Function screen_vprintf 

pub unsafe extern "C" fn screen_vprintf(
    txt_fmt: text_format_e_t,
    line: i16,
    text: *const c_char,
    ...
) -> u32

Print a formatted string to the screen on the specified line

Same as display_printf except that this uses a va_list instead of the ellipsis operator so this can be used by other functions.

Will default to a medium sized font by default if invalid txt_fmt is given. Exposed mostly for writing libraries and custom functions.

This function uses the following values of errno when an error state is reached: EACCESS - Another resource is currently trying to access the screen mutex.

\param txt_fmt Text format enum that determines if the text is medium, large, medium_center, or large_center. (DOES NOT SUPPORT SMALL) \param line The line number on which to print \param text Format string \param args List of arguments for the format string

\return 1 if there were no errors, or PROS_ERR if an error occured while taking or returning the screen mutex.