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diff --git a/src/mds-kbdc/functions.h b/src/mds-kbdc/functions.h
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+/**
+ * mds — A micro-display server
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program 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 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef MDS_MDS_KBDC_FUNCTIONS_H
+#define MDS_MDS_KBDC_FUNCTIONS_H
+
+
+#include "string.h"
+
+#include <stddef.h>
+#include <stdarg.h>
+
+
+/**
+ * Check whether a function is defined.
+ * 
+ * @param   name       The name of the function.
+ * @param   arg_count  The number of arguments to pass to the function.
+ * @return             Whether the function is defined for the selected number of arguments.
+ */
+int function_check_defined(const char32_t* restrict name, size_t arg_count) __attribute__((nonnull));
+
+/**
+ * Invoke a function defined in the keyboard layout source code, or that is builtin.
+ * 
+ * @param   name           The name of the function.
+ * @param   arg_count      The number of arguments to pass to the function.
+ * @param   ...:char32_t*  The arguments to pass, do not end with a sentinel.
+ * @return                 The return value of the function, `NULL` on error.
+ */
+char32_t* function_invoke(const char32_t* restrict name, size_t arg_count, ...) __attribute__((nonnull));
+
+/* TODO define functions, check if function is built in */
+
+
+#endif
+