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Diffstat (limited to '')
-rw-r--r-- | expr.c | 84 |
1 files changed, 84 insertions, 0 deletions
@@ -0,0 +1,84 @@ +/* $Id: expr.c,v 1.1 2004/01/05 11:57:38 reinelt Exp $ + * + * expr ('y*') functions + * This is only a workaround to make the Evaluator usable until + * it's fully integrated into lcd4linux. + * + * Copyright 2004 Michael Reinelt <reinelt@eunet.at> + * + * 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. + * + * + * $Log: expr.c,v $ + * Revision 1.1 2004/01/05 11:57:38 reinelt + * added %y tokens to make the Evaluator useable + * + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <time.h> +#include <ctype.h> +#include <errno.h> +#define IN_EXPR +#include "expr.h" +#include "plugin.h" +#include "debug.h" +#include "cfg.h" + + +int Expr(int index, char result[EXPR_TXT_LEN], double *val) +{ + RESULT Result = {0, 0.0, NULL}; + static int errs[EXPRS+1]; + char *expression; + char yn[4]; + + if (index < 0 || index > EXPRS) + return -1; + + if (errs[index]) + return -1; + + sprintf(yn, "y%d", index); + expression = cfg_get(yn,NULL); + + if (!expression || !*expression) { + error("Empty expression for 'y%d'", index); + errs[index]++; + return -1; + } + + Eval(expression, &Result); + strcpy(result, R2S(&Result)); + + debug("%s: <%s> = '%s'",yn, expression, result); + + if (isdigit(*result)) { + double max, min; + *val = atof(result); + sprintf(yn, "Max_y%d", index); + max = atof(cfg_get(yn,"100")); + sprintf(yn, "Min_y%d", index); + min = atof(cfg_get(yn,"0")); + if (max != min) + *val = (*val - min)/(max - min); + } + return 0; +} + |