glib/gmessages.h

   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 #ifndef __G_MESSAGES_H__
  28 #define __G_MESSAGES_H__
  29
  30 #include <stdarg.h>
  31 #include <glib/gtypes.h>
  32
  33 G_BEGIN_DECLS
  34
  35 /* calculate a string size, guarranteed to fit format + args.
  36  */
  37 gsize   g_printf_string_upper_bound (const gchar* format,
  38                                      va_list      args);
  39
  40 /* Log level shift offset for user defined
  41  * log levels (0-7 are used by GLib).
  42  */
  43 #define G_LOG_LEVEL_USER_SHIFT  (8)
  44
  45 /* Glib log levels and flags.
  46  */
  47 typedef enum
  48 {
  49   /* log flags */
  50   G_LOG_FLAG_RECURSION          = 1 << 0,
  51   G_LOG_FLAG_FATAL              = 1 << 1,
  52
  53   /* GLib log levels */
  54   G_LOG_LEVEL_ERROR             = 1 << 2,       /* always fatal */
  55   G_LOG_LEVEL_CRITICAL          = 1 << 3,
  56   G_LOG_LEVEL_WARNING           = 1 << 4,
  57   G_LOG_LEVEL_MESSAGE           = 1 << 5,
  58   G_LOG_LEVEL_INFO              = 1 << 6,
  59   G_LOG_LEVEL_DEBUG             = 1 << 7,
  60
  61   G_LOG_LEVEL_MASK              = ~(G_LOG_FLAG_RECURSION | G_LOG_FLAG_FATAL)
  62 } GLogLevelFlags;
  63
  64 /* GLib log levels that are considered fatal by default */
  65 #define G_LOG_FATAL_MASK        (G_LOG_FLAG_RECURSION | G_LOG_LEVEL_ERROR)
  66
  67 typedef void            (*GLogFunc)             (const gchar   *log_domain,
  68                                                  GLogLevelFlags log_level,
  69                                                  const gchar   *message,
  70                                                  gpointer       user_data);
  71
  72 /* Logging mechanism
  73  */
  74 GLIB_VAR        const gchar             *g_log_domain_glib;
  75 guint           g_log_set_handler       (const gchar    *log_domain,
  76                                          GLogLevelFlags  log_levels,
  77                                          GLogFunc        log_func,
  78                                          gpointer        user_data);
  79 void            g_log_remove_handler    (const gchar    *log_domain,
  80                                          guint           handler_id);
  81 void            g_log_default_handler   (const gchar    *log_domain,
  82                                          GLogLevelFlags  log_level,
  83                                          const gchar    *message,
  84                                          gpointer        unused_data);
  85 void            g_log                   (const gchar    *log_domain,
  86                                          GLogLevelFlags  log_level,
  87                                          const gchar    *format,
  88                                          ...) G_GNUC_PRINTF (3, 4);
  89 void            g_logv                  (const gchar    *log_domain,
  90                                          GLogLevelFlags  log_level,
  91                                          const gchar    *format,
  92                                          va_list         args);
  93 GLogLevelFlags  g_log_set_fatal_mask    (const gchar    *log_domain,
  94                                          GLogLevelFlags  fatal_mask);
  95 GLogLevelFlags  g_log_set_always_fatal  (GLogLevelFlags  fatal_mask);
  96
  97 #ifndef G_LOG_DOMAIN
  98 #define G_LOG_DOMAIN    ((gchar*) 0)
  99 #endif  /* G_LOG_DOMAIN */
 100 #ifdef G_HAVE_ISO_VARARGS
 101 #define g_error(...)    g_log (G_LOG_DOMAIN,         \
 102                                G_LOG_LEVEL_ERROR,    \
 103                                __VA_ARGS__)
 104 #define g_message(...)  g_log (G_LOG_DOMAIN,         \
 105                                G_LOG_LEVEL_MESSAGE,  \
 106                                __VA_ARGS__)
 107 #define g_critical(...) g_log (G_LOG_DOMAIN,         \
 108                                G_LOG_LEVEL_CRITICAL, \
 109                                __VA_ARGS__)
 110 #define g_warning(...)  g_log (G_LOG_DOMAIN,         \
 111                                G_LOG_LEVEL_WARNING,  \
 112                                __VA_ARGS__)
 113 #elif defined(G_HAVE_GNUC_VARARGS)
 114 #define g_error(format...)      g_log (G_LOG_DOMAIN,         \
 115                                        G_LOG_LEVEL_ERROR,    \
 116                                        format)
 117 #define g_message(format...)    g_log (G_LOG_DOMAIN,         \
 118                                        G_LOG_LEVEL_MESSAGE,  \
 119                                        format)
 120 #define g_critical(format...)   g_log (G_LOG_DOMAIN,         \
 121                                        G_LOG_LEVEL_CRITICAL, \
 122                                        format)
 123 #define g_warning(format...)    g_log (G_LOG_DOMAIN,         \
 124                                        G_LOG_LEVEL_WARNING,  \
 125                                        format)
 126 #else   /* no varargs macros */
 127 static void
 128 g_error (const gchar *format,
 129          ...)
 130 {
 131   va_list args;
 132   va_start (args, format);
 133   g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_ERROR, format, args);
 134   va_end (args);
 135 }
 136 static void
 137 g_message (const gchar *format,
 138            ...)
 139 {
 140   va_list args;
 141   va_start (args, format);
 142   g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_MESSAGE, format, args);
 143   va_end (args);
 144 }
 145 static void
 146 g_critical (const gchar *format,
 147             ...)
 148 {
 149   va_list args;
 150   va_start (args, format);
 151   g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL, format, args);
 152   va_end (args);
 153 }
 154 static void
 155 g_warning (const gchar *format,
 156            ...)
 157 {
 158   va_list args;
 159   va_start (args, format);
 160   g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_WARNING, format, args);
 161   va_end (args);
 162 }
 163 #endif  /* !__GNUC__ */
 164
 165 typedef void    (*GPrintFunc)           (const gchar    *string);
 166 void            g_print                 (const gchar    *format,
 167                                          ...) G_GNUC_PRINTF (1, 2);
 168 GPrintFunc      g_set_print_handler     (GPrintFunc      func);
 169 void            g_printerr              (const gchar    *format,
 170                                          ...) G_GNUC_PRINTF (1, 2);
 171 GPrintFunc      g_set_printerr_handler  (GPrintFunc      func);
 172
 173
 174 /* Provide macros for error handling. The "assert" macros will
 175  *  exit on failure. The "return" macros will exit the current
 176  *  function. Two different definitions are given for the macros
 177  *  if G_DISABLE_ASSERT is not defined, in order to support gcc's
 178  *  __PRETTY_FUNCTION__ capability.
 179  */
 180
 181 #ifdef G_DISABLE_ASSERT
 182
 183 #define g_assert(expr)          G_STMT_START{ }G_STMT_END
 184 #define g_assert_not_reached()  G_STMT_START{ }G_STMT_END
 185
 186 #else /* !G_DISABLE_ASSERT */
 187
 188 #ifdef __GNUC__
 189
 190 #define g_assert(expr)                  G_STMT_START{           \
 191      if (!(expr))                                               \
 192        g_log (G_LOG_DOMAIN,                                     \
 193               G_LOG_LEVEL_ERROR,                                \
 194               "file %s: line %d (%s): assertion failed: (%s)",  \
 195               __FILE__,                                         \
 196               __LINE__,                                         \
 197               __PRETTY_FUNCTION__,                              \
 198               #expr);                   }G_STMT_END
 199
 200 #define g_assert_not_reached()          G_STMT_START{           \
 201      g_log (G_LOG_DOMAIN,                                       \
 202             G_LOG_LEVEL_ERROR,                                  \
 203             "file %s: line %d (%s): should not be reached",     \
 204             __FILE__,                                           \
 205             __LINE__,                                           \
 206             __PRETTY_FUNCTION__);       }G_STMT_END
 207
 208 #else /* !__GNUC__ */
 209
 210 #define g_assert(expr)                  G_STMT_START{           \
 211      if (!(expr))                                               \
 212        g_log (G_LOG_DOMAIN,                                     \
 213               G_LOG_LEVEL_ERROR,                                \
 214               "file %s: line %d: assertion failed: (%s)",       \
 215               __FILE__,                                         \
 216               __LINE__,                                         \
 217               #expr);                   }G_STMT_END
 218
 219 #define g_assert_not_reached()          G_STMT_START{   \
 220      g_log (G_LOG_DOMAIN,                               \
 221             G_LOG_LEVEL_ERROR,                          \
 222             "file %s: line %d: should not be reached",  \
 223             __FILE__,                                   \
 224             __LINE__);          }G_STMT_END
 225
 226 #endif /* __GNUC__ */
 227
 228 #endif /* !G_DISABLE_ASSERT */
 229
 230
 231 #ifdef G_DISABLE_CHECKS
 232
 233 #define g_return_if_fail(expr)                  G_STMT_START{ }G_STMT_END
 234 #define g_return_val_if_fail(expr,val)          G_STMT_START{ }G_STMT_END
 235 #define g_return_if_reached()                   G_STMT_START{ return; }G_STMT_END
 236 #define g_return_val_if_reached(val)            G_STMT_START{ return (val); }G_STMT_END
 237
 238 #else /* !G_DISABLE_CHECKS */
 239
 240 #ifdef __GNUC__
 241
 242 #define g_return_if_fail(expr)          G_STMT_START{                   \
 243      if (!(expr))                                                       \
 244        {                                                                \
 245          g_log (G_LOG_DOMAIN,                                           \
 246                 G_LOG_LEVEL_CRITICAL,                                   \
 247                 "file %s: line %d (%s): assertion `%s' failed",         \
 248                 __FILE__,                                               \
 249                 __LINE__,                                               \
 250                 __PRETTY_FUNCTION__,                                    \
 251                 #expr);                                                 \
 252          return;                                                        \
 253        };                               }G_STMT_END
 254
 255 #define g_return_val_if_fail(expr,val)  G_STMT_START{                   \
 256      if (!(expr))                                                       \
 257        {                                                                \
 258          g_log (G_LOG_DOMAIN,                                           \
 259                 G_LOG_LEVEL_CRITICAL,                                   \
 260                 "file %s: line %d (%s): assertion `%s' failed",         \
 261                 __FILE__,                                               \
 262                 __LINE__,                                               \
 263                 __PRETTY_FUNCTION__,                                    \
 264                 #expr);                                                 \
 265          return (val);                                                  \
 266        };                               }G_STMT_END
 267
 268 #define g_return_if_reached()           G_STMT_START{                   \
 269      g_log (G_LOG_DOMAIN,                                               \
 270             G_LOG_LEVEL_CRITICAL,                                       \
 271             "file %s: line %d (%s): should not be reached",             \
 272             __FILE__,                                                   \
 273             __LINE__,                                                   \
 274             __PRETTY_FUNCTION__);                                       \
 275      return;                            }G_STMT_END
 276
 277 #define g_return_val_if_reached(val)    G_STMT_START{                   \
 278      g_log (G_LOG_DOMAIN,                                               \
 279             G_LOG_LEVEL_CRITICAL,                                       \
 280             "file %s: line %d (%s): should not be reached",             \
 281             __FILE__,                                                   \
 282             __LINE__,                                                   \
 283             __PRETTY_FUNCTION__);                                       \
 284      return (val);                      }G_STMT_END
 285
 286 #else /* !__GNUC__ */
 287
 288 #define g_return_if_fail(expr)          G_STMT_START{           \
 289      if (!(expr))                                               \
 290        {                                                        \
 291          g_log (G_LOG_DOMAIN,                                   \
 292                 G_LOG_LEVEL_CRITICAL,                           \
 293                 "file %s: line %d: assertion `%s' failed",      \
 294                 __FILE__,                                       \
 295                 __LINE__,                                       \
 296                 #expr);                                         \
 297          return;                                                \
 298        };                               }G_STMT_END
 299
 300 #define g_return_val_if_fail(expr, val) G_STMT_START{           \
 301      if (!(expr))                                               \
 302        {                                                        \
 303          g_log (G_LOG_DOMAIN,                                   \
 304                 G_LOG_LEVEL_CRITICAL,                           \
 305                 "file %s: line %d: assertion `%s' failed",      \
 306                 __FILE__,                                       \
 307                 __LINE__,                                       \
 308                 #expr);                                         \
 309          return (val);                                          \
 310        };                               }G_STMT_END
 311
 312 #define g_return_if_reached()           G_STMT_START{           \
 313      g_log (G_LOG_DOMAIN,                                       \
 314             G_LOG_LEVEL_CRITICAL,                               \
 315             "file %s: line %d: should not be reached",          \
 316             __FILE__,                                           \
 317             __LINE__);                                          \
 318      return;                            }G_STMT_END
 319
 320 #define g_return_val_if_reached(val)    G_STMT_START{           \
 321      g_log (G_LOG_DOMAIN,                                       \
 322             G_LOG_LEVEL_CRITICAL,                               \
 323             "file %s: line %d: should not be reached",          \
 324             __FILE__,                                           \
 325             __LINE__);                                          \
 326      return (val);                      }G_STMT_END
 327
 328 #endif /* !__GNUC__ */
 329
 330 #endif /* !G_DISABLE_CHECKS */
 331
 332 G_END_DECLS
 333
 334 #endif /* __G_MESSAGES_H__ */
 335