va_list args;

 	// format the text string

 	va_start(args, fmt);

-	vsnprintf(strBuf, sizeof (strBuf), fmt, args);

+	vsnprintf(strBuf, sizeof (strBuf)-1, fmt, args);

 	va_end(args);

-	// window can be NULL here, no problem...

-	SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error", strBuf, video.window);

+	// SDL message boxes can be very buggy on Windows XP, use MessageBoxA() instead

+#ifdef _WIN32

+	MessageBoxA(NULL, strBuf, "Error", MB_OK | MB_ICONERROR);

+#else

+	SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error", strBuf, NULL);

+#endif

 }

 static void updateRenderSizeVars(void)