rem: anchor = anchor_lump(&_m->add_rm, _m->unparsed - _m->buf, 0, 0);
add: anchor = anchor_lump(_m, _m->unparsed - _m->buf, 0, 0);
context: static inline int append_rpid_helper(struct sip_msg* _m, str *_s){	struct lump* anchor;	char *s;		if (parse_headers(_m, HDR_EOH, 0) == -1) {		LOG(L_ERR, "append_rpid(): Error while parsing message\n");		return -1;	}		anchor = anchor_lump(&_m->add_rm, _m->unparsed - _m->buf, 0, 0);	if (!anchor) {		LOG(L_ERR, "append_rpid(): Can't get anchor\n");		return -2;	}		s = pkg_malloc(_s->len);	if (!s) {		LOG(L_ERR, "append_rpid(): No memory left\n");	}		memcpy(s, _s->s, _s->len);	if (!insert_new_lump_before(anchor, s, _s->len, 0)) {		LOG(L_ERR, "append_rpid(): Can't insert lump\n");		pkg_free(s);		return -3;	}	return 0;}