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curs_kernel(3curses)
curs_kernel(3CURSES) Curses Library Functions curs_kernel(3CURSES)
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 routines
SYNOPSIS
cc [ flag ... ] file ... -lcurses [ library ... ]
#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 func‐
tionality. These routines typically are used inside library routines.
The def_prog_mode() and def_shell_mode() routines save the current ter‐
minal 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() routines restore the ter‐
minal to "program" (in curses) or "shell" (out of curses) state. These
are done automatically by endwin() and, after an endwin(), by doup‐
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().
With the getsyx() routine, the current coordinates of the virtual
screen cursor 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 manip‐
ulates 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(3CURSES)) 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 std‐
scr(); 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 col‐
umns 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, nor‐
mal, 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 VALUES
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.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ MT-LevelUnsafe
SEE ALSO
curs_initscr(3CURSES), curs_outopts(3CURSES), curs_refresh(3CURSES),
curs_scr_dump(3CURSES), curs_slk(3CURSES), curses(3CURSES),
attributes(7)
NOTES
The header <curses.h> automatically includes the headers <stdio.h> and
<unctrl.h>.
Note that getsyx() is a macro, so an ampersand (&) is not necessary
before the variables y and x.
Oracle Solaris 11.4 13 Nov 2020 curs_kernel(3CURSES)