Function xmlBufferAddHead 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlBufferAddHead(
    _buf: *mut _xmlBuffer,
    _str: *const xmlChar,
    _len: c_int,
) -> c_int

Write to a buffer at a position.

UPSTREAM-PARITY

int xmlBufferAddHead(xmlBufferPtr buf, const xmlChar *str, int len);