curs_scr_dump(3x) Library calls curs_scr_dump(3x)
scr_dump, scr_restore, scr_init, scr_set - read/write a curses screen
from/to a file
#include <curses.h>
int scr_dump(const char *filename);
int scr_restore(const char *filename);
int scr_init(const char *filename);
int scr_set(const char *filename);
The scr_dump routine dumps the current contents of the virtual screen
to the file filename.
The scr_restore routine sets the virtual screen to the contents of
filename, which must have been written using scr_dump. The next call
to doupdate restores the physical screen to the way it looked in the
dump file.
The scr_init routine reads in the contents of filename and uses them to
initialize the curses data structures about what the terminal currently
has on its screen. If the data is determined to be valid, curses bases
its next update of the screen on this information rather than clearing
the screen and starting from scratch. scr_init is used after
initscr(3x) or a system(3) call to share the screen with another
process which has done a scr_dump after its endwin(3x) call. The data
is declared invalid
o if the terminfo capabilities rmcup and nrrmc exist, also
o if the terminal has been written to since the preceding scr_dump
call.
The scr_set routine is a combination of scr_restore and scr_init. It
tells the program that the information in filename is what is currently
on the screen, and also what the program wants on the screen. This can
be thought of as a screen inheritance function.
To read (write) a window from (to) a file, use the getwin and putwin
routines [see curs_util(3x)].
These routines return the integer ERR upon failure and OK upon success.
X/Open defines no error conditions. In this implementation, each will
return an error if the file cannot be opened.
Note that scr_init, scr_set, and scr_restore may be macros.
These functions are described in the XSI Curses standard, Issue 4,
which adds const qualifiers to the arguments.
The SVr4 docs merely say under scr_init that the dump data is also
considered invalid "if the time-stamp of the tty is old" but do not
define "old".
curses(3x), curs_initscr(3x), curs_refresh(3x), curs_util(3x),
system(3), scr_dump(5)
ncurses 6.4 2023-12-16 curs_scr_dump(3x)