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<a name="getline_002d_002d_002dread-a-line-from-a-file"></a>
<h3 class="section">4.38 <code>getline</code>&mdash;read a line from a file</h3>
<a name="index-getline"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;stdio.h&gt;
ssize_t getline(char **<var>bufptr</var>, size_t *<var>n</var>, FILE *<var>fp</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>getline</code> reads a file <var>fp</var> up to and possibly including the
newline character.  The line is read into a buffer pointed to
by <var>bufptr</var> and designated with size *<var>n</var>.  If the buffer is
not large enough, it will be dynamically grown by <code>getdelim</code>.
As the buffer is grown, the pointer to the size <var>n</var> will be
updated.
</p>
<p><code>getline</code> is equivalent to getdelim(bufptr, n, &rsquo;\n&rsquo;, fp);
</p>
<br>
<p><strong>Returns</strong><br>
<code>getline</code> returns <code>-1</code> if no characters were successfully read,
otherwise, it returns the number of bytes successfully read.
at end of file, the result is nonzero.
</p>
<br>
<p><strong>Portability</strong><br>
<code>getline</code> is a glibc extension.
</p>
<p>No supporting OS subroutines are directly required.
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