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curs_initscr(3X)                                              curs_initscr(3X)

       initscr, newterm, endwin, isendwin, set_term, delscreen - curses screen
       initialization and manipulation routines

       #include <curses.h>

       WINDOW *initscr(void);
       int endwin(void);
       bool isendwin(void);
       SCREEN *newterm(char *type, FILE *outfd, FILE *infd);
       SCREEN *set_term(SCREEN *new);
       void delscreen(SCREEN* sp);

       initscr is normally the first curses routine to call when initializing
       a program.  A few special routines sometimes need to be called before
       it; these are slk_init, filter, ripoffline, use_env.  For multiple-
       terminal applications, newterm may be called before initscr.

       The initscr code determines the terminal type and initializes all
       curses data structures.  initscr also causes the first call to refresh
       to clear the screen.  If errors occur, initscr writes an appropriate
       error message to standard error and exits; otherwise, a pointer is
       returned to stdscr.

       A program that outputs to more than one terminal should use the newterm
       routine for each terminal instead of initscr.  A program that needs to
       inspect capabilities, so it can continue to run in a line-oriented mode
       if the terminal cannot support a screen-oriented program, would also
       use newterm.  The routine newterm should be called once for each
       terminal.  It returns a variable of type SCREEN * which should be saved
       as a reference to that terminal.  The arguments are the type of the
       terminal to be used in place of $TERM, a file pointer for output to the
       terminal, and another file pointer for input from the terminal (if type
       is NULL, $TERM will be used).  The program must also call endwin for
       each terminal being used before exiting from curses.  If newterm is
       called more than once for the same terminal, the first terminal
       referred to must be the last one for which endwin is called.

       A program should always call endwin before exiting or escaping from
       curses mode temporarily.  This routine restores tty modes, moves the
       cursor to the lower left-hand corner of the screen and resets the
       terminal into the proper non-visual mode.  Calling refresh or doupdate
       after a temporary escape causes the program to resume visual mode.

       The isendwin routine returns TRUE if endwin has been called without any
       subsequent calls to wrefresh, and FALSE otherwise.

       The set_term routine is used to switch between different terminals.
       The screen reference new becomes the new current terminal.  The
       previous terminal is returned by the routine.  This is the only routine
       which manipulates SCREEN pointers; all other routines affect only the
       current terminal.

       The delscreen routine frees storage associated with the SCREEN data
       structure.  The endwin routine does not do this, so delscreen should be
       called after endwin if a particular SCREEN is no longer needed.

       endwin returns the integer ERR upon failure and OK upon successful

       Routines that return pointers always return NULL on error.

       X/Open defines no error conditions.  In this implementation endwin
       returns an error if the terminal was not initialized.

       Note that initscr and newterm may be macros.

       These functions are described in the XSI Curses standard, Issue 4.  It
       specifies that portable applications must not call initscr more than

       Old versions of curses, e.g., BSD 4.4, may have returned a null pointer
       from initscr when an error is detected, rather than exiting.  It is
       safe but redundant to check the return value of initscr in XSI Curses.

       curses(3X), curs_kernel(3X), curs_refresh(3X), curs_slk(3X),



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