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toolchain-gcc-arm-embedded

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<a name="isascii_002c-isascii_005fl_002d_002d_002dASCII-character-predicate"></a>
<h3 class="section">3.3 <code>isascii</code>, <code>isascii_l</code>&mdash;ASCII character predicate</h3>
<a name="index-isascii"></a>
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<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;ctype.h&gt;
int isascii(int <var>c</var>);

#include &lt;ctype.h&gt;
int isascii_l(int <var>c</var>, locale_t <var>locale</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>isascii</code> is a macro which returns non-zero when <var>c</var> is an ASCII
character, and 0 otherwise.  It is defined for all integer values.
</p>
<p><code>isascii_l</code> is like <code>isascii</code> but performs the check based on the
locale specified by the locale object locale.  If <var>locale</var> is
LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
</p>
<p>You can use a compiled subroutine instead of the macro definition by
undefining the macro using &lsquo;<code>#undef isascii</code>&rsquo; or &lsquo;<code>#undef isascii_l</code>&rsquo;.
</p>
<br>
<p><strong>Returns</strong><br>
<code>isascii</code>, <code>isascii_l</code> return non-zero if the low order byte of <var>c</var>
is in the range 0 to 127 (<code>0x00</code>&ndash;<code>0x7F</code>).
</p>
<br>
<p><strong>Portability</strong><br>
<code>isascii</code> is ANSI C.
<code>isascii_l</code> is a GNU extension.
</p>
<p>No supporting OS subroutines are required.
</p>
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