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* @Id: key_defined.3x,v 1.44 2025/10/04 20:11:22 tom Exp @
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<H1 class="no-header">key_defined 3x 2025-10-04 ncurses 6.6 Library calls</H1>
<PRE>
<STRONG><A HREF="key_defined.3x.html">key_defined(3x)</A></STRONG> Library calls <STRONG><A HREF="key_defined.3x.html">key_defined(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>key_defined</STRONG> - obtain key code for an <EM>ncurses</EM> function key definition
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>int</STRONG> <STRONG>key_defined(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG> <EM>definition</EM><STRONG>);</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
The <STRONG>key_defined</STRONG> <EM>ncurses</EM> extension permits a <EM>curses</EM> application to
determine the function key code, if any, to which the string <EM>definition</EM>
is bound.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
<STRONG>key_defined</STRONG> returns the first key code to which <EM>definition</EM> is bound if
any exists. If none does, it returns <STRONG>0</STRONG>. If <EM>definition</EM> is a prefix of
another bound definition, <STRONG>key_defined</STRONG> returns <STRONG>-1</STRONG>.
</PRE><H2><a name="h2-EXTENSIONS">EXTENSIONS</a></H2><PRE>
<STRONG>key_defined</STRONG> is an <EM>ncurses</EM> extension.
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
Applications employing <EM>ncurses</EM> extensions should condition their use on
the visibility of the <STRONG>NCURSES_VERSION</STRONG> preprocessor macro.
</PRE><H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
Thomas Dickey
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="define_key.3x.html">define_key(3x)</A></STRONG>, <STRONG><A HREF="keybound.3x.html">keybound(3x)</A></STRONG>, <STRONG><A HREF="keyok.3x.html">keyok(3x)</A></STRONG>
ncurses 6.6 2025-10-04 <STRONG><A HREF="key_defined.3x.html">key_defined(3x)</A></STRONG>
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<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
<li><a href="#h2-EXTENSIONS">EXTENSIONS</a></li>
<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
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