M_BUFADDR
(m->m_data - M_BUFADDR(m));
(m->m_data - M_BUFADDR(m));
ap = M_BUFADDR(mt);
(m->m_data - M_BUFADDR(m));
(m->m_data - M_BUFADDR(m));
+ (m->m_data - M_BUFADDR(m));
(m->m_data - M_BUFADDR(m));
m_dat = M_BUFADDR(m);
buf_start = (uint8_t *)M_BUFADDR(m);
low = M_BUFADDR(n);
(m->m_data - M_BUFADDR(m));
#define MRESETDATA(m) (m)->m_data = M_BUFADDR(m)
(M_READONLY((m)) ? 0 : ((m)->m_data - M_BUFADDR(m)))