pdu_readbuf_read
size_t pdu_readbuf_read(struct pdu_readbuf *, void *, size_t);
pdu_readbuf_read(&c->prbuf, ipdu, sizeof(*ipdu));
n = pdu_readbuf_read(&c->prbuf,
return l + pdu_readbuf_read(rb, (char *)ptr + l,
