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authorreinelt <reinelt@3ae390bd-cb1e-0410-b409-cd5a39f66f1f>2005-05-13 05:43:32 +0000
committerreinelt <reinelt@3ae390bd-cb1e-0410-b409-cd5a39f66f1f>2005-05-13 05:43:32 +0000
commit992d87d90bea7c457f8434a28be1ce7807b7b974 (patch)
treeb5928ed6bfbe6e904499e42b3bfad355a1861eb0 /debian/copyright
parent22b2fbf2b468991184a03a67a92f370c62cd514f (diff)
downloadlcd4linux-992d87d90bea7c457f8434a28be1ce7807b7b974.tar.gz
[lcd4linux @ 2005-05-13 05:43:25 by reinelt]
added drv_LCDLinux.h to extra_sources git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@552 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.3 (git 2.39.1) at 2026-11-07 11:37:49 +0000
30' href='#n130'>130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 
/* $Id$
 * $URL$
 *
 * 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);
}