Zebra with full functionality

[idzebra-moved-to-github.git] / rset / rsisamc.c

diff --git a/rset/rsisamc.c b/rset/rsisamc.c
index fb429ad..110bbcd 100644 (file)
--- a/rset/rsisamc.c
+++ b/rset/rsisamc.c
@@ -1,43 +1,26 @@
 /*
- * Copyright (C) 1994-1996, Index Data I/S 
+ * Copyright (C) 1994-2002, Index Data
  * All rights reserved.
- * Sebastian Hammer, Adam Dickmeiss
- *
- * $Log: rsisamc.c,v $
- * Revision 1.4  1997-12-18 10:54:25  adam
- * New method result set method rs_hits that returns the number of
- * hits in result-set (if known). The ranked result set returns real
- * number of hits but only when not combined with other operands.
- *
- * Revision 1.3  1997/10/31 12:37:01  adam
- * Code calls xfree() instead of free().
- *
- * Revision 1.2  1996/11/08 11:15:57  adam
- * Compressed isam fully supported.
- *
- * Revision 1.1  1996/10/29 13:41:48  adam
- * First use of isamc.
  *
+ * $Id: rsisamc.c,v 1.11 2002-04-05 08:46:26 adam Exp $
  */
 
+
 #include <stdio.h>
 #include <assert.h>
-#include <rsisamc.h>
 #include <zebrautl.h>
+#include <rsisamc.h>
 
-static void *r_create(const struct rset_control *sel, void *parms,
-                      int *flags);
+static void *r_create(RSET ct, const struct rset_control *sel, void *parms);
 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_hits (RSET ct, void *oi);
-static int r_read (RSFD rfd, void *buf);
+static int r_read (RSFD rfd, void *buf, int *term_index);
 static int r_write (RSFD rfd, const void *buf);
-static int r_score (RSFD rfd, int *score);
 
-static const rset_control control = 
+static const struct rset_control control = 
 {
     "isamc",
     r_create,
@@ -46,43 +29,49 @@ static const rset_control control =
     r_delete,
     r_rewind,
     r_count,
-    r_hits,
     r_read,
     r_write,
-    r_score
 };
 
-const rset_control *rset_kind_isamc = &control;
+const struct rset_control *rset_kind_isamc = &control;
 
 struct rset_pp_info {
     ISAMC_PP pt;
     struct rset_pp_info *next;
     struct rset_isamc_info *info;
+    int *countp;
+    void *buf;
 };
 
 struct rset_isamc_info {
     ISAMC   is;
     ISAMC_P pos;
+    int key_size;
+    int (*cmp)(const void *p1, const void *p2);
     struct rset_pp_info *ispt_list;
 };
 
-static void *r_create(const struct rset_control *sel, void *parms,
-                      int *flags)
+static void *r_create(RSET ct, const struct rset_control *sel, void *parms)
 {
-    rset_isamc_parms *pt = parms;
+    rset_isamc_parms *pt = (rset_isamc_parms *) parms;
     struct rset_isamc_info *info;
 
-    *flags |= RSET_FLAG_VOLATILE;
-    info = xmalloc (sizeof(*info));
+    ct->flags |= RSET_FLAG_VOLATILE;
+    info = (struct rset_isamc_info *) xmalloc (sizeof(*info));
     info->is = pt->is;
     info->pos = pt->pos;
+    info->key_size = pt->key_size;
+    info->cmp = pt->cmp;
     info->ispt_list = NULL;
+    ct->no_rset_terms = 1;
+    ct->rset_terms = (RSET_TERM *) xmalloc (sizeof(*ct->rset_terms));
+    ct->rset_terms[0] = pt->rset_term;
     return info;
 }
 
 RSFD r_open (RSET ct, int flag)
 {
-    struct rset_isamc_info *info = ct->buf;
+    struct rset_isamc_info *info = (struct rset_isamc_info *) ct->buf;
     struct rset_pp_info *ptinfo;
 
     logf (LOG_DEBUG, "risamc_open");
@@ -91,11 +80,16 @@ RSFD r_open (RSET ct, int flag)
        logf (LOG_FATAL, "ISAMC set type is read-only");
        return NULL;
     }
-    ptinfo = xmalloc (sizeof(*ptinfo));
+    ptinfo = (struct rset_pp_info *) xmalloc (sizeof(*ptinfo));
     ptinfo->next = info->ispt_list;
     info->ispt_list = ptinfo;
     ptinfo->pt = isc_pp_open (info->is, info->pos);
     ptinfo->info = info;
+    if (ct->rset_terms[0]->nn < 0)
+       ct->rset_terms[0]->nn = isc_pp_num (ptinfo->pt);
+    ct->rset_terms[0]->count = 0;
+    ptinfo->countp = &ct->rset_terms[0]->count;
+    ptinfo->buf = xmalloc (info->key_size);
     return ptinfo;
 }
 
@@ -107,6 +101,7 @@ static void r_close (RSFD rfd)
     for (ptinfop = &info->ispt_list; *ptinfop; ptinfop = &(*ptinfop)->next)
         if (*ptinfop == rfd)
         {
+            xfree ((*ptinfop)->buf);
             isc_pp_close ((*ptinfop)->pt);
             *ptinfop = (*ptinfop)->next;
             xfree (rfd);
@@ -118,10 +113,12 @@ static void r_close (RSFD rfd)
 
 static void r_delete (RSET ct)
 {
-    struct rset_isamc_info *info = ct->buf;
+    struct rset_isamc_info *info = (struct rset_isamc_info *) ct->buf;
 
     logf (LOG_DEBUG, "rsisamc_delete");
     assert (info->ispt_list == NULL);
+    rset_term_destroy (ct->rset_terms[0]);
+    xfree (ct->rset_terms);
     xfree (info);
 }
 
@@ -136,14 +133,21 @@ static int r_count (RSET ct)
     return 0;
 }
 
-static int r_hits (RSET ct, void *oi)
+static int r_read (RSFD rfd, void *buf, int *term_index)
 {
-    return -1;
-}
-
-static int r_read (RSFD rfd, void *buf)
-{
-    return isc_pp_read( ((struct rset_pp_info*) rfd)->pt, buf);
+    struct rset_pp_info *pinfo = (struct rset_pp_info *) rfd;
+    int r;
+    *term_index = 0;
+    r = isc_pp_read(pinfo->pt, buf);
+    if (r > 0)
+    {
+        if (*pinfo->countp == 0 || (*pinfo->info->cmp)(buf, pinfo->buf) > 1)
+        {
+            memcpy (pinfo->buf, buf, pinfo->info->key_size);
+            (*pinfo->countp)++;
+        }
+    }
+    return r;
 }
 
 static int r_write (RSFD rfd, const void *buf)
@@ -151,9 +155,3 @@ static int r_write (RSFD rfd, const void *buf)
     logf (LOG_FATAL, "ISAMC set type is read-only");
     return -1;
 }
-
-static int r_score (RSFD rfd, int *score)
-{
-    *score = -1;
-    return -1;
-}