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(const  char  *type,  FILE  *outfd,   FILE
       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 initial-
       izes 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 ter-
       minal 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

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

       The  set_term  routine is used to switch between different
       terminals.  The screen reference new becomes the new  cur-
       rent  terminal.   The previous terminal is returned by the
       routine.  This  is  the  only  routine  which  manipulates
       SCREEN  pointers;  all other routines affect only the cur-
       rent 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 par-
       ticular SCREEN is no longer needed.


       endwin  returns  the  integer ERR upon failure and OK upon
       successful completion.

       Routines that return pointers always return NULL on error.


       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 once.

       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), curs_util(3x)

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