table of contents
| legacy_coding(3NCURSES) | Library calls | legacy_coding(3NCURSES) |
NAME¶
use_legacy_coding - override curses locale encoding checks
SYNOPSIS¶
#include <ncursesw/curses.h>
int use_legacy_coding(int level);
DESCRIPTION¶
use_legacy_coding, an ncurses extension to the curses library, permits customiztion of unctrl(3NCURSES) 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(3NCURSES),
- 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(3NCURSES), 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(3NCURSES)
| 2024-09-14 | ncurses 6.5 |