/* int rset_forward(RSFD rfd, void *buf, void *untilbuf); */
#define rset_forward(rfd, buf, untilbuf) \
(*(rfd)->rset->control->f_forward)((rfd),(buf),(untilbuf))
/* int rset_forward(RSFD rfd, void *buf, void *untilbuf); */
#define rset_forward(rfd, buf, untilbuf) \
(*(rfd)->rset->control->f_forward)((rfd),(buf),(untilbuf))