Function dc_iostream_purge 

pub unsafe extern "C" fn dc_iostream_purge(
    iostream: *mut dc_iostream_t,
    direction: dc_direction_t,
) -> dc_status_t

Discards all data from the internal buffers.

@param[in] iostream A valid I/O stream. @param[in] direction The direction of the buffer(s). @returns #DC_STATUS_SUCCESS on success, or another #dc_status_t code on failure.