MirOS Manual: curs_kernel(3), curs_set(3), def_prog_mode(3), def_shell_mode(3), getsyx(3), napms(3), resetty(3), reset_prog_mode(3), reset_shell_mode(3), ripoffline(3), savetty(3), setsyx(3)


curs_kernel(3)      UNIX Programmer's Manual       curs_kernel(3)

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 typically are used in-
     side 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  routines.  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  doupdate,  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 in-
     clude 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 rou-

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curs_kernel(3)      UNIX Programmer's Manual       curs_kernel(3)

     tines 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 curs_slk(3)] 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  re-
     moved  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 in-
     itscr or newterm.

     The curs_set routine sets the cursor state is set to invisi-
     ble,  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.

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  initial-
               ized,  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).

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curs_kernel(3)      UNIX Programmer's Manual       curs_kernel(3)

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  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 nor-
     mal, 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(3),         curs_initscr(3),         curs_outopts(3),
     curs_refresh(3), curs_scr_dump(3), curs_slk(3)

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