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<title>BIO_find_type</title>
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<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
  <li><a href="#EXAMPLES">EXAMPLES</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>

<h1 id="NAME">NAME</h1>

<p>BIO_find_type, BIO_next, BIO_method_type - BIO chain traversal</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> #include &lt;openssl/bio.h&gt;

 BIO *BIO_find_type(BIO *b, int bio_type);
 BIO *BIO_next(BIO *b);
 int BIO_method_type(const BIO *b);</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>The BIO_find_type() searches for a BIO of a given type in a chain, starting at BIO <b>b</b>. If <b>type</b> is a specific type (such as <b>BIO_TYPE_MEM</b>) then a search is made for a BIO of that type. If <b>type</b> is a general type (such as <b>BIO_TYPE_SOURCE_SINK</b>) then the next matching BIO of the given general type is searched for. BIO_find_type() returns the next matching BIO or NULL if none is found.</p>

<p>The following general types are defined: <b>BIO_TYPE_DESCRIPTOR</b>, <b>BIO_TYPE_FILTER</b>, and <b>BIO_TYPE_SOURCE_SINK</b>.</p>

<p>For a list of the specific types, see the <b>openssl/bio.h</b> header file.</p>

<p>BIO_next() returns the next BIO in a chain. It can be used to traverse all BIOs in a chain or used in conjunction with BIO_find_type() to find all BIOs of a certain type.</p>

<p>BIO_method_type() returns the type of a BIO.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>BIO_find_type() returns a matching BIO or NULL for no match.</p>

<p>BIO_next() returns the next BIO in a chain.</p>

<p>BIO_method_type() returns the type of the BIO <b>b</b>.</p>

<h1 id="EXAMPLES">EXAMPLES</h1>

<p>Traverse a chain looking for digest BIOs:</p>

<pre><code> BIO *btmp;

 btmp = in_bio; /* in_bio is chain to search through */
 do {
     btmp = BIO_find_type(btmp, BIO_TYPE_MD);
     if (btmp == NULL)
         break; /* Not found */
     /* btmp is a digest BIO, do something with it ...*/
     ...

     btmp = BIO_next(btmp);
 } while (btmp);</code></pre>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.</p>

<p>Licensed under the OpenSSL license (the &quot;License&quot;). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>


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