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legacy_coding(3x)

legacy_coding(3x)                Library calls               legacy_coding(3x)

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(3X)  behavior,  suppressing   isprint(3)-based
       checks within the library that would normally cause nonprinting charac‐
       ters 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 char‐
                   acters 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


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       box; cbp-1 | cbp-1 l | l .  ATTRIBUTE TYPE ATTRIBUTE VALUE = Availabil‐
       ity   library/ncurses = Stability Uncommitted

SEE ALSO
       unctrl(3X)



NOTES
       Source code for open source software components in Oracle  Solaris  can
       be found at https://www.oracle.com/downloads/opensource/solaris-source-
       code-downloads.html.

       This software was built from source available at:
       https://github.com/oracle/solaris-userland

       The original community source was downloaded from:
       https://invisible-mirror.net/archives/ncurses/cur‐
       rent/ncurses-6.5-20250614.tgz

       Further information about this software can be found on the open source
       community website at https://invisible-island.net/ncurses/.

ncurses 6.5                       2024-09-14                 legacy_coding(3x)
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