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