legacy_coding(3x) — Linux manual page

legacy_coding(3X)                                      legacy_coding(3X)

NAME

       use_legacy_coding - override locale-encoding checks

SYNOPSIS

       #include <curses.h>

       int use_legacy_coding(int level);

DESCRIPTION

       The use_legacy_coding function is an extension to the curses
       library.  It allows the caller to change the result of unctrl,
       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.

       The level parameter controls the result:

              0    the library functions normally, rendering nonprinting
                   characters as described in unctrl.

              1    the library ignores isprintf for codes in the range
                   160-255.

              2    the library ignores isprintf for codes in the range
                   128-255.  It also modifies the output of unctrl,
                   showing codes in the range 128-159 as is.

RETURN VALUE

       If the screen has not been initialized, or the level parameter is
       out of range, the function returns ERR.  Otherwise, it returns
       the previous level: 0, 1 or 2.

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.

SEE ALSO

       unctrl(3X).

AUTHOR

       Thomas Dickey (to support lynx's font-switching feature).

COLOPHON

       This page is part of the ncurses (new curses) project.
       Information about the project can be found at 
       ⟨https://www.gnu.org/software/ncurses/ncurses.html⟩.  If you have
       a bug report for this manual page, send it to
       bug-ncurses-request@gnu.org.  This page was obtained from the
       project's upstream Git mirror of the CVS repository
       ⟨https://github.com/mirror/ncurses.git⟩ on 2024-06-14.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2023-03-12.)  If you discover any rendering
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       (which is not part of the original manual page), send a mail to
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                                                       legacy_coding(3X)