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 #ifdef HAVE_CONFIG_H
  32 #include <config.h>
  33 #endif
  34
  35 #include <stdlib.h>
  36 #include <stdarg.h>
  37 #include <stdio.h>
  38 #include <string.h>
  39 #include "glib.h"
  40 #ifdef HAVE_UNISTD_H
  41 #include <unistd.h>
  42 #endif
  43 #include <signal.h>
  44 #include <locale.h>
  45 #include <errno.h>
  46
  47 #ifdef G_OS_WIN32
  48 typedef FILE* GFileDescriptor;
  49 #else
  50 typedef gint GFileDescriptor;
  51 #endif
  52
  53 /* --- structures --- */
  54 typedef struct _GLogDomain      GLogDomain;
  55 typedef struct _GLogHandler     GLogHandler;
  56 struct _GLogDomain
  57 {
  58   gchar         *log_domain;
  59   GLogLevelFlags fatal_mask;
  60   GLogHandler   *handlers;
  61   GLogDomain    *next;
  62 };
  63 struct _GLogHandler
  64 {
  65   guint          id;
  66   GLogLevelFlags log_level;
  67   GLogFunc       log_func;
  68   gpointer       data;
  69   GLogHandler   *next;
  70 };
  71
  72
  73 /* --- prototypes --- */
  74 static inline guint printf_string_upper_bound (const gchar *format,
  75                                                gboolean     may_warn,
  76                                                va_list      args);
  77
  78
  79 /* --- variables --- */
  80
  81 static GMutex* g_messages_lock = NULL;
  82
  83 const gchar          *g_log_domain_glib = "GLib";
  84 static GLogDomain    *g_log_domains = NULL;
  85 static GLogLevelFlags g_log_always_fatal = G_LOG_FATAL_MASK;
  86 static GPrintFunc     glib_print_func = NULL;
  87 static GPrintFunc     glib_printerr_func = NULL;
  88 static GErrorFunc     glib_error_func = NULL;
  89 static GWarningFunc   glib_warning_func = NULL;
  90 static GPrintFunc     glib_message_func = NULL;
  91
  92 static GPrivate* g_log_depth = NULL;
  93
  94 /* --- functions --- */
  95 #ifdef G_OS_WIN32
  96 #  define STRICT
  97 #  include <windows.h>
  98 #  undef STRICT
  99 #  include <process.h>          /* For _getpid() */
 100
 101 static gboolean alloc_console_called = FALSE;
 102
 103 static gboolean gonna_abort = FALSE;
 104
 105 /* This default message will usually be overwritten. */
 106 /* Yes, a fixed size buffer is bad. So sue me. But g_error is never
 107  * with huge strings, is it? */
 108 static char fatal_msg_buf[1000] = "Unspecified fatal error encountered, aborting.";
 109 static char *fatal_msg_ptr = fatal_msg_buf;
 110
 111 /* Just use stdio. If we're out of memory, we're hosed anyway. */
 112 #undef write
 113 static inline int
 114 dowrite (GFileDescriptor fd,
 115          const void  *buf,
 116          unsigned int len)
 117 {
 118   if (gonna_abort)
 119     {
 120       memcpy (fatal_msg_ptr, buf, len);
 121       fatal_msg_ptr += len;
 122       *fatal_msg_ptr = 0;
 123       return len;
 124     }
 125
 126   fwrite (buf, len, 1, fd);
 127   fflush (fd);
 128
 129   return len;
 130 }
 131
 132 #define write(fd, buf, len) dowrite(fd, buf, len)
 133
 134 static void
 135 ensure_stdout_valid (void)
 136 {
 137   HANDLE handle;
 138
 139   if (gonna_abort)
 140     return;
 141
 142   if (!alloc_console_called)
 143     {
 144       handle = GetStdHandle (STD_OUTPUT_HANDLE);
 145
 146       if (handle == INVALID_HANDLE_VALUE)
 147         {
 148           AllocConsole ();
 149           alloc_console_called = TRUE;
 150           freopen ("CONOUT$", "w", stdout);
 151         }
 152     }
 153 }
 154 #else
 155 #define ensure_stdout_valid()   /* Define as empty */
 156 #endif
 157
 158 static void
 159 write_unsigned (GFileDescriptor   fd,
 160                 gulong num,
 161                 guint  radix)
 162 {
 163   char buffer[64];
 164   gulong tmp;
 165   char c;
 166   int i, n;
 167
 168   g_return_if_fail (radix >= 2 && radix <= 36);
 169
 170   if (!num)
 171     {
 172       write (fd, "0", 1);
 173       return;
 174     }
 175
 176   if (radix == 16)
 177     write (fd, "0x", 2);
 178   else if (radix == 8)
 179     write (fd, "0", 1);
 180
 181   n = 0;
 182   tmp = num;
 183   while (tmp)
 184     {
 185       tmp /= radix;
 186       n++;
 187     }
 188
 189   i = n;
 190   while (num)
 191     {
 192       i--;
 193       c = (num % radix);
 194       if (c < 10)
 195         buffer[i] = c + '0';
 196       else
 197         buffer[i] = c + 'a' - 10;
 198       num /= radix;
 199     }
 200
 201   write (fd, buffer, n);
 202 }
 203
 204 static void
 205 write_string (GFileDescriptor fd,
 206               gchar *string)
 207 {
 208   write (fd, string, strlen (string));
 209 }
 210
 211 static void
 212 g_log_write_prefix (GFileDescriptor fd,
 213                     GLogLevelFlags mask)
 214 {
 215   static GLogLevelFlags g_log_msg_prefix = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_DEBUG;
 216   static gboolean initialized = FALSE;
 217
 218   g_mutex_lock (g_messages_lock);
 219
 220   if (!initialized)
 221     {
 222       const gchar *val;
 223       initialized = TRUE;
 224
 225       val = g_getenv ("G_MESSAGES_PREFIXED");
 226
 227       if (val)
 228         {
 229           static const GDebugKey keys[] = {
 230             { "error", G_LOG_LEVEL_ERROR },
 231             { "critical", G_LOG_LEVEL_CRITICAL },
 232             { "warning", G_LOG_LEVEL_WARNING },
 233             { "message", G_LOG_LEVEL_MESSAGE },
 234             { "info", G_LOG_LEVEL_INFO },
 235             { "debug", G_LOG_LEVEL_DEBUG }
 236           };
 237
 238           g_log_msg_prefix = g_parse_debug_string (val, keys, G_N_ELEMENTS (keys));
 239         }
 240     }
 241
 242   g_mutex_unlock (g_messages_lock);
 243
 244   if ((g_log_msg_prefix & mask) == mask)
 245     {
 246       gchar *prg_name;
 247
 248       prg_name = g_get_prgname ();
 249
 250       if (!prg_name)
 251         write_string (fd, "(process:");
 252       else
 253         {
 254           write_string (fd, prg_name);
 255           write_string (fd, " (pid:");
 256         }
 257
 258       write_unsigned (fd, getpid (), 10);
 259       write_string (fd, "): ");
 260     }
 261 }
 262
 263 static inline GLogDomain*
 264 g_log_find_domain (const gchar *log_domain)
 265 {
 266   register GLogDomain *domain;
 267
 268   g_mutex_lock (g_messages_lock);
 269   domain = g_log_domains;
 270   while (domain)
 271     {
 272       if (strcmp (domain->log_domain, log_domain) == 0)
 273         {
 274           g_mutex_unlock (g_messages_lock);
 275           return domain;
 276         }
 277       domain = domain->next;
 278     }
 279   g_mutex_unlock (g_messages_lock);
 280   return NULL;
 281 }
 282
 283 static inline GLogDomain*
 284 g_log_domain_new (const gchar *log_domain)
 285 {
 286   register GLogDomain *domain;
 287
 288   domain = g_new (GLogDomain, 1);
 289   domain->log_domain = g_strdup (log_domain);
 290   domain->fatal_mask = G_LOG_FATAL_MASK;
 291   domain->handlers = NULL;
 292
 293   g_mutex_lock (g_messages_lock);
 294   domain->next = g_log_domains;
 295   g_log_domains = domain;
 296   g_mutex_unlock (g_messages_lock);
 297
 298   return domain;
 299 }
 300
 301 static inline void
 302 g_log_domain_check_free (GLogDomain *domain)
 303 {
 304   if (domain->fatal_mask == G_LOG_FATAL_MASK &&
 305       domain->handlers == NULL)
 306     {
 307       register GLogDomain *last, *work;
 308
 309       last = NULL;
 310
 311       g_mutex_lock (g_messages_lock);
 312       work = g_log_domains;
 313       while (work)
 314         {
 315           if (work == domain)
 316             {
 317               if (last)
 318                 last->next = domain->next;
 319               else
 320                 g_log_domains = domain->next;
 321               g_free (domain->log_domain);
 322               g_free (domain);
 323               break;
 324             }
 325           last = work;
 326           work = last->next;
 327         }
 328       g_mutex_unlock (g_messages_lock);
 329     }
 330 }
 331
 332 static inline GLogFunc
 333 g_log_domain_get_handler (GLogDomain    *domain,
 334                           GLogLevelFlags log_level,
 335                           gpointer      *data)
 336 {
 337   if (domain && log_level)
 338     {
 339       register GLogHandler *handler;
 340
 341       handler = domain->handlers;
 342       while (handler)
 343         {
 344           if ((handler->log_level & log_level) == log_level)
 345             {
 346               *data = handler->data;
 347               return handler->log_func;
 348             }
 349           handler = handler->next;
 350         }
 351     }
 352   return g_log_default_handler;
 353 }
 354
 355 GLogLevelFlags
 356 g_log_set_always_fatal (GLogLevelFlags fatal_mask)
 357 {
 358   GLogLevelFlags old_mask;
 359
 360   /* restrict the global mask to levels that are known to glib */
 361   fatal_mask &= (1 << G_LOG_LEVEL_USER_SHIFT) - 1;
 362   /* force errors to be fatal */
 363   fatal_mask |= G_LOG_LEVEL_ERROR;
 364   /* remove bogus flag */
 365   fatal_mask &= ~G_LOG_FLAG_FATAL;
 366
 367   g_mutex_lock (g_messages_lock);
 368   old_mask = g_log_always_fatal;
 369   g_log_always_fatal = fatal_mask;
 370   g_mutex_unlock (g_messages_lock);
 371
 372   return old_mask;
 373 }
 374
 375 GLogLevelFlags
 376 g_log_set_fatal_mask (const gchar    *log_domain,
 377                       GLogLevelFlags  fatal_mask)
 378 {
 379   GLogLevelFlags old_flags;
 380   register GLogDomain *domain;
 381
 382   if (!log_domain)
 383     log_domain = "";
 384
 385   /* force errors to be fatal */
 386   fatal_mask |= G_LOG_LEVEL_ERROR;
 387   /* remove bogus flag */
 388   fatal_mask &= ~G_LOG_FLAG_FATAL;
 389
 390   domain = g_log_find_domain (log_domain);
 391   if (!domain)
 392     domain = g_log_domain_new (log_domain);
 393   old_flags = domain->fatal_mask;
 394
 395   domain->fatal_mask = fatal_mask;
 396   g_log_domain_check_free (domain);
 397
 398   return old_flags;
 399 }
 400
 401 guint
 402 g_log_set_handler (const gchar    *log_domain,
 403                    GLogLevelFlags  log_levels,
 404                    GLogFunc        log_func,
 405                    gpointer        user_data)
 406 {
 407   register GLogDomain *domain;
 408   register GLogHandler *handler;
 409   static guint handler_id = 0;
 410
 411   g_return_val_if_fail ((log_levels & G_LOG_LEVEL_MASK) != 0, 0);
 412   g_return_val_if_fail (log_func != NULL, 0);
 413
 414   if (!log_domain)
 415     log_domain = "";
 416
 417   domain = g_log_find_domain (log_domain);
 418   if (!domain)
 419     domain = g_log_domain_new (log_domain);
 420
 421   handler = g_new (GLogHandler, 1);
 422   g_mutex_lock (g_messages_lock);
 423   handler->id = ++handler_id;
 424   g_mutex_unlock (g_messages_lock);
 425   handler->log_level = log_levels;
 426   handler->log_func = log_func;
 427   handler->data = user_data;
 428   handler->next = domain->handlers;
 429   domain->handlers = handler;
 430
 431   return handler_id;
 432 }
 433
 434 void
 435 g_log_remove_handler (const gchar *log_domain,
 436                       guint        handler_id)
 437 {
 438   register GLogDomain *domain;
 439
 440   g_return_if_fail (handler_id > 0);
 441
 442   if (!log_domain)
 443     log_domain = "";
 444
 445   domain = g_log_find_domain (log_domain);
 446   if (domain)
 447     {
 448       register GLogHandler *work, *last;
 449
 450       last = NULL;
 451       work = domain->handlers;
 452       while (work)
 453         {
 454           if (work->id == handler_id)
 455             {
 456               if (last)
 457                 last->next = work->next;
 458               else
 459                 domain->handlers = work->next;
 460               g_free (work);
 461               g_log_domain_check_free (domain);
 462               return;
 463             }
 464           last = work;
 465           work = last->next;
 466         }
 467     }
 468   g_warning ("g_log_remove_handler(): could not find handler with id `%d' for domain \"%s\"",
 469              handler_id,
 470              log_domain);
 471 }
 472
 473 void
 474 g_logv (const gchar   *log_domain,
 475         GLogLevelFlags log_level,
 476         const gchar   *format,
 477         va_list        args1)
 478 {
 479   va_list args2;
 480   gchar buffer[1025];
 481   register gint i;
 482
 483   log_level &= G_LOG_LEVEL_MASK;
 484   if (!log_level)
 485     return;
 486
 487   /* we use a stack buffer of fixed size, because we might get called
 488    * recursively.
 489    */
 490   G_VA_COPY (args2, args1);
 491   if (printf_string_upper_bound (format, FALSE, args1) < 1024)
 492     vsprintf (buffer, format, args2);
 493   else
 494     {
 495       /* since we might be out of memory, we can't use g_vsnprintf(). */
 496 #ifdef  HAVE_VSNPRINTF
 497       vsnprintf (buffer, 1024, format, args2);
 498 #else   /* !HAVE_VSNPRINTF */
 499       /* we are out of luck here */
 500       strncpy (buffer, format, 1024);
 501 #endif  /* !HAVE_VSNPRINTF */
 502       buffer[1024] = 0;
 503     }
 504   va_end (args2);
 505
 506   for (i = g_bit_nth_msf (log_level, -1); i >= 0; i = g_bit_nth_msf (log_level, i))
 507     {
 508       register GLogLevelFlags test_level;
 509
 510       test_level = 1 << i;
 511       if (log_level & test_level)
 512         {
 513           guint depth = GPOINTER_TO_UINT (g_private_get (g_log_depth));
 514           GLogDomain *domain;
 515           GLogFunc log_func;
 516           gpointer data = NULL;
 517
 518           domain = g_log_find_domain (log_domain ? log_domain : "");
 519
 520           if (depth)
 521             test_level |= G_LOG_FLAG_RECURSION;
 522
 523           depth++;
 524           g_private_set (g_log_depth, GUINT_TO_POINTER (depth));
 525
 526           g_mutex_lock (g_messages_lock);
 527           if ((((domain ? domain->fatal_mask : G_LOG_FATAL_MASK) |
 528                 g_log_always_fatal) & test_level) != 0)
 529             test_level |= G_LOG_FLAG_FATAL;
 530           g_mutex_unlock (g_messages_lock);
 531
 532           log_func = g_log_domain_get_handler (domain, test_level, &data);
 533           log_func (log_domain, test_level, buffer, data);
 534
 535           /* *domain can be cluttered now */
 536
 537           if (test_level & G_LOG_FLAG_FATAL)
 538             {
 539 #if defined (G_ENABLE_DEBUG) && defined (SIGTRAP)
 540               if (!(test_level & G_LOG_FLAG_RECURSION))
 541                 raise (SIGTRAP);
 542               else
 543                 abort ();
 544 #else /* !G_ENABLE_DEBUG || !SIGTRAP */
 545 #ifdef G_OS_WIN32
 546               MessageBox (NULL, fatal_msg_buf, NULL, MB_OK);
 547 #endif
 548 # if defined (_MSC_VER) && defined (_DEBUG)
 549               /* let's see the call stack ... */
 550               __asm int 3
 551 # endif
 552               abort ();
 553 #endif /* !G_ENABLE_DEBUG || !SIGTRAP */
 554             }
 555
 556           depth--;
 557           g_private_set (g_log_depth, GUINT_TO_POINTER (depth));
 558         }
 559     }
 560 }
 561
 562 void
 563 g_log (const gchar    *log_domain,
 564        GLogLevelFlags  log_level,
 565        const gchar    *format,
 566        ...)
 567 {
 568   va_list args;
 569
 570   va_start (args, format);
 571   g_logv (log_domain, log_level, format, args);
 572   va_end (args);
 573 }
 574
 575 void
 576 g_log_default_handler (const gchar    *log_domain,
 577                        GLogLevelFlags  log_level,
 578                        const gchar    *message,
 579                        gpointer        unused_data)
 580 {
 581   GFileDescriptor fd;
 582   gboolean in_recursion;
 583   gboolean is_fatal;
 584   GErrorFunc local_glib_error_func;
 585   GWarningFunc local_glib_warning_func;
 586   GPrintFunc local_glib_message_func;
 587
 588   in_recursion = (log_level & G_LOG_FLAG_RECURSION) != 0;
 589   is_fatal = (log_level & G_LOG_FLAG_FATAL) != 0;
 590   log_level &= G_LOG_LEVEL_MASK;
 591
 592   if (!message)
 593     message = "g_log_default_handler(): (NULL) message";
 594
 595 #ifdef G_OS_WIN32
 596   /* Use just stdout as stderr is hard to get redirected from the
 597    * DOS prompt.
 598    */
 599   fd = stdout;
 600   gonna_abort = is_fatal;
 601 #else
 602   fd = (log_level > G_LOG_LEVEL_MESSAGE) ? 1 : 2;
 603 #endif
 604
 605   g_mutex_lock (g_messages_lock);
 606   local_glib_error_func = glib_error_func;
 607   local_glib_warning_func = glib_warning_func;
 608   local_glib_message_func = glib_message_func;
 609   g_mutex_unlock (g_messages_lock);
 610
 611   switch (log_level)
 612     {
 613     case G_LOG_LEVEL_ERROR:
 614       if (!log_domain && local_glib_error_func)
 615         {
 616           /* compatibility code */
 617           local_glib_error_func (message);
 618           return;
 619         }
 620       /* use write(2) for output, in case we are out of memeory */
 621       ensure_stdout_valid ();
 622       write (fd, "\n", 1);
 623       g_log_write_prefix (fd, log_level);
 624
 625       if (log_domain)
 626         {
 627           write (fd, log_domain, strlen (log_domain));
 628           write (fd, "-", 1);
 629         }
 630       else
 631         write (fd, "** ", 3);
 632       if (in_recursion)
 633         write (fd, "ERROR (recursed) **: ", 21);
 634       else
 635         write (fd, "ERROR **: ", 10);
 636       write (fd, message, strlen (message));
 637       if (is_fatal)
 638         write (fd, "\naborting...\n", 13);
 639       else
 640         write (fd, "\n", 1);
 641       break;
 642     case G_LOG_LEVEL_CRITICAL:
 643       ensure_stdout_valid ();
 644       write (fd, "\n", 1);
 645       g_log_write_prefix (fd, log_level);
 646
 647       if (log_domain)
 648         {
 649           write (fd, log_domain, strlen (log_domain));
 650           write (fd, "-", 1);
 651         }
 652       else
 653         write (fd, "** ", 3);
 654       if (in_recursion)
 655         write (fd, "CRITICAL (recursed) **: ", 24);
 656       else
 657         write (fd, "CRITICAL **: ", 13);
 658       write (fd, message, strlen (message));
 659       if (is_fatal)
 660         write (fd, "\naborting...\n", 13);
 661       else
 662         write (fd, "\n", 1);
 663       break;
 664     case G_LOG_LEVEL_WARNING:
 665       if (!log_domain && local_glib_warning_func)
 666         {
 667           /* compatibility code */
 668           local_glib_warning_func (message);
 669           return;
 670         }
 671       ensure_stdout_valid ();
 672       write (fd, "\n", 1);
 673       g_log_write_prefix (fd, log_level);
 674
 675       if (log_domain)
 676         {
 677           write (fd, log_domain, strlen (log_domain));
 678           write (fd, "-", 1);
 679         }
 680       else
 681         write (fd, "** ", 3);
 682       if (in_recursion)
 683         write (fd, "WARNING (recursed) **: ", 23);
 684       else
 685         write (fd, "WARNING **: ", 12);
 686       write (fd, message, strlen (message));
 687       if (is_fatal)
 688         write (fd, "\naborting...\n", 13);
 689       else
 690         write (fd, "\n", 1);
 691       break;
 692     case G_LOG_LEVEL_MESSAGE:
 693       if (!log_domain && local_glib_message_func)
 694         {
 695           /* compatibility code */
 696           local_glib_message_func (message);
 697           return;
 698         }
 699       ensure_stdout_valid ();
 700
 701       g_log_write_prefix (fd, log_level);
 702
 703       if (log_domain)
 704         {
 705           write (fd, log_domain, strlen (log_domain));
 706           write (fd, "-", 1);
 707         }
 708       if (in_recursion)
 709         write (fd, "Message (recursed): ", 20);
 710       else
 711         write (fd, "Message: ", 9);
 712       write (fd, message, strlen (message));
 713       if (is_fatal)
 714         write (fd, "\naborting...\n", 13);
 715       else
 716         write (fd, "\n", 1);
 717       break;
 718     case G_LOG_LEVEL_INFO:
 719       ensure_stdout_valid ();
 720
 721       g_log_write_prefix (fd, log_level);
 722
 723       if (log_domain)
 724         {
 725           write (fd, log_domain, strlen (log_domain));
 726           write (fd, "-", 1);
 727         }
 728       if (in_recursion)
 729         write (fd, "INFO (recursed): ", 17);
 730       else
 731         write (fd, "INFO: ", 6);
 732       write (fd, message, strlen (message));
 733       if (is_fatal)
 734         write (fd, "\naborting...\n", 13);
 735       else
 736         write (fd, "\n", 1);
 737       break;
 738     case G_LOG_LEVEL_DEBUG:
 739       ensure_stdout_valid ();
 740
 741       g_log_write_prefix (fd, log_level);
 742
 743       if (log_domain)
 744         {
 745           write (fd, log_domain, strlen (log_domain));
 746           write (fd, "-", 1);
 747         }
 748       if (in_recursion)
 749         write (fd, "DEBUG (recursed): ", 18);
 750       else
 751         write (fd, "DEBUG: ", 7);
 752       write (fd, message, strlen (message));
 753       if (is_fatal)
 754         write (fd, "\naborting...\n", 13);
 755       else
 756         write (fd, "\n", 1);
 757       break;
 758     default:
 759       /* we are used for a log level that is not defined by GLib itself,
 760        * try to make the best out of it.
 761        */
 762       ensure_stdout_valid ();
 763
 764       g_log_write_prefix (fd, log_level);
 765
 766       if (log_domain)
 767         {
 768           write (fd, log_domain, strlen (log_domain));
 769           if (in_recursion)
 770             write (fd, "-LOG (recursed:", 15);
 771           else
 772             write (fd, "-LOG (", 6);
 773         }
 774       else if (in_recursion)
 775         write (fd, "LOG (recursed:", 14);
 776       else
 777         write (fd, "LOG (", 5);
 778       if (log_level)
 779         {
 780           gchar string[] = "0x00): ";
 781           gchar *p = string + 2;
 782           guint i;
 783
 784           i = g_bit_nth_msf (log_level, -1);
 785           *p = i >> 4;
 786           p++;
 787           *p = '0' + (i & 0xf);
 788           if (*p > '9')
 789             *p += 'A' - '9' - 1;
 790
 791           write (fd, string, 7);
 792         }
 793       else
 794         write (fd, "): ", 3);
 795       write (fd, message, strlen (message));
 796       if (is_fatal)
 797         write (fd, "\naborting...\n", 13);
 798       else
 799         write (fd, "\n", 1);
 800       break;
 801     }
 802 }
 803
 804 GPrintFunc
 805 g_set_print_handler (GPrintFunc func)
 806 {
 807   GPrintFunc old_print_func;
 808
 809   g_mutex_lock (g_messages_lock);
 810   old_print_func = glib_print_func;
 811   glib_print_func = func;
 812   g_mutex_unlock (g_messages_lock);
 813
 814   return old_print_func;
 815 }
 816
 817 void
 818 g_print (const gchar *format,
 819          ...)
 820 {
 821   va_list args;
 822   gchar *string;
 823   GPrintFunc local_glib_print_func;
 824
 825   g_return_if_fail (format != NULL);
 826
 827   va_start (args, format);
 828   string = g_strdup_vprintf (format, args);
 829   va_end (args);
 830
 831   g_mutex_lock (g_messages_lock);
 832   local_glib_print_func = glib_print_func;
 833   g_mutex_unlock (g_messages_lock);
 834
 835   if (local_glib_print_func)
 836     local_glib_print_func (string);
 837   else
 838     {
 839       ensure_stdout_valid ();
 840       fputs (string, stdout);
 841       fflush (stdout);
 842     }
 843   g_free (string);
 844 }
 845
 846 GPrintFunc
 847 g_set_printerr_handler (GPrintFunc func)
 848 {
 849   GPrintFunc old_printerr_func;
 850
 851   g_mutex_lock (g_messages_lock);
 852   old_printerr_func = glib_printerr_func;
 853   glib_printerr_func = func;
 854   g_mutex_unlock (g_messages_lock);
 855
 856   return old_printerr_func;
 857 }
 858
 859 void
 860 g_printerr (const gchar *format,
 861             ...)
 862 {
 863   va_list args;
 864   gchar *string;
 865   GPrintFunc local_glib_printerr_func;
 866
 867   g_return_if_fail (format != NULL);
 868
 869   va_start (args, format);
 870   string = g_strdup_vprintf (format, args);
 871   va_end (args);
 872
 873   g_mutex_lock (g_messages_lock);
 874   local_glib_printerr_func = glib_printerr_func;
 875   g_mutex_unlock (g_messages_lock);
 876
 877   if (local_glib_printerr_func)
 878     local_glib_printerr_func (string);
 879   else
 880     {
 881       fputs (string, stderr);
 882       fflush (stderr);
 883     }
 884   g_free (string);
 885 }
 886
 887 /* compatibility code */
 888 GErrorFunc
 889 g_set_error_handler (GErrorFunc func)
 890 {
 891   GErrorFunc old_error_func;
 892
 893   g_mutex_lock (g_messages_lock);
 894   old_error_func = glib_error_func;
 895   glib_error_func = func;
 896   g_mutex_unlock (g_messages_lock);
 897
 898   return old_error_func;
 899 }
 900
 901 /* compatibility code */
 902 GWarningFunc
 903 g_set_warning_handler (GWarningFunc func)
 904 {
 905   GWarningFunc old_warning_func;
 906
 907   g_mutex_lock (g_messages_lock);
 908   old_warning_func = glib_warning_func;
 909   glib_warning_func = func;
 910   g_mutex_unlock (g_messages_lock);
 911
 912   return old_warning_func;
 913 }
 914
 915 /* compatibility code */
 916 GPrintFunc
 917 g_set_message_handler (GPrintFunc func)
 918 {
 919   GPrintFunc old_message_func;
 920
 921   g_mutex_lock (g_messages_lock);
 922   old_message_func = glib_message_func;
 923   glib_message_func = func;
 924   g_mutex_unlock (g_messages_lock);
 925
 926   return old_message_func;
 927 }
 928
 929 #ifndef MB_LEN_MAX
 930 #  define MB_LEN_MAX 8
 931 #endif
 932
 933 typedef struct
 934 {
 935   guint min_width;
 936   guint precision;
 937   gboolean alternate_format, zero_padding, adjust_left, locale_grouping;
 938   gboolean add_space, add_sign, possible_sign, seen_precision;
 939   gboolean mod_half, mod_long, mod_extra_long;
 940 } PrintfArgSpec;
 941
 942 static inline guint
 943 printf_string_upper_bound (const gchar *format,
 944                            gboolean     may_warn,
 945                            va_list      args)
 946 {
 947   static const gboolean honour_longs = SIZEOF_LONG > 4 || SIZEOF_VOID_P > 4;
 948   guint len = 1;
 949
 950   if (!format)
 951     return len;
 952
 953   while (*format)
 954     {
 955       register gchar c = *format++;
 956
 957       if (c != '%')
 958         len += 1;
 959       else /* (c == '%') */
 960         {
 961           PrintfArgSpec spec = { 0, };
 962           gboolean seen_l = FALSE, conv_done = FALSE;
 963           guint conv_len = 0;
 964           const gchar *spec_start = format;
 965
 966           do
 967             {
 968               c = *format++;
 969               switch (c)
 970                 {
 971                   GDoubleIEEE754 u_double;
 972                   guint v_uint;
 973                   gint v_int;
 974                   const gchar *v_string;
 975
 976                   /* beware of positional parameters
 977                    */
 978                 case '$':
 979                   if (may_warn)
 980                     g_warning (G_GNUC_PRETTY_FUNCTION
 981                                "(): unable to handle positional parameters (%%n$)");
 982                   len += 1024; /* try adding some safety padding */
 983                   break;
 984
 985                   /* parse flags
 986                    */
 987                 case '#':
 988                   spec.alternate_format = TRUE;
 989                   break;
 990                 case '0':
 991                   spec.zero_padding = TRUE;
 992                   break;
 993                 case '-':
 994                   spec.adjust_left = TRUE;
 995                   break;
 996                 case ' ':
 997                   spec.add_space = TRUE;
 998                   break;
 999                 case '+':
1000                   spec.add_sign = TRUE;
1001                   break;
1002                 case '\'':
1003                   spec.locale_grouping = TRUE;
1004                   break;
1005
1006                   /* parse output size specifications
1007                    */
1008                 case '.':
1009                   spec.seen_precision = TRUE;
1010                   break;
1011                 case '1':
1012                 case '2':
1013                 case '3':
1014                 case '4':
1015                 case '5':
1016                 case '6':
1017                 case '7':
1018                 case '8':
1019                 case '9':
1020                   v_uint = c - '0';
1021                   c = *format;
1022                   while (c >= '0' && c <= '9')
1023                     {
1024                       format++;
1025                       v_uint = v_uint * 10 + c - '0';
1026                       c = *format;
1027                     }
1028                   if (spec.seen_precision)
1029                     spec.precision = MAX (spec.precision, v_uint);
1030                   else
1031                     spec.min_width = MAX (spec.min_width, v_uint);
1032                   break;
1033                 case '*':
1034                   v_int = va_arg (args, int);
1035                   if (spec.seen_precision)
1036                     {
1037                       /* forget about negative precision */
1038                       if (v_int >= 0)
1039                         spec.precision = MAX (spec.precision, v_int);
1040                     }
1041                   else
1042                     {
1043                       if (v_int < 0)
1044                         {
1045                           v_int = - v_int;
1046                           spec.adjust_left = TRUE;
1047                         }
1048                       spec.min_width = MAX (spec.min_width, v_int);
1049                     }
1050                   break;
1051
1052                   /* parse type modifiers
1053                    */
1054                 case 'h':
1055                   spec.mod_half = TRUE;
1056                   break;
1057                 case 'l':
1058                   if (!seen_l)
1059                     {
1060                       spec.mod_long = TRUE;
1061                       seen_l = TRUE;
1062                       break;
1063                     }
1064                   /* else, fall through */
1065                 case 'L':
1066                 case 'q':
1067                   spec.mod_long = TRUE;
1068                   spec.mod_extra_long = TRUE;
1069                   break;
1070                 case 'z':
1071                 case 'Z':
1072 #if GLIB_SIZEOF_SIZE_T > 4
1073                   spec.mod_long = TRUE;
1074                   spec.mod_extra_long = TRUE;
1075 #endif /* GLIB_SIZEOF_SIZE_T > 4 */
1076                   break;
1077                 case 't':
1078 #if GLIB_SIZEOF_PTRDIFF_T > 4
1079                   spec.mod_long = TRUE;
1080                   spec.mod_extra_long = TRUE;
1081 #endif /* GLIB_SIZEOF_PTRDIFF_T > 4 */
1082                   break;
1083                 case 'j':
1084 #if GLIB_SIZEOF_INTMAX_T > 4
1085                   spec.mod_long = TRUE;
1086                   spec.mod_extra_long = TRUE;
1087 #endif /* GLIB_SIZEOF_INTMAX_T > 4 */
1088                   break;
1089
1090                   /* parse output conversions
1091                    */
1092                 case '%':
1093                   conv_len += 1;
1094                   break;
1095                 case 'O':
1096                 case 'D':
1097                 case 'I':
1098                 case 'U':
1099                   /* some C libraries feature long variants for these as well? */
1100                   spec.mod_long = TRUE;
1101                   /* fall through */
1102                 case 'o':
1103                   conv_len += 2;
1104                   /* fall through */
1105                 case 'd':
1106                 case 'i':
1107                   conv_len += 1; /* sign */
1108                   /* fall through */
1109                 case 'u':
1110                   conv_len += 4;
1111                   /* fall through */
1112                 case 'x':
1113                 case 'X':
1114                   spec.possible_sign = TRUE;
1115                   conv_len += 10;
1116                   if (spec.mod_long && honour_longs)
1117                     conv_len *= 2;
1118                   if (spec.mod_extra_long)
1119                     conv_len *= 2;
1120                   if (spec.mod_extra_long)
1121                     {
1122 #ifdef G_HAVE_GINT64
1123                       (void) va_arg (args, gint64);
1124 #else /* !G_HAVE_GINT64 */
1125                       (void) va_arg (args, long);
1126 #endif /* !G_HAVE_GINT64 */
1127                     }
1128                   else if (spec.mod_long)
1129                     (void) va_arg (args, long);
1130                   else
1131                     (void) va_arg (args, int);
1132                   break;
1133                 case 'A':
1134                 case 'a':
1135                   /*          0x */
1136                   conv_len += 2;
1137                   /* fall through */
1138                 case 'g':
1139                 case 'G':
1140                 case 'e':
1141                 case 'E':
1142                 case 'f':
1143                   spec.possible_sign = TRUE;
1144                   /*          n   .   dddddddddddddddddddddddd   E   +-  eeee */
1145                   conv_len += 1 + 1 + MAX (24, spec.precision) + 1 + 1 + 4;
1146                   if (may_warn && spec.mod_extra_long)
1147                     g_warning (G_GNUC_PRETTY_FUNCTION
1148                                "(): unable to handle long double, collecting double only");
1149 #ifdef HAVE_LONG_DOUBLE
1150 #error need to implement special handling for long double
1151 #endif
1152                   u_double.v_double = va_arg (args, double);
1153                   /* %f can expand up to all significant digits before '.' (308) */
1154                   if (c == 'f' &&
1155                       u_double.mpn.biased_exponent > 0 && u_double.mpn.biased_exponent < 2047)
1156                     {
1157                       gint exp = u_double.mpn.biased_exponent;
1158
1159                       exp -= G_IEEE754_DOUBLE_BIAS;
1160                       exp = exp * G_LOG_2_BASE_10 + 1;
1161                       conv_len += exp;
1162                     }
1163                   /* some printf() implementations require extra padding for rounding */
1164                   conv_len += 2;
1165                   /* we can't really handle locale specific grouping here */
1166                   if (spec.locale_grouping)
1167                     conv_len *= 2;
1168                   break;
1169                 case 'C':
1170                   spec.mod_long = TRUE;
1171                   /* fall through */
1172                 case 'c':
1173                   conv_len += spec.mod_long ? MB_LEN_MAX : 1;
1174                   (void) va_arg (args, int);
1175                   break;
1176                 case 'S':
1177                   spec.mod_long = TRUE;
1178                   /* fall through */
1179                 case 's':
1180                   v_string = va_arg (args, char*);
1181                   if (!v_string)
1182                     conv_len += 8; /* hold "(null)" */
1183                   else if (spec.seen_precision)
1184                     conv_len += spec.precision;
1185                   else
1186                     conv_len += strlen (v_string);
1187                   conv_done = TRUE;
1188                   if (spec.mod_long)
1189                     {
1190                       if (may_warn)
1191                         g_warning (G_GNUC_PRETTY_FUNCTION
1192                                    "(): unable to handle wide char strings");
1193                       len += 1024; /* try adding some safety padding */
1194                     }
1195                   break;
1196                 case 'P': /* do we actually need this? */
1197                   /* fall through */
1198                 case 'p':
1199                   spec.alternate_format = TRUE;
1200                   conv_len += 10;
1201                   if (honour_longs)
1202                     conv_len *= 2;
1203                   /* fall through */
1204                 case 'n':
1205                   conv_done = TRUE;
1206                   (void) va_arg (args, void*);
1207                   break;
1208                 case 'm':
1209                   /* there's not much we can do to be clever */
1210                   v_string = g_strerror (errno);
1211                   v_uint = v_string ? strlen (v_string) : 0;
1212                   conv_len += MAX (256, v_uint);
1213                   break;
1214
1215                   /* handle invalid cases
1216                    */
1217                 case '\000':
1218                   /* no conversion specification, bad bad */
1219                   conv_len += format - spec_start;
1220                   break;
1221                 default:
1222                   if (may_warn)
1223                     g_warning (G_GNUC_PRETTY_FUNCTION
1224                                "(): unable to handle `%c' while parsing format",
1225                                c);
1226                   break;
1227                 }
1228               conv_done |= conv_len > 0;
1229             }
1230           while (!conv_done);
1231           /* handle width specifications */
1232           conv_len = MAX (conv_len, MAX (spec.precision, spec.min_width));
1233           /* handle flags */
1234           conv_len += spec.alternate_format ? 2 : 0;
1235           conv_len += (spec.add_space || spec.add_sign || spec.possible_sign);
1236           /* finally done */
1237           len += conv_len;
1238         } /* else (c == '%') */
1239     } /* while (*format) */
1240
1241   return len;
1242 }
1243
1244 guint
1245 g_printf_string_upper_bound (const gchar *format,
1246                              va_list      args)
1247 {
1248   return printf_string_upper_bound (format, TRUE, args);
1249 }
1250
1251 void
1252 g_messages_init (void)
1253 {
1254   g_messages_lock = g_mutex_new();
1255   g_log_depth = g_private_new(NULL);
1256 }