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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="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>

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

<p>ERR_error_string, ERR_error_string_n, ERR_lib_error_string, ERR_func_error_string, ERR_reason_error_string - obtain human-readable error message</p>

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

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

 char *ERR_error_string(unsigned long e, char *buf);
 void ERR_error_string_n(unsigned long e, char *buf, size_t len);

 const char *ERR_lib_error_string(unsigned long e);
 const char *ERR_func_error_string(unsigned long e);
 const char *ERR_reason_error_string(unsigned long e);</code></pre>

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

<p>ERR_error_string() generates a human-readable string representing the error code <i>e</i>, and places it at <i>buf</i>. <i>buf</i> must be at least 256 bytes long. If <i>buf</i> is <b>NULL</b>, the error string is placed in a static buffer. Note that this function is not thread-safe and does no checks on the size of the buffer; use ERR_error_string_n() instead.</p>

<p>ERR_error_string_n() is a variant of ERR_error_string() that writes at most <i>len</i> characters (including the terminating 0) and truncates the string if necessary. For ERR_error_string_n(), <i>buf</i> may not be <b>NULL</b>.</p>

<p>The string will have the following format:</p>

<pre><code> error:[error code]:[library name]:[function name]:[reason string]</code></pre>

<p><i>error code</i> is an 8 digit hexadecimal number, <i>library name</i>, <i>function name</i> and <i>reason string</i> are ASCII text.</p>

<p>ERR_lib_error_string(), ERR_func_error_string() and ERR_reason_error_string() return the library name, function name and reason string respectively.</p>

<p>If there is no text string registered for the given error code, the error string will contain the numeric code.</p>

<p><a href="../man3/ERR_print_errors.html">ERR_print_errors(3)</a> can be used to print all error codes currently in the queue.</p>

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

<p>ERR_error_string() returns a pointer to a static buffer containing the string if <i>buf</i> <b>== NULL</b>, <i>buf</i> otherwise.</p>

<p>ERR_lib_error_string(), ERR_func_error_string() and ERR_reason_error_string() return the strings, and <b>NULL</b> if none is registered for the error code.</p>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<p><a href="../man3/ERR_get_error.html">ERR_get_error(3)</a>, <a href="../man3/ERR_print_errors.html">ERR_print_errors(3)</a></p>

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

<p>Copyright 2000-2017 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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