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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-ter-
       minal applications, newterm may be called before	initscr.

       The initscr code	determines the terminal	type and initializes all curs-
       es 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	termi-
       nal.  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	termi-
       nal,  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 ter-
       minal into the proper non-visual	mode.  Calling refresh or doupdate af-
       ter 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	previ-
       ous 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 com-

       Routines	that return pointers always return NULL	on error.

       X/Open  defines no error	conditions.  In	this implementation endwin re-
       turns 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.

       If the TERM variable is missing or empty, initscr uses the  value  "un-
       known", which normally corresponds to a terminal	entry with the generic
       (gn) capability.	 Generic entries are  detected	by  setupterm(3X)  and
       cannot  be  used	 for full-screen operation.  Other implementations may
       handle a	missing/empty TERM variable differently.

       curses(3X), curs_kernel(3X), curs_refresh(3X), curs_slk(3X),  curs_ter-
       minfo(3X), curs_util(3X), curs_variables(3X).



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