save_joystick_data - Saves joystick calibration data. Allegro game programming
int save_joystick_data(const char *filename);
After all the headache of calibrating the joystick, you may not want to make
your poor users repeat the process every time they run your program. Call this
function to save the joystick calibration data into the specified
configuration file, from which it can later be read by load_joystick_data().
Pass a NULL filename to write the data to the currently selected configuration
Returns zero on success, non-zero if the data could not be saved.