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+.\"***************************************************************************
+.\" Copyright 2020-2021,2022 Thomas E. Dickey                                *
+.\" Copyright 2005-2016,2017 Free Software Foundation, Inc.                  *
+.\"                                                                          *
+.\" Permission is hereby granted, free of charge, to any person obtaining a  *
+.\" copy of this software and associated documentation files (the            *
+.\" "Software"), to deal in the Software without restriction, including      *
+.\" without limitation the rights to use, copy, modify, merge, publish,      *
+.\" distribute, distribute with modifications, sublicense, and/or sell       *
+.\" copies of the Software, and to permit persons to whom the Software is    *
+.\" furnished to do so, subject to the following conditions:                 *
+.\"                                                                          *
+.\" The above copyright notice and this permission notice shall be included  *
+.\" in all copies or substantial portions of the Software.                   *
+.\"                                                                          *
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
+.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
+.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
+.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
+.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
+.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
+.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
+.\"                                                                          *
+.\" Except as contained in this notice, the name(s) of the above copyright   *
+.\" holders shall not be used in advertising or otherwise to promote the     *
+.\" sale, use or other dealings in this Software without prior written       *
+.\" authorization.                                                           *
+.\"***************************************************************************
+.\"
+.\" Author: Thomas E. Dickey
+.\"
+.\" $Id: legacy_coding.3,v 1.2 2023/10/17 09:52:08 nicm Exp $
+.TH legacy_coding 3 2022-02-12 "ncurses 6.4" "Library calls"
+.SH NAME
+\fBuse_legacy_coding\fP \- override locale-encoding checks
+.SH SYNOPSIS
+\fB#include <curses.h>\fP
+.sp
+\fBint use_legacy_coding(int \fIlevel\fB);\fR
+.SH DESCRIPTION
+The \fBuse_legacy_coding\fP function is an extension to the curses library.
+It allows the caller to change the result of \fBunctrl\fP,
+and suppress related checks within the library that would normally
+cause nonprinting characters to be rendered in visible form.
+This affects only 8-bit characters.
+.PP
+The \fIlevel\fP parameter controls the result:
+.RS
+.TP 5
+0
+the library functions normally,
+rendering nonprinting characters as described in \fBunctrl\fP.
+.TP
+1
+the library ignores \fBisprintf\fP for codes in the range 160-255.
+.TP
+2
+the library ignores \fBisprintf\fP for codes in the range 128-255.
+It also modifies the output of \fBunctrl\fP, showing codes in the
+range 128-159 as is.
+.RE
+.SH RETURN VALUE
+If the screen has not been initialized,
+or the \fIlevel\fP parameter is out of range,
+the function returns \fBERR\fP.
+Otherwise, it returns the previous level: \fB0\fP, \fB1\fP or \fB2\fP.
+.SH PORTABILITY
+This routine is specific to ncurses.
+It was not supported on Version 7, BSD or System V implementations.
+It is recommended that any code depending on ncurses extensions
+be conditioned using NCURSES_VERSION.
+.SH SEE ALSO
+\fBunctrl\fP(3).
+.SH AUTHOR
+Thomas Dickey (to support lynx's font-switching feature).