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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>null-char-p</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="UFFI Reference Guide" /><link rel="up" href="primitives.html" title="Primitive Types" /><link rel="prev" href="def-foreign-type.html" title="def-foreign-type" /><link rel="next" href="aggregates.html" title="Aggregate Types" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">null-char-p</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="def-foreign-type.html">Prev</a> </td><th width="60%" align="center">Primitive Types</th><td width="20%" align="right"> <a accesskey="n" href="aggregates.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="null-char-p"><a id="null-char-p"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>null-char-p — Tests a character for <code class="constant">NULL</code> value.
<b>Macro</b></p></div><div class="refsect1" title="Syntax"><a id="id396920"></a><h2>Syntax</h2><pre class="synopsis">
<code class="function">null-char-p</code> <em class="replaceable"><code>char</code></em> => <span class="returnvalue">is-null</span>
</pre></div><div class="refsect1" title="Arguments and Values"><a id="id396947"></a><h2>Arguments and Values</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>char</code></em></span></dt><dd><p>A character or integer.
</p></dd><dt><span class="term"><em class="parameter"><code>is-null</code></em></span></dt><dd><p>A boolean flag indicating if char is a <code class="constant">NULL</code> value.
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id396998"></a><h2>Description</h2><p>
A predicate testing if a character or integer is <code class="constant">NULL</code>. This
abstracts the difference in implementations where some return a
<code class="computeroutput">character</code>
and some return a
<code class="computeroutput">integer</code>
whence dereferencing a
<code class="computeroutput">C</code>
character pointer.
</p></div><div class="refsect1" title="Examples"><a id="id397031"></a><h2>Examples</h2><pre class="screen">
(def-array-pointer ca :unsigned-char)
(let ((fs (convert-to-foreign-string "ab")))
(values (null-char-p (deref-array fs 'ca 0))
(null-char-p (deref-array fs 'ca 2))))
=> <code class="constant">NIL</code>
<code class="constant">T</code>
</pre></div><div class="refsect1" title="Side Effects"><a id="id397053"></a><h2>Side Effects</h2><p>None.
</p></div><div class="refsect1" title="Affected by"><a id="id397065"></a><h2>Affected by</h2><p>None.</p></div><div class="refsect1" title="Exceptional Situations"><a id="id397076"></a><h2>Exceptional Situations</h2><p>None.</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="def-foreign-type.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="primitives.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="aggregates.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">def-foreign-type </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Aggregate Types</td></tr></table></div></body></html>
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