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+/* $Id: evaluator.h 1092 2010-01-23 12:04:55Z volker $
+ * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/evaluator.h $
+ *
+ * expression evaluation
+ *
+ * Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.at>
+ * Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
+ *
+ * This file is part of LCD4Linux.
+ *
+ * LCD4Linux 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 2, or (at your option)
+ * any later version.
+ *
+ * LCD4Linux 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+
+#ifndef _EVALUATOR_H_
+#define _EVALUATOR_H_
+
+
+/* RESULT bitmask */
+#define R_NUMBER 1
+#define R_STRING 2
+
+typedef struct {
+    int type;
+    int size;
+    double number;
+    char *string;
+} RESULT;
+
+/* strndup() may be not available on several platforms */
+#ifndef HAVE_STRNDUP
+#include <string.h>
+char *strndup(const char *source, size_t len);
+#endif
+
+int SetVariable(const char *name, RESULT * value);
+int SetVariableNumeric(const char *name, const double value);
+int SetVariableString(const char *name, const char *value);
+
+int AddFunction(const char *name, const int argc, void (*func) ());
+
+void DeleteVariables(void);
+void DeleteFunctions(void);
+
+void DelResult(RESULT * result);
+RESULT *SetResult(RESULT ** result, const int type, const void *value);
+RESULT *CopyResult(RESULT ** result, RESULT * value);
+
+double R2N(RESULT * result);
+char *R2S(RESULT * result);
+
+int Compile(const char *expression, void **tree);
+int Eval(void *tree, RESULT * result);
+void DelTree(void *tree);
+
+#endif