+#define url_append(buf, append) do { \
+ char *_ptr = (buf)->data; \
+ php_http_url_t *_url = (php_http_url_t *) _ptr, _mem = *_url; \
+ append; \
+ /* relocate */ \
+ if (_ptr != (buf)->data) { \
+ ptrdiff_t diff = (buf)->data - _ptr; \
+ _url = (php_http_url_t *) (buf)->data; \
+ if (_mem.scheme) _url->scheme += diff; \
+ if (_mem.user) _url->user += diff; \
+ if (_mem.pass) _url->pass += diff; \
+ if (_mem.host) _url->host += diff; \
+ if (_mem.path) _url->path += diff; \
+ if (_mem.query) _url->query += diff; \
+ if (_mem.fragment) _url->fragment += diff; \
+ } \
+} while (0)