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diff --git a/libraries/libmdb/mtest5.c b/libraries/libmdb/mtest5.c
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+/* mtest5.c - memory-mapped database tester/toy */
+/*
+ * Copyright 2011 Howard Chu, Symas Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+
+/* Tests for sorted duplicate DBs using cursor_put */
+#define _XOPEN_SOURCE 500              /* srandom(), random() */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include "mdb.h"
+
+int main(int argc,char * argv[])
+{
+       int i = 0, j = 0, rc;
+       MDB_env *env;
+       MDB_dbi dbi;
+       MDB_val key, data;
+       MDB_txn *txn;
+       MDB_stat mst;
+       MDB_cursor *cursor;
+       int count;
+       int *values;
+       char sval[32];
+       char kval[sizeof(int)];
+
+       srandom(time(NULL));
+
+       memset(sval, 0, sizeof(sval));
+
+       count = (random()%384) + 64;
+       values = (int *)malloc(count*sizeof(int));
+
+       for(i = 0;i<count;i++) {
+               values[i] = random()%1024;
+       }
+
+       rc = mdb_env_create(&env);
+       rc = mdb_env_set_mapsize(env, 10485760);
+       rc = mdb_env_set_maxdbs(env, 4);
+       rc = mdb_env_open(env, "./testdb", MDB_FIXEDMAP|MDB_NOSYNC, 0664);
+       rc = mdb_txn_begin(env, 0, &txn);
+       rc = mdb_open(txn, "id2", MDB_CREATE|MDB_DUPSORT, &dbi);
+       rc = mdb_cursor_open(txn, dbi, &cursor);
+
+       key.mv_size = sizeof(int);
+       key.mv_data = kval;
+       data.mv_size = sizeof(sval);
+       data.mv_data = sval;
+
+       printf("Adding %d values\n", count);
+       for (i=0;i<count;i++) {
+               if (!(i & 0x0f))
+                       sprintf(kval, "%03x", values[i]);
+               sprintf(sval, "%03x %d foo bar", values[i], values[i]);
+               rc = mdb_cursor_put(cursor, &key, &data, MDB_NODUPDATA);
+               if (rc) j++;
+       }
+       if (j) printf("%d duplicates skipped\n", j);
+       mdb_cursor_close(cursor);
+       rc = mdb_txn_commit(txn);
+       rc = mdb_env_stat(env, &mst);
+
+       rc = mdb_txn_begin(env, 1, &txn);
+       rc = mdb_cursor_open(txn, dbi, &cursor);
+       while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
+               printf("key: %p %.*s, data: %p %.*s\n",
+                       key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
+                       data.mv_data, (int) data.mv_size, (char *) data.mv_data);
+       }
+       mdb_cursor_close(cursor);
+       mdb_txn_abort(txn);
+
+       j=0;
+
+       for (i= count - 1; i > -1; i-= (random()%5)) {
+               j++;
+               txn=NULL;
+               rc = mdb_txn_begin(env, 0, &txn);
+               sprintf(kval, "%03x", values[i & ~0x0f]);
+               sprintf(sval, "%03x %d foo bar", values[i], values[i]);
+               key.mv_size = sizeof(int);
+               key.mv_data = kval;
+               data.mv_size = sizeof(sval);
+               data.mv_data = sval;
+               rc = mdb_del(txn, dbi, &key, &data);
+               if (rc) {
+                       j--;
+                       mdb_txn_abort(txn);
+               } else {
+                       rc = mdb_txn_commit(txn);
+               }
+       }
+       free(values);
+       printf("Deleted %d values\n", j);
+
+       rc = mdb_env_stat(env, &mst);
+       rc = mdb_txn_begin(env, 1, &txn);
+       rc = mdb_cursor_open(txn, dbi, &cursor);
+       printf("Cursor next\n");
+       while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
+               printf("key: %.*s, data: %.*s\n",
+                       (int) key.mv_size,  (char *) key.mv_data,
+                       (int) data.mv_size, (char *) data.mv_data);
+       }
+       printf("Cursor prev\n");
+       while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_PREV)) == 0) {
+               printf("key: %.*s, data: %.*s\n",
+                       (int) key.mv_size,  (char *) key.mv_data,
+                       (int) data.mv_size, (char *) data.mv_data);
+       }
+       mdb_cursor_close(cursor);
+       mdb_close(txn, dbi);
+
+       mdb_txn_abort(txn);
+       mdb_env_close(env);
+
+       return 0;
+}