Uptime.cpp

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/* 
 * Confdump-Agent - Dump static and runtime system configuration
 * Copyright (C) 2009-2012  Straton IT, SAS
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 as
 * published by the Free Software Foundation.
 * 
 * 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 "Confdump/System/LinuxDumper.hpp"
#include "Confdump/System/Linux/Uptime.hpp"

using boost::shared_ptr;

namespace Confdump
{

namespace System
{

namespace Linux
{

Uptime::Uptime( quint64 millisecondsUptime )
 : millisecondsUptime_( millisecondsUptime )
{
}

Uptime::~Uptime()
{
}

/* The custom parsing done below will preserve precision, unlike any floating
 * type and without requiring any "big number" library.
 */
Result Uptime::uptime( boost::shared_ptr<LinuxDumper> driver )
{
    QByteArray contents = driver->systemContext().slurpConfigurationFile( boost::filesystem::path( "/proc/uptime" ), "CD_Uptime" );
    QString rawUptime = QString::fromLocal8Bit( contents );

    Result entries;
    QRegExp firstDecimal( "^(\\d+)\\.(\\d{1,3})" );
    if ( firstDecimal.indexIn( rawUptime ) != -1 )
    {
        QString integer = firstDecimal.cap( 1 );
        QString decimals = firstDecimal.cap( 2 ).leftJustified( 3, '0' );
        quint64 uptime = integer.toULongLong() * 1000 + decimals.toULongLong();
        entries.push_back( shared_ptr<Uptime>( new Uptime( uptime ) ) );
    }

    return entries;
}

} // ns Linux
} // ns System
} // ns Confdump