ibuf_from_buffer
ibuf_from_buffer(buf, ibuf_data(from), ibuf_size(from));
ibuf_from_buffer(new, ibuf_data(buf), len);
ibuf_from_buffer(&rbuf, msgbuf->rbuf, msgbuf->roff);
ibuf_from_buffer(&msg, ibuf_data(&rbuf),
void ibuf_from_buffer(struct ibuf *, void *, size_t);
ibuf_from_buffer(&in, vectors[t].data, vectors[t].size);
ibuf_from_buffer(&out,
ibuf_from_buffer(&out,
ibuf_from_buffer(&ibuf, mre->aspath, mre->aspath_len);
ibuf_from_buffer(&ibuf, mre->attrs[j].attr,
ibuf_from_buffer(&ibuf, NULL, 0);
ibuf_from_buffer(&reachbuf, NULL, 0);
ibuf_from_buffer(&unreachbuf, NULL, 0);
ibuf_from_buffer(&sbuf, &subtype, sizeof(subtype));
ibuf_from_buffer(&ibuf, data, datalen);