diff options
Diffstat (limited to 'expr.h')
| -rw-r--r-- | expr.h | 59 |
1 files changed, 59 insertions, 0 deletions
@@ -0,0 +1,59 @@ +/* + 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 */ |