Function BMSduplicateBufferMemory_call 

pub unsafe extern "C" fn BMSduplicateBufferMemory_call(
    buffer: *mut BMS_BUFMEM,
    source: *const c_void,
    size: usize,
    filename: *const c_char,
    line: c_int,
) -> *mut c_void

allocates the next unused buffer and copies the given memory into the buffer