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115 lines
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<title>read_until (2 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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<div class="titlepage"><div><div><h4 class="title">
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<a name="asio.reference.read_until.overload2"></a><a class="link" href="overload2.html" title="read_until (2 of 24 overloads)">read_until (2
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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 dynamic buffer sequence until it contains a specified
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delimiter.
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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> <a class="link" href="../DynamicBuffer_v1.html" title="Dynamic buffer requirements (version 1)">DynamicBuffer_v1</a><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">DynamicBuffer_v1</span> <span class="special">&&</span> <span class="identifier">buffers</span><span class="special">,</span>
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<span class="keyword">char</span> <span class="identifier">delim</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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<span class="keyword">typename</span> <span class="identifier">constraint</span><span class="special"><</span> <span class="identifier">is_dynamic_buffer_v1</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">decay</span><span class="special"><</span> <span class="identifier">DynamicBuffer_v1</span> <span class="special">>::</span><span class="identifier">type</span> <span class="special">>::</span><span class="identifier">value</span> <span class="special">>::</span><span class="identifier">type</span> <span class="special">=</span> <span class="number">0</span><span class="special">,</span>
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<span class="keyword">typename</span> <span class="identifier">constraint</span><span class="special"><</span> <span class="special">!</span><span class="identifier">is_dynamic_buffer_v2</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">decay</span><span class="special"><</span> <span class="identifier">DynamicBuffer_v1</span> <span class="special">>::</span><span class="identifier">type</span> <span class="special">>::</span><span class="identifier">value</span> <span class="special">>::</span><span class="identifier">type</span> <span class="special">=</span> <span class="number">0</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 dynamic buffer sequence
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until the dynamic buffer sequence's get area contains the specified delimiter.
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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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The get area of the dynamic buffer sequence contains the specified
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delimiter.
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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 dynamic buffer sequence's get area already contains
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the delimiter, the function returns immediately.
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</p>
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<h6>
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<a name="asio.reference.read_until.overload2.h0"></a>
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<span><a name="asio.reference.read_until.overload2.parameters"></a></span><a class="link" href="overload2.html#asio.reference.read_until.overload2.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">buffers</span></dt>
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<dd><p>
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The dynamic buffer sequence into which the data will be read.
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</p></dd>
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<dt><span class="term">delim</span></dt>
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<dd><p>
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The delimiter character.
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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.overload2.h1"></a>
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<span><a name="asio.reference.read_until.overload2.return_value"></a></span><a class="link" href="overload2.html#asio.reference.read_until.overload2.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 dynamic buffer sequence's get area up to and
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including the delimiter. 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.overload2.h2"></a>
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<span><a name="asio.reference.read_until.overload2.remarks"></a></span><a class="link" href="overload2.html#asio.reference.read_until.overload2.remarks">Remarks</a>
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</h6>
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<p>
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After a successful read_until operation, the dynamic buffer sequence may
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contain additional data beyond the delimiter. An application will typically
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leave that data in the dynamic buffer sequence 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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