Extend isamb_merge read handler with new insert mode.

Extend isamb_merge read handler, read_item, with new insert mode of
value 2. Like 1 this means "insertion", but, unlike 1, forces an existing
key to be replaced even though the comparison is 0. Until now ISAMB
has assumed "same" key for value of 0.

diff --git a/isamb/isamb.c b/isamb/isamb.c
index 9d4d400..116cd9b 100644 (file)
--- a/isamb/isamb.c
+++ b/isamb/isamb.c
@@ -1,4 +1,4 @@
-/* $Id: isamb.c,v 1.93 2007-04-03 16:54:46 adam Exp $
+/* $Id: isamb.c,v 1.94 2007-11-28 09:56:42 adam Exp $
    Copyright (C) 1995-2007
    Index Data ApS
 
@@ -969,14 +969,22 @@ int insert_leaf (ISAMB b, struct ISAMB_block **sp1, void *lookahead_item,
                     assert(*lookahead_mode);
                 }
             }
+            else if (d == 0 && *lookahead_mode == 2)
+            {
+                /* For mode == 2, we insert the new key anyway - even 
+                   though the comparison is 0. */
+                dst_item = lookahead_item;
+                p->dirty = 1;
+            }
             else
                 dst_item = file_item_buf;
 
-            if (!*lookahead_mode && d == 0)
+            if (d == 0 && !*lookahead_mode)
             {
-               /* it's a deletion and they match so there is nothing to be
-                  inserted anyway .. But mark the thing bad (file item
-                  was part of input.. The item will not be part of output */
+                /* it's a deletion and they match so there is nothing
+                   to be inserted anyway .. But mark the thing dirty
+                   (file item was part of input.. The item will not be
+                   part of output */
                 p->dirty = 1;
             }
             else if (!half1 && dst > mid_cut)
@@ -1414,7 +1422,7 @@ void isamb_pp_close (ISAMB_PP pp)
 
 /* simple recursive dumper .. */
 static void isamb_dump_r (ISAMB b, ISAM_P pos, void (*pr)(const char *str),
-                         int level)
+                          int level)
 {
     char buf[1024];
     char prefix_str[1024];