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<div class="subsubsection-level-extent" id="Bytevector-Endianness">
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Next: <a href="Bytevector-Manipulation.html" accesskey="n" rel="next">Manipulating Bytevectors</a>, Up: <a href="Bytevectors.html" accesskey="u" rel="up">Bytevectors</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<h4 class="subsubsection" id="Endianness"><span>6.6.12.1 Endianness<a class="copiable-link" href="#Endianness"> &para;</a></span></h4>
<a class="index-entry-id" id="index-endianness"></a>
<a class="index-entry-id" id="index-byte-order"></a>
<a class="index-entry-id" id="index-word-order"></a>
<p>Some of the following procedures take an <var class="var">endianness</var> parameter.
The <em class="dfn">endianness</em> is defined as the order of bytes in multi-byte
numbers: numbers encoded in <em class="dfn">big endian</em> have their most
significant bytes written first, whereas numbers encoded in
<em class="dfn">little endian</em> have their least significant bytes
first<a class="footnote" id="DOCF10" href="#FOOT10"><sup>10</sup></a>.
</p>
<p>Little-endian is the native endianness of the IA32 architecture and
its derivatives, while big-endian is native to SPARC and PowerPC,
among others. The <code class="code">native-endianness</code> procedure returns the
native endianness of the machine it runs on.
</p>
<dl class="first-deffn">
<dt class="deffn" id="index-native_002dendianness"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">native-endianness</strong><a class="copiable-link" href="#index-native_002dendianness"> &para;</a></span></dt>
<dt class="deffnx def-cmd-deffn" id="index-scm_005fnative_005fendianness"><span class="category-def">C Function: </span><span><strong class="def-name">scm_native_endianness</strong> <var class="def-var-arguments">()</var><a class="copiable-link" href="#index-scm_005fnative_005fendianness"> &para;</a></span></dt>
<dd><p>Return a value denoting the native endianness of the host machine.
</p></dd></dl>
<dl class="first-deffn">
<dt class="deffn" id="index-endianness-1"><span class="category-def">Scheme Macro: </span><span><strong class="def-name">endianness</strong> <var class="def-var-arguments">symbol</var><a class="copiable-link" href="#index-endianness-1"> &para;</a></span></dt>
<dd><p>Return an object denoting the endianness specified by <var class="var">symbol</var>. If
<var class="var">symbol</var> is neither <code class="code">big</code> nor <code class="code">little</code> then an error is
raised at expand-time.
</p></dd></dl>
<dl class="first-defvr">
<dt class="defvr" id="index-scm_005fendianness_005fbig"><span class="category-def">C Variable: </span><span><strong class="def-name">scm_endianness_big</strong><a class="copiable-link" href="#index-scm_005fendianness_005fbig"> &para;</a></span></dt>
<dt class="defvrx def-cmd-defvr" id="index-scm_005fendianness_005flittle"><span class="category-def">C Variable: </span><span><strong class="def-name">scm_endianness_little</strong><a class="copiable-link" href="#index-scm_005fendianness_005flittle"> &para;</a></span></dt>
<dd><p>The objects denoting big- and little-endianness, respectively.
</p></dd></dl>
</div>
<div class="footnotes-segment">
<hr>
<h4 class="footnotes-heading">Footnotes</h4>
<h5 class="footnote-body-heading"><a id="FOOT10" href="#DOCF10">(10)</a></h5>
<p>Big-endian and little-endian are the most common
&ldquo;endiannesses&rdquo;, but others do exist. For instance, the GNU MP
library allows <em class="dfn">word order</em> to be specified independently of
<em class="dfn">byte order</em> (see <a data-manual="gmp" href="https://www.gmplib.org/manual/Integer-Import-and-Export.html#Integer-Import-and-Export">Integer Import and Export</a> in <cite class="cite">The GNU
Multiple Precision Arithmetic Library Manual</cite>).</p>
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