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download PDF document: curs_kernel.3x.pdf

curs_kernel(3X) curs_kernel(3X)
NAME 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 #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);
void getsyx(int y, int x); void 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 capabilities. These routines typically are used inside library routines.
def_prog_mode, def_shell_mode 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.
reset_prog_mode, reset_shell_mode 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.
resetty, savetty 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.
getsyx 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.
Few applications will use this feature, most use getyx instead.
setsyx
Few applications will use this feature, most use wmove instead.
ripoffline 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 prepare these initial actions:
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.
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.
curs_set 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.
napms 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.
X/Open defines no error conditions. In this implementation
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).
NOTES 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 currently incorrect". This implementation gets it right, but it may be
PORTABILITY The virtual screen 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 type int. This is misleading, as they are macros with no documented semantics for the return value.
SEE ALSO curses(3X), curs_initscr(3X), curs_outopts(3X), curs_refresh(3X), curs_scr_dump(3X), curs_slk(3X), curs_variables(3X).
curs_kernel(3X)