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 #include &quot;textprogressbar.h&quot;
 #include &lt;QByteArray&gt;
 #include &lt;stdio.h&gt;

 TextProgressBar::TextProgressBar()
     : value(0), maximum(-1), iteration(0)
 {
 }

 void TextProgressBar::clear()
 {
     printf(&quot;\n&quot;);
     fflush(stdout);

     iteration = 0;
     value = 0;
     maximum = -1;
 }

 void TextProgressBar::update()
 {
     ++iteration;

     if (maximum &gt; 0) {
         <span class="comment">// we know the maximum</span>
         <span class="comment">// draw a progress bar</span>
         int percent = value * 100 / maximum;
         int hashes = percent / 2;

         QByteArray progressbar(hashes, '#');
         if (percent % 2)
             progressbar += '&gt;';

         printf(&quot;\r[%-50s] %3d%% %s     &quot;,
                progressbar.constData(),
                percent,
                qPrintable(message));
     } else {
         <span class="comment">// we don't know the maximum, so we can't draw a progress bar</span>
         int center = (iteration % 48) + 1; <span class="comment">// 50 spaces, minus 2</span>
         QByteArray before(qMax(center - 2, 0), ' ');
         QByteArray after(qMin(center + 2, 50), ' ');

         printf(&quot;\r[%s###%s]      %s      &quot;,
                before.constData(), after.constData(), qPrintable(message));
     }
 }

 void TextProgressBar::setMessage(const QString &amp;m)
 {
     message = m;
 }

 void TextProgressBar::setStatus(qint64 val, qint64 max)
 {
     value = val;
     maximum = max;
 }</pre>
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