Macro lwprintf_sprintf_ex 

macro_rules! lwprintf_sprintf_ex {
    ( $lwobj:expr, $buf:expr, $format:expr, $( $args:expr ),* ) => { ... };
}

Write formatted data from variable argument list to sized buffer. This macro uses lwprintf_snprintf_ex internally with n set to SIZE_MAX.

WARNING: User is responsible for ensuring that the buffer is large enough to hold the formatted string.