glib/gmessages.c

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GLib Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 /*
  28  * MT safe
  29  */
  30
  31 #include "config.h"
  32
  33 #include <stdlib.h>
  34 #include <stdarg.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37 #ifdef HAVE_UNISTD_H
  38 #include <unistd.h>
  39 #endif
  40 #include <signal.h>
  41 #include <locale.h>
  42 #include <errno.h>
  43
  44 #ifdef G_OS_WIN32
  45 #include <process.h>            /* For getpid() */
  46 #include <io.h>
  47 #  define STRICT                /* Strict typing, please */
  48 #  define _WIN32_WINDOWS 0x0401 /* to get IsDebuggerPresent */
  49 #  include <windows.h>
  50 #  undef STRICT
  51 #endif
  52
  53 #include "gmessages.h"
  54
  55 #include "gbacktrace.h"
  56 #include "gconvert.h"
  57 #include "gdebug.h"
  58 #include "gmem.h"
  59 #include "gprintfint.h"
  60 #include "gtestutils.h"
  61 #include "gthread.h"
  62 #include "gthreadprivate.h"
  63 #include "gstrfuncs.h"
  64 #include "gstring.h"
  65
  66
  67 /* --- structures --- */
  68 typedef struct _GLogDomain      GLogDomain;
  69 typedef struct _GLogHandler     GLogHandler;
  70 struct _GLogDomain
  71 {
  72   gchar         *log_domain;
  73   GLogLevelFlags fatal_mask;
  74   GLogHandler   *handlers;
  75   GLogDomain    *next;
  76 };
  77 struct _GLogHandler
  78 {
  79   guint          id;
  80   GLogLevelFlags log_level;
  81   GLogFunc       log_func;
  82   gpointer       data;
  83   GLogHandler   *next;
  84 };
  85
  86
  87 /* --- variables --- */
  88 static GMutex        *g_messages_lock = NULL;
  89 static GLogDomain    *g_log_domains = NULL;
  90 static GLogLevelFlags g_log_always_fatal = G_LOG_FATAL_MASK;
  91 static GPrintFunc     glib_print_func = NULL;
  92 static GPrintFunc     glib_printerr_func = NULL;
  93 static GPrivate      *g_log_depth = NULL;
  94 static GLogLevelFlags g_log_msg_prefix = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_DEBUG;
  95 static GLogFunc       default_log_func = g_log_default_handler;
  96 static gpointer       default_log_data = NULL;
  97 static GTestLogFatalFunc fatal_log_func = NULL;
  98 static gpointer          fatal_log_data;
  99
 100 /* --- functions --- */
 101 #ifdef G_OS_WIN32
 102 #  define STRICT
 103 #  include <windows.h>
 104 #  undef STRICT
 105 static gboolean win32_keep_fatal_message = FALSE;
 106
 107 /* This default message will usually be overwritten. */
 108 /* Yes, a fixed size buffer is bad. So sue me. But g_error() is never
 109  * called with huge strings, is it?
 110  */
 111 static gchar  fatal_msg_buf[1000] = "Unspecified fatal error encountered, aborting.";
 112 static gchar *fatal_msg_ptr = fatal_msg_buf;
 113
 114 #undef write
 115 static inline int
 116 dowrite (int          fd,
 117          const void  *buf,
 118          unsigned int len)
 119 {
 120   if (win32_keep_fatal_message)
 121     {
 122       memcpy (fatal_msg_ptr, buf, len);
 123       fatal_msg_ptr += len;
 124       *fatal_msg_ptr = 0;
 125       return len;
 126     }
 127
 128   write (fd, buf, len);
 129
 130   return len;
 131 }
 132 #define write(fd, buf, len) dowrite(fd, buf, len)
 133
 134 #endif
 135
 136 static void
 137 write_string (int          fd,
 138               const gchar *string)
 139 {
 140   write (fd, string, strlen (string));
 141 }
 142
 143 static void
 144 g_messages_prefixed_init (void)
 145 {
 146   static gboolean initialized = FALSE;
 147
 148   if (!initialized)
 149     {
 150       const gchar *val;
 151
 152       initialized = TRUE;
 153       val = g_getenv ("G_MESSAGES_PREFIXED");
 154
 155       if (val)
 156         {
 157           const GDebugKey keys[] = {
 158             { "error", G_LOG_LEVEL_ERROR },
 159             { "critical", G_LOG_LEVEL_CRITICAL },
 160             { "warning", G_LOG_LEVEL_WARNING },
 161             { "message", G_LOG_LEVEL_MESSAGE },
 162             { "info", G_LOG_LEVEL_INFO },
 163             { "debug", G_LOG_LEVEL_DEBUG }
 164           };
 165
 166           g_log_msg_prefix = g_parse_debug_string (val, keys, G_N_ELEMENTS (keys));
 167         }
 168     }
 169 }
 170
 171 static GLogDomain*
 172 g_log_find_domain_L (const gchar *log_domain)
 173 {
 174   register GLogDomain *domain;
 175
 176   domain = g_log_domains;
 177   while (domain)
 178     {
 179       if (strcmp (domain->log_domain, log_domain) == 0)
 180         return domain;
 181       domain = domain->next;
 182     }
 183   return NULL;
 184 }
 185
 186 static GLogDomain*
 187 g_log_domain_new_L (const gchar *log_domain)
 188 {
 189   register GLogDomain *domain;
 190
 191   domain = g_new (GLogDomain, 1);
 192   domain->log_domain = g_strdup (log_domain);
 193   domain->fatal_mask = G_LOG_FATAL_MASK;
 194   domain->handlers = NULL;
 195
 196   domain->next = g_log_domains;
 197   g_log_domains = domain;
 198
 199   return domain;
 200 }
 201
 202 static void
 203 g_log_domain_check_free_L (GLogDomain *domain)
 204 {
 205   if (domain->fatal_mask == G_LOG_FATAL_MASK &&
 206       domain->handlers == NULL)
 207     {
 208       register GLogDomain *last, *work;
 209
 210       last = NULL;
 211
 212       work = g_log_domains;
 213       while (work)
 214         {
 215           if (work == domain)
 216             {
 217               if (last)
 218                 last->next = domain->next;
 219               else
 220                 g_log_domains = domain->next;
 221               g_free (domain->log_domain);
 222               g_free (domain);
 223               break;
 224             }
 225           last = work;
 226           work = last->next;
 227         }
 228     }
 229 }
 230
 231 static GLogFunc
 232 g_log_domain_get_handler_L (GLogDomain  *domain,
 233                             GLogLevelFlags log_level,
 234                             gpointer    *data)
 235 {
 236   if (domain && log_level)
 237     {
 238       register GLogHandler *handler;
 239
 240       handler = domain->handlers;
 241       while (handler)
 242         {
 243           if ((handler->log_level & log_level) == log_level)
 244             {
 245               *data = handler->data;
 246               return handler->log_func;
 247             }
 248           handler = handler->next;
 249         }
 250     }
 251
 252   *data = default_log_data;
 253   return default_log_func;
 254 }
 255
 256 GLogLevelFlags
 257 g_log_set_always_fatal (GLogLevelFlags fatal_mask)
 258 {
 259   GLogLevelFlags old_mask;
 260
 261   /* restrict the global mask to levels that are known to glib
 262    * since this setting applies to all domains
 263    */
 264   fatal_mask &= (1 << G_LOG_LEVEL_USER_SHIFT) - 1;
 265   /* force errors to be fatal */
 266   fatal_mask |= G_LOG_LEVEL_ERROR;
 267   /* remove bogus flag */
 268   fatal_mask &= ~G_LOG_FLAG_FATAL;
 269
 270   g_mutex_lock (g_messages_lock);
 271   old_mask = g_log_always_fatal;
 272   g_log_always_fatal = fatal_mask;
 273   g_mutex_unlock (g_messages_lock);
 274
 275   return old_mask;
 276 }
 277
 278 GLogLevelFlags
 279 g_log_set_fatal_mask (const gchar   *log_domain,
 280                       GLogLevelFlags fatal_mask)
 281 {
 282   GLogLevelFlags old_flags;
 283   register GLogDomain *domain;
 284
 285   if (!log_domain)
 286     log_domain = "";
 287
 288   /* force errors to be fatal */
 289   fatal_mask |= G_LOG_LEVEL_ERROR;
 290   /* remove bogus flag */
 291   fatal_mask &= ~G_LOG_FLAG_FATAL;
 292
 293   g_mutex_lock (g_messages_lock);
 294
 295   domain = g_log_find_domain_L (log_domain);
 296   if (!domain)
 297     domain = g_log_domain_new_L (log_domain);
 298   old_flags = domain->fatal_mask;
 299
 300   domain->fatal_mask = fatal_mask;
 301   g_log_domain_check_free_L (domain);
 302
 303   g_mutex_unlock (g_messages_lock);
 304
 305   return old_flags;
 306 }
 307
 308 guint
 309 g_log_set_handler (const gchar   *log_domain,
 310                    GLogLevelFlags log_levels,
 311                    GLogFunc       log_func,
 312                    gpointer       user_data)
 313 {
 314   static guint handler_id = 0;
 315   GLogDomain *domain;
 316   GLogHandler *handler;
 317
 318   g_return_val_if_fail ((log_levels & G_LOG_LEVEL_MASK) != 0, 0);
 319   g_return_val_if_fail (log_func != NULL, 0);
 320
 321   if (!log_domain)
 322     log_domain = "";
 323
 324   handler = g_new (GLogHandler, 1);
 325
 326   g_mutex_lock (g_messages_lock);
 327
 328   domain = g_log_find_domain_L (log_domain);
 329   if (!domain)
 330     domain = g_log_domain_new_L (log_domain);
 331
 332   handler->id = ++handler_id;
 333   handler->log_level = log_levels;
 334   handler->log_func = log_func;
 335   handler->data = user_data;
 336   handler->next = domain->handlers;
 337   domain->handlers = handler;
 338
 339   g_mutex_unlock (g_messages_lock);
 340
 341   return handler_id;
 342 }
 343
 344 GLogFunc
 345 g_log_set_default_handler (GLogFunc log_func,
 346                            gpointer user_data)
 347 {
 348   GLogFunc old_log_func;
 349
 350   g_mutex_lock (g_messages_lock);
 351   old_log_func = default_log_func;
 352   default_log_func = log_func;
 353   default_log_data = user_data;
 354   g_mutex_unlock (g_messages_lock);
 355
 356   return old_log_func;
 357 }
 358
 359 /**
 360  * g_test_log_set_fatal_handler:
 361  * @log_func: the log handler function.
 362  * @user_data: data passed to the log handler.
 363  *
 364  * Installs a non-error fatal log handler which can be
 365  * used to decide whether log messages which are counted
 366  * as fatal abort the program.
 367  *
 368  * The use case here is that you are running a test case
 369  * that depends on particular libraries or circumstances
 370  * and cannot prevent certain known critical or warning
 371  * messages. So you install a handler that compares the
 372  * domain and message to precisely not abort in such a case.
 373  *
 374  * Note that the handler is reset at the beginning of
 375  * any test case, so you have to set it inside each test
 376  * function which needs the special behavior.
 377  *
 378  * This handler has no effect on g_error messages.
 379  *
 380  * Since: 2.22
 381  **/
 382 void
 383 g_test_log_set_fatal_handler (GTestLogFatalFunc log_func,
 384                               gpointer          user_data)
 385 {
 386   g_mutex_lock (g_messages_lock);
 387   fatal_log_func = log_func;
 388   fatal_log_data = user_data;
 389   g_mutex_unlock (g_messages_lock);
 390 }
 391
 392 void
 393 g_log_remove_handler (const gchar *log_domain,
 394                       guint        handler_id)
 395 {
 396   register GLogDomain *domain;
 397
 398   g_return_if_fail (handler_id > 0);
 399
 400   if (!log_domain)
 401     log_domain = "";
 402
 403   g_mutex_lock (g_messages_lock);
 404   domain = g_log_find_domain_L (log_domain);
 405   if (domain)
 406     {
 407       GLogHandler *work, *last;
 408
 409       last = NULL;
 410       work = domain->handlers;
 411       while (work)
 412         {
 413           if (work->id == handler_id)
 414             {
 415               if (last)
 416                 last->next = work->next;
 417               else
 418                 domain->handlers = work->next;
 419               g_log_domain_check_free_L (domain);
 420               g_mutex_unlock (g_messages_lock);
 421               g_free (work);
 422               return;
 423             }
 424           last = work;
 425           work = last->next;
 426         }
 427     }
 428   g_mutex_unlock (g_messages_lock);
 429   g_warning ("%s: could not find handler with id `%d' for domain \"%s\"",
 430              G_STRLOC, handler_id, log_domain);
 431 }
 432
 433 void
 434 g_logv (const gchar   *log_domain,
 435         GLogLevelFlags log_level,
 436         const gchar   *format,
 437         va_list        args1)
 438 {
 439   gboolean was_fatal = (log_level & G_LOG_FLAG_FATAL) != 0;
 440   gboolean was_recursion = (log_level & G_LOG_FLAG_RECURSION) != 0;
 441   gint i;
 442
 443   log_level &= G_LOG_LEVEL_MASK;
 444   if (!log_level)
 445     return;
 446
 447   for (i = g_bit_nth_msf (log_level, -1); i >= 0; i = g_bit_nth_msf (log_level, i))
 448     {
 449       register GLogLevelFlags test_level;
 450
 451       test_level = 1 << i;
 452       if (log_level & test_level)
 453         {
 454           guint depth = GPOINTER_TO_UINT (g_private_get (g_log_depth));
 455           GLogDomain *domain;
 456           GLogFunc log_func;
 457           GLogLevelFlags domain_fatal_mask;
 458           gpointer data = NULL;
 459           gboolean masquerade_fatal = FALSE;
 460
 461           if (was_fatal)
 462             test_level |= G_LOG_FLAG_FATAL;
 463           if (was_recursion)
 464             test_level |= G_LOG_FLAG_RECURSION;
 465
 466           /* check recursion and lookup handler */
 467           g_mutex_lock (g_messages_lock);
 468           domain = g_log_find_domain_L (log_domain ? log_domain : "");
 469           if (depth)
 470             test_level |= G_LOG_FLAG_RECURSION;
 471           depth++;
 472           domain_fatal_mask = domain ? domain->fatal_mask : G_LOG_FATAL_MASK;
 473           if ((domain_fatal_mask | g_log_always_fatal) & test_level)
 474             test_level |= G_LOG_FLAG_FATAL;
 475           if (test_level & G_LOG_FLAG_RECURSION)
 476             log_func = _g_log_fallback_handler;
 477           else
 478             log_func = g_log_domain_get_handler_L (domain, test_level, &data);
 479           domain = NULL;
 480           g_mutex_unlock (g_messages_lock);
 481
 482           g_private_set (g_log_depth, GUINT_TO_POINTER (depth));
 483
 484           /* had to defer debug initialization until we can keep track of recursion */
 485           if (!(test_level & G_LOG_FLAG_RECURSION) && !_g_debug_initialized)
 486             {
 487               GLogLevelFlags orig_test_level = test_level;
 488
 489               _g_debug_init ();
 490               if ((domain_fatal_mask | g_log_always_fatal) & test_level)
 491                 test_level |= G_LOG_FLAG_FATAL;
 492               if (test_level != orig_test_level)
 493                 {
 494                   /* need a relookup, not nice, but not too bad either */
 495                   g_mutex_lock (g_messages_lock);
 496                   domain = g_log_find_domain_L (log_domain ? log_domain : "");
 497                   log_func = g_log_domain_get_handler_L (domain, test_level, &data);
 498                   domain = NULL;
 499                   g_mutex_unlock (g_messages_lock);
 500                 }
 501             }
 502
 503           if (test_level & G_LOG_FLAG_RECURSION)
 504             {
 505               /* we use a stack buffer of fixed size, since we're likely
 506                * in an out-of-memory situation
 507                */
 508               gchar buffer[1025];
 509               gsize size;
 510               va_list args2;
 511
 512               G_VA_COPY (args2, args1);
 513               size = _g_vsnprintf (buffer, 1024, format, args2);
 514               va_end (args2);
 515
 516               log_func (log_domain, test_level, buffer, data);
 517             }
 518           else
 519             {
 520               gchar *msg;
 521               va_list args2;
 522
 523               G_VA_COPY (args2, args1);
 524               msg = g_strdup_vprintf (format, args2);
 525               va_end (args2);
 526
 527               log_func (log_domain, test_level, msg, data);
 528
 529               if ((test_level & G_LOG_FLAG_FATAL)
 530                 && !(test_level & G_LOG_LEVEL_ERROR))
 531                 {
 532                   masquerade_fatal = fatal_log_func
 533                     && !fatal_log_func (log_domain, test_level, msg, data);
 534                 }
 535
 536               g_free (msg);
 537             }
 538
 539           if ((test_level & G_LOG_FLAG_FATAL) && !masquerade_fatal)
 540             {
 541 #ifdef G_OS_WIN32
 542               gchar *locale_msg = g_locale_from_utf8 (fatal_msg_buf, -1, NULL, NULL, NULL);
 543
 544               MessageBox (NULL, locale_msg, NULL,
 545                           MB_ICONERROR|MB_SETFOREGROUND);
 546               if (IsDebuggerPresent () && !(test_level & G_LOG_FLAG_RECURSION))
 547                 G_BREAKPOINT ();
 548               else
 549                 abort ();
 550 #else
 551 #if defined (G_ENABLE_DEBUG) && defined (SIGTRAP)
 552               if (!(test_level & G_LOG_FLAG_RECURSION))
 553                 G_BREAKPOINT ();
 554               else
 555                 abort ();
 556 #else /* !G_ENABLE_DEBUG || !SIGTRAP */
 557               abort ();
 558 #endif /* !G_ENABLE_DEBUG || !SIGTRAP */
 559 #endif /* !G_OS_WIN32 */
 560             }
 561
 562           depth--;
 563           g_private_set (g_log_depth, GUINT_TO_POINTER (depth));
 564         }
 565     }
 566 }
 567
 568 void
 569 g_log (const gchar   *log_domain,
 570        GLogLevelFlags log_level,
 571        const gchar   *format,
 572        ...)
 573 {
 574   va_list args;
 575
 576   va_start (args, format);
 577   g_logv (log_domain, log_level, format, args);
 578   va_end (args);
 579 }
 580
 581 void
 582 g_return_if_fail_warning (const char *log_domain,
 583                           const char *pretty_function,
 584                           const char *expression)
 585 {
 586   g_log (log_domain,
 587          G_LOG_LEVEL_CRITICAL,
 588          "%s: assertion `%s' failed",
 589          pretty_function,
 590          expression);
 591 }
 592
 593 void
 594 g_warn_message (const char     *domain,
 595                 const char     *file,
 596                 int             line,
 597                 const char     *func,
 598                 const char     *warnexpr)
 599 {
 600   char *s, lstr[32];
 601   g_snprintf (lstr, 32, "%d", line);
 602   if (warnexpr)
 603     s = g_strconcat ("(", file, ":", lstr, "):",
 604                      func, func[0] ? ":" : "",
 605                      " runtime check failed: (", warnexpr, ")", NULL);
 606   else
 607     s = g_strconcat ("(", file, ":", lstr, "):",
 608                      func, func[0] ? ":" : "",
 609                      " ", "code should not be reached", NULL);
 610   g_log (domain, G_LOG_LEVEL_WARNING, "%s", s);
 611   g_free (s);
 612 }
 613
 614 void
 615 g_assert_warning (const char *log_domain,
 616                   const char *file,
 617                   const int   line,
 618                   const char *pretty_function,
 619                   const char *expression)
 620 {
 621   g_log (log_domain,
 622          G_LOG_LEVEL_ERROR,
 623          expression
 624          ? "file %s: line %d (%s): assertion failed: (%s)"
 625          : "file %s: line %d (%s): should not be reached",
 626          file,
 627          line,
 628          pretty_function,
 629          expression);
 630   abort ();
 631 }
 632
 633 #define CHAR_IS_SAFE(wc) (!((wc < 0x20 && wc != '\t' && wc != '\n' && wc != '\r') || \
 634                             (wc == 0x7f) || \
 635                             (wc >= 0x80 && wc < 0xa0)))
 636
 637 static gchar*
 638 strdup_convert (const gchar *string,
 639                 const gchar *charset)
 640 {
 641   if (!g_utf8_validate (string, -1, NULL))
 642     {
 643       GString *gstring = g_string_new ("[Invalid UTF-8] ");
 644       guchar *p;
 645
 646       for (p = (guchar *)string; *p; p++)
 647         {
 648           if (CHAR_IS_SAFE(*p) &&
 649               !(*p == '\r' && *(p + 1) != '\n') &&
 650               *p < 0x80)
 651             g_string_append_c (gstring, *p);
 652           else
 653             g_string_append_printf (gstring, "\\x%02x", (guint)(guchar)*p);
 654         }
 655
 656       return g_string_free (gstring, FALSE);
 657     }
 658   else
 659     {
 660       GError *err = NULL;
 661
 662       gchar *result = g_convert_with_fallback (string, -1, charset, "UTF-8", "?", NULL, NULL, &err);
 663       if (result)
 664         return result;
 665       else
 666         {
 667           /* Not thread-safe, but doesn't matter if we print the warning twice
 668            */
 669           static gboolean warned = FALSE;
 670           if (!warned)
 671             {
 672               warned = TRUE;
 673               _g_fprintf (stderr, "GLib: Cannot convert message: %s\n", err->message);
 674             }
 675           g_error_free (err);
 676
 677           return g_strdup (string);
 678         }
 679     }
 680 }
 681
 682 /* For a radix of 8 we need at most 3 output bytes for 1 input
 683  * byte. Additionally we might need up to 2 output bytes for the
 684  * readix prefix and 1 byte for the trailing NULL.
 685  */
 686 #define FORMAT_UNSIGNED_BUFSIZE ((GLIB_SIZEOF_LONG * 3) + 3)
 687
 688 static void
 689 format_unsigned (gchar  *buf,
 690                  gulong  num,
 691                  guint   radix)
 692 {
 693   gulong tmp;
 694   gchar c;
 695   gint i, n;
 696
 697   /* we may not call _any_ GLib functions here (or macros like g_return_if_fail()) */
 698
 699   if (radix != 8 && radix != 10 && radix != 16)
 700     {
 701       *buf = '\000';
 702       return;
 703     }
 704
 705   if (!num)
 706     {
 707       *buf++ = '0';
 708       *buf = '\000';
 709       return;
 710     }
 711
 712   if (radix == 16)
 713     {
 714       *buf++ = '0';
 715       *buf++ = 'x';
 716     }
 717   else if (radix == 8)
 718     {
 719       *buf++ = '0';
 720     }
 721
 722   n = 0;
 723   tmp = num;
 724   while (tmp)
 725     {
 726       tmp /= radix;
 727       n++;
 728     }
 729
 730   i = n;
 731
 732   /* Again we can't use g_assert; actually this check should _never_ fail. */
 733   if (n > FORMAT_UNSIGNED_BUFSIZE - 3)
 734     {
 735       *buf = '\000';
 736       return;
 737     }
 738
 739   while (num)
 740     {
 741       i--;
 742       c = (num % radix);
 743       if (c < 10)
 744         buf[i] = c + '0';
 745       else
 746         buf[i] = c + 'a' - 10;
 747       num /= radix;
 748     }
 749
 750   buf[n] = '\000';
 751 }
 752
 753 /* string size big enough to hold level prefix */
 754 #define STRING_BUFFER_SIZE      (FORMAT_UNSIGNED_BUFSIZE + 32)
 755
 756 #define ALERT_LEVELS            (G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_WARNING)
 757
 758 static int
 759 mklevel_prefix (gchar          level_prefix[STRING_BUFFER_SIZE],
 760                 GLogLevelFlags log_level)
 761 {
 762   gboolean to_stdout = TRUE;
 763
 764   /* we may not call _any_ GLib functions here */
 765
 766   switch (log_level & G_LOG_LEVEL_MASK)
 767     {
 768     case G_LOG_LEVEL_ERROR:
 769       strcpy (level_prefix, "ERROR");
 770       to_stdout = FALSE;
 771       break;
 772     case G_LOG_LEVEL_CRITICAL:
 773       strcpy (level_prefix, "CRITICAL");
 774       to_stdout = FALSE;
 775       break;
 776     case G_LOG_LEVEL_WARNING:
 777       strcpy (level_prefix, "WARNING");
 778       to_stdout = FALSE;
 779       break;
 780     case G_LOG_LEVEL_MESSAGE:
 781       strcpy (level_prefix, "Message");
 782       to_stdout = FALSE;
 783       break;
 784     case G_LOG_LEVEL_INFO:
 785       strcpy (level_prefix, "INFO");
 786       break;
 787     case G_LOG_LEVEL_DEBUG:
 788       strcpy (level_prefix, "DEBUG");
 789       break;
 790     default:
 791       if (log_level)
 792         {
 793           strcpy (level_prefix, "LOG-");
 794           format_unsigned (level_prefix + 4, log_level & G_LOG_LEVEL_MASK, 16);
 795         }
 796       else
 797         strcpy (level_prefix, "LOG");
 798       break;
 799     }
 800   if (log_level & G_LOG_FLAG_RECURSION)
 801     strcat (level_prefix, " (recursed)");
 802   if (log_level & ALERT_LEVELS)
 803     strcat (level_prefix, " **");
 804
 805 #ifdef G_OS_WIN32
 806   win32_keep_fatal_message = (log_level & G_LOG_FLAG_FATAL) != 0;
 807 #endif
 808   return to_stdout ? 1 : 2;
 809 }
 810
 811 void
 812 _g_log_fallback_handler (const gchar   *log_domain,
 813                          GLogLevelFlags log_level,
 814                          const gchar   *message,
 815                          gpointer       unused_data)
 816 {
 817   gchar level_prefix[STRING_BUFFER_SIZE];
 818 #ifndef G_OS_WIN32
 819   gchar pid_string[FORMAT_UNSIGNED_BUFSIZE];
 820 #endif
 821   gboolean is_fatal = (log_level & G_LOG_FLAG_FATAL) != 0;
 822   int fd;
 823
 824   /* we can not call _any_ GLib functions in this fallback handler,
 825    * which is why we skip UTF-8 conversion, etc.
 826    * since we either recursed or ran out of memory, we're in a pretty
 827    * pathologic situation anyways, what we can do is giving the
 828    * the process ID unconditionally however.
 829    */
 830
 831   fd = mklevel_prefix (level_prefix, log_level);
 832   if (!message)
 833     message = "(NULL) message";
 834
 835 #ifndef G_OS_WIN32
 836   format_unsigned (pid_string, getpid (), 10);
 837 #endif
 838
 839   if (log_domain)
 840     write_string (fd, "\n");
 841   else
 842     write_string (fd, "\n** ");
 843
 844 #ifndef G_OS_WIN32
 845   write_string (fd, "(process:");
 846   write_string (fd, pid_string);
 847   write_string (fd, "): ");
 848 #endif
 849
 850   if (log_domain)
 851     {
 852       write_string (fd, log_domain);
 853       write_string (fd, "-");
 854     }
 855   write_string (fd, level_prefix);
 856   write_string (fd, ": ");
 857   write_string (fd, message);
 858   if (is_fatal)
 859     write_string (fd, "\naborting...\n");
 860   else
 861     write_string (fd, "\n");
 862 }
 863
 864 static void
 865 escape_string (GString *string)
 866 {
 867   const char *p = string->str;
 868   gunichar wc;
 869
 870   while (p < string->str + string->len)
 871     {
 872       gboolean safe;
 873
 874       wc = g_utf8_get_char_validated (p, -1);
 875       if (wc == (gunichar)-1 || wc == (gunichar)-2)
 876         {
 877           gchar *tmp;
 878           guint pos;
 879
 880           pos = p - string->str;
 881
 882           /* Emit invalid UTF-8 as hex escapes
 883            */
 884           tmp = g_strdup_printf ("\\x%02x", (guint)(guchar)*p);
 885           g_string_erase (string, pos, 1);
 886           g_string_insert (string, pos, tmp);
 887
 888           p = string->str + (pos + 4); /* Skip over escape sequence */
 889
 890           g_free (tmp);
 891           continue;
 892         }
 893       if (wc == '\r')
 894         {
 895           safe = *(p + 1) == '\n';
 896         }
 897       else
 898         {
 899           safe = CHAR_IS_SAFE (wc);
 900         }
 901
 902       if (!safe)
 903         {
 904           gchar *tmp;
 905           guint pos;
 906
 907           pos = p - string->str;
 908
 909           /* Largest char we escape is 0x0a, so we don't have to worry
 910            * about 8-digit \Uxxxxyyyy
 911            */
 912           tmp = g_strdup_printf ("\\u%04x", wc);
 913           g_string_erase (string, pos, g_utf8_next_char (p) - p);
 914           g_string_insert (string, pos, tmp);
 915           g_free (tmp);
 916
 917           p = string->str + (pos + 6); /* Skip over escape sequence */
 918         }
 919       else
 920         p = g_utf8_next_char (p);
 921     }
 922 }
 923
 924 void
 925 g_log_default_handler (const gchar   *log_domain,
 926                        GLogLevelFlags log_level,
 927                        const gchar   *message,
 928                        gpointer       unused_data)
 929 {
 930   gboolean is_fatal = (log_level & G_LOG_FLAG_FATAL) != 0;
 931   gchar level_prefix[STRING_BUFFER_SIZE], *string;
 932   GString *gstring;
 933   int fd;
 934
 935   /* we can be called externally with recursion for whatever reason */
 936   if (log_level & G_LOG_FLAG_RECURSION)
 937     {
 938       _g_log_fallback_handler (log_domain, log_level, message, unused_data);
 939       return;
 940     }
 941
 942   g_messages_prefixed_init ();
 943
 944   fd = mklevel_prefix (level_prefix, log_level);
 945
 946   gstring = g_string_new (NULL);
 947   if (log_level & ALERT_LEVELS)
 948     g_string_append (gstring, "\n");
 949   if (!log_domain)
 950     g_string_append (gstring, "** ");
 951
 952   if ((g_log_msg_prefix & log_level) == log_level)
 953     {
 954       const gchar *prg_name = g_get_prgname ();
 955
 956       if (!prg_name)
 957         g_string_append_printf (gstring, "(process:%lu): ", (gulong)getpid ());
 958       else
 959         g_string_append_printf (gstring, "(%s:%lu): ", prg_name, (gulong)getpid ());
 960     }
 961
 962   if (log_domain)
 963     {
 964       g_string_append (gstring, log_domain);
 965       g_string_append_c (gstring, '-');
 966     }
 967   g_string_append (gstring, level_prefix);
 968
 969   g_string_append (gstring, ": ");
 970   if (!message)
 971     g_string_append (gstring, "(NULL) message");
 972   else
 973     {
 974       GString *msg;
 975       const gchar *charset;
 976
 977       msg = g_string_new (message);
 978       escape_string (msg);
 979
 980       if (g_get_charset (&charset))
 981         g_string_append (gstring, msg->str);    /* charset is UTF-8 already */
 982       else
 983         {
 984           string = strdup_convert (msg->str, charset);
 985           g_string_append (gstring, string);
 986           g_free (string);
 987         }
 988
 989       g_string_free (msg, TRUE);
 990     }
 991   if (is_fatal)
 992     g_string_append (gstring, "\naborting...\n");
 993   else
 994     g_string_append (gstring, "\n");
 995
 996   string = g_string_free (gstring, FALSE);
 997
 998   write_string (fd, string);
 999   g_free (string);
1000 }
1001
1002 GPrintFunc
1003 g_set_print_handler (GPrintFunc func)
1004 {
1005   GPrintFunc old_print_func;
1006
1007   g_mutex_lock (g_messages_lock);
1008   old_print_func = glib_print_func;
1009   glib_print_func = func;
1010   g_mutex_unlock (g_messages_lock);
1011
1012   return old_print_func;
1013 }
1014
1015 void
1016 g_print (const gchar *format,
1017          ...)
1018 {
1019   va_list args;
1020   gchar *string;
1021   GPrintFunc local_glib_print_func;
1022
1023   g_return_if_fail (format != NULL);
1024
1025   va_start (args, format);
1026   string = g_strdup_vprintf (format, args);
1027   va_end (args);
1028
1029   g_mutex_lock (g_messages_lock);
1030   local_glib_print_func = glib_print_func;
1031   g_mutex_unlock (g_messages_lock);
1032
1033   if (local_glib_print_func)
1034     local_glib_print_func (string);
1035   else
1036     {
1037       const gchar *charset;
1038
1039       if (g_get_charset (&charset))
1040         fputs (string, stdout); /* charset is UTF-8 already */
1041       else
1042         {
1043           gchar *lstring = strdup_convert (string, charset);
1044
1045           fputs (lstring, stdout);
1046           g_free (lstring);
1047         }
1048       fflush (stdout);
1049     }
1050   g_free (string);
1051 }
1052
1053 GPrintFunc
1054 g_set_printerr_handler (GPrintFunc func)
1055 {
1056   GPrintFunc old_printerr_func;
1057
1058   g_mutex_lock (g_messages_lock);
1059   old_printerr_func = glib_printerr_func;
1060   glib_printerr_func = func;
1061   g_mutex_unlock (g_messages_lock);
1062
1063   return old_printerr_func;
1064 }
1065
1066 void
1067 g_printerr (const gchar *format,
1068             ...)
1069 {
1070   va_list args;
1071   gchar *string;
1072   GPrintFunc local_glib_printerr_func;
1073
1074   g_return_if_fail (format != NULL);
1075
1076   va_start (args, format);
1077   string = g_strdup_vprintf (format, args);
1078   va_end (args);
1079
1080   g_mutex_lock (g_messages_lock);
1081   local_glib_printerr_func = glib_printerr_func;
1082   g_mutex_unlock (g_messages_lock);
1083
1084   if (local_glib_printerr_func)
1085     local_glib_printerr_func (string);
1086   else
1087     {
1088       const gchar *charset;
1089
1090       if (g_get_charset (&charset))
1091         fputs (string, stderr); /* charset is UTF-8 already */
1092       else
1093         {
1094           gchar *lstring = strdup_convert (string, charset);
1095
1096           fputs (lstring, stderr);
1097           g_free (lstring);
1098         }
1099       fflush (stderr);
1100     }
1101   g_free (string);
1102 }
1103
1104 gsize
1105 g_printf_string_upper_bound (const gchar *format,
1106                              va_list      args)
1107 {
1108   gchar c;
1109   return _g_vsnprintf (&c, 1, format, args) + 1;
1110 }
1111
1112 void
1113 _g_messages_thread_init_nomessage (void)
1114 {
1115   g_messages_lock = g_mutex_new ();
1116   g_log_depth = g_private_new (NULL);
1117   g_messages_prefixed_init ();
1118   _g_debug_init ();
1119 }
1120
1121 gboolean _g_debug_initialized = FALSE;
1122 guint _g_debug_flags = 0;
1123
1124 void
1125 _g_debug_init (void)
1126 {
1127   const gchar *val;
1128
1129   _g_debug_initialized = TRUE;
1130
1131   val = g_getenv ("G_DEBUG");
1132   if (val != NULL)
1133     {
1134       const GDebugKey keys[] = {
1135         {"fatal_warnings", G_DEBUG_FATAL_WARNINGS},
1136         {"fatal_criticals", G_DEBUG_FATAL_CRITICALS}
1137       };
1138
1139       _g_debug_flags = g_parse_debug_string (val, keys, G_N_ELEMENTS (keys));
1140     }
1141
1142   if (_g_debug_flags & G_DEBUG_FATAL_WARNINGS)
1143     {
1144       GLogLevelFlags fatal_mask;
1145
1146       fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
1147       fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
1148       g_log_set_always_fatal (fatal_mask);
1149     }
1150
1151   if (_g_debug_flags & G_DEBUG_FATAL_CRITICALS)
1152     {
1153       GLogLevelFlags fatal_mask;
1154
1155       fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
1156       fatal_mask |= G_LOG_LEVEL_CRITICAL;
1157       g_log_set_always_fatal (fatal_mask);
1158     }
1159 }