Adds asio library and Storage Module
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>read_until (13 of 24 overloads)</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="overload12.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../read_until.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="overload14.html"><img src="../../../next.png" alt="Next"></a>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h4 class="title">
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<a name="asio.reference.read_until.overload13"></a><a class="link" href="overload13.html" title="read_until (13 of 24 overloads)">read_until (13
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of 24 overloads)</a>
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</h4></div></div></div>
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<p>
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Read data into a streambuf until some part of the data it contains matches
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a regular expression.
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</p>
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<pre class="programlisting">template<
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typename <a class="link" href="../SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename Allocator>
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std::size_t read_until(
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SyncReadStream & s,
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asio::basic_streambuf< Allocator > & b,
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const boost::regex & expr);
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</pre>
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<p>
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This function is used to read data into the specified streambuf until the
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streambuf's get area contains some data that matches a regular expression.
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The call will block until one of the following conditions is true:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem">
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A substring of the streambuf's get area matches the regular expression.
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</li>
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<li class="listitem">
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An error occurred.
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</li>
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</ul></div>
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<p>
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This operation is implemented in terms of zero or more calls to the stream's
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read_some function. If the streambuf's get area already contains data that
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matches the regular expression, the function returns immediately.
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</p>
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<h6>
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<a name="asio.reference.read_until.overload13.h0"></a>
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<span><a name="asio.reference.read_until.overload13.parameters"></a></span><a class="link" href="overload13.html#asio.reference.read_until.overload13.parameters">Parameters</a>
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</h6>
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<div class="variablelist">
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<p class="title"><b></b></p>
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<dl>
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<dt><span class="term">s</span></dt>
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<dd><p>
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The stream from which the data is to be read. The type must support
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the SyncReadStream concept.
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</p></dd>
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<dt><span class="term">b</span></dt>
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<dd><p>
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A streambuf object into which the data will be read.
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</p></dd>
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<dt><span class="term">expr</span></dt>
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<dd><p>
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The regular expression.
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</p></dd>
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</dl>
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</div>
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<h6>
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<a name="asio.reference.read_until.overload13.h1"></a>
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<span><a name="asio.reference.read_until.overload13.return_value"></a></span><a class="link" href="overload13.html#asio.reference.read_until.overload13.return_value">Return
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Value</a>
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</h6>
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<p>
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The number of bytes in the streambuf's get area up to and including the
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substring that matches the regular expression.
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</p>
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<h6>
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<a name="asio.reference.read_until.overload13.h2"></a>
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<span><a name="asio.reference.read_until.overload13.exceptions"></a></span><a class="link" href="overload13.html#asio.reference.read_until.overload13.exceptions">Exceptions</a>
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</h6>
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<div class="variablelist">
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<p class="title"><b></b></p>
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<dl>
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<dt><span class="term">asio::system_error</span></dt>
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<dd><p>
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Thrown on failure.
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</p></dd>
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</dl>
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</div>
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<h6>
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<a name="asio.reference.read_until.overload13.h3"></a>
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<span><a name="asio.reference.read_until.overload13.remarks"></a></span><a class="link" href="overload13.html#asio.reference.read_until.overload13.remarks">Remarks</a>
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</h6>
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<p>
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After a successful read_until operation, the streambuf may contain additional
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data beyond that which matched the regular expression. An application will
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typically leave that data in the streambuf for a subsequent read_until
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operation to examine.
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</p>
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<h6>
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<a name="asio.reference.read_until.overload13.h4"></a>
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<span><a name="asio.reference.read_until.overload13.example"></a></span><a class="link" href="overload13.html#asio.reference.read_until.overload13.example">Example</a>
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</h6>
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<p>
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To read data into a streambuf until a CR-LF sequence is encountered:
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</p>
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<pre class="programlisting">asio::streambuf b;
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asio::read_until(s, b, boost::regex("\r\n"));
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std::istream is(&b);
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std::string line;
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std::getline(is, line);
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</pre>
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<p>
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After the <code class="computeroutput">read_until</code> operation completes successfully, the
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buffer <code class="computeroutput">b</code> contains the data which matched the regular expression:
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</p>
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<pre class="programlisting">{ 'a', 'b', ..., 'c', '\r', '\n', 'd', 'e', ... }
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</pre>
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<p>
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The call to <code class="computeroutput">std::getline</code> then extracts the data up to and
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including the newline (which is discarded), so that the string <code class="computeroutput">line</code>
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contains:
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</p>
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<pre class="programlisting">{ 'a', 'b', ..., 'c', '\r' }
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</pre>
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<p>
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The remaining data is left in the buffer <code class="computeroutput">b</code> as follows:
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</p>
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<pre class="programlisting">{ 'd', 'e', ... }
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</pre>
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<p>
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This data may be the start of a new line, to be extracted by a subsequent
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<code class="computeroutput">read_until</code> operation.
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</p>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M.
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Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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</p>
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</div></td>
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</tr></table>
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