lib: Add B-tree implementation

Adds an implementation of B-trees of order k (k children, min fill is
k/2, max fill k - 1). Useful to implement indexes for faster lookups.

1 files changed, 46 insertions, 0 deletions

diff --git a/src/lib/btree.h b/src/lib/btree.h
new file mode 100644
index 00000000..79467099
--- /dev/null
+++ b/src/lib/btree.h
@@ -0,0 +1,46 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * B-trees
+ *
+ *    Dimitri Staessens <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef OUROBOROS_LIB_BTREE_H
+#define OUROBOROS_LIB_BTREE_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+struct btree;
+
+/* Create a B-tree of order k */
+struct btree * btree_create(size_t k);
+
+void           btree_destroy(struct btree * tree);
+
+int            btree_insert(struct btree * tree,
+                            uint32_t       key,
+                            void *         val);
+
+int            btree_remove(struct btree * tree,
+                            uint32_t       key);
+
+void *         btree_search(struct btree * tree,
+                            uint32_t       key);
+
+#endif /* OUROBOROS_LIB_BTREE_H */