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 ncurses routines

SYNOPSIS
#include <ncurses.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 ncurses capabilities. 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 ncurses) or "shell" (not in ncurses) 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 terminal to "program" (in ncurses) or "shell" (out of ncurses) 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. 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 manipulates ncurses 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 <ncurses.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 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
Note that getsyx is a macro, so & is not necessary before the variables y and x. The 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.

SEE ALSO
ncurses(3X), curs_initscr(3X), curs_outopts(3X), curs_refresh(3X), curs_scr_dump(3X), curs_slk(3X)