- The following routines give low-level access to various curses capabil-
+ The following routines give low-level access to various curses capabil-
ities. These routines typically 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 routines. This is done
- automatically by initscr. There is one such save area for each screen
- context allocated by newterm.
+ 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(3X) and, after an endwin, by doupdate, so
+ 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(3x) and, after an endwin, by doupdate, so
they normally are not called.
- The resetty and savetty routines save and restore the state of the ter-
- minal 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 resetty and savetty routines save and restore the state of the ter-
+ minal 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
+ 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.
+ ripoffline, y and x include these lines; therefore, y and x should be
+ used only as arguments for setsyx.
- Few applications will use this feature, most use getyx instead.
+ Few applications will use this feature, most use getyx instead.
- The setsyx routine sets the virtualscreen 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
+ The setsyx routine sets the virtualscreen 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 pro-
- gram's cursor. The library routine would call getsyx at the beginning,
- do its manipulation of its own windows, do a wnoutrefresh on its win-
- dows, call setsyx, and then call doupdate.
+ gram's cursor. The library routine would call getsyx at the beginning,
+ do its manipulation of its own windows, do a wnoutrefresh on its win-
+ dows, call setsyx, and then call doupdate.
- Few applications will use this feature, most use wmove instead.
+ Few applications will use this feature, most use wmove instead.
- 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, to pre-
+ 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, to pre-
pare these initial actions:
- o If line is positive, a line is removed from the top of stdscr.
+ o If line is positive, a line is removed from the top of stdscr.
- o if line is negative, a line is removed from the bottom.
+ o 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:
+ When the resulting initialization is done inside initscr, the routine
+ init (supplied by the user) is called with two arguments:
- o a window pointer to the one-line window that has been allocated and
+ o a window pointer to the one-line window that has been allocated and
- o an integer with the number of columns in the window.
+ o 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 wre-
- fresh or doupdate must not be called. It is allowable to call wnoutre-
- fresh during the initialization routine.
+ Inside this initialization routine, the integer variables LINES and
+ COLS (defined in <curses.h>) are not guaranteed to be accurate and wre-
+ fresh or doupdate must not be called. It is allowable to call wnoutre-
+ fresh during the initialization routine.
- ripoffline can be called up to five times before calling initscr or
- newterm.
+ ripoffline can be called up to five times before calling initscr or
+ newterm.
- 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 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.
- Except for curs_set, these routines always return OK.
+ 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.
+ 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
+ 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
+ ripoffline
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.
+ 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 cur-
+ Older SVr4 man pages warn that the return value of curs_set "is cur-
rently 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
+ 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 virtualscreen functions setsyx and getsyx are not described in the
+ The virtualscreen 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
+ 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.