Function xmlFileRead 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlFileRead(
    context: *mut c_void,
    buffer: *mut c_char,
    len: c_int,
) -> c_int

Read up to len bytes from a FILE * I/O context.

UPSTREAM-PARITY

int xmlFileRead(void *context, char *buffer, int len);