The following routines give low-level access to various
- curses capabilities. Theses routines typically are used
+ curses capabilities. 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().
+ "shell" (not in curses) state for use by the re-
+ set_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
- include these lines; therefore, y and x should be used
- only as arguments for setsyx.
+ 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-
- tines getsyx and setsyx are designed to be used by a
- library routine, which manipulates curses windows but does
+ tines getsyx and setsyx are designed to be used by a li-
+ brary 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
+ cursor. The library routine would call getsyx at the be-
+ ginning, 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 facil-
- ity that slk_init [see curs_slk(3x)] uses to reduce the
+
+
+ The ripoffline routine provides access to the same facili-
+ ty 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 win-
- dow that has been allocated and an integer with the number
- of columns in the window. Inside this initialization rou-
- tine, 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.
+ initscr or newterm is called, to prepare these initial ac-
+ tions:
+
+ 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 bot-
+ tom.
+
+ 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 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 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 re-
+ quested, the previous cursor state is returned; otherwise,
+ ERR is returned.
+
+
+
+ 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 implementa-
+ tion
-
-
NOTES
+ 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).
+
+
+
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 hav-
ing return type int. This is misleading, as they are
- macros with no documented semantics for the return value.
+ macros with no documented semantics for the return value.
-