-static int r_read_and(RSFD rfd, void *buf, TERMID *term)
-{
- struct rfd_private *p=(struct rfd_private *)rfd->priv;
- const struct rset_key_control *kctrl=rfd->rset->keycontrol;
-
- while (p->more_l || p->more_r)
- {
- int cmp;
-
- if (p->more_l && p->more_r)
- cmp = (*kctrl->cmp)(p->buf_l, p->buf_r);
- else if (p->more_l)
- cmp = -rfd->rset->scope;
- else
- cmp = rfd->rset->scope;
-#if RSET_DEBUG
- yaz_log(YLOG_DEBUG, "r_read_and [%p] looping: m=%d/%d c=%d t=%d",
- rfd, p->more_l, p->more_r, cmp, p->tail);
- (*kctrl->log_item)(YLOG_DEBUG, p->buf_l, "left ");
- (*kctrl->log_item)(YLOG_DEBUG, p->buf_r, "right ");
-#endif
- if (!cmp)
- { /* cmp==0 */
- memcpy (buf, p->buf_l, kctrl->key_size);
- if (term)
- *term=p->term_l;
- p->more_l = rset_read(p->rfd_l, p->buf_l, &p->term_l);
- p->tail = 1;
- }
- else if ( (cmp>0) && (cmp<rfd->rset->scope))
- { /* typically cmp == 1 */
- memcpy (buf, p->buf_r, kctrl->key_size);
- if (term)
- *term=p->term_r;
- p->more_r = rset_read(p->rfd_r, p->buf_r, &p->term_r);
- p->tail = 1;
-#if RSET_DEBUG
- yaz_log(YLOG_DEBUG, "r_read_and [%p] returning R m=%d/%d c=%d",
- rfd, p->more_l, p->more_r, cmp);
- key_logdump(YLOG_DEBUG,buf);
- (*kctrl->log_item)(YLOG_DEBUG, buf, "");
-#endif
- p->hits++;
- return 1;
- }
- else if ( (cmp<0) && (-cmp<rfd->rset->scope))
- { /* cmp == -1 */
- memcpy (buf, p->buf_l, kctrl->key_size);
- if (term)
- *term=p->term_l;
- p->more_l = rset_read(p->rfd_l, p->buf_l,&p->term_l);
- p->tail = 1;
-#if RSET_DEBUG
- yaz_log(YLOG_DEBUG, "r_read_and [%p] returning L m=%d/%d c=%d",
- rfd, p->more_l, p->more_r, cmp);
- (*kctrl->log_item)(YLOG_DEBUG, buf, "");
-#endif
- p->hits++;
- return 1;
- }
- else if (cmp >= rfd->rset->scope )
- { /* cmp == 2 */
- if (p->tail)
- {
- memcpy (buf, p->buf_r, kctrl->key_size);
- if (term)
- *term=p->term_r;
- p->more_r = rset_read(p->rfd_r, p->buf_r, &p->term_r);
- if (!p->more_r || (*kctrl->cmp)(p->buf_r, buf) > 1)
- p->tail = 0;
-#if RSET_DEBUG
- yaz_log(YLOG_DEBUG, "r_read_and [%p] returning R tail m=%d/%d c=%d",
- rfd, p->more_l, p->more_r, cmp);
- (*kctrl->log_item)(YLOG_DEBUG, buf, "");
-#endif
- p->hits++;
- return 1;
- }
- else
- {
-#if RSET_DEBUG
- yaz_log(YLOG_DEBUG, "r_read_and [%p] about to forward R "
- "m=%d/%d c=%d",
- rfd, p->more_l, p->more_r, cmp);
-#endif
- if (p->more_r && p->more_l)
- p->more_r = rset_forward( p->rfd_r, p->buf_r,
- &p->term_r, p->buf_l);
- else
- return 0; /* no point in reading further */
- }
- }
- else
- { /* cmp == -2 */
- if (p->tail)
- {
- memcpy (buf, p->buf_l, kctrl->key_size);
- if (term)
- *term = p->term_l;
- p->more_l = rset_read(p->rfd_l, p->buf_l, &p->term_l);
- if (!p->more_l || (*kctrl->cmp)(p->buf_l, buf) > 1)
- p->tail = 0;
-#if RSET_DEBUG
- yaz_log(YLOG_DEBUG, "r_read_and [%p] returning L tail m=%d/%d c=%d",
- rfd, p->more_l, p->more_r, cmp);
- (*kctrl->log_item)(YLOG_DEBUG, buf, "");
-#endif
- p->hits++;
- return 1;
- }
- else
- {
-#if RSET_DEBUG
- yaz_log(YLOG_DEBUG, "r_read_and [%p] about to forward L "
- "m=%d/%d c=%d",
- rfd, p->more_l, p->more_r, cmp);
-#endif
- if (p->more_r && p->more_l)
- p->more_l = rset_forward(p->rfd_l, p->buf_l,
- &p->term_l, p->buf_r);
- else
- return 0; /* no point in reading further */
- }
- }
- }
-#if RSET_DEBUG
- yaz_log(YLOG_DEBUG, "r_read_and [%p] reached its end",rfd);
-#endif
- return 0;
-}
-
-static int r_read_or (RSFD rfd, void *buf, TERMID *term)
-{
- struct rfd_private *p = (struct rfd_private *)rfd->priv;
- const struct rset_key_control *kctrl = rfd->rset->keycontrol;
-
- while (p->more_l || p->more_r)
- {
- int cmp;
-
- if (p->more_l && p->more_r)
- cmp = (*kctrl->cmp)(p->buf_l, p->buf_r);
- else if (p->more_r)
- cmp = rfd->rset->scope;
- else
- cmp = -rfd->rset->scope;
- if (!cmp)
- { /* cmp==0 */
- memcpy (buf, p->buf_l, kctrl->key_size);
- if (term)
- *term = p->term_l;
- p->more_l = rset_read(p->rfd_l, p->buf_l, &p->term_l);
- /* FIXME - is this right, should we not leave _r as it is */
- /* and return that in the next read, so that ranking etc */
- /* get to see both? */
- p->more_r = rset_read(p->rfd_r, p->buf_r, &p->term_r);
-#if RSET_DEBUG
- yaz_log(YLOG_DEBUG, "r_read_or returning A m=%d/%d c=%d",
- p->more_l, p->more_r, cmp);
- (*kctrl->log_item)(YLOG_DEBUG, buf, "");
-#endif
- p->hits++;
- return 1;
- }
- else if (cmp > 0)
- {
- memcpy (buf, p->buf_r, kctrl->key_size);
- if (term)
- *term = p->term_r;
- p->more_r = rset_read(p->rfd_r, p->buf_r, &p->term_r);
-#if RSET_DEBUG
- yaz_log(YLOG_DEBUG, "r_read_or returning B m=%d/%d c=%d",
- p->more_l, p->more_r, cmp);
- (*kctrl->log_item)(YLOG_DEBUG, buf, "");
-#endif
- p->hits++;
- return 1;
- }
- else
- {
- memcpy (buf, p->buf_l, kctrl->key_size);
- if (term)
- *term = p->term_l;
- p->more_l = rset_read( p->rfd_l, p->buf_l, &p->term_l);
-#if RSET_DEBUG
- yaz_log(YLOG_DEBUG, "r_read_or returning C m=%d/%d c=%d",
- p->more_l, p->more_r, cmp);
- (*kctrl->log_item)(YLOG_DEBUG, buf, "");
-#endif
- p->hits++;
- return 1;
- }
- }
- return 0;
-}
-