curs_scr_dump(3x) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | PORTABILITY | SEE ALSO | COLOPHON

curs_scr_dump(3X)                                       curs_scr_dump(3X)

NAME         top

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

SYNOPSIS         top

       #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         top

   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  ter‐
       minal  currently  has on its screen.  If the data is determined to
       be valid, curses bases its next update of the screen on  this  in‐
       formation  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

       •   if the terminfo capabilities rmcup and nrrmc exist, also

       •   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         top

       All routines return the integer ERR upon failure and OK upon suc‐
       cess.

       X/Open defines no error conditions.  In this implementation, each
       will return an error if the file cannot be opened.

NOTES         top

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

PORTABILITY         top

       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         top

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

COLOPHON         top

       This page is part of the ncurses (new curses) project.  Informa‐
       tion about the project can be found at 
       ⟨https://www.gnu.org/software/ncurses/ncurses.html⟩.  If you have a
       bug report for this manual page, send it to
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                                                        curs_scr_dump(3X)