Function _estrndup 

pub unsafe extern "C" fn _estrndup(
    s: *const c_char,
    length: usize,
    __zend_filename: *const c_char,
    __zend_lineno: u32,
    __zend_orig_filename: *const c_char,
    __zend_orig_lineno: u32,
) -> *mut c_char