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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 */