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* @Id: legacy_coding.3x,v 1.32 2024/09/14 20:06:50 tom Exp @
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<H1 class="no-header">legacy_coding 3x 2024-09-14 ncurses 6.6 Library calls</H1>
<PRE>
<STRONG><A HREF="legacy_coding.3x.html">legacy_coding(3x)</A></STRONG> Library calls <STRONG><A HREF="legacy_coding.3x.html">legacy_coding(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>use_legacy_coding</STRONG> - override <EM>curses</EM> locale encoding checks
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>int</STRONG> <STRONG>use_legacy_coding(int</STRONG> <EM>level</EM><STRONG>);</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
<STRONG>use_legacy_coding</STRONG>, an <EM>ncurses</EM> extension to the <EM>curses</EM> library, permits
customiztion of <STRONG><A HREF="unctrl.3x.html">unctrl(3x)</A></STRONG> behavior, suppressing <STRONG>isprint(3)</STRONG>-based
checks within the library that would normally cause nonprinting
characters to be rendered in visible form. The alteration affects only
byte-wide characters with the most significant bit set.
The <EM>level</EM> parameter controls the result.
<STRONG>0</STRONG> The library functions normally, rendering nonprinting
characters as described in <STRONG><A HREF="unctrl.3x.html">unctrl(3x)</A></STRONG>,
<STRONG>1</STRONG> the library ignores <EM>isprint</EM> for codes in the range 160-255.
<STRONG>2</STRONG> the library ignores <EM>isprint</EM> for codes in the range 128-255.
It also modifies the output of <STRONG><A HREF="unctrl.3x.html">unctrl(3x)</A></STRONG>, showing codes in
the range 128-159 as is.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
If the <EM>curses</EM> screen has not been initialized, or the <EM>level</EM> parameter
is out of range, <STRONG>use_legacy_coding</STRONG> returns <STRONG>ERR</STRONG>. Otherwise, it returns
the previous level.
</PRE><H2><a name="h2-EXTENSIONS">EXTENSIONS</a></H2><PRE>
<STRONG>use_legacy_coding</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-HISTORY">HISTORY</a></H2><PRE>
<EM>ncurses</EM> 5.6 (2006) introduced <EM>use</EM><STRONG>_</STRONG><EM>legacy</EM><STRONG>_</STRONG><EM>coding</EM> to support <STRONG>lynx(1)</STRONG>'s
font-switching feature.
</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="unctrl.3x.html">unctrl(3x)</A></STRONG>
ncurses 6.6 2024-09-14 <STRONG><A HREF="legacy_coding.3x.html">legacy_coding(3x)</A></STRONG>
</PRE>
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