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88 lines
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<a name="strcspn"></a>
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<p>
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Next: <a href="strerror.html#strerror" accesskey="n" rel="next">strerror</a>, Previous: <a href="strcpy.html#strcpy" accesskey="p" rel="prev">strcpy</a>, Up: <a href="Strings.html#Strings" accesskey="u" rel="up">Strings</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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<a name="strcspn_002d_002d_002dcount-characters-not-in-string"></a>
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<h3 class="section">5.26 <code>strcspn</code>—count characters not in string</h3>
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<a name="index-strcspn"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">size_t strcspn(const char *<var>s1</var>, const char *<var>s2</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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This function computes the length of the initial part of
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the string pointed to by <var>s1</var> which consists entirely of
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characters <var>NOT</var> from the string pointed to by <var>s2</var>
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(excluding the terminating null character).
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>strcspn</code> returns the length of the substring found.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>strcspn</code> is ANSI C.
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</p>
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<p><code>strcspn</code> requires no supporting OS subroutines.
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