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<a name="iscntrl"></a>
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<p>
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Next: <a href="isdigit.html#isdigit" accesskey="n" rel="next">isdigit</a>, Previous: <a href="isblank.html#isblank" accesskey="p" rel="prev">isblank</a>, Up: <a href="Ctype.html#Ctype" accesskey="u" rel="up">Ctype</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="iscntrl_002c-iscntrl_005fl_002d_002d_002dcontrol-character-predicate"></a>
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<h3 class="section">3.5 <code>iscntrl</code>, <code>iscntrl_l</code>—control character predicate</h3>
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<a name="index-iscntrl"></a>
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<a name="index-iscntrl_005fl"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <ctype.h>
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int iscntrl(int <var>c</var>);
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#include <ctype.h>
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int iscntrl_l(int <var>c</var>, locale_t <var>locale</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>iscntrl</code> is a macro which classifies singlebyte charset values by table
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lookup. It is a predicate returning non-zero for control characters, and 0
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for other characters. It is defined only if <var>c</var> is representable as an
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unsigned char or if <var>c</var> is EOF.
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</p>
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<p><code>iscntrl_l</code> is like <code>iscntrl</code> but performs the check based on the
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locale specified by the locale object locale. If <var>locale</var> is
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LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
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</p>
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<p>You can use a compiled subroutine instead of the macro definition by
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undefining the macro using ‘<code>#undef iscntrl</code>’ or ‘<code>#undef iscntrl_l</code>’.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>iscntrl</code>, <code>iscntrl_l</code> return non-zero if <var>c</var> is a delete character
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or ordinary control character.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>iscntrl</code> is ANSI C.
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<code>iscntrl_l</code> is POSIX-1.2008.
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</p>
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<p>No supporting OS subroutines are required.
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</p>
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