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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | EXTENSIONS | PORTABILITY | HISTORY | AUTHORS | SEE ALSO | COLOPHON |
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legacy_coding(3X) Library calls legacy_coding(3X)
use_legacy_coding - override curses locale encoding checks
#include <curses.h>
int use_legacy_coding(int level);
use_legacy_coding, an ncurses extension to the curses library,
permits customiztion of unctrl(3X) behavior, suppressing
isprint(3)-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 level parameter controls the result.
0 The library functions normally, rendering nonprinting
characters as described in unctrl(3X),
1 the library ignores isprint for codes in the range
160-255.
2 the library ignores isprint for codes in the range
128-255. It also modifies the output of unctrl(3X),
showing codes in the range 128-159 as is.
If the curses screen has not been initialized, or the level
parameter is out of range, use_legacy_coding returns ERR.
Otherwise, it returns the previous level.
use_legacy_coding is an ncurses extension.
Applications employing ncurses extensions should condition their
use on the visibility of the NCURSES_VERSION preprocessor macro.
ncurses 5.6 (2006) introduced use_legacy_coding to support
lynx(1)'s font-switching feature.
Thomas Dickey
unctrl(3X)
This page is part of the ncurses (new curses) project.
Information about the project can be found at
⟨https://invisible-island.net/ncurses/ncurses.html⟩. If you have a
bug report for this manual page, send it to bug-ncurses@gnu.org.
This page was obtained from the tarball ncurses-6.6.tar.gz fetched
from ⟨https://ftp.gnu.org/gnu/ncurses/⟩ on 2026-01-16. If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for the
page, or you have corrections or improvements to the information
in this COLOPHON (which is not part of the original manual page),
send a mail to man-pages@man7.org
ncurses @NCURSES_MAJOR@.@NCU... 2024-09-14 legacy_coding(3X)
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HTML rendering created 2026-01-16 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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