diff --git a/lib/vector.c b/lib/vector.c
new file mode 100644
index 0000000..31cdc77
--- /dev/null
+++ b/lib/vector.c
@@ -0,0 +1,189 @@
+/* Generic vector interface routine
+ * Copyright (C) 1997 Kunihiro Ishiguro
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * GNU Zebra is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Zebra; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.  
+ */
+
+#include <zebra.h>
+
+#include "vector.h"
+#include "memory.h"
+
+/* Initialize vector : allocate memory and return vector. */
+vector
+vector_init (unsigned int size)
+{
+  vector v = XCALLOC (MTYPE_VECTOR, sizeof (struct _vector));
+
+  /* allocate at least one slot */
+  if (size == 0)
+    size = 1;
+
+  v->alloced = size;
+  v->max = 0;
+  v->index = XCALLOC (MTYPE_VECTOR_INDEX, sizeof (void *) * size);
+  return v;
+}
+
+void
+vector_only_wrapper_free (vector v)
+{
+  XFREE (MTYPE_VECTOR, v);
+}
+
+void
+vector_only_index_free (void *index)
+{
+  XFREE (MTYPE_VECTOR_INDEX, index);
+}
+
+void
+vector_free (vector v)
+{
+  XFREE (MTYPE_VECTOR_INDEX, v->index);
+  XFREE (MTYPE_VECTOR, v);
+}
+
+vector
+vector_copy (vector v)
+{
+  unsigned int size;
+  vector new = XCALLOC (MTYPE_VECTOR, sizeof (struct _vector));
+
+  new->max = v->max;
+  new->alloced = v->alloced;
+
+  size = sizeof (void *) * (v->alloced);
+  new->index = XCALLOC (MTYPE_VECTOR_INDEX, size);
+  memcpy (new->index, v->index, size);
+
+  return new;
+}
+
+/* Check assigned index, and if it runs short double index pointer */
+void
+vector_ensure (vector v, unsigned int num)
+{
+  if (v->alloced > num)
+    return;
+
+  v->index = XREALLOC (MTYPE_VECTOR_INDEX, 
+		       v->index, sizeof (void *) * (v->alloced * 2));
+  memset (&v->index[v->alloced], 0, sizeof (void *) * v->alloced);
+  v->alloced *= 2;
+  
+  if (v->alloced <= num)
+    vector_ensure (v, num);
+}
+
+/* This function only returns next empty slot index.  It dose not mean
+   the slot's index memory is assigned, please call vector_ensure()
+   after calling this function. */
+int
+vector_empty_slot (vector v)
+{
+  unsigned int i;
+
+  if (v->max == 0)
+    return 0;
+
+  for (i = 0; i < v->max; i++)
+    if (v->index[i] == 0)
+      return i;
+
+  return i;
+}
+
+/* Set value to the smallest empty slot. */
+int
+vector_set (vector v, void *val)
+{
+  unsigned int i;
+
+  i = vector_empty_slot (v);
+  vector_ensure (v, i);
+
+  v->index[i] = val;
+
+  if (v->max <= i)
+    v->max = i + 1;
+
+  return i;
+}
+
+/* Set value to specified index slot. */
+int
+vector_set_index (vector v, unsigned int i, void *val)
+{
+  vector_ensure (v, i);
+
+  v->index[i] = val;
+
+  if (v->max <= i)
+    v->max = i + 1;
+
+  return i;
+}
+
+/* Look up vector.  */
+void *
+vector_lookup (vector v, unsigned int i)
+{
+  if (i >= v->max)
+    return NULL;
+  return v->index[i];
+}
+
+/* Lookup vector, ensure it. */
+void *
+vector_lookup_ensure (vector v, unsigned int i)
+{
+  vector_ensure (v, i);
+  return v->index[i];
+}
+
+/* Unset value at specified index slot. */
+void
+vector_unset (vector v, unsigned int i)
+{
+  if (i >= v->alloced)
+    return;
+
+  v->index[i] = NULL;
+
+  if (i + 1 == v->max) 
+    {
+      v->max--;
+      while (i && v->index[--i] == NULL && v->max--) 
+	;				/* Is this ugly ? */
+    }
+}
+
+/* Count the number of not emplty slot. */
+unsigned int
+vector_count (vector v)
+{
+  unsigned int i;
+  unsigned count = 0;
+
+  for (i = 0; i < v->max; i++) 
+    if (v->index[i] != NULL)
+      count++;
+
+  return count;
+}