ncurses/tinfo/lib_data.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2016,2017 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 1.75 2017/08/04 08:59:48 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 #if NO_LEAKS
 201     FALSE,                      /* leak_checking */
 202 #endif
 203 #ifdef USE_PTHREADS
 204     PTHREAD_MUTEX_INITIALIZER,  /* mutex_curses */
 205     PTHREAD_MUTEX_INITIALIZER,  /* mutex_prescreen */
 206     PTHREAD_MUTEX_INITIALIZER,  /* mutex_screen */
 207     PTHREAD_MUTEX_INITIALIZER,  /* mutex_update */
 208     PTHREAD_MUTEX_INITIALIZER,  /* mutex_tst_tracef */
 209     PTHREAD_MUTEX_INITIALIZER,  /* mutex_tracef */
 210     0,                          /* nested_tracef */
 211     0,                          /* use_pthreads */
 212 #endif
 213 #if USE_PTHREADS_EINTR
 214     0,                          /* read_thread */
 215 #endif
 216 #if USE_WIDEC_SUPPORT
 217     CHARS_0s,                   /* key_name */
 218 #endif
 219 };
 220
 221 #define STACK_FRAME_0   { { 0 }, 0 }
 222 #define STACK_FRAME_0s  { STACK_FRAME_0 }
 223 #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 }
 224
 225 #define RIPOFF_0        { 0,0,0 }
 226 #define RIPOFF_0s       { RIPOFF_0 }
 227
 228 NCURSES_EXPORT_VAR(NCURSES_PRESCREEN) _nc_prescreen = {
 229     NULL,                       /* allocated */
 230     TRUE,                       /* use_env */
 231     FALSE,                      /* filter_mode */
 232     A_NORMAL,                   /* previous_attr */
 233 #ifndef USE_SP_RIPOFF
 234     RIPOFF_0s,                  /* ripoff */
 235     NULL,                       /* rsp */
 236 #endif
 237     {                           /* tparm_state */
 238 #ifdef TRACE
 239         NULL,                   /* tname */
 240 #endif
 241         NULL,                   /* tparam_base */
 242
 243         STACK_FRAME_0s,         /* stack */
 244         0,                      /* stack_ptr */
 245
 246         NULL,                   /* out_buff */
 247         0,                      /* out_size */
 248         0,                      /* out_used */
 249
 250         NULL,                   /* fmt_buff */
 251         0,                      /* fmt_size */
 252
 253         NUM_VARS_0s,            /* dynamic_var */
 254         NUM_VARS_0s,            /* static_vars */
 255     },
 256     NULL,                       /* saved_tty */
 257 #if NCURSES_NO_PADDING
 258     FALSE,                      /* flag to set if padding disabled  */
 259 #endif
 260     0,                          /* _outch */
 261 #if BROKEN_LINKER || USE_REENTRANT
 262     NULL,                       /* real_acs_map */
 263     0,                          /* LINES */
 264     0,                          /* COLS */
 265     8,                          /* TABSIZE */
 266     1000,                       /* ESCDELAY */
 267     0,                          /* cur_term */
 268 #ifdef TRACE
 269     0L,                         /* _outchars */
 270     NULL,                       /* _tputs_trace */
 271 #endif
 272 #endif
 273     FALSE,                      /* use_tioctl */
 274 };
 275 /* *INDENT-ON* */
 276
 277 /*
 278  * wgetch() and other functions with a WINDOW* parameter may use a SCREEN*
 279  * internally, and it is useful to allow those to be invoked without switching
 280  * SCREEN's, e.g., for multi-threaded applications.
 281  */
 282 NCURSES_EXPORT(SCREEN *)
 283 _nc_screen_of(WINDOW *win)
 284 {
 285     SCREEN *sp = 0;
 286
 287     if (win != 0) {
 288         sp = WINDOW_EXT(win, screen);
 289     }
 290     return (sp);
 291 }
 292
 293 /******************************************************************************/
 294 #ifdef USE_PTHREADS
 295 static void
 296 init_global_mutexes(void)
 297 {
 298     static bool initialized = FALSE;
 299
 300     if (!initialized) {
 301         initialized = TRUE;
 302         _nc_mutex_init(&_nc_globals.mutex_curses);
 303         _nc_mutex_init(&_nc_globals.mutex_prescreen);
 304         _nc_mutex_init(&_nc_globals.mutex_screen);
 305         _nc_mutex_init(&_nc_globals.mutex_update);
 306         _nc_mutex_init(&_nc_globals.mutex_tst_tracef);
 307         _nc_mutex_init(&_nc_globals.mutex_tracef);
 308     }
 309 }
 310
 311 NCURSES_EXPORT(void)
 312 _nc_init_pthreads(void)
 313 {
 314     if (_nc_use_pthreads)
 315         return;
 316 # if USE_WEAK_SYMBOLS
 317     if ((pthread_mutex_init) == 0)
 318         return;
 319     if ((pthread_mutex_lock) == 0)
 320         return;
 321     if ((pthread_mutex_unlock) == 0)
 322         return;
 323     if ((pthread_mutex_trylock) == 0)
 324         return;
 325     if ((pthread_mutexattr_settype) == 0)
 326         return;
 327 # endif
 328     _nc_use_pthreads = 1;
 329     init_global_mutexes();
 330 }
 331
 332 /*
 333  * Use recursive mutexes if we have them - they're part of Unix98.
 334  * For the cases where we do not, _nc_mutex_trylock() is used to avoid a
 335  * deadlock, at the expense of memory leaks and unexpected failures that
 336  * may not be handled by typical clients.
 337  *
 338  * FIXME - need configure check for PTHREAD_MUTEX_RECURSIVE, define it to
 339  * PTHREAD_MUTEX_NORMAL if not supported.
 340  */
 341 NCURSES_EXPORT(void)
 342 _nc_mutex_init(pthread_mutex_t * obj)
 343 {
 344     pthread_mutexattr_t recattr;
 345
 346     if (_nc_use_pthreads) {
 347         pthread_mutexattr_init(&recattr);
 348         pthread_mutexattr_settype(&recattr, PTHREAD_MUTEX_RECURSIVE);
 349         pthread_mutex_init(obj, &recattr);
 350     }
 351 }
 352
 353 NCURSES_EXPORT(int)
 354 _nc_mutex_lock(pthread_mutex_t * obj)
 355 {
 356     if (_nc_use_pthreads == 0)
 357         return 0;
 358     return pthread_mutex_lock(obj);
 359 }
 360
 361 NCURSES_EXPORT(int)
 362 _nc_mutex_trylock(pthread_mutex_t * obj)
 363 {
 364     if (_nc_use_pthreads == 0)
 365         return 0;
 366     return pthread_mutex_trylock(obj);
 367 }
 368
 369 NCURSES_EXPORT(int)
 370 _nc_mutex_unlock(pthread_mutex_t * obj)
 371 {
 372     if (_nc_use_pthreads == 0)
 373         return 0;
 374     return pthread_mutex_unlock(obj);
 375 }
 376 #endif /* USE_PTHREADS */
 377
 378 #if defined(USE_PTHREADS) || USE_PTHREADS_EINTR
 379 #if USE_WEAK_SYMBOLS
 380 /*
 381  * NB: sigprocmask(2) is global but pthread_sigmask(3p)
 382  * only for the calling thread.
 383  */
 384 NCURSES_EXPORT(int)
 385 _nc_sigprocmask(int how, const sigset_t * newmask, sigset_t * oldmask)
 386 {
 387     if ((pthread_sigmask))
 388         return pthread_sigmask(how, newmask, oldmask);
 389     else
 390         return (sigprocmask) (how, newmask, oldmask);
 391 }
 392 #endif
 393 #endif /* USE_PTHREADS */