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