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diff --git a/src/mds-kbdc/builtin-functions.h b/src/mds-kbdc/builtin-functions.h
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+++ b/src/mds-kbdc/builtin-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_BUILTIN_FUNCTIONS_H
+#define MDS_MDS_KBDC_BUILTIN_FUNCTIONS_H
+
+
+#include "string.h"
+
+#include <stddef.h>
+#include <stdarg.h>
+
+
+
+/**
+ * Check whether a function is a builtin function
+ * 
+ * @param   name       The name of the function
+ * @param   arg_count  The number of arguments to pass to the function
+ * @return             Whether the described function is a builtin function
+ */
+int builtin_function_defined(const char* restrict name, size_t arg_count) __attribute__((pure));
+
+/**
+ * Invoke a builtin function
+ * 
+ * @param   name       The name of the function
+ * @param   arg_count  The number of arguments to pass to the function
+ * @param   args       The arguments to pass
+ * @return             The return value of the function, `NULL` on error
+ */
+char32_t* builtin_function_invoke(const char* restrict name, size_t arg_count, const char32_t** restrict args);
+
+
+
+#endif
+