ncurses 6.0 - patch 20170401
[ncurses.git] / ncurses / tinfo / lib_data.c
1 /****************************************************************************
2  * Copyright (c) 1998-2016,2017 Free Software Foundation, Inc.              *
3  *                                                                          *
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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.                               *
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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  *     and: Juergen Pfeifer                                                 *
34  ****************************************************************************/
35
36 /*
37 **      lib_data.c
38 **
39 **      Common data that may/may not be allocated, but is referenced globally
40 **
41 */
42
43 #include <curses.priv.h>
44
45 MODULE_ID("$Id: lib_data.c,v 1.71 2017/03/31 17:06:34 tom Exp $")
46
47 /*
48  * OS/2's native linker complains if we don't initialize public data when
49  * constructing a dll (reported by J.J.G.Ripoll).
50  */
51 #if USE_REENTRANT
52 NCURSES_EXPORT(WINDOW *)
53 NCURSES_PUBLIC_VAR(stdscr) (void)
54 {
55     return CURRENT_SCREEN ? StdScreen(CURRENT_SCREEN) : 0;
56 }
57 NCURSES_EXPORT(WINDOW *)
58 NCURSES_PUBLIC_VAR(curscr) (void)
59 {
60     return CURRENT_SCREEN ? CurScreen(CURRENT_SCREEN) : 0;
61 }
62 NCURSES_EXPORT(WINDOW *)
63 NCURSES_PUBLIC_VAR(newscr) (void)
64 {
65     return CURRENT_SCREEN ? NewScreen(CURRENT_SCREEN) : 0;
66 }
67 #else
68 NCURSES_EXPORT_VAR(WINDOW *) stdscr = 0;
69 NCURSES_EXPORT_VAR(WINDOW *) curscr = 0;
70 NCURSES_EXPORT_VAR(WINDOW *) newscr = 0;
71 #endif
72
73 NCURSES_EXPORT_VAR(SCREEN *) _nc_screen_chain = 0;
74
75 /*
76  * The variable 'SP' will be defined as a function on systems that cannot link
77  * data-only modules, since it is used in a lot of places within ncurses and we
78  * cannot guarantee that any application will use any particular function.  We
79  * put the WINDOW variables in this module, because it appears that any
80  * application that uses them will also use 'SP'.
81  *
82  * This module intentionally does not reference other ncurses modules, to avoid
83  * module coupling that increases the size of the executable.
84  */
85 #if BROKEN_LINKER
86 static SCREEN *my_screen;
87
88 NCURSES_EXPORT(SCREEN *)
89 _nc_screen(void)
90 {
91     return my_screen;
92 }
93
94 NCURSES_EXPORT(int)
95 _nc_alloc_screen(void)
96 {
97     my_screen = _nc_alloc_screen_sp();
98     T(("_nc_alloc_screen_sp %p", my_screen));
99     return (my_screen != 0);
100 }
101
102 NCURSES_EXPORT(void)
103 _nc_set_screen(SCREEN *sp)
104 {
105     my_screen = sp;
106 }
107
108 #else
109
110 NCURSES_EXPORT_VAR(SCREEN *) SP = NULL; /* Some linkers require initialized data... */
111 #endif
112 /* *INDENT-OFF* */
113 #define CHARS_0s { '\0' }
114
115 #define TGETENT_0 { 0L, FALSE, NULL, NULL, NULL }
116 #define TGETENT_0s { TGETENT_0, TGETENT_0, TGETENT_0, TGETENT_0 }
117
118 NCURSES_EXPORT_VAR(NCURSES_GLOBALS) _nc_globals = {
119     0,                          /* have_sigtstp */
120     0,                          /* have_sigwinch */
121     0,                          /* cleanup_nested */
122
123     FALSE,                      /* init_signals */
124     FALSE,                      /* init_screen */
125
126     NULL,                       /* comp_sourcename */
127     NULL,                       /* comp_termtype */
128
129     FALSE,                      /* have_tic_directory */
130     FALSE,                      /* keep_tic_directory */
131     0,                          /* tic_directory */
132
133     NULL,                       /* dbi_list */
134     0,                          /* dbi_size */
135
136     NULL,                       /* first_name */
137     NULL,                       /* keyname_table */
138     0,                          /* init_keyname */
139
140     0,                          /* slk_format */
141
142     NULL,                       /* safeprint_buf */
143     0,                          /* safeprint_used */
144
145     TGETENT_0s,                 /* tgetent_cache */
146     0,                          /* tgetent_index */
147     0,                          /* tgetent_sequence */
148
149     0,                          /* dbd_blob */
150     0,                          /* dbd_list */
151     0,                          /* dbd_size */
152     0,                          /* dbd_time */
153     { { 0, 0 } },               /* dbd_vars */
154
155 #ifndef USE_SP_WINDOWLIST
156     0,                          /* _nc_windowlist */
157 #endif
158
159 #if USE_HOME_TERMINFO
160     NULL,                       /* home_terminfo */
161 #endif
162
163 #if !USE_SAFE_SPRINTF
164     0,                          /* safeprint_cols */
165     0,                          /* safeprint_rows */
166 #endif
167
168 #ifdef USE_TERM_DRIVER
169     0,                          /* term_driver */
170 #endif
171
172 #ifdef TRACE
173     FALSE,                      /* trace_opened */
174     CHARS_0s,                   /* trace_fname */
175     0,                          /* trace_level */
176     NULL,                       /* trace_fp */
177     -1,                         /* trace_fd */
178
179     NULL,                       /* tracearg_buf */
180     0,                          /* tracearg_used */
181
182     NULL,                       /* tracebuf_ptr */
183     0,                          /* tracebuf_used */
184
185     CHARS_0s,                   /* tracechr_buf */
186
187     NULL,                       /* tracedmp_buf */
188     0,                          /* tracedmp_used */
189
190     NULL,                       /* tracetry_buf */
191     0,                          /* tracetry_used */
192
193     { CHARS_0s, CHARS_0s },     /* traceatr_color_buf */
194     0,                          /* traceatr_color_sel */
195     -1,                         /* traceatr_color_last */
196 #if !defined(USE_PTHREADS) && USE_REENTRANT
197     0,                          /* nested_tracef */
198 #endif
199 #endif /* TRACE */
200 #ifdef USE_PTHREADS
201     PTHREAD_MUTEX_INITIALIZER,  /* mutex_curses */
202     PTHREAD_MUTEX_INITIALIZER,  /* mutex_tst_tracef */
203     PTHREAD_MUTEX_INITIALIZER,  /* mutex_tracef */
204     0,                          /* nested_tracef */
205     0,                          /* use_pthreads */
206 #endif
207 #if USE_PTHREADS_EINTR
208     0,                          /* read_thread */
209 #endif
210 #if USE_WIDEC_SUPPORT
211     CHARS_0s,                   /* key_name */
212 #endif
213 };
214
215 #define STACK_FRAME_0   { { 0 }, 0 }
216 #define STACK_FRAME_0s  { STACK_FRAME_0 }
217 #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 }
218
219 #define RIPOFF_0        { 0,0,0 }
220 #define RIPOFF_0s       { RIPOFF_0 }
221
222 NCURSES_EXPORT_VAR(NCURSES_PRESCREEN) _nc_prescreen = {
223     TRUE,                       /* use_env */
224     FALSE,                      /* filter_mode */
225     A_NORMAL,                   /* previous_attr */
226 #ifndef USE_SP_RIPOFF
227     RIPOFF_0s,                  /* ripoff */
228     NULL,                       /* rsp */
229 #endif
230     {                           /* tparm_state */
231 #ifdef TRACE
232         NULL,                   /* tname */
233 #endif
234         NULL,                   /* tparam_base */
235
236         STACK_FRAME_0s,         /* stack */
237         0,                      /* stack_ptr */
238
239         NULL,                   /* out_buff */
240         0,                      /* out_size */
241         0,                      /* out_used */
242
243         NULL,                   /* fmt_buff */
244         0,                      /* fmt_size */
245
246         NUM_VARS_0s,            /* dynamic_var */
247         NUM_VARS_0s,            /* static_vars */
248     },
249     NULL,                       /* saved_tty */
250 #if NCURSES_NO_PADDING
251     FALSE,                      /* flag to set if padding disabled  */
252 #endif
253     0,                          /* _outch */
254 #if BROKEN_LINKER || USE_REENTRANT
255     NULL,                       /* real_acs_map */
256     0,                          /* LINES */
257     0,                          /* COLS */
258     8,                          /* TABSIZE */
259     1000,                       /* ESCDELAY */
260     0,                          /* cur_term */
261 #ifdef TRACE
262     0L,                         /* _outchars */
263     NULL,                       /* _tputs_trace */
264 #endif
265 #endif
266     FALSE,                      /* use_tioctl */
267 };
268 /* *INDENT-ON* */
269
270 /*
271  * wgetch() and other functions with a WINDOW* parameter may use a SCREEN*
272  * internally, and it is useful to allow those to be invoked without switching
273  * SCREEN's, e.g., for multi-threaded applications.
274  */
275 NCURSES_EXPORT(SCREEN *)
276 _nc_screen_of(WINDOW *win)
277 {
278     SCREEN *sp = 0;
279
280     if (win != 0) {
281         sp = WINDOW_EXT(win, screen);
282     }
283     return (sp);
284 }
285
286 /******************************************************************************/
287 #ifdef USE_PTHREADS
288 static void
289 init_global_mutexes(void)
290 {
291     static bool initialized = FALSE;
292
293     if (!initialized) {
294         initialized = TRUE;
295         _nc_mutex_init(&_nc_globals.mutex_curses);
296         _nc_mutex_init(&_nc_globals.mutex_tst_tracef);
297         _nc_mutex_init(&_nc_globals.mutex_tracef);
298     }
299 }
300
301 NCURSES_EXPORT(void)
302 _nc_init_pthreads(void)
303 {
304     if (_nc_use_pthreads)
305         return;
306 # if USE_WEAK_SYMBOLS
307     if ((pthread_mutex_init) == 0)
308         return;
309     if ((pthread_mutex_lock) == 0)
310         return;
311     if ((pthread_mutex_unlock) == 0)
312         return;
313     if ((pthread_mutex_trylock) == 0)
314         return;
315     if ((pthread_mutexattr_settype) == 0)
316         return;
317 # endif
318     _nc_use_pthreads = 1;
319     init_global_mutexes();
320 }
321
322 /*
323  * Use recursive mutexes if we have them - they're part of Unix98.
324  * For the cases where we do not, _nc_mutex_trylock() is used to avoid a
325  * deadlock, at the expense of memory leaks and unexpected failures that
326  * may not be handled by typical clients.
327  *
328  * FIXME - need configure check for PTHREAD_MUTEX_RECURSIVE, define it to
329  * PTHREAD_MUTEX_NORMAL if not supported.
330  */
331 NCURSES_EXPORT(void)
332 _nc_mutex_init(pthread_mutex_t * obj)
333 {
334     pthread_mutexattr_t recattr;
335
336     if (_nc_use_pthreads) {
337         pthread_mutexattr_init(&recattr);
338         pthread_mutexattr_settype(&recattr, PTHREAD_MUTEX_RECURSIVE);
339         pthread_mutex_init(obj, &recattr);
340     }
341 }
342
343 NCURSES_EXPORT(int)
344 _nc_mutex_lock(pthread_mutex_t * obj)
345 {
346     if (_nc_use_pthreads == 0)
347         return 0;
348     return pthread_mutex_lock(obj);
349 }
350
351 NCURSES_EXPORT(int)
352 _nc_mutex_trylock(pthread_mutex_t * obj)
353 {
354     if (_nc_use_pthreads == 0)
355         return 0;
356     return pthread_mutex_trylock(obj);
357 }
358
359 NCURSES_EXPORT(int)
360 _nc_mutex_unlock(pthread_mutex_t * obj)
361 {
362     if (_nc_use_pthreads == 0)
363         return 0;
364     return pthread_mutex_unlock(obj);
365 }
366 #endif /* USE_PTHREADS */
367
368 #if defined(USE_PTHREADS) || USE_PTHREADS_EINTR
369 #if USE_WEAK_SYMBOLS
370 /*
371  * NB: sigprocmask(2) is global but pthread_sigmask(3p)
372  * only for the calling thread.
373  */
374 NCURSES_EXPORT(int)
375 _nc_sigprocmask(int how, const sigset_t * newmask, sigset_t * oldmask)
376 {
377     if ((pthread_sigmask))
378         return pthread_sigmask(how, newmask, oldmask);
379     else
380         return (sigprocmask) (how, newmask, oldmask);
381 }
382 #endif
383 #endif /* USE_PTHREADS */