root/lm-sensors/branches/lm-sensors-3.0.0/lib/init.c @ 5169

/*
    init.c - Part of libsensors, a Linux library for reading sensor data.
    Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>
    Copyright (C) 2007        Jean Delvare <khali@linux-fr.org>

    This program 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 of the License, or
    (at your option) any later version.

    This program 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., 51 Franklin Street, Fifth Floor, Boston,
    MA 02110-1301 USA.
*/

#include <locale.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "sensors.h"
#include "data.h"
#include "error.h"
#include "access.h"
#include "conf.h"
#include "sysfs.h"
#include "scanner.h"
#include "init.h"

#define DEFAULT_CONFIG_FILE     ETCDIR "/sensors3.conf"
#define ALT_CONFIG_FILE         ETCDIR "/sensors.conf"

/* Wrapper around sensors_yyparse(), which clears the locale so that
   the decimal numbers are always parsed properly. */
static int sensors_parse(void)
{
        int res;
        char *locale;

        /* Remember the current locale and clear it */
        locale = setlocale(LC_ALL, NULL);
        if (locale) {
                locale = strdup(locale);
                setlocale(LC_ALL, "C");
        }

        res = sensors_yyparse();

        /* Restore the old locale */
        if (locale) {
                setlocale(LC_ALL, locale);
                free(locale);
        }

        return res;
}

int sensors_init(FILE *input)
{
        int res;

        if (!sensors_init_sysfs())
                return -SENSORS_ERR_KERNEL;
        if ((res = sensors_read_sysfs_bus()) ||
            (res = sensors_read_sysfs_chips()))
                goto exit_cleanup;

        res = -SENSORS_ERR_PARSE;
        if (input) {
                if (sensors_scanner_init(input) ||
                    sensors_parse())
                        goto exit_cleanup;
        } else {
                /* No configuration provided, use default */
                input = fopen(DEFAULT_CONFIG_FILE, "r");
                if (!input && errno == ENOENT)
                        input = fopen(ALT_CONFIG_FILE, "r");
                if (input) {
                        if (sensors_scanner_init(input) ||
                            sensors_parse()) {
                                fclose(input);
                                goto exit_cleanup;
                        }
                        fclose(input);
                }
        }

        if ((res = sensors_substitute_busses()))
                goto exit_cleanup;
        return 0;

exit_cleanup:
        sensors_cleanup();
        return res;
}

static void free_chip_name(sensors_chip_name *name)
{
        free(name->prefix);
        free(name->path);
}

static void free_chip_features(sensors_chip_features *features)
{
        int i;

        for (i = 0; i < features->subfeature_count; i++)
                free(features->subfeature[i].name);
        free(features->subfeature);
        for (i = 0; i < features->feature_count; i++)
                free(features->feature[i].name);
        free(features->feature);
}

static void free_bus(sensors_bus *bus)
{
        free(bus->adapter);
}

static void free_label(sensors_label *label)
{
        free(label->name);
        free(label->value);
}

void free_expr(sensors_expr *expr)
{
        if (expr->kind == sensors_kind_var)
                free(expr->data.var);
        else if (expr->kind == sensors_kind_sub) {
                if (expr->data.subexpr.sub1)
                        free_expr(expr->data.subexpr.sub1);
                if (expr->data.subexpr.sub2)
                        free_expr(expr->data.subexpr.sub2);
        }
        free(expr);
}

static void free_set(sensors_set *set)
{
        free(set->name);
        free_expr(set->value);
}

static void free_compute(sensors_compute *compute)
{
        free(compute->name);
        free_expr(compute->from_proc);
        free_expr(compute->to_proc);
}

static void free_ignore(sensors_ignore *ignore)
{
        free(ignore->name);
}

static void free_chip(sensors_chip *chip)
{
        int i;

        for (i = 0; i < chip->chips.fits_count; i++)
                free_chip_name(&chip->chips.fits[i]);
        free(chip->chips.fits);
        chip->chips.fits_count = chip->chips.fits_max = 0;

        for (i = 0; i < chip->labels_count; i++)
                free_label(&chip->labels[i]);
        free(chip->labels);
        chip->labels_count = chip->labels_max = 0;

        for (i = 0; i < chip->sets_count; i++)
                free_set(&chip->sets[i]);
        free(chip->sets);
        chip->sets_count = chip->sets_max = 0;

        for (i = 0; i < chip->computes_count; i++)
                free_compute(&chip->computes[i]);
        free(chip->computes);
        chip->computes_count = chip->computes_max = 0;

        for (i = 0; i < chip->ignores_count; i++)
                free_ignore(&chip->ignores[i]);
        free(chip->ignores);
        chip->ignores_count = chip->ignores_max = 0;
}

void sensors_cleanup(void)
{
        int i;

        sensors_scanner_exit();

        for (i = 0; i < sensors_proc_chips_count; i++) {
                free_chip_name(&sensors_proc_chips[i].chip);
                free_chip_features(&sensors_proc_chips[i]);
        }
        free(sensors_proc_chips);
        sensors_proc_chips = NULL;
        sensors_proc_chips_count = sensors_proc_chips_max = 0;

        for (i = 0; i < sensors_config_busses_count; i++)
                free_bus(&sensors_config_busses[i]);
        free(sensors_config_busses);
        sensors_config_busses = NULL;
        sensors_config_busses_count = sensors_config_busses_max = 0;

        for (i = 0; i < sensors_config_chips_count; i++)
                free_chip(&sensors_config_chips[i]);
        free(sensors_config_chips);
        sensors_config_chips = NULL;
        sensors_config_chips_count = sensors_config_chips_max = 0;

        for (i = 0; i < sensors_proc_bus_count; i++)
                free_bus(&sensors_proc_bus[i]);
        free(sensors_proc_bus);
        sensors_proc_bus = NULL;
        sensors_proc_bus_count = sensors_proc_bus_max = 0;
}