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<a name="strncasecmp_002d_002d_002dcase_002dinsensitive-character-string-compare"></a>
<h3 class="section">5.31 <code>strncasecmp</code>&mdash;case-insensitive character string compare</h3>
<a name="index-strncasecmp"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;strings.h&gt;
int strncasecmp(const char *<var>a</var>, const char * <var>b</var>, size_t <var>length</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>strncasecmp</code> compares up to <var>length</var> characters
from the string at <var>a</var> to the string at <var>b</var> in a 
case-insensitive manner.
</p>
<br>
<p><strong>Returns</strong><br>
</p>
<p>If <code>*<var>a</var></code> sorts lexicographically after <code>*<var>b</var></code> (after
both are converted to lowercase), <code>strncasecmp</code> returns a
number greater than zero.  If the two strings are equivalent,
<code>strncasecmp</code> returns zero.  If <code>*<var>a</var></code> sorts
lexicographically before <code>*<var>b</var></code>, <code>strncasecmp</code> returns a
number less than zero.
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<br>
<p><strong>Portability</strong><br>
<code>strncasecmp</code> is in the Berkeley Software Distribution.
</p>
<p><code>strncasecmp</code> requires no supporting OS subroutines. It uses
tolower() from elsewhere in this library.
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