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/*
* Power debug tool (powerdebug)
*
* Copyright (C) 2016, Linaro Limited.
*
* 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.
*
*/
#define _GNU_SOURCE
#include <stdio.h>
#undef _GNU_SOURCE
#include <stdlib.h>
/*
* This functions is a helper to read a specific file content and store
* the content inside a variable pointer passed as parameter, the format
* parameter gives the variable type to be read from the file.
*
* @path : directory path containing the file
* @name : name of the file to be read
* @format : the format of the format
* @value : a pointer to a variable to store the content of the file
* Returns 0 on success, -1 otherwise
*/
int file_read_value(const char *path, const char *name,
const char *format, void *value)
{
FILE *file;
char *rpath;
int ret;
ret = asprintf(&rpath, "%s/%s", path, name);
if (ret < 0)
return ret;
file = fopen(rpath, "r");
if (!file) {
ret = -1;
goto out_free;
}
ret = fscanf(file, format, value) == EOF ? -1 : 0;
fclose(file);
out_free:
free(rpath);
return ret;
}
/*
* This functions is a helper to write a specific file content and store
* the content inside a variable pointer passed as parameter, the format
* parameter gives the variable type to be write to the file.
*
* @path : directory path containing the file
* @name : name of the file to be read
* @format : the format of the format
* @value : a pointer to a variable to store the content of the file
* Returns 0 on success, -1 otherwise
*/
int file_write_value(const char *path, const char *name,
const char *format, void *value)
{
FILE *file;
char *rpath;
int ret;
ret = asprintf(&rpath, "%s/%s", path, name);
if (ret < 0)
return ret;
file = fopen(rpath, "w");
if (!file) {
ret = -1;
goto out_free;
}
ret = fprintf(file, format, value) < 0 ? -1 : 0;
fclose(file);
out_free:
free(rpath);
return ret;
}
int file_open(FILE **fp, const char *path, const char *name, const char *format)
{
int ret;
char *rpath;
ret = asprintf(&rpath, "%s/%s", path, name);
if (ret < 0)
return ret;
ret = 0;
*fp = fopen(rpath, format);
if (!(*fp))
ret = -1;
free(rpath);
return ret;
}
int file_read_line(FILE **fp, char *line, int size)
{
if (!(*fp))
return -1;
if (fgets(line, size, *fp) != NULL)
return 0;
else
return -1;
}
int file_close(FILE **fp)
{
if (!(*fp))
return -1;
fclose(*fp);
return 0;
}
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