curs_kernel(3X) MISCELLANEOUS LIBRARY FUNCTIONS curs_kernel(3X)
NAME
curs_kernel: def_prog_mode, def_shell_mode,
reset_prog_mode, reset_shell_mode, resetty, savetty, getsyx,
setsyx, ripoffline, curs_set, napms - low-level curses rou-
tines
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);
int getsyx(int y, int x);
int 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 functionality. Theses 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. The reset_prog_mode and reset_shell_mode rou-
tines 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 nor-
mally 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. With the getsyx
routine, the current coordinates of the virtual screen cur-
sor are returned 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. With the setsyx routine, the virtual screen
cursor is set 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
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curs_kernel(3X) MISCELLANEOUS LIBRARY FUNCTIONS curs_kernel(3X)
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. With
the curs_set routine, 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 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.
NOTES
The header file <curses.h> automatically includes the header
files <stdio.h> and <unctrl.h>.
Note that getsyx is a macro, so & is not necessary before
the variables y and x.
SEE ALSO
curses(3X), curs_initscr(3X), curs_outopts(3X),
curs_refresh(3X), curs_scr_dump(3X), curs_slk(3X).
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