2012-05-17 18:07:38 +02:00
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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2012-05-20 14:21:17 +02:00
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<title>Online Demo - Cppcheck</title>
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2012-09-26 13:44:45 +02:00
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<link rel="stylesheet" type="text/css" href="//fonts.googleapis.com/css?family=Orbitron&text=Cppcheck" />
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2012-11-29 16:02:25 +01:00
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<link rel="stylesheet" type="text/css" href="/site/css/pack.css" />
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2012-05-17 18:07:38 +02:00
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<link rel="shortcut icon" type="image/x-icon" href="/favicon.ico" />
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<script type="text/javascript">
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function checkCodeLength() {
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if (document.f.code.value.length > 1024) {
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alert('code length exceeded');
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return false;
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}
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return true;
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}
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</script>
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</head>
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<body>
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<div id="header">
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<div class="wrap">
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<h1>Cppcheck</h1>
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<p>A tool for static C/C++ code analysis</p>
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</div> <!-- .wrap -->
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</div> <!-- #header -->
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<div id="tabs">
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<div class="wrap">
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<ul>
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<li><a href="/">Home</a></li>
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<li><a href="http://sourceforge.net/apps/mediawiki/cppcheck/">Wiki</a></li>
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<li><a href="http://sourceforge.net/apps/phpbb/cppcheck/">Forum</a></li>
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2012-07-12 21:24:46 +02:00
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<li><a href="http://sourceforge.net/apps/trac/cppcheck/">Issues</a></li>
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2012-05-17 18:07:38 +02:00
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<li><a href="/devinfo/" title="Developer Information">Developer Info</a></li>
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<li><strong><a href="/demo/">Online Demo</a></strong></li>
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<li><a href="http://sourceforge.net/projects/cppcheck/">Project page</a></li>
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</ul>
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</div> <!-- .wrap -->
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</div> <!-- #tabs -->
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<div id="content">
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<div class="wrap">
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<h2>Online Demo</h2>
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2012-05-20 14:21:17 +02:00
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<form action="/demo/report/" name="f" onsubmit="return checkCodeLength();" method="post" target="_blank">
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2012-09-18 18:51:47 +02:00
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<p><label for="code">Enter code:</label> <i class="maxChars">(max 1024 characters)</i><br />
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2012-05-17 18:07:38 +02:00
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<textarea id="code" name="code" rows="20" cols="80">
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void f()
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{
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char *p;
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*p = 0;
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}
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</textarea><br />
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2012-09-18 18:51:47 +02:00
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<input type="submit" value="Check" />
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<label><input type="checkbox" name="xml" value="1" />XML output</label></p>
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2012-05-17 18:07:38 +02:00
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</form>
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<h3>Examples</h3>
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<p>This code can be copy and pasted in the edit box above.</p>
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<h4>NULL pointers</h4>
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2012-09-29 15:00:52 +02:00
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<pre class="cpp geshicode"><span class="kw4">void</span> f1<span class="br0">(</span><span class="kw4">struct</span> fred_t <span class="sy2">*</span>p<span class="br0">)</span>
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<span class="br0">{</span>
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<span class="co1">// dereference p and then check if it's NULL</span>
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<span class="kw4">int</span> x <span class="sy1">=</span> p<span class="sy2">-</span><span class="sy1">></span>x<span class="sy4">;</span>
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<span class="kw1">if</span> <span class="br0">(</span>p<span class="br0">)</span>
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do_something<span class="br0">(</span>x<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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2012-05-17 18:07:38 +02:00
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2012-09-29 15:00:52 +02:00
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<span class="kw4">void</span> f2<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span>p <span class="sy1">=</span> <span class="kw2">NULL</span><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">int</span> i <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> str<span class="br0">[</span>i<span class="br0">]</span> <span class="sy3">!</span><span class="sy1">=</span> <span class="st0">'<span class="es5">\0</span>'</span><span class="sy4">;</span> i<span class="sy2">++</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw1">if</span> <span class="br0">(</span>str<span class="br0">[</span>i<span class="br0">]</span> <span class="sy1">==</span> <span class="st0">' '</span><span class="br0">)</span>
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<span class="br0">{</span>
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p <span class="sy1">=</span> str <span class="sy2">+</span> i<span class="sy4">;</span>
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<span class="kw1">break</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">}</span>
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2012-05-17 18:07:38 +02:00
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2012-09-29 15:00:52 +02:00
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<span class="co1">// p is NULL if str doesn't have a space. If str always has a</span>
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<span class="co1">// a space then the condition (str[i] != '\0') would be redundant</span>
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<span class="kw1">return</span> p<span class="br0">[</span><span class="nu0">1</span><span class="br0">]</span><span class="sy4">;</span>
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<span class="br0">}</span>
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2012-05-17 18:07:38 +02:00
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2012-09-29 15:00:52 +02:00
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<span class="kw4">void</span> f3<span class="br0">(</span><span class="kw4">int</span> a<span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw4">struct</span> fred_t <span class="sy2">*</span>p <span class="sy1">=</span> <span class="kw2">NULL</span><span class="sy4">;</span>
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<span class="kw1">if</span> <span class="br0">(</span>a <span class="sy1">==</span> <span class="nu0">1</span><span class="br0">)</span>
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p <span class="sy1">=</span> fred1<span class="sy4">;</span>
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2012-05-17 18:07:38 +02:00
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2012-09-29 15:00:52 +02:00
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<span class="co1">// if a is not 1 then p is NULL</span>
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p<span class="sy2">-</span><span class="sy1">></span>x <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
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<span class="br0">}</span></pre>
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2012-05-17 18:07:38 +02:00
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</div> <!-- .wrap -->
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</div> <!-- #content -->
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</body>
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</html>
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