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<title>Online Demo - Cppcheck</title>
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<h1>Cppcheck</h1>
<p>A tool for static C/C++ code analysis</p>
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<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>
<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>
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<h2>Online Demo</h2>
<form action="/demo/report/" name="f" onsubmit="return checkCodeLength();" method="post" target="_blank">
<p><label for="code">Enter code:</label><br />
<textarea id="code" name="code" rows="20" cols="80">
void f()
{
char *p;
*p = 0;
}
</textarea><br />
<input type="submit" value="Check" /> (max 1024 characters)</p>
</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->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->x = 0;
}</pre>
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