cppcheck/htdocs/demo/index.php

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Online Demo - Cppcheck</title>
<link rel="stylesheet" type="text/css" href="//fonts.googleapis.com/css?family=Orbitron&amp;text=Cppcheck" />
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<link rel="stylesheet" type="text/css" href="/site/css/all.min.css" />
<link rel="stylesheet" type="text/css" href="/site/css/demo.min.css" />
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<link rel="shortcut icon" type="image/x-icon" href="/favicon.ico" />
<script type="text/javascript">
function checkCodeLength() {
if (document.f.code.value.length > 1024) {
alert('code length exceeded');
return false;
}
return true;
}
</script>
</head>
<body>
<div id="header">
<div class="wrap">
<h1>Cppcheck</h1>
<p>A tool for static C/C++ code analysis</p>
</div> <!-- .wrap -->
</div> <!-- #header -->
<div id="tabs">
<div class="wrap">
<ul>
<li><a href="/">Home</a></li>
<li><a href="http://sourceforge.net/apps/mediawiki/cppcheck/">Wiki</a></li>
<li><a href="http://sourceforge.net/apps/phpbb/cppcheck/">Forum</a></li>
<li><a href="http://sourceforge.net/apps/trac/cppcheck/">Issues</a></li>
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<li><a href="/devinfo/" title="Developer Information">Developer Info</a></li>
<li><strong><a href="/demo/">Online Demo</a></strong></li>
<li><a href="http://sourceforge.net/projects/cppcheck/">Project page</a></li>
</ul>
</div> <!-- .wrap -->
</div> <!-- #tabs -->
<div id="content">
<div class="wrap">
<h2>Online Demo</h2>
<form action="/demo/report/" name="f" onsubmit="return checkCodeLength();" method="post" target="_blank">
<p><label for="code">Enter code:</label> <i class="maxChars">(max 1024 characters)</i><br />
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<textarea id="code" name="code" rows="20" cols="80">
void f()
{
char *p;
*p = 0;
}
</textarea><br />
<input type="submit" value="Check" />
<label><input type="checkbox" name="xml" value="1" />XML output</label></p>
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</form>
<h3>Examples</h3>
<p>This code can be copy and pasted in the edit box above.</p>
<h4>NULL pointers</h4>
<pre class="code">void f1(struct fred_t *p)
{
<em>// dereference p and then check if it's NULL</em>
int x = p-&gt;x;
if (p)
do_something(x);
}
void f2()
{
const char *p = NULL;
for (int i = 0; str[i] != '\0'; i++)
{
if (str[i] == ' ')
{
p = str + i;
break;
}
}
<em>// p is NULL if str doesn't have a space. If str always has a</em>
<em>// a space then the condition (str[i] != '\0') would be redundant</em>
return p[1];
}
void f3(int a)
{
struct fred_t *p = NULL;
if (a == 1)
p = fred1;
<em>// if a is not 1 then p is NULL</em>
p-&gt;x = 0;
}</pre>
</div> <!-- .wrap -->
</div> <!-- #content -->
</body>
</html>