112 lines
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112 lines
6.5 KiB
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<title>read_until (14 of 24 overloads)</title>
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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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<a accesskey="p" href="overload13.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="overload15.html"><img src="../../../next.png" alt="Next"></a>
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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.overload14"></a><a class="link" href="overload14.html" title="read_until (14 of 24 overloads)">read_until (14
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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"><span class="keyword">template</span><span class="special"><</span>
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<span class="keyword">typename</span> <a class="link" href="../SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a><span class="special">,</span>
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<span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">></span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">read_until</span><span class="special">(</span>
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<span class="identifier">SyncReadStream</span> <span class="special">&</span> <span class="identifier">s</span><span class="special">,</span>
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<span class="identifier">asio</span><span class="special">::</span><span class="identifier">basic_streambuf</span><span class="special"><</span> <span class="identifier">Allocator</span> <span class="special">></span> <span class="special">&</span> <span class="identifier">b</span><span class="special">,</span>
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<span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex</span> <span class="special">&</span> <span class="identifier">expr</span><span class="special">,</span>
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<span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> <span class="identifier">ec</span><span class="special">);</span>
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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.overload14.h0"></a>
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<span><a name="asio.reference.read_until.overload14.parameters"></a></span><a class="link" href="overload14.html#asio.reference.read_until.overload14.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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<dt><span class="term">ec</span></dt>
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<dd><p>
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Set to indicate what error occurred, if any.
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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.overload14.h1"></a>
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<span><a name="asio.reference.read_until.overload14.return_value"></a></span><a class="link" href="overload14.html#asio.reference.read_until.overload14.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. Returns 0 if an error occurred.
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</p>
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<h6>
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<a name="asio.reference.read_until.overload14.h2"></a>
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<span><a name="asio.reference.read_until.overload14.remarks"></a></span><a class="link" href="overload14.html#asio.reference.read_until.overload14.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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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher M. 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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