Index: common/include/types/adt/odict.h
===================================================================
--- common/include/types/adt/odict.h	(revision 9f2f5eef7293f0126e93c9ba1905f6fc156afa9d)
+++ common/include/types/adt/odict.h	(revision 9f2f5eef7293f0126e93c9ba1905f6fc156afa9d)
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2016 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup kernel_generic_adt
+ * @{
+ */
+/** @file
+ */
+
+#ifndef _LIBC_TYPES_ODICT_H_
+#define _LIBC_TYPES_ODICT_H_
+
+#include <adt/list.h>
+
+typedef struct odlink odlink_t;
+typedef struct odict odict_t;
+
+typedef void *(*odgetkey_t)(odlink_t *);
+typedef int (*odcmp_t)(void *, void *);
+
+typedef enum {
+	odc_black,
+	odc_red
+} odict_color_t;
+
+typedef enum {
+	/** Child A */
+	odcs_a,
+	/** Child B */
+	odcs_b
+} odict_child_sel_t;
+
+/** Ordered dictionary link */
+struct odlink {
+	/** Containing dictionary */
+	odict_t *odict;
+	/** Parent node */
+	odlink_t *up;
+	/** First child */
+	odlink_t *a;
+	/** Second child */
+	odlink_t *b;
+	/** Node color */
+	odict_color_t color;
+	/** Link to odict->entries */
+	link_t lentries;
+};
+
+/** Ordered dictionary */
+struct odict {
+	/** Root of the tree */
+	odlink_t *root;
+	/** List of entries in ascending order */
+	list_t entries;
+	/** Get key operation */
+	odgetkey_t getkey;
+	/** Compare operation */
+	odcmp_t cmp;
+};
+
+#endif
+
+/** @}
+ */