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/* $Id: expr.c,v 1.2 2004/01/09 04:16:06 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 1.2 2004/01/09 04:16:06 reinelt
* added 'section' argument to cfg_get(), but NULLed it on all calls by now.
*
* 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(NULL, 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(NULL, yn, "100"));
sprintf(yn, "Min_y%d", index);
min = atof(cfg_get(NULL, yn, "0"));
if (max != min)
*val = (*val - min)/(max - min);
}
return 0;
}
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