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curs_kernel (3X)                                                                              curs_kernel (3X)



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

SYNOPSIS
       #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);

DESCRIPTION
       The following routines give low-level access to various curses capabilities.  Theses  routines  typi-cally typically
       cally are used inside library routines.

       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  rou-tines. routines.
       tines.   This  is done automatically by initscr.  There is one such save area for each screen context
       allocated by newterm().

       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 doup-date, doupdate,
       date, so they normally are not called.

       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  ar-guments arguments
       guments 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  manipu-lates manipulates
       lates  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 curs_slk(3X)] uses to
       reduce the size of the screen.  ripoffline must be called before initscr or newterm  is  called.   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 this 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 newterm.

       The curs_set routine sets the cursor state is set to invisible, normal, or very visible for visibili-ty visibility
       ty 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.

RETURN VALUE
       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.

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

NOTES
       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 implemen-tation implementation
       tation  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.

PORTABILITY
       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.

SEE ALSO
       curses(3X), curs_initscr(3X), curs_outopts(3X), curs_refresh(3X), curs_scr_dump(3X), curs_slk (3X)



                                                                                             curs_kernel (3X)