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/*
Copyright (C) 2021 Srivats P.
This file is part of "Ostinato"
This 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 3 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, see <http://www.gnu.org/licenses/>
*/
#include "linuxutils.h"
#include <QFile>
#include <QTextStream>
// Reads a text file (size < 4K) and returns content as a string
// A terminating \n will be removed
// There's no way to distinguish an empty file and error while reading
QString readTextFile(QString fileName)
{
QFile file(fileName);
if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
qWarning("Can't read %s", qUtf8Printable(fileName));
return QString();
}
if (file.size() > 4096) {
qWarning("Can't read %s - too large (%lld)",
qUtf8Printable(fileName), file.size());
return QString();
}
QTextStream in(&file);
QString text = in.readAll();
file.close();
if (text.endsWith('\n'))
text.chop(1);
return text;
}
// Reads value from /sys/class/net/<device>/<attrib-path>
// and returns as string
// XXX: reading from sysfs is discouraged
QString sysfsAttrib(const char *device, const char *attribPath)
{
return readTextFile(QString("/sys/class/net/%1/%2")
.arg(device).arg(attribPath));
}
// Convenience overload
QString sysfsAttrib(QString device, const char *attribPath)
{
return sysfsAttrib(qPrintable(device), attribPath);
}
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