defaria.com/blogs/Status/2007/09/ucmwb-su-bug.html

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  70                   <h2 itemprop="name" class="asset-name entry-title">UCMWB su bug</h2>
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  73                       <li class="asset-meta-list-item">Posted on <time datetime="2007-09-13T11:28:07-08:00" itemprop="datePublished">September 13, 2007</time></li>
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  84                   <ul>
  85   <li>Fixed an issue with ucmwb running after su'ed to another user</li>
  86
  87   <li>Addressed some issues about PC running CC in the RAN network</li>
  88 </ul>
  89                   <h3>Stupid coding</h3>
  90
  91 <p>It never ceases to amaze me what some programmers do that when I look at it seem to be just foolish things. Here's today's example:</p>
  92
  93 <p>In ucmwb a bug was discovered when a user first su's to some other user then runs ucmwb (in this case the user is su'ing to ccadm). The while the main window dutifully displays the list of WORs for the su'ed user, the view browser does not. Instead it displays the list of views for the original user. Turns out that there was specific code for Solaris to call cuserid instead of getenv("USER"). So Linux was working but Solaris failed. Why the difference?</p>
  94
  95 <p>But along with that I noticed the following code:</p>
  96
  97 <div class=code><pre>
  98     QSting homePath = QDir::homePath();
  99
 100     if (homePath.isEmpty()) {
 101       qDebug() << "homePath is empty!";
 102       // Note the following is a Unix'ism and non portable!
 103       homePath = QString("/home/") + appUsername;
 104     }
 105
 106     qDebug() << "homePath = " << homePath;
 107     QString settingsFilename = QDir::homePath() + QString("/.ucmwbrc");
 108     QString settingsDirname  = QDir::homePath() + QString("/.ucmwb.d");
 109     QString filterFilename   = settingsDirname + QString("/filters");
 110 </pre></div>
 111
 112 <p>OK so first ask yourself what do you see wrong here.....?</p>
 113
 114 <p>Pencils down!</p>
 115
 116 <p>Here's my questions:</p>
 117
 118 <ol>
 119   <li>Why go through the effort of getting the user's homePath, check to see if it's empty and then compose one with "/home" + appUsername only then to totally ignore all that work and get it again for settingsFilename?</li>
 120
 121   <li>Why then do this operation of obtaining homePath yet again to set settingsDirname?</li>
 122
 123   <li>If homePath were determined to be empty, aren't you ignoring what you set it to?</li>
 124 </ol>
 125
 126 <p>Naturally I fixed this to be:</p>
 127
 128 <div class=code><pre>
 129     QSting homePath = QDir::homePath();
 130
 131     if (homePath.isEmpty()) {
 132       // Note the following is a Unix'ism and non portable!
 133       homePath = QString("/home/") + appUsername;
 134     }
 135
 136     QString settingsFilename = homePath + QString("/.ucmwbrc");
 137     QString settingsDirname  = homePath + QString("/.ucmwb.d");
 138     QString filterFilename   = settingsDirname + QString("/filters");
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