+ rset_rewind (info->rset_l, p->rfd_l);
+ rset_rewind (info->rset_r, p->rfd_r);
+ p->more_l = rset_read (info->rset_l, p->rfd_l, p->buf_l);
+ p->more_r = rset_read (info->rset_r, p->rfd_r, p->buf_r);
+}
+
+static int r_count (RSET ct)
+{
+ return 0;
+}
+
+static int r_read_and (RSFD rfd, void *buf)
+{
+ struct rset_bool_rfd *p = rfd;
+ struct rset_bool_info *info = p->info;
+
+ while (p->more_l && p->more_r)
+ {
+ int cmp;
+
+ cmp = (*info->cmp)(p->buf_l, p->buf_r);
+ if (!cmp)
+ {
+ memcpy (buf, p->buf_l, info->key_size);
+ p->more_l = rset_read (info->rset_l, p->rfd_l, p->buf_l);
+ p->more_r = rset_read (info->rset_r, p->rfd_r, p->buf_r);
+ return 1;
+ }
+ else if (cmp == 1)
+ {
+ memcpy (buf, p->buf_r, info->key_size);
+ p->more_r = rset_read (info->rset_r, p->rfd_r, p->buf_r);
+ return 1;
+ }
+ else if (cmp == -1)
+ {
+ memcpy (buf, p->buf_l, info->key_size);
+ p->more_l = rset_read (info->rset_l, p->rfd_l, p->buf_l);
+ return 1;
+ }
+ else if (cmp > 1)
+ p->more_r = rset_read (info->rset_r, p->rfd_r, p->buf_r);
+ else
+ p->more_l = rset_read (info->rset_l, p->rfd_l, p->buf_l);
+ }
+ return 0;