diff --git a/src/vty/vector.c b/src/vty/vector.c
new file mode 100644
index 0000000..7687010
--- /dev/null
+++ b/src/vty/vector.c
@@ -0,0 +1,186 @@
+/* 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 <stdlib.h>
+#include <unistd.h>
+
+#include <vty/vector.h>
+#include <memory.h>
+
+/* Initialize vector : allocate memory and return vector. */
+vector vector_init(unsigned int size)
+{
+	vector v = calloc(1, sizeof(struct _vector));
+	if (!v)
+		return NULL;
+
+	/* allocate at least one slot */
+	if (size == 0)
+		size = 1;
+
+	v->alloced = size;
+	v->active = 0;
+	v->index = calloc(1, sizeof(void *) * size);
+	if (!v->index) {
+		free(v);
+		return NULL;
+	}
+	return v;
+}
+
+void vector_only_wrapper_free(vector v)
+{
+	free(v);
+}
+
+void vector_only_index_free(void *index)
+{
+	free(index);
+}
+
+void vector_free(vector v)
+{
+	free(v->index);
+	free(v);
+}
+
+vector vector_copy(vector v)
+{
+	unsigned int size;
+	vector new = calloc(1, sizeof(struct _vector));
+	if (!new)
+		return NULL;
+
+	new->active = v->active;
+	new->alloced = v->alloced;
+
+	size = sizeof(void *) * (v->alloced);
+	new->index = calloc(1, size);
+	if (!new->index) {
+		free(new);
+		return NULL;
+	}
+	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 = realloc(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->active == 0)
+		return 0;
+
+	for (i = 0; i < v->active; 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->active <= i)
+		v->active = 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->active <= i)
+		v->active = i + 1;
+
+	return i;
+}
+
+/* Look up vector.  */
+void *vector_lookup(vector v, unsigned int i)
+{
+	if (i >= v->active)
+		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->active) {
+		v->active--;
+		while (i && v->index[--i] == NULL && v->active--) ;	/* 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->active; i++)
+		if (v->index[i] != NULL)
+			count++;
+
+	return count;
+}