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/*
* device-node
*
* Copyright (c) 2015 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the License);
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#define BUF_MAX 255
static int sys_read_buf(char *file, char *buf, int len)
{
int fd, r;
if (!file || !buf || len < 0)
return -EINVAL;
fd = open(file, O_RDONLY);
if (fd == -1)
return -ENOENT;
r = read(fd, buf, len);
close(fd);
if ((r >= 0) && (r < len))
buf[r] = '\0';
else
return -EIO;
return 0;
}
static int sys_write_buf(char *file, char *buf)
{
int fd, r;
if (!file || !buf)
return -EINVAL;
fd = open(file, O_WRONLY);
if (fd == -1)
return -EPERM;
r = write(fd, buf, strlen(buf));
close(fd);
if (r < 0)
return -EIO;
return 0;
}
int sys_get_int(char *fname, int *val)
{
char buf[BUF_MAX];
int r;
if (!fname || !val)
return -EINVAL;
r = sys_read_buf(fname, buf, sizeof(buf));
if (r < 0)
return r;
*val = atoi(buf);
return 0;
}
int sys_get_str(char *fname, char *str, int len)
{
int r;
if (!fname || !str || len < 0)
return -EINVAL;
r = sys_read_buf(fname, str, len);
if (r < 0)
return r;
return 0;
}
int sys_set_int(char *fname, int val)
{
char buf[BUF_MAX];
int r;
if (!fname)
return -EINVAL;
snprintf(buf, sizeof(buf), "%d", val);
r = sys_write_buf(fname, buf);
if (r < 0)
return r;
return 0;
}
int sys_set_str(char *fname, char *val)
{
int r;
if (!fname || !val)
return -EINVAL;
r = sys_write_buf(fname, val);
if (r < 0)
return r;
return 0;
}
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