ncurses 5.9 - patch 20130816
[ncurses.git] / ncurses / tinfo / lib_data.c
1 /****************************************************************************
2  * Copyright (c) 1998-2011,2012 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  *     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 1.65 2012/08/25 18:38:43 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     return ((my_screen = _nc_alloc_screen_sp()) != 0);
98 }
99
100 NCURSES_EXPORT(void)
101 _nc_set_screen(SCREEN *sp)
102 {
103     my_screen = sp;
104 }
105
106 #else
107
108 NCURSES_EXPORT_VAR(SCREEN *) SP = NULL; /* Some linkers require initialized data... */
109 #endif
110 /* *INDENT-OFF* */
111 #define CHARS_0s { '\0' }
112
113 #define TGETENT_0 { 0L, FALSE, NULL, NULL, NULL }
114 #define TGETENT_0s { TGETENT_0, TGETENT_0, TGETENT_0, TGETENT_0 }
115
116 NCURSES_EXPORT_VAR(NCURSES_GLOBALS) _nc_globals = {
117     0,                          /* have_sigtstp */
118     0,                          /* have_sigwinch */
119     0,                          /* cleanup_nested */
120
121     FALSE,                      /* init_signals */
122     FALSE,                      /* init_screen */
123
124     NULL,                       /* comp_sourcename */
125     NULL,                       /* comp_termtype */
126
127     FALSE,                      /* have_tic_directory */
128     FALSE,                      /* keep_tic_directory */
129     0,                          /* tic_directory */
130
131     NULL,                       /* dbi_list */
132     0,                          /* dbi_size */
133
134     NULL,                       /* first_name */
135     NULL,                       /* keyname_table */
136
137     0,                          /* slk_format */
138
139     NULL,                       /* safeprint_buf */
140     0,                          /* safeprint_used */
141
142     TGETENT_0s,                 /* tgetent_cache */
143     0,                          /* tgetent_index */
144     0,                          /* tgetent_sequence */
145
146     0,                          /* dbd_blob */
147     0,                          /* dbd_list */
148     0,                          /* dbd_size */
149     0,                          /* dbd_time */
150     { { 0, 0 } },               /* dbd_vars */
151
152 #ifndef USE_SP_WINDOWLIST
153     0,                          /* _nc_windowlist */
154 #endif
155
156 #if USE_HOME_TERMINFO
157     NULL,                       /* home_terminfo */
158 #endif
159
160 #if !USE_SAFE_SPRINTF
161     0,                          /* safeprint_cols */
162     0,                          /* safeprint_rows */
163 #endif
164
165 #ifdef USE_TERM_DRIVER
166     0,                          /* term_driver */
167 #endif
168
169 #ifdef TRACE
170     FALSE,                      /* init_trace */
171     CHARS_0s,                   /* trace_fname */
172     0,                          /* trace_level */
173     NULL,                       /* trace_fp */
174
175     NULL,                       /* tracearg_buf */
176     0,                          /* tracearg_used */
177
178     NULL,                       /* tracebuf_ptr */
179     0,                          /* tracebuf_used */
180
181     CHARS_0s,                   /* tracechr_buf */
182
183     NULL,                       /* tracedmp_buf */
184     0,                          /* tracedmp_used */
185
186     NULL,                       /* tracetry_buf */
187     0,                          /* tracetry_used */
188
189     { CHARS_0s, CHARS_0s },     /* traceatr_color_buf */
190     0,                          /* traceatr_color_sel */
191     -1,                         /* traceatr_color_last */
192 #if !defined(USE_PTHREADS) && USE_REENTRANT
193     0,                          /* nested_tracef */
194 #endif
195 #endif /* TRACE */
196 #ifdef USE_PTHREADS
197     PTHREAD_MUTEX_INITIALIZER,  /* mutex_curses */
198     PTHREAD_MUTEX_INITIALIZER,  /* mutex_tst_tracef */
199     PTHREAD_MUTEX_INITIALIZER,  /* mutex_tracef */
200     0,                          /* nested_tracef */
201     0,                          /* use_pthreads */
202 #endif
203 #if USE_PTHREADS_EINTR
204     0,                          /* read_thread */
205 #endif
206 };
207
208 #define STACK_FRAME_0   { { 0 }, 0 }
209 #define STACK_FRAME_0s  { STACK_FRAME_0 }
210 #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 }
211
212 #define RIPOFF_0        { 0,0,0 }
213 #define RIPOFF_0s       { RIPOFF_0 }
214
215 NCURSES_EXPORT_VAR(NCURSES_PRESCREEN) _nc_prescreen = {
216     TRUE,                       /* use_env */
217     FALSE,                      /* filter_mode */
218     A_NORMAL,                   /* previous_attr */
219 #ifndef USE_SP_RIPOFF
220     RIPOFF_0s,                  /* ripoff */
221     NULL,                       /* rsp */
222 #endif
223     {                           /* tparm_state */
224 #ifdef TRACE
225         NULL,                   /* tname */
226 #endif
227         NULL,                   /* tparam_base */
228
229         STACK_FRAME_0s,         /* stack */
230         0,                      /* stack_ptr */
231
232         NULL,                   /* out_buff */
233         0,                      /* out_size */
234         0,                      /* out_used */
235
236         NULL,                   /* fmt_buff */
237         0,                      /* fmt_size */
238
239         NUM_VARS_0s,            /* dynamic_var */
240         NUM_VARS_0s,            /* static_vars */
241     },
242     NULL,                       /* saved_tty */
243 #if NCURSES_NO_PADDING
244     FALSE,                      /* flag to set if padding disabled  */
245 #endif
246     0,                          /* _outch */
247 #if BROKEN_LINKER || USE_REENTRANT
248     NULL,                       /* real_acs_map */
249     0,                          /* LINES */
250     0,                          /* COLS */
251     8,                          /* TABSIZE */
252     1000,                       /* ESCDELAY */
253     0,                          /* cur_term */
254 #ifdef TRACE
255     0L,                         /* _outchars */
256     NULL,                       /* _tputs_trace */
257 #endif
258 #endif
259     FALSE,                      /* use_tioctl */
260 };
261 /* *INDENT-ON* */
262
263 /*
264  * wgetch() and other functions with a WINDOW* parameter may use a SCREEN*
265  * internally, and it is useful to allow those to be invoked without switching
266  * SCREEN's, e.g., for multi-threaded applications.
267  */
268 NCURSES_EXPORT(SCREEN *)
269 _nc_screen_of(WINDOW *win)
270 {
271     SCREEN *sp = 0;
272
273     if (win != 0) {
274         sp = WINDOW_EXT(win, screen);
275     }
276     return (sp);
277 }
278
279 /******************************************************************************/
280 #ifdef USE_PTHREADS
281 static void
282 init_global_mutexes(void)
283 {
284     static bool initialized = FALSE;
285
286     if (!initialized) {
287         initialized = TRUE;
288         _nc_mutex_init(&_nc_globals.mutex_curses);
289         _nc_mutex_init(&_nc_globals.mutex_tst_tracef);
290         _nc_mutex_init(&_nc_globals.mutex_tracef);
291     }
292 }
293
294 NCURSES_EXPORT(void)
295 _nc_init_pthreads(void)
296 {
297     if (_nc_use_pthreads)
298         return;
299 # if USE_WEAK_SYMBOLS
300     if ((pthread_mutex_init) == 0)
301         return;
302     if ((pthread_mutex_lock) == 0)
303         return;
304     if ((pthread_mutex_unlock) == 0)
305         return;
306     if ((pthread_mutex_trylock) == 0)
307         return;
308     if ((pthread_mutexattr_settype) == 0)
309         return;
310 # endif
311     _nc_use_pthreads = 1;
312     init_global_mutexes();
313 }
314
315 /*
316  * Use recursive mutexes if we have them - they're part of Unix98.
317  * For the cases where we do not, _nc_mutex_trylock() is used to avoid a
318  * deadlock, at the expense of memory leaks and unexpected failures that
319  * may not be handled by typical clients.
320  *
321  * FIXME - need configure check for PTHREAD_MUTEX_RECURSIVE, define it to
322  * PTHREAD_MUTEX_NORMAL if not supported.
323  */
324 NCURSES_EXPORT(void)
325 _nc_mutex_init(pthread_mutex_t * obj)
326 {
327     pthread_mutexattr_t recattr;
328
329     if (_nc_use_pthreads) {
330         pthread_mutexattr_init(&recattr);
331         pthread_mutexattr_settype(&recattr, PTHREAD_MUTEX_RECURSIVE);
332         pthread_mutex_init(obj, &recattr);
333     }
334 }
335
336 NCURSES_EXPORT(int)
337 _nc_mutex_lock(pthread_mutex_t * obj)
338 {
339     if (_nc_use_pthreads == 0)
340         return 0;
341     return pthread_mutex_lock(obj);
342 }
343
344 NCURSES_EXPORT(int)
345 _nc_mutex_trylock(pthread_mutex_t * obj)
346 {
347     if (_nc_use_pthreads == 0)
348         return 0;
349     return pthread_mutex_trylock(obj);
350 }
351
352 NCURSES_EXPORT(int)
353 _nc_mutex_unlock(pthread_mutex_t * obj)
354 {
355     if (_nc_use_pthreads == 0)
356         return 0;
357     return pthread_mutex_unlock(obj);
358 }
359 #endif /* USE_PTHREADS */
360
361 #if defined(USE_PTHREADS) || USE_PTHREADS_EINTR
362 #if USE_WEAK_SYMBOLS
363 /*
364  * NB: sigprocmask(2) is global but pthread_sigmask(3p)
365  * only for the calling thread.
366  */
367 NCURSES_EXPORT(int)
368 _nc_sigprocmask(int how, const sigset_t * newmask, sigset_t * oldmask)
369 {
370     if ((pthread_sigmask))
371         return pthread_sigmask(how, newmask, oldmask);
372     else
373         return sigprocmask(how, newmask, oldmask);
374 }
375 #endif
376 #endif /* USE_PTHREADS */