1/****************************************************************************
2 * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc.              *
3 *                                                                          *
4 * Permission is hereby granted, free of charge, to any person obtaining a  *
5 * copy of this software and associated documentation files (the            *
6 * "Software"), to deal in the Software without restriction, including      *
7 * without limitation the rights to use, copy, modify, merge, publish,      *
8 * distribute, distribute with modifications, sublicense, and/or sell       *
9 * copies of the Software, and to permit persons to whom the Software is    *
10 * furnished to do so, subject to the following conditions:                 *
11 *                                                                          *
12 * The above copyright notice and this permission notice shall be included  *
13 * in all copies or substantial portions of the Software.                   *
14 *                                                                          *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
22 *                                                                          *
23 * Except as contained in this notice, the name(s) of the above copyright   *
24 * holders shall not be used in advertising or otherwise to promote the     *
25 * sale, use or other dealings in this Software without prior written       *
26 * authorization.                                                           *
27 ****************************************************************************/
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 1.52 2008/08/23 22:16:15 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 */
50#if USE_REENTRANT
51NCURSES_EXPORT(WINDOW *)
52NCURSES_PUBLIC_VAR(stdscr) (void)
53{
54    return SP ? SP->_stdscr : 0;
55}
56NCURSES_EXPORT(WINDOW *)
57NCURSES_PUBLIC_VAR(curscr) (void)
58{
59    return SP ? SP->_curscr : 0;
60}
61NCURSES_EXPORT(WINDOW *)
62NCURSES_PUBLIC_VAR(newscr) (void)
63{
64    return SP ? SP->_newscr : 0;
65}
66#else
67NCURSES_EXPORT_VAR(WINDOW *) stdscr = 0;
68NCURSES_EXPORT_VAR(WINDOW *) curscr = 0;
69NCURSES_EXPORT_VAR(WINDOW *) newscr = 0;
70#endif
71
72NCURSES_EXPORT_VAR(SCREEN *) _nc_screen_chain = 0;
73
74/*
75 * The variable 'SP' will be defined as a function on systems that cannot link
76 * data-only modules, since it is used in a lot of places within ncurses and we
77 * cannot guarantee that any application will use any particular function.  We
78 * put the WINDOW variables in this module, because it appears that any
79 * application that uses them will also use 'SP'.
80 *
81 * This module intentionally does not reference other ncurses modules, to avoid
82 * module coupling that increases the size of the executable.
83 */
84#if BROKEN_LINKER
85static SCREEN *my_screen;
86
87NCURSES_EXPORT(SCREEN *)
88_nc_screen(void)
89{
90    return my_screen;
91}
92
93NCURSES_EXPORT(int)
94_nc_alloc_screen(void)
95{
96    return ((my_screen = typeCalloc(SCREEN, 1)) != 0);
97}
98
99NCURSES_EXPORT(void)
100_nc_set_screen(SCREEN *sp)
101{
102    my_screen = sp;
103}
104
105#else
106NCURSES_EXPORT_VAR(SCREEN *) SP = NULL; /* Some linkers require initialized data... */
107#endif
108/* *INDENT-OFF* */
109#define CHARS_0s { '\0' }
110
111#define TGETENT_0 { 0L, FALSE, NULL, NULL, NULL }
112#define TGETENT_0s { TGETENT_0, TGETENT_0, TGETENT_0, TGETENT_0 }
113
114NCURSES_EXPORT_VAR(NCURSES_GLOBALS) _nc_globals = {
115    0,				/* have_sigwinch */
116    0,				/* cleanup_nested */
117
118    FALSE,			/* init_signals */
119    FALSE,			/* init_screen */
120
121    NULL,			/* comp_sourcename */
122    NULL,			/* comp_termtype */
123
124    FALSE,			/* have_tic_directory */
125    FALSE,			/* keep_tic_directory */
126    TERMINFO,			/* tic_directory */
127
128    NULL,			/* dbi_list */
129    0,				/* dbi_size */
130
131    NULL,			/* first_name */
132    NULL,			/* keyname_table */
133
134    0,				/* slk_format */
135
136    NULL,			/* safeprint_buf */
137    0,				/* safeprint_used */
138
139    TGETENT_0s,			/* tgetent_cache */
140    0,				/* tgetent_index */
141    0,				/* tgetent_sequence */
142
143    0,				/* _nc_windowlist */
144
145#if USE_HOME_TERMINFO
146    NULL,			/* home_terminfo */
147#endif
148
149#if !USE_SAFE_SPRINTF
150    0,				/* safeprint_cols */
151    0,				/* safeprint_rows */
152#endif
153
154#ifdef TRACE
155    FALSE,			/* init_trace */
156    CHARS_0s,			/* trace_fname */
157    0,				/* trace_level */
158    NULL,			/* trace_fp */
159
160    NULL,			/* tracearg_buf */
161    0,				/* tracearg_used */
162
163    NULL,			/* tracebuf_ptr */
164    0,				/* tracebuf_used */
165
166    CHARS_0s,			/* tracechr_buf */
167
168    NULL,			/* tracedmp_buf */
169    0,				/* tracedmp_used */
170
171    NULL,			/* tracetry_buf */
172    0,				/* tracetry_used */
173
174    { CHARS_0s, CHARS_0s },	/* traceatr_color_buf */
175    0,				/* traceatr_color_sel */
176    -1,				/* traceatr_color_last */
177
178#endif /* TRACE */
179#ifdef USE_PTHREADS
180    PTHREAD_MUTEX_INITIALIZER,	/* mutex_curses */
181    PTHREAD_MUTEX_INITIALIZER,	/* mutex_tst_tracef */
182    PTHREAD_MUTEX_INITIALIZER,	/* mutex_tracef */
183    0,				/* nested_tracef */
184    0,				/* use_pthreads */
185#endif
186};
187
188#define STACK_FRAME_0	{ { 0 }, 0 }
189#define STACK_FRAME_0s	{ STACK_FRAME_0 }
190#define NUM_VARS_0s	{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }
191
192#define RIPOFF_0	{ 0,0,0 }
193#define RIPOFF_0s	{ RIPOFF_0 }
194
195NCURSES_EXPORT_VAR(NCURSES_PRESCREEN) _nc_prescreen = {
196    TRUE,			/* use_env */
197    FALSE,			/* filter_mode */
198    A_NORMAL,			/* previous_attr */
199    RIPOFF_0s,			/* ripoff */
200    NULL,			/* rsp */
201    {				/* tparm_state */
202#ifdef TRACE
203	NULL,			/* tname */
204#endif
205	NULL,			/* tparam_base */
206
207	STACK_FRAME_0s,		/* stack */
208	0,			/* stack_ptr */
209
210	NULL,			/* out_buff */
211	0,			/* out_size */
212	0,			/* out_used */
213
214	NULL,			/* fmt_buff */
215	0,			/* fmt_size */
216
217	NUM_VARS_0s,		/* dynamic_var */
218	NUM_VARS_0s,		/* static_vars */
219    },
220    NULL,			/* saved_tty */
221#if NCURSES_NO_PADDING
222    FALSE,			/* flag to set if padding disabled  */
223#endif
224#if BROKEN_LINKER || USE_REENTRANT
225    NULL,			/* real_acs_map */
226    0,				/* LINES */
227    0,				/* COLS */
228    0,				/* cur_term */
229#ifdef TRACE
230    0L,				/* _outchars */
231    NULL,			/* _tputs_trace */
232#endif
233#endif
234};
235/* *INDENT-ON* */
236
237/******************************************************************************/
238#ifdef USE_PTHREADS
239static void
240init_global_mutexes(void)
241{
242    static bool initialized = FALSE;
243
244    if (!initialized) {
245	initialized = TRUE;
246	_nc_mutex_init(&_nc_globals.mutex_curses);
247	_nc_mutex_init(&_nc_globals.mutex_tst_tracef);
248	_nc_mutex_init(&_nc_globals.mutex_tracef);
249    }
250}
251
252NCURSES_EXPORT(void)
253_nc_init_pthreads(void)
254{
255    if (_nc_use_pthreads)
256	return;
257# if USE_WEAK_SYMBOLS
258    if ((pthread_mutex_init) == 0)
259	return;
260    if ((pthread_mutex_lock) == 0)
261	return;
262    if ((pthread_mutex_unlock) == 0)
263	return;
264    if ((pthread_mutex_trylock) == 0)
265	return;
266    if ((pthread_mutexattr_settype) == 0)
267	return;
268# endif
269    _nc_use_pthreads = 1;
270    init_global_mutexes();
271}
272
273/*
274 * Use recursive mutexes if we have them - they're part of Unix98.
275 * For the cases where we do not, _nc_mutex_trylock() is used to avoid a
276 * deadlock, at the expense of memory leaks and unexpected failures that
277 * may not be handled by typical clients.
278 *
279 * FIXME - need configure check for PTHREAD_MUTEX_RECURSIVE, define it to
280 * PTHREAD_MUTEX_NORMAL if not supported.
281 */
282NCURSES_EXPORT(void)
283_nc_mutex_init(pthread_mutex_t * obj)
284{
285    pthread_mutexattr_t recattr;
286
287    if (_nc_use_pthreads) {
288	pthread_mutexattr_init(&recattr);
289	pthread_mutexattr_settype(&recattr, PTHREAD_MUTEX_RECURSIVE);
290	pthread_mutex_init(obj, &recattr);
291    }
292}
293
294NCURSES_EXPORT(int)
295_nc_mutex_lock(pthread_mutex_t * obj)
296{
297    if (_nc_use_pthreads == 0)
298	return 0;
299    return pthread_mutex_lock(obj);
300}
301
302NCURSES_EXPORT(int)
303_nc_mutex_trylock(pthread_mutex_t * obj)
304{
305    if (_nc_use_pthreads == 0)
306	return 0;
307    return pthread_mutex_trylock(obj);
308}
309
310NCURSES_EXPORT(int)
311_nc_mutex_unlock(pthread_mutex_t * obj)
312{
313    if (_nc_use_pthreads == 0)
314	return 0;
315    return pthread_mutex_unlock(obj);
316}
317
318#if USE_WEAK_SYMBOLS
319/*
320 * NB: sigprocmask(2) is global but pthread_sigmask(3p)
321 * only for the calling thread.
322 */
323NCURSES_EXPORT(int)
324_nc_sigprocmask(int how, const sigset_t * newmask, sigset_t * oldmask)
325{
326    if ((pthread_sigmask))
327	return pthread_sigmask(how, newmask, oldmask);
328    else
329	return sigprocmask(how, newmask, oldmask);
330}
331#endif
332#endif /* USE_PTHREADS */
333