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/* $Id: property.c 840 2007-09-09 12:17:42Z michael $
* $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/property.c $
*
* dynamic properties
*
* Copyright (C) 2006 Michael Reinelt <michael@reinelt.co.at>
* Copyright (C) 2006 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* 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.
*
*/
/*
* exported functions:
*
* void property_load (const char *section, const char *name, const char *defval, PROPERTY *prop)
* initializes and loads a property from the config file and pre-compiles it
*
* void property_free (PROPERTY *prop)
* frees all property allocations
*
* int property_eval(PROPERTY * prop)
* evaluates a property; returns 1 if value has changed
*
* double P2N(PROPERTY * prop)
* returns a (already evaluated) property as number
*
* char *P2S(PROPERTY * prop)
* returns a (already evaluated) property as string
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "debug.h"
#include "cfg.h"
#include "evaluator.h"
#include "property.h"
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif
void property_load(const char *section, const char *name, const char *defval, PROPERTY * prop)
{
char *expression;
/* initialize structure */
prop->valid = 0;
prop->name = NULL;
prop->expression = NULL;
prop->compiled = NULL;
DelResult(&prop->result);
/* remember the name */
prop->name = strdup(name);
/* load expression from config, but do not evaluate it */
expression = cfg_get_raw(section, name, NULL);
if (expression == NULL) {
if (defval != NULL && *defval != '\0')
debug("Notice: using default value <%s> for property '%s.%s'", defval, section, name);
prop->expression = (char *) defval;
} else {
prop->valid = 1;
prop->expression = expression;
}
/* pre-compile the expression */
Compile(prop->expression, &prop->compiled);
}
int property_valid(PROPERTY * prop)
{
return prop->valid;
}
int property_eval(PROPERTY * prop)
{
RESULT old;
int update;
/* this is a bit ugly: we need to remember the old value */
old.type = prop->result.type;
old.size = prop->result.size;
old.number = prop->result.number;
old.string = prop->result.string != NULL ? strdup(prop->result.string) : NULL;
DelResult(&prop->result);
Eval(prop->compiled, &prop->result);
/* check if property value has changed */
update = 1;
if (prop->result.type & R_NUMBER && old.type & R_NUMBER && prop->result.number == old.number) {
update = 0;
}
if (prop->result.type & R_STRING && old.type & R_STRING && prop->result.size == old.size) {
if (prop->result.string == NULL && old.string == NULL) {
update = 0;
} else if (prop->result.string != NULL && old.string != NULL && strcmp(prop->result.string, old.string) == 0) {
update = 0;
}
}
if (old.string)
free(old.string);
return update;
}
double P2N(PROPERTY * prop)
{
if (prop == NULL) {
error("Property: internal error: NULL property");
return 0.0;
}
return R2N(&prop->result);
}
char *P2S(PROPERTY * prop)
{
if (prop == NULL) {
error("Property: internal error: NULL property");
return NULL;
}
return R2S(&prop->result);
}
void property_free(PROPERTY * prop)
{
if (prop->name != NULL) {
free(prop->name);
prop->name = NULL;
}
if (prop->expression != NULL) {
/* do *not* free expression */
prop->expression = NULL;
}
if (prop->compiled != NULL) {
free(prop->compiled);
prop->compiled = NULL;
}
DelResult(&prop->result);
}
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