Function ncdirect_supported_styles 

pub unsafe extern "C" fn ncdirect_supported_styles(
    nc: *const ncdirect,
) -> u16

Returns a 16-bit bitmask of supported curses-style attributes (NCSTYLE_UNDERLINE, NCSTYLE_BOLD, etc.) The attribute is only indicated as supported if the terminal can support it together with color. For more information, see the “ncv” capability in terminfo(5).