unsafe fn buffer_update_inner(
_file_size: c_long,
progress_handler: readstat_progress_handler,
user_ctx: *mut c_void,
io_ctx: *mut c_void,
) -> readstat_error_tunsafe fn buffer_update_inner(
_file_size: c_long,
progress_handler: readstat_progress_handler,
user_ctx: *mut c_void,
io_ctx: *mut c_void,
) -> readstat_error_t