ncurses/tinfo/lib_data.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2008,2009 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 1.55 2009/06/07 14:48:25 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_sigwinch */
 118     0,                          /* cleanup_nested */
 119
 120     FALSE,                      /* init_signals */
 121     FALSE,                      /* init_screen */
 122
 123     NULL,                       /* comp_sourcename */
 124     NULL,                       /* comp_termtype */
 125
 126     FALSE,                      /* have_tic_directory */
 127     FALSE,                      /* keep_tic_directory */
 128     TERMINFO,                   /* tic_directory */
 129
 130     NULL,                       /* dbi_list */
 131     0,                          /* dbi_size */
 132
 133     NULL,                       /* first_name */
 134     NULL,                       /* keyname_table */
 135
 136     0,                          /* slk_format */
 137
 138     NULL,                       /* safeprint_buf */
 139     0,                          /* safeprint_used */
 140
 141     TGETENT_0s,                 /* tgetent_cache */
 142     0,                          /* tgetent_index */
 143     0,                          /* tgetent_sequence */
 144
 145 #ifndef USE_SP_WINDOWLIST
 146     0,                          /* _nc_windowlist */
 147 #endif
 148
 149 #if USE_HOME_TERMINFO
 150     NULL,                       /* home_terminfo */
 151 #endif
 152
 153 #if !USE_SAFE_SPRINTF
 154     0,                          /* safeprint_cols */
 155     0,                          /* safeprint_rows */
 156 #endif
 157
 158 #ifdef TRACE
 159     FALSE,                      /* init_trace */
 160     CHARS_0s,                   /* trace_fname */
 161     0,                          /* trace_level */
 162     NULL,                       /* trace_fp */
 163
 164     NULL,                       /* tracearg_buf */
 165     0,                          /* tracearg_used */
 166
 167     NULL,                       /* tracebuf_ptr */
 168     0,                          /* tracebuf_used */
 169
 170     CHARS_0s,                   /* tracechr_buf */
 171
 172     NULL,                       /* tracedmp_buf */
 173     0,                          /* tracedmp_used */
 174
 175     NULL,                       /* tracetry_buf */
 176     0,                          /* tracetry_used */
 177
 178     { CHARS_0s, CHARS_0s },     /* traceatr_color_buf */
 179     0,                          /* traceatr_color_sel */
 180     -1,                         /* traceatr_color_last */
 181 #if !defined(USE_PTHREADS) && USE_REENTRANT
 182     0,                          /* nested_tracef */
 183 #endif
 184 #endif /* TRACE */
 185 #ifdef USE_PTHREADS
 186     PTHREAD_MUTEX_INITIALIZER,  /* mutex_curses */
 187     PTHREAD_MUTEX_INITIALIZER,  /* mutex_tst_tracef */
 188     PTHREAD_MUTEX_INITIALIZER,  /* mutex_tracef */
 189     0,                          /* nested_tracef */
 190     0,                          /* use_pthreads */
 191 #endif
 192 };
 193
 194 #define STACK_FRAME_0   { { 0 }, 0 }
 195 #define STACK_FRAME_0s  { STACK_FRAME_0 }
 196 #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 }
 197
 198 #define RIPOFF_0        { 0,0,0 }
 199 #define RIPOFF_0s       { RIPOFF_0 }
 200
 201 NCURSES_EXPORT_VAR(NCURSES_PRESCREEN) _nc_prescreen = {
 202     TRUE,                       /* use_env */
 203     FALSE,                      /* filter_mode */
 204     A_NORMAL,                   /* previous_attr */
 205 #ifndef USE_SP_RIPOFF
 206     RIPOFF_0s,                  /* ripoff */
 207     NULL,                       /* rsp */
 208 #endif
 209     {                           /* tparm_state */
 210 #ifdef TRACE
 211         NULL,                   /* tname */
 212 #endif
 213         NULL,                   /* tparam_base */
 214
 215         STACK_FRAME_0s,         /* stack */
 216         0,                      /* stack_ptr */
 217
 218         NULL,                   /* out_buff */
 219         0,                      /* out_size */
 220         0,                      /* out_used */
 221
 222         NULL,                   /* fmt_buff */
 223         0,                      /* fmt_size */
 224
 225         NUM_VARS_0s,            /* dynamic_var */
 226         NUM_VARS_0s,            /* static_vars */
 227     },
 228     NULL,                       /* saved_tty */
 229 #if NCURSES_NO_PADDING
 230     FALSE,                      /* flag to set if padding disabled  */
 231 #endif
 232 #if BROKEN_LINKER || USE_REENTRANT
 233     NULL,                       /* real_acs_map */
 234     0,                          /* LINES */
 235     0,                          /* COLS */
 236     8,                          /* TABSIZE */
 237     1000,                       /* ESCDELAY */
 238     0,                          /* cur_term */
 239 #ifdef TRACE
 240     0L,                         /* _outchars */
 241     NULL,                       /* _tputs_trace */
 242 #endif
 243 #endif
 244 };
 245 /* *INDENT-ON* */
 246
 247 /*
 248  * wgetch() and other functions with a WINDOW* parameter may use a SCREEN*
 249  * internally, and it is useful to allow those to be invoked without switching
 250  * SCREEN's, e.g., for multi-threaded applications.
 251  */
 252 NCURSES_EXPORT(SCREEN *)
 253 _nc_screen_of(WINDOW *win)
 254 {
 255     SCREEN *sp = 0;
 256
 257     if (win != 0) {
 258         WINDOWLIST *wp = (WINDOWLIST *) win;
 259         sp = wp->screen;
 260     }
 261     return (sp);
 262 }
 263
 264 /******************************************************************************/
 265 #ifdef USE_PTHREADS
 266 static void
 267 init_global_mutexes(void)
 268 {
 269     static bool initialized = FALSE;
 270
 271     if (!initialized) {
 272         initialized = TRUE;
 273         _nc_mutex_init(&_nc_globals.mutex_curses);
 274         _nc_mutex_init(&_nc_globals.mutex_tst_tracef);
 275         _nc_mutex_init(&_nc_globals.mutex_tracef);
 276     }
 277 }
 278
 279 NCURSES_EXPORT(void)
 280 _nc_init_pthreads(void)
 281 {
 282     if (_nc_use_pthreads)
 283         return;
 284 # if USE_WEAK_SYMBOLS
 285     if ((pthread_mutex_init) == 0)
 286         return;
 287     if ((pthread_mutex_lock) == 0)
 288         return;
 289     if ((pthread_mutex_unlock) == 0)
 290         return;
 291     if ((pthread_mutex_trylock) == 0)
 292         return;
 293     if ((pthread_mutexattr_settype) == 0)
 294         return;
 295 # endif
 296     _nc_use_pthreads = 1;
 297     init_global_mutexes();
 298 }
 299
 300 /*
 301  * Use recursive mutexes if we have them - they're part of Unix98.
 302  * For the cases where we do not, _nc_mutex_trylock() is used to avoid a
 303  * deadlock, at the expense of memory leaks and unexpected failures that
 304  * may not be handled by typical clients.
 305  *
 306  * FIXME - need configure check for PTHREAD_MUTEX_RECURSIVE, define it to
 307  * PTHREAD_MUTEX_NORMAL if not supported.
 308  */
 309 NCURSES_EXPORT(void)
 310 _nc_mutex_init(pthread_mutex_t * obj)
 311 {
 312     pthread_mutexattr_t recattr;
 313
 314     if (_nc_use_pthreads) {
 315         pthread_mutexattr_init(&recattr);
 316         pthread_mutexattr_settype(&recattr, PTHREAD_MUTEX_RECURSIVE);
 317         pthread_mutex_init(obj, &recattr);
 318     }
 319 }
 320
 321 NCURSES_EXPORT(int)
 322 _nc_mutex_lock(pthread_mutex_t * obj)
 323 {
 324     if (_nc_use_pthreads == 0)
 325         return 0;
 326     return pthread_mutex_lock(obj);
 327 }
 328
 329 NCURSES_EXPORT(int)
 330 _nc_mutex_trylock(pthread_mutex_t * obj)
 331 {
 332     if (_nc_use_pthreads == 0)
 333         return 0;
 334     return pthread_mutex_trylock(obj);
 335 }
 336
 337 NCURSES_EXPORT(int)
 338 _nc_mutex_unlock(pthread_mutex_t * obj)
 339 {
 340     if (_nc_use_pthreads == 0)
 341         return 0;
 342     return pthread_mutex_unlock(obj);
 343 }
 344
 345 #if USE_WEAK_SYMBOLS
 346 /*
 347  * NB: sigprocmask(2) is global but pthread_sigmask(3p)
 348  * only for the calling thread.
 349  */
 350 NCURSES_EXPORT(int)
 351 _nc_sigprocmask(int how, const sigset_t * newmask, sigset_t * oldmask)
 352 {
 353     if ((pthread_sigmask))
 354         return pthread_sigmask(how, newmask, oldmask);
 355     else
 356         return sigprocmask(how, newmask, oldmask);
 357 }
 358 #endif
 359 #endif /* USE_PTHREADS */