Function lv_vsnprintf 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn lv_vsnprintf(
    _: *mut c_char,
    _: usize,
    _: *const c_char,
    _: *mut c_void,
) -> c_int

Format a string with variable arguments

Safety

This function is unsafe because it dereferences raw pointers.