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curs_scr_dump(3)                                              curs_scr_dump(3)




NAME

       scr_dump, scr_restore, scr_init, scr_set - read (write) a curses screen
       from (to) a file


SYNOPSIS

       #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);


DESCRIPTION

   scr_dump
       The scr_dump routine dumps the current contents of the virtual screen to
       the file filename.

   scr_restore
       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.

   scr_init
       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.

   scr_set
       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)].


RETURN VALUE

       All 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.


NOTES

       Note that scr_init, scr_set, and scr_restore may be macros.


PORTABILITY

       The XSI Curses standard, Issue 4, describes these functions (adding the
       const qualifiers).

       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".


SEE ALSO

       curses(3X), curs_initscr(3X), curs_refresh(3X), curs_util(3X),
       scr_dump(5), system(3)



                                                               curs_scr_dump(3)

ncurses 6.4 - Generated Fri Jan 6 09:07:37 CST 2023
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