legacy_coding(3X)

NAME
use_legacy_coding - override curses locale encoding checks

SYNOPSIS
#include <curses.h>

int use_legacy_coding(int level);

DESCRIPTION
use_legacy_coding is an extension to the curses library. It allows the caller to change the result of unctrl(3X), suppressing isprint(3)-based checks within the library that would normally cause nonprinting characters to be rendered in visible form. The alteration affects only eight-bit characters.

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.

RETURN VALUE
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.

EXTENSIONS
use_legacy_coding is an ncurses extension.

PORTABILITY
Applications employing ncurses extensions should condition their use on the visibility of the NCURSES_VERSION preprocessor macro.

HISTORY
ncurses 5.6 (2006) introduced use_legacy_coding to support lynx(1)'s font-switching feature.

AUTHORS
Thomas Dickey

SEE ALSO
unctrl(3X)