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<title>ffs</title>
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<basefont size="3"> <a name="ffs"></a> <a name="tag_03_161"></a><!-- ffs -->
<!--header start-->
<center><font size="2">The Open Group Base Specifications Issue 6<br>
IEEE Std 1003.1-2001<br>
Copyright &copy; 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
<!--header end-->
<hr size="2" noshade>
<h4><a name="tag_03_161_01"></a>NAME</h4>
<blockquote>ffs - find first set bit</blockquote>
<h4><a name="tag_03_161_02"></a>SYNOPSIS</h4>
<blockquote class="synopsis">
<div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt=
"[Option Start]" border="0"> #include &lt;<a href="../basedefs/strings.h.html">strings.h</a>&gt;<br>
<br>
int ffs(int</tt> <i>i</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
<tt><br>
</tt></blockquote>
<h4><a name="tag_03_161_03"></a>DESCRIPTION</h4>
<blockquote>
<p>The <i>ffs</i>() function shall find the first bit set (beginning with the least significant bit) in <i>i</i>, and return the
index of that bit. Bits are numbered starting at one (the least significant bit).</p>
</blockquote>
<h4><a name="tag_03_161_04"></a>RETURN VALUE</h4>
<blockquote>
<p>The <i>ffs</i>() function shall return the index of the first bit set. If <i>i</i> is 0, then <i>ffs</i>() shall return 0.</p>
</blockquote>
<h4><a name="tag_03_161_05"></a>ERRORS</h4>
<blockquote>
<p>No errors are defined.</p>
</blockquote>
<hr>
<div class="box"><em>The following sections are informative.</em></div>
<h4><a name="tag_03_161_06"></a>EXAMPLES</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_161_07"></a>APPLICATION USAGE</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_161_08"></a>RATIONALE</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_161_09"></a>FUTURE DIRECTIONS</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_161_10"></a>SEE ALSO</h4>
<blockquote>
<p>The Base Definitions volume of IEEE&nbsp;Std&nbsp;1003.1-2001, <a href=
"../basedefs/strings.h.html"><i>&lt;strings.h&gt;</i></a></p>
</blockquote>
<h4><a name="tag_03_161_11"></a>CHANGE HISTORY</h4>
<blockquote>
<p>First released in Issue 4, Version 2.</p>
</blockquote>
<h4><a name="tag_03_161_12"></a>Issue 5</h4>
<blockquote>
<p>Moved from X/OPEN UNIX extension to BASE.</p>
</blockquote>
<div class="box"><em>End of informative text.</em></div>
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