Function BMSallocClearBufferMemoryArray_call 

pub unsafe extern "C" fn BMSallocClearBufferMemoryArray_call(
    buffer: *mut BMS_BUFMEM,
    num: usize,
    typesize: usize,
    filename: *const c_char,
    line: c_int,
) -> *mut c_void

allocates the next unused buffer and clears it