ncurses/tinfo/lib_data.c

   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
  44 MODULE_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
  51 NCURSES_EXPORT(WINDOW *)
  52 NCURSES_PUBLIC_VAR(stdscr) (void)
  53 {
  54     return SP ? SP->_stdscr : 0;
  55 }
  56 NCURSES_EXPORT(WINDOW *)
  57 NCURSES_PUBLIC_VAR(curscr) (void)
  58 {
  59     return SP ? SP->_curscr : 0;
  60 }
  61 NCURSES_EXPORT(WINDOW *)
  62 NCURSES_PUBLIC_VAR(newscr) (void)
  63 {
  64     return SP ? SP->_newscr : 0;
  65 }
  66 #else
  67 NCURSES_EXPORT_VAR(WINDOW *) stdscr = 0;
  68 NCURSES_EXPORT_VAR(WINDOW *) curscr = 0;
  69 NCURSES_EXPORT_VAR(WINDOW *) newscr = 0;
  70 #endif
  71
  72 NCURSES_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
  85 static SCREEN *my_screen;
  86
  87 NCURSES_EXPORT(SCREEN *)
  88 _nc_screen(void)
  89 {
  90     return my_screen;
  91 }
  92
  93 NCURSES_EXPORT(int)
  94 _nc_alloc_screen(void)
  95 {
  96     return ((my_screen = typeCalloc(SCREEN, 1)) != 0);
  97 }
  98
  99 NCURSES_EXPORT(void)
 100 _nc_set_screen(SCREEN *sp)
 101 {
 102     my_screen = sp;
 103 }
 104
 105 #else
 106 NCURSES_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
 114 NCURSES_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
 195 NCURSES_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
 239 static void
 240 init_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
 252 NCURSES_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  */
 282 NCURSES_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
 294 NCURSES_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
 302 NCURSES_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
 310 NCURSES_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  */
 323 NCURSES_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 */