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+/*
+    expr - Simple, expression evaluator
+
+    Copyright (C) 2003  Ian Cowburn (ianc@noddybox.demon.co.uk)
+
+    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 2 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, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    -------------------------------------------------------------------------
+
+    This is a simple expression evaluator, supporting user supplied variables.
+
+    It works on longs, but a floating point version would be easy enough to
+    generate from this.
+
+    NB: THIS CODE IS NOT THREAD SAFE
+*/
+
+#ifndef EXPR_H
+#define EXPR_H "$Id$"
+
+/* ---------------------------------------- INTERFACES
+*/
+
+/* Returns the result of expr and stores the answer in result.
+   Returns FALSE on error.
+
+   If expand_var is not NULL then unrecognised strings of characters
+   (basically anything that gives strtol() problems) are passed to that
+   to expand the value.  The return of this routine should be TRUE if the
+   value was expanded into value.  The client_data pointer is passed to
+   expand_var().
+*/
+int		ExprEval(const char *expr, long *result,
+			 int (*expand_var)(void *client_data,
+			 		   const char *p,
+					   long *value),
+			 void *client_data);
+
+
+/* Gets a readable reason for an error from ExprEval() or ExprParse.
+*/
+const char	*ExprError(void);
+
+
+#endif
+
+/* END OF FILE */