<!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"
lang="en" dir="ltr">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>
snprintf [C++ Reference]
</title>
<meta name="generator" content="DokuWiki Release 2009-12-25c "Lemming"" />
<meta name="robots" content="index,follow" />
<meta name="date" content="2008-11-11T05:16:38-0800" />
<meta name="keywords" content="c,io,snprintf" />
<link rel="search" type="application/opensearchdescription+xml" href="/wiki/lib/exe/opensearch.php" title="C++ Reference" />
<link rel="start" href="/wiki/" />
<link rel="contents" href="/wiki/c/io/snprintf?do=index" title="Index" />
<link rel="alternate" type="application/rss+xml" title="Recent Changes" href="/wiki/feed.php" />
<link rel="alternate" type="application/rss+xml" title="Current Namespace" href="/wiki/feed.php?mode=list&ns=c:io" />
<link rel="edit" title="Edit this page" href="/wiki/c/io/snprintf?do=edit" />
<link rel="alternate" type="text/html" title="Plain HTML" href="/wiki/_export/xhtml/c/io/snprintf" />
<link rel="alternate" type="text/plain" title="Wiki Markup" href="/wiki/_export/raw/c/io/snprintf" />
<link rel="canonical" href="http://www.cppreference.com/wiki/c/io/snprintf" />
<link rel="stylesheet" media="all" type="text/css" href="/wiki/lib/exe/css.php?s=all&t=custom1&tseed=1272971091" />
<link rel="stylesheet" media="screen" type="text/css" href="/wiki/lib/exe/css.php?t=custom1&tseed=1272971091" />
<link rel="stylesheet" media="print" type="text/css" href="/wiki/lib/exe/css.php?s=print&t=custom1&tseed=1272971091" />
<script type="text/javascript" charset="utf-8" ><!--//--><![CDATA[//><!--
var NS='c:io';var JSINFO = {"id":"c:io:snprintf","namespace":"c:io"};
//--><!]]></script>
<script type="text/javascript" charset="utf-8" src="/wiki/lib/exe/js.php?tseed=1272971091" ></script>
<link rel="shortcut icon" href="/wiki/lib/tpl/custom1/images/favicon.png" />
</head>
<body>
<div class="dokuwiki">
<div class="stylehead">
<div class="breadcrumbs">
<span class="bchead">You are here: </span><a href="../../start.html" title="start">C++ Reference</a> » <a href="../../c/start.html" title="c:start">The Standard C Library</a> » <a href="../../c/io/start.html" title="c:io:start">Standard C I/O</a> » <a href="../../c/io/snprintf.html" title="c:io:snprintf">snprintf</a> </div>
</div>
<div class="page">
<script src="http://www.google-analytics.com/urchin.js" type="text/javascript">
</script>
<script type="text/javascript">
_uacct = "UA-2828341-1";
urchinTracker();
</script>
<!-- wikipage start -->
<h2><a name="snprintf" id="snprintf">snprintf</a></h2>
<div class="level2">
<p>
Syntax:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="co2">#include <cstdio></span>
<span class="kw4">int</span> snprintf<span class="br0">(</span> <span class="kw4">char</span> <span class="sy0">*</span>buffer<span class="sy0">,</span> <span class="kw4">int</span> buff_size<span class="sy0">,</span> <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy0">*</span>format<span class="sy0">,</span> ... <span class="br0">)</span><span class="sy0">;</span></pre>
<p>
The snprintf() function is just like sprintf(), except that the length of the buffer is given. This prevents buffer overflows.
</p>
<p>
The return value is the number of characters written. If the output was truncated due to buff_size limit then the return value is the number of characters (not including the trailing '\0') which would have been written to the final string if enough space had been available.
</p>
<p>
Related Topics: <a href="../../c/io/sprintf.html" class="wikilink1" title="c:io:sprintf">sprintf</a>, <a href="../../c/string/atof.html" class="wikilink1" title="c:string:atof">atof</a>, <a href="../../c/string/atoi.html" class="wikilink1" title="c:string:atoi">atoi</a>, <a href="../../c/string/atol.html" class="wikilink1" title="c:string:atol">atol</a>, <a href="../../c/io/fprintf.html" class="wikilink1" title="c:io:fprintf">fprintf</a>, <a href="../../c/io/printf.html" class="wikilink1" title="c:io:printf">printf</a>
</p>
</div>
<!-- wikipage stop -->
</div>
<div class="clearer"> </div>
<div class="stylefoot">
<div class="meta">
<div class="user">
</div>
<!--
<div class="doc">
c/io/snprintf.txt · Last modified: 11/11/2008 05:16 by 213.120.90.67 </div>
-->
</div>
</div></div></body>
</html>