se-Suijavaara « dvb-t - dtv-scan-tables.git - Digital TV scan tables

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# Sweden - Suijavaara
[CHANNEL]
	DELIVERY_SYSTEM = DVBT
	FREQUENCY = 634000000
	BANDWIDTH_HZ = 8000000

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/* $Id$
 * $URL$
 *
 * 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);
}