1 files changed, 61 insertions, 0 deletions
diff --git a/hicn-light/src/hicn/config/command.c b/hicn-light/src/hicn/config/command.c
new file mode 100644
index 000000000..4c89d6680
--- /dev/null
+++ b/hicn-light/src/hicn/config/command.c
@@ -0,0 +1,61 @@
+
+/**
+ * @file command.c
+ * @brief Implementation of commands.
+ */
+
+#include <search.h> /* tfind, tdestroy, twalk */
+#include <stdio.h>
+
+#include "command.h"
+
+/* Commands are registered in the following tree. */
+static void * commands_root    = NULL;  /**< Tree ordered by name */
+
+static void nothing_to_free() {}
+
+#ifdef __linux__
+__attribute__((destructor))
+static
+void
+command_clear()
+{
+    tdestroy(commands_root, nothing_to_free);
+}
+#endif /* __linux__ */
+
+static
+int
+_command_compare(const command_parser_t * c1,
+        const command_parser_t * c2)
+{
+    if (c1->action != c2->action)
+        return c2->action - c1->action;
+    if (c1->object != c2->object)
+        return c2->object - c1->object;
+    if (c1->nparams != c2->nparams)
+        return c2->nparams - c1->nparams;
+    return 0;
+}
+
+#define command_compare (int (*)(const void *, const void *))(_command_compare)
+
+void
+command_register(const command_parser_t * command)
+{
+    // Insert the command in the tree if the keys does not exist yet
+    tsearch(command, &commands_root, command_compare);
+}
+
+const command_parser_t *
+command_search(hc_action_t action, hc_object_type_t object, unsigned nparams)
+{
+    command_parser_t ** command, search;
+
+    search.action = action;
+    search.object = object;
+    search.nparams = nparams;
+    command = tfind(&search, &commands_root, command_compare);
+
+    return command ? *command : NULL;
+}