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/***************************************************************************
* __________ __ ___
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
*
* Copyright (C) 2014 by Ilia Sergachev: Initial Rockbox port to iBasso DX50
* Copyright (C) 2014 by Mario Basister: iBasso DX90 port
* Copyright (C) 2014 by Simon Rothen: Initial Rockbox repository submission, additional features
* Copyright (C) 2014 by Udo Schläpfer: Code clean up, additional features
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include <string.h>
#include "config.h"
#include "debug.h"
#include "sysfs.h"
static FILE* open_read(const char *file_name)
{
FILE *f = fopen(file_name, "r");
if(f == NULL)
{
DEBUGF("ERROR %s: Can not open %s for reading.", __func__, file_name);
}
return f;
}
static FILE* open_write(const char* file_name)
{
FILE *f = fopen(file_name, "w");
if(f == NULL)
{
DEBUGF("ERROR %s: Can not open %s for writing.", __func__, file_name);
}
return f;
}
bool sysfs_get_int(const char *path, int *value)
{
*value = -1;
FILE *f = open_read(path);
if(f == NULL)
{
return false;
}
bool success = true;
if(fscanf(f, "%d", value) == EOF)
{
DEBUGF("ERROR %s: Read failed for %s.", __func__, path);
success = false;
}
fclose(f);
return success;
}
bool sysfs_set_int(const char *path, int value)
{
FILE *f = open_write(path);
if(f == NULL)
{
return false;
}
bool success = true;
if(fprintf(f, "%d", value) < 0)
{
DEBUGF("ERROR %s: Write failed for %s.", __func__, path);
success = false;
}
fclose(f);
return success;
}
bool sysfs_get_char(const char *path, char *value)
{
int c;
FILE *f = open_read(path);
if(f == NULL)
{
return false;
}
bool success = true;
c = fgetc(f);
if(c == EOF)
{
DEBUGF("ERROR %s: Read failed for %s.", __func__, path);
success = false;
}
else
{
*value = c;
}
fclose(f);
return success;
}
bool sysfs_set_char(const char *path, char value)
{
FILE *f = open_write(path);
if(f == NULL)
{
return false;
}
bool success = true;
if(fprintf(f, "%c", value) < 1)
{
DEBUGF("ERROR %s: Write failed for %s.", __func__, path);
success = false;
}
fclose(f);
return success;
}
bool sysfs_get_string(const char *path, char *value, int size)
{
value[0] = '\0';
FILE *f = open_read(path);
if(f == NULL)
{
return false;
}
bool success = true;
/* fgets returns NULL if en error occured OR
* when EOF occurs while no characters have been read.
*
* Empty string is not an error for us.
*/
if(fgets(value, size, f) == NULL && value[0] != '\0')
{
DEBUGF("ERROR %s: Read failed for %s.", __func__, path);
success = false;
}
else
{
size_t length = strlen(value);
if((length > 0) && value[length - 1] == '\n')
{
value[length - 1] = '\0';
}
}
fclose(f);
return success;
}
bool sysfs_set_string(const char *path, char *value)
{
FILE *f = open_write(path);
if(f == NULL)
{
return false;
}
bool success = true;
/* If an output error is encountered, a negative value is returned */
if(fprintf(f, "%s", value) < 0)
{
DEBUGF("ERROR %s: Write failed for %s.", __func__, path);
success = false;
}
fclose(f);
return success;
}
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