Function xmlReadIO 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlReadIO(
    ioread: Option<xmlInputReadCallback>,
    ioclose: Option<xmlInputCloseCallback>,
    ioctx: *mut c_void,
    URL: *const c_char,
    encoding: *const c_char,
    options: c_int,
) -> *mut _xmlDoc

Read an XML document from I/O callbacks.

UPSTREAM-PARITY

xmlDocPtr xmlReadIO(xmlInputReadCallback ioread, xmlInputCloseCallback ioclose,
                    void *ioctx, const char *URL, const char *encoding, int options);