obstack_grow0
void (obstack_grow0) (obstack, data, length)
obstack_grow0 (obstack, data, length);
void obstack_grow0 (struct obstack *obstack, const void *data, int size);
obstack_grow0 (__h, (where), (length)); \
(obstack_grow0 ((h), (where), (length)), obstack_finish ((h)))