def_prog_mode, def_shell_mode, reset_prog_mode, reset_shell_mode,
   resetty, savetty, getsyx, setsyx, ripoffline, curs_set, napms - low-
   level curses routines


   #include <curses.h>

   int def_prog_mode(void);
   int def_shell_mode(void);
   int reset_prog_mode(void);
   int reset_shell_mode(void);
   int resetty(void);
   int savetty(void);
   void getsyx(int y, int x);
   void setsyx(int y, int x);
   int ripoffline(int line, int (*init)(WINDOW *, int));
   int curs_set(int visibility);
   int napms(int ms);


   The   following  routines  give  low-level  access  to  various  curses
   capabilities.   These  routines  typically  are  used  inside   library

   def_prog_mode, def_shell_mode
   The def_prog_mode and def_shell_mode routines save the current terminal
   modes as the "program" (in curses) or "shell" (not in curses) state for
   use by the reset_prog_mode and reset_shell_mode routines.  This is done
   automatically by initscr.  There is one such save area for each  screen
   context allocated by newterm().

   reset_prog_mode, reset_shell_mode
   The  reset_prog_mode and reset_shell_mode routines restore the terminal
   to "program" (in curses) or "shell" (out of curses) state.   These  are
   done automatically by endwin and, after an endwin, by doupdate, so they
   normally are not called.

   resetty, savetty
   The resetty and savetty routines save and  restore  the  state  of  the
   terminal  modes.   savetty  saves  the  current  state  in a buffer and
   resetty restores the state to what it was at the last call to savetty.

   The getsyx routine returns  the  current  coordinates  of  the  virtual
   screen  cursor in y and x.  If leaveok is currently TRUE, then -1,-1 is
   returned.  If lines have been removed from the top of the screen, using
   ripoffline,  y  and x include these lines; therefore, y and x should be
   used only as arguments for setsyx.

   The setsyx routine sets the virtual screen cursor to y, x.  If y and  x
   are  both  -1, then leaveok is set.  The two routines getsyx and setsyx
   are designed to be used by a library routine, which manipulates  curses
   windows  but  does  not  want  to  change  the  current position of the
   program's cursor.   The  library  routine  would  call  getsyx  at  the
   beginning, do its manipulation of its own windows, do a wnoutrefresh on
   its windows, call setsyx, and then call doupdate.

   The ripoffline routine  provides  access  to  the  same  facility  that
   slk_init  [see  slk(3NCURSES)]  uses  to reduce the size of the screen.
   ripoffline must be called before  initscr  or  newterm  is  called,  to
   prepare these initial actions:

   ·   If line is positive, a line is removed from the top of stdscr.

   ·   if line is negative, a line is removed from the bottom.

   When  the  resulting initialization is done inside initscr, the routine
   init (supplied by the user) is called with two arguments:

   ·   a window pointer to the one-line window that has been allocated and

   ·   an integer with the number of columns in the window.

   Inside this initialization routine, the  integer  variables  LINES  and
   COLS  (defined  in  <curses.h>)  are  not guaranteed to be accurate and
   wrefresh or doupdate must not be  called.   It  is  allowable  to  call
   wnoutrefresh during the initialization routine.

   ripoffline  can  be  called  up to five times before calling initscr or

   The curs_set routine sets the cursor state  to  invisible,  normal,  or
   very  visible  for visibility equal to 0, 1, or 2 respectively.  If the
   terminal supports the visibility requested, the previous  cursor  state
   is returned; otherwise, ERR is returned.

   The napms routine is used to sleep for ms milliseconds.


   Except for curs_set, these routines always return OK.

   curs_set  returns  the  previous  cursor state, or ERR if the requested
   visibility is not supported.

   X/Open defines no error conditions.  In this implementation

   def_prog_mode, def_shell_mode, reset_prog_mode, reset_shell_mode
        return an error if the terminal was not initialized, or if the I/O
        call to obtain the terminal settings fails.

        returns an error if the maximum number of ripped-off lines exceeds
        the maximum (NRIPS = 5).


   Note that getsyx is a macro, so & is not necessary before the variables
   y and x.

   Older  SVr4  man  pages  warn  that  the  return  value of curs_set "is
   currently incorrect".  This implementation gets it right, but it may be
   unwise to count on the correctness of the return value anywhere else.

   Both ncurses and SVr4 will call curs_set in endwin if curs_set has been
   called to make the cursor other than normal, i.e., either invisible  or
   very  visible.   There  is  no way for ncurses to determine the initial
   cursor state to restore that.


   The functions setsyx and getsyx are not described  in  the  XSI  Curses
   standard, Issue 4.  All other functions are as described in XSI Curses.

   The  SVr4  documentation  describes  setsyx and getsyx as having return
   type int. This is misleading, as they are  macros  with  no  documented
   semantics for the return value.


   ncurses(3NCURSES),         initscr(3NCURSES),        outopts(3NCURSES),
   refresh(3NCURSES),          scr_dump(3NCURSES),          slk(3NCURSES),



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