* Sebastian Hammer, Adam Dickmeiss
*
* $Log: rsnull.c,v $
- * Revision 1.1 1995-09-06 10:35:44 adam
+ * Revision 1.8 1996-10-29 13:55:24 adam
+ * Include of zebrautl.h instead of alexutil.h.
+ *
+ * Revision 1.7 1995/12/11 09:15:25 adam
+ * New set types: sand/sor/snot - ranked versions of and/or/not in
+ * ranked/semi-ranked result sets.
+ * Note: the snot not finished yet.
+ * New rset member: flag.
+ * Bug fix: r_delete in rsrel.c did free bad memory block.
+ *
+ * Revision 1.6 1995/10/12 12:41:57 adam
+ * Private info (buf) moved from struct rset_control to struct rset.
+ * Bug fixes in relevance.
+ *
+ * Revision 1.5 1995/10/10 14:00:04 adam
+ * Function rset_open changed its wflag parameter to general flags.
+ *
+ * Revision 1.4 1995/10/06 14:38:06 adam
+ * New result set method: r_score.
+ * Local no (sysno) and score is transferred to retrieveCtrl.
+ *
+ * Revision 1.3 1995/09/08 14:52:42 adam
+ * Work on relevance feedback.
+ *
+ * Revision 1.2 1995/09/07 13:58:43 adam
+ * New parameter: result-set file descriptor (RSFD) to support multiple
+ * positions within the same result-set.
+ * Boolean operators: and, or, not implemented.
+ *
+ * Revision 1.1 1995/09/06 10:35:44 adam
* Null set implemented.
*
*/
#include <stdio.h>
#include <rsnull.h>
-#include <alexutil.h>
+#include <zebrautl.h>
-static rset_control *r_create(const struct rset_control *sel, void *parms);
-static int r_open (rset_control *ct, int wflag);
-static void r_close (rset_control *ct);
-static void r_delete (rset_control *ct);
-static void r_rewind (rset_control *ct);
-static int r_count (rset_control *ct);
-static int r_read (rset_control *ct, void *buf);
-static int r_write (rset_control *ct, const void *buf);
+static void *r_create(const struct rset_control *sel, void *parms,
+ int *flags);
+static RSFD r_open (RSET ct, int flag);
+static void r_close (RSFD rfd);
+static void r_delete (RSET ct);
+static void r_rewind (RSFD rfd);
+static int r_count (RSET ct);
+static int r_read (RSFD rfd, void *buf);
+static int r_write (RSFD rfd, const void *buf);
+static int r_score (RSFD rfd, int *score);
static const rset_control control =
{
- "NULL set type",
- 0,
+ "null",
r_create,
r_open,
r_close,
r_rewind,
r_count,
r_read,
- r_write
+ r_write,
+ r_score
};
const rset_control *rset_kind_null = &control;
-static rset_control *r_create(const struct rset_control *sel, void *parms)
+static void *r_create(const struct rset_control *sel, void *parms,
+ int *flags)
{
- rset_control *newct;
-
- logf (LOG_DEBUG, "rsnull_create(%s)", sel->desc);
- newct = xmalloc(sizeof(*newct));
- memcpy(newct, sel, sizeof(*sel));
- return newct;
+ return NULL;
}
-static int r_open(rset_control *ct, int wflag)
+static RSFD r_open (RSET ct, int flag)
{
- if (wflag)
+ if (flag & RSETF_WRITE)
{
logf (LOG_FATAL, "NULL set type is read-only");
- return -1;
+ return NULL;
}
- return 0;
+ return "";
}
-static void r_close(rset_control *ct)
+static void r_close (RSFD rfd)
{
- /* NOP */
}
-static void r_delete(rset_control *ct)
+static void r_delete (RSET ct)
{
- xfree(ct);
}
-static void r_rewind(rset_control *ct)
+static void r_rewind (RSFD rfd)
{
logf (LOG_DEBUG, "rsnull_rewind");
}
-static int r_count (rset_control *ct)
+static int r_count (RSET ct)
{
return 0;
}
-static int r_read (rset_control *ct, void *buf)
+static int r_read (RSFD rfd, void *buf)
{
return 0;
}
-static int r_write (rset_control *ct, const void *buf)
+static int r_write (RSFD rfd, const void *buf)
{
logf (LOG_FATAL, "NULL set type is read-only");
return -1;
}
+
+static int r_score (RSFD rfd, int *score)
+{
+ *score = -1;
+ return -1;
+}
+