Fixed bug #275: Leaf node split problem(s).

[idzebra-moved-to-github.git] / isamb / isamb.c

diff --git a/isamb/isamb.c b/isamb/isamb.c
index 675c21e..af6d202 100644 (file)
--- a/isamb/isamb.c
+++ b/isamb/isamb.c
@@ -1,4 +1,4 @@
-/* $Id: isamb.c,v 1.73 2005-03-08 14:02:15 adam Exp $
+/* $Id: isamb.c,v 1.75 2005-03-21 17:20:54 adam Exp $
    Copyright (C) 1995-2005
    Index Data ApS
 
@@ -839,6 +839,7 @@ int insert_leaf (ISAMB b, struct ISAMB_block **sp1, void *lookahead_item,
     int cut_item_size = 0;
     int no_items = 0;    /* number of items (total) */
     int no_items_1 = 0;  /* number of items (first half) */
+    int inserted_dst_bytes = 0;
 
     if (p && p->size)
     {
@@ -852,6 +853,7 @@ int insert_leaf (ISAMB b, struct ISAMB_block **sp1, void *lookahead_item,
         {
             const char *dst_item = 0; /* resulting item to be inserted */
             char *lookahead_next;
+           char *dst_0 = dst;
             int d = -1;
             
             if (lookahead_item)
@@ -877,7 +879,6 @@ int insert_leaf (ISAMB b, struct ISAMB_block **sp1, void *lookahead_item,
             else
                 dst_item = file_item_buf;
 
-              
             if (!*lookahead_mode && d == 0)
             {
                /* it's a deletion and they match so there is nothing to be
@@ -914,7 +915,8 @@ int insert_leaf (ISAMB b, struct ISAMB_block **sp1, void *lookahead_item,
             {
                /* we must move the lookahead pointer */
 
-                if (dst > maxp)
+               inserted_dst_bytes += (dst - dst_0);
+                if (inserted_dst_bytes >=  quater)
                    /* no more room. Mark lookahead as "gone".. */
                     lookahead_item = 0;
                 else
@@ -966,17 +968,19 @@ int insert_leaf (ISAMB b, struct ISAMB_block **sp1, void *lookahead_item,
             }
         }
     }
-    maxp = dst_buf + b->file[b->no_cat-1].head.block_max + quater;
+
     /* this loop runs when we are "appending" to a leaf page. That is
        either it's empty (new) or all file items have been read in
        previous loop */
+
+    maxp = dst_buf + b->file[b->no_cat-1].head.block_max + quater;
     while (lookahead_item)
     {
         char *dst_item;
        const char *src = lookahead_item;
         char *dst_0 = dst;
         
-       /* compare lookahead with max item */
+       /* if we have a lookahead item, we stop if we exceed the value of it */
         if (max_item &&
             (*b->method->compare_item)(max_item, lookahead_item) <= 0)
         {
@@ -1054,6 +1058,7 @@ int insert_leaf (ISAMB b, struct ISAMB_block **sp1, void *lookahead_item,
        
        /* first half */
         p->size = half1 - dst_buf;
+       assert(p->size <=  b->file[p->cat].head.block_max);
         memcpy (p->bytes, dst_buf, half1 - dst_buf);
        p->no_items = no_items_1;
 
@@ -1069,6 +1074,7 @@ int insert_leaf (ISAMB b, struct ISAMB_block **sp1, void *lookahead_item,
         memcpy (first_dst, half2, dst - half2);
 
         (*sp2)->size = (first_dst - (*sp2)->bytes) + (dst - half2);
+       assert((*sp2)->size <=  b->file[p->cat].head.block_max);
        (*sp2)->no_items = no_items - no_items_1;
         (*sp2)->dirty = 1;
         p->dirty = 1;