Provided by: ncurses-doc_5.9-4_all bug


       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

       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 completion.

       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 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.


       ncurses(3NCURSES),  kernel(3NCURSES),  refresh(3NCURSES),  slk(3NCURSES),  util(3NCURSES),