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curs_scr_dump 3x



curs_scr_dump(3x)                                     curs_scr_dump(3x)




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

       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 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 da-
       ta 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 or a system call to share the screen with  another
       process  which  has done a scr_dump after its endwin call.
       The data is declared invalid if the terminfo  capabilities
       rmcup and nrrmc exist; also if the terminal has been writ-
       ten 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)].


RETURN VALUE

       All  routines  return  the integer ERR upon failure and OK
       upon success.

       X/Open defines no error conditions.  In  this  implementa-
       tion,  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 func-
       tions (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), system(3)



                                                      curs_scr_dump(3x)

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