lib_data.c revision 166124 
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2 * Copyright (c) 1998-2000,2005 Free Software Foundation, Inc.              *
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14 *                                                                          *
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28
29/****************************************************************************
30 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
31 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
32 *     and: Thomas E. Dickey                        1996-on                 *
33 ****************************************************************************/
34
35/*
36**	lib_data.c
37**
38**	Common data that may/may not be allocated, but is referenced globally
39**
40*/
41
42#include <curses.priv.h>
43
44MODULE_ID("$Id: lib_data.c,v 1.17 2005/01/22 17:39:22 tom Exp $")
45
46/*
47 * OS/2's native linker complains if we don't initialize public data when
48 * constructing a dll (reported by J.J.G.Ripoll).
49 */
50NCURSES_EXPORT_VAR(WINDOW *) stdscr = 0;
51NCURSES_EXPORT_VAR(WINDOW *) curscr = 0;
52NCURSES_EXPORT_VAR(WINDOW *) newscr = 0;
53
54NCURSES_EXPORT_VAR(SCREEN *) _nc_screen_chain = 0;
55
56/*
57 * The variable 'SP' will be defined as a function on systems that cannot link
58 * data-only modules, since it is used in a lot of places within ncurses and we
59 * cannot guarantee that any application will use any particular function.  We
60 * put the WINDOW variables in this module, because it appears that any
61 * application that uses them will also use 'SP'.
62 *
63 * This module intentionally does not reference other ncurses modules, to avoid
64 * module coupling that increases the size of the executable.
65 */
66#if BROKEN_LINKER
67static SCREEN *my_screen;
68
69NCURSES_EXPORT(SCREEN *)
70_nc_screen(void)
71{
72    return my_screen;
73}
74
75NCURSES_EXPORT(int)
76_nc_alloc_screen(void)
77{
78    return ((my_screen = typeCalloc(SCREEN, 1)) != 0);
79}
80
81NCURSES_EXPORT(void)
82_nc_set_screen(SCREEN *sp)
83{
84    my_screen = sp;
85}
86
87#else
88NCURSES_EXPORT_VAR(SCREEN *) SP = NULL; /* Some linkers require initialized data... */
89#endif
90