--- /dev/null
+/*
+ * This file is part of RRDtool.
+ *
+ * RRDtool 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 of the License, or
+ * (at your option) any later version.
+ *
+ * RRDtool 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 Foobar; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*****************************************************************************
+ * RRDtool 1.0.37 Copyright Tobias Oetiker, 1997 - 2000
+ *****************************************************************************
+ * rrd_tool.h Common Header File
+ *****************************************************************************
+ * Id: rrd_tool.h,v 1.1.1.1 2002/02/26 10:21:37 oetiker Exp
+ * Log: rrd_tool.h,v
+ * Revision 1.1.1.1 2002/02/26 10:21:37 oetiker
+ * Intial Import
+ *
+ *****************************************************************************/
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef _RRD_EXTRA_H
+#define _RRD_EXTRA_H
+
+#include "rrd_format.h"
+
+#ifndef WIN32
+#ifndef isnan /* POSIX */
+int isnan(double value);
+#endif
+#else /* Windows only */
+#include <float.h>
+#define isnan _isnan
+#endif
+
+void rrd_free(rrd_t *rrd);
+void rrd_init(rrd_t *rrd);
+
+int rrd_open(char *file_name, FILE **in_file, rrd_t *rrd, int rdwr);
+int readfile(char *file, char **buffer, int skipfirst);
+
+#define RRD_READONLY 0
+#define RRD_READWRITE 1
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif