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 #include <glib/gmacros.h>
  33
  34 /* Suppress warnings when GCC is in -pedantic mode and not -std=c99
  35  */
  36 #if (__GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96))
  37 #pragma GCC system_header
  38 #endif
  39
  40 G_BEGIN_DECLS
  41
  42 /* calculate a string size, guaranteed to fit format + args.
  43  */
  44 gsize   g_printf_string_upper_bound (const gchar* format,
  45                                      va_list      args);
  46
  47 /* Log level shift offset for user defined
  48  * log levels (0-7 are used by GLib).
  49  */
  50 #define G_LOG_LEVEL_USER_SHIFT  (8)
  51
  52 /* Glib log levels and flags.
  53  */
  54 typedef enum
  55 {
  56   /* log flags */
  57   G_LOG_FLAG_RECURSION          = 1 << 0,
  58   G_LOG_FLAG_FATAL              = 1 << 1,
  59
  60   /* GLib log levels */
  61   G_LOG_LEVEL_ERROR             = 1 << 2,       /* always fatal */
  62   G_LOG_LEVEL_CRITICAL          = 1 << 3,
  63   G_LOG_LEVEL_WARNING           = 1 << 4,
  64   G_LOG_LEVEL_MESSAGE           = 1 << 5,
  65   G_LOG_LEVEL_INFO              = 1 << 6,
  66   G_LOG_LEVEL_DEBUG             = 1 << 7,
  67
  68   G_LOG_LEVEL_MASK              = ~(G_LOG_FLAG_RECURSION | G_LOG_FLAG_FATAL)
  69 } GLogLevelFlags;
  70
  71 /* GLib log levels that are considered fatal by default */
  72 #define G_LOG_FATAL_MASK        (G_LOG_FLAG_RECURSION | G_LOG_LEVEL_ERROR)
  73
  74 typedef void            (*GLogFunc)             (const gchar   *log_domain,
  75                                                  GLogLevelFlags log_level,
  76                                                  const gchar   *message,
  77                                                  gpointer       user_data);
  78
  79 /* Logging mechanism
  80  */
  81 guint           g_log_set_handler       (const gchar    *log_domain,
  82                                          GLogLevelFlags  log_levels,
  83                                          GLogFunc        log_func,
  84                                          gpointer        user_data);
  85 void            g_log_remove_handler    (const gchar    *log_domain,
  86                                          guint           handler_id);
  87 void            g_log_default_handler   (const gchar    *log_domain,
  88                                          GLogLevelFlags  log_level,
  89                                          const gchar    *message,
  90                                          gpointer        unused_data);
  91 GLogFunc        g_log_set_default_handler (GLogFunc      log_func,
  92                                            gpointer      user_data);
  93 void            g_log                   (const gchar    *log_domain,
  94                                          GLogLevelFlags  log_level,
  95                                          const gchar    *format,
  96                                          ...) G_GNUC_PRINTF (3, 4);
  97 void            g_logv                  (const gchar    *log_domain,
  98                                          GLogLevelFlags  log_level,
  99                                          const gchar    *format,
 100                                          va_list         args);
 101 GLogLevelFlags  g_log_set_fatal_mask    (const gchar    *log_domain,
 102                                          GLogLevelFlags  fatal_mask);
 103 GLogLevelFlags  g_log_set_always_fatal  (GLogLevelFlags  fatal_mask);
 104
 105 /* internal */
 106 void    _g_log_fallback_handler (const gchar   *log_domain,
 107                                  GLogLevelFlags log_level,
 108                                  const gchar   *message,
 109                                  gpointer       unused_data) G_GNUC_INTERNAL;
 110
 111 /* Internal functions, used to implement the following macros */
 112 void g_return_if_fail_warning (const char *log_domain,
 113                                const char *pretty_function,
 114                                const char *expression);
 115 void g_assert_warning         (const char *log_domain,
 116                                const char *file,
 117                                const int   line,
 118                                const char *pretty_function,
 119                                const char *expression) G_GNUC_NORETURN;
 120
 121
 122 #ifndef G_LOG_DOMAIN
 123 #define G_LOG_DOMAIN    ((gchar*) 0)
 124 #endif  /* G_LOG_DOMAIN */
 125 #ifdef G_HAVE_ISO_VARARGS
 126 #define g_error(...)    g_log (G_LOG_DOMAIN,         \
 127                                G_LOG_LEVEL_ERROR,    \
 128                                __VA_ARGS__)
 129 #define g_message(...)  g_log (G_LOG_DOMAIN,         \
 130                                G_LOG_LEVEL_MESSAGE,  \
 131                                __VA_ARGS__)
 132 #define g_critical(...) g_log (G_LOG_DOMAIN,         \
 133                                G_LOG_LEVEL_CRITICAL, \
 134                                __VA_ARGS__)
 135 #define g_warning(...)  g_log (G_LOG_DOMAIN,         \
 136                                G_LOG_LEVEL_WARNING,  \
 137                                __VA_ARGS__)
 138 #define g_debug(...)    g_log (G_LOG_DOMAIN,         \
 139                                G_LOG_LEVEL_DEBUG,    \
 140                                __VA_ARGS__)
 141 #elif defined(G_HAVE_GNUC_VARARGS)
 142 #define g_error(format...)      g_log (G_LOG_DOMAIN,         \
 143                                        G_LOG_LEVEL_ERROR,    \
 144                                        format)
 145 #define g_message(format...)    g_log (G_LOG_DOMAIN,         \
 146                                        G_LOG_LEVEL_MESSAGE,  \
 147                                        format)
 148 #define g_critical(format...)   g_log (G_LOG_DOMAIN,         \
 149                                        G_LOG_LEVEL_CRITICAL, \
 150                                        format)
 151 #define g_warning(format...)    g_log (G_LOG_DOMAIN,         \
 152                                        G_LOG_LEVEL_WARNING,  \
 153                                        format)
 154 #define g_debug(format...)      g_log (G_LOG_DOMAIN,         \
 155                                        G_LOG_LEVEL_DEBUG,    \
 156                                        format)
 157 #else   /* no varargs macros */
 158 static void
 159 g_error (const gchar *format,
 160          ...)
 161 {
 162   va_list args;
 163   va_start (args, format);
 164   g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_ERROR, format, args);
 165   va_end (args);
 166 }
 167 static void
 168 g_message (const gchar *format,
 169            ...)
 170 {
 171   va_list args;
 172   va_start (args, format);
 173   g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_MESSAGE, format, args);
 174   va_end (args);
 175 }
 176 static void
 177 g_critical (const gchar *format,
 178             ...)
 179 {
 180   va_list args;
 181   va_start (args, format);
 182   g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL, format, args);
 183   va_end (args);
 184 }
 185 static void
 186 g_warning (const gchar *format,
 187            ...)
 188 {
 189   va_list args;
 190   va_start (args, format);
 191   g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_WARNING, format, args);
 192   va_end (args);
 193 }
 194 static void
 195 g_debug (const gchar *format,
 196          ...)
 197 {
 198   va_list args;
 199   va_start (args, format);
 200   g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, format, args);
 201   va_end (args);
 202 }
 203 #endif  /* !__GNUC__ */
 204
 205 typedef void    (*GPrintFunc)           (const gchar    *string);
 206 void            g_print                 (const gchar    *format,
 207                                          ...) G_GNUC_PRINTF (1, 2);
 208 GPrintFunc      g_set_print_handler     (GPrintFunc      func);
 209 void            g_printerr              (const gchar    *format,
 210                                          ...) G_GNUC_PRINTF (1, 2);
 211 GPrintFunc      g_set_printerr_handler  (GPrintFunc      func);
 212
 213
 214 /* Provide macros for error handling. The "assert" macros will
 215  *  exit on failure. The "return" macros will exit the current
 216  *  function. Two different definitions are given for the macros
 217  *  if G_DISABLE_ASSERT is not defined, in order to support gcc's
 218  *  __PRETTY_FUNCTION__ capability.
 219  */
 220
 221 #ifdef G_DISABLE_ASSERT
 222
 223 #define g_assert(expr)          G_STMT_START{ (void)0; }G_STMT_END
 224 #define g_assert_not_reached()  G_STMT_START{ (void)0; }G_STMT_END
 225
 226 #else /* !G_DISABLE_ASSERT */
 227
 228 #ifdef __GNUC__
 229
 230 #define g_assert(expr)                  G_STMT_START{           \
 231      if G_LIKELY(expr) { } else                                 \
 232         g_assert_warning (G_LOG_DOMAIN,                         \
 233                           __FILE__,                             \
 234                           __LINE__,                             \
 235                           __PRETTY_FUNCTION__,                  \
 236                           #expr);                 }G_STMT_END
 237
 238 #define g_assert_not_reached()          G_STMT_START{           \
 239         g_assert_warning (G_LOG_DOMAIN,                         \
 240                           __FILE__,                             \
 241                           __LINE__,                             \
 242                           __PRETTY_FUNCTION__,                  \
 243                           NULL);                  }G_STMT_END
 244
 245 #else /* !__GNUC__ */
 246
 247 #define g_assert(expr)                  G_STMT_START{           \
 248      if (expr) { } else                                         \
 249        g_log (G_LOG_DOMAIN,                                     \
 250               G_LOG_LEVEL_ERROR,                                \
 251               "file %s: line %d: assertion failed: (%s)",       \
 252               __FILE__,                                         \
 253               __LINE__,                                         \
 254               #expr);                   }G_STMT_END
 255
 256 #define g_assert_not_reached()          G_STMT_START{   \
 257      g_log (G_LOG_DOMAIN,                               \
 258             G_LOG_LEVEL_ERROR,                          \
 259             "file %s: line %d: should not be reached",  \
 260             __FILE__,                                   \
 261             __LINE__);          }G_STMT_END
 262
 263 #endif /* __GNUC__ */
 264
 265 #endif /* !G_DISABLE_ASSERT */
 266
 267
 268 #ifdef G_DISABLE_CHECKS
 269
 270 #define g_return_if_fail(expr)                  G_STMT_START{ (void)0; }G_STMT_END
 271 #define g_return_val_if_fail(expr,val)          G_STMT_START{ (void)0; }G_STMT_END
 272 #define g_return_if_reached()                   G_STMT_START{ return; }G_STMT_END
 273 #define g_return_val_if_reached(val)            G_STMT_START{ return (val); }G_STMT_END
 274
 275 #else /* !G_DISABLE_CHECKS */
 276
 277 #ifdef __GNUC__
 278
 279 #define g_return_if_fail(expr)          G_STMT_START{                   \
 280      if G_LIKELY(expr) { } else                                         \
 281        {                                                                \
 282          g_return_if_fail_warning (G_LOG_DOMAIN,                        \
 283                                    __PRETTY_FUNCTION__,                 \
 284                                    #expr);                              \
 285          return;                                                        \
 286        };                               }G_STMT_END
 287
 288 #define g_return_val_if_fail(expr,val)  G_STMT_START{                   \
 289      if G_LIKELY(expr) { } else                                         \
 290        {                                                                \
 291          g_return_if_fail_warning (G_LOG_DOMAIN,                        \
 292                                    __PRETTY_FUNCTION__,                 \
 293                                    #expr);                              \
 294          return (val);                                                  \
 295        };                               }G_STMT_END
 296
 297 #define g_return_if_reached()           G_STMT_START{                   \
 298      g_log (G_LOG_DOMAIN,                                               \
 299             G_LOG_LEVEL_CRITICAL,                                       \
 300             "file %s: line %d (%s): should not be reached",             \
 301             __FILE__,                                                   \
 302             __LINE__,                                                   \
 303             __PRETTY_FUNCTION__);                                       \
 304      return;                            }G_STMT_END
 305
 306 #define g_return_val_if_reached(val)    G_STMT_START{                   \
 307      g_log (G_LOG_DOMAIN,                                               \
 308             G_LOG_LEVEL_CRITICAL,                                       \
 309             "file %s: line %d (%s): should not be reached",             \
 310             __FILE__,                                                   \
 311             __LINE__,                                                   \
 312             __PRETTY_FUNCTION__);                                       \
 313      return (val);                      }G_STMT_END
 314
 315 #else /* !__GNUC__ */
 316
 317 #define g_return_if_fail(expr)          G_STMT_START{           \
 318      if (expr) { } else                                         \
 319        {                                                        \
 320          g_log (G_LOG_DOMAIN,                                   \
 321                 G_LOG_LEVEL_CRITICAL,                           \
 322                 "file %s: line %d: assertion `%s' failed",      \
 323                 __FILE__,                                       \
 324                 __LINE__,                                       \
 325                 #expr);                                         \
 326          return;                                                \
 327        };                               }G_STMT_END
 328
 329 #define g_return_val_if_fail(expr, val) G_STMT_START{           \
 330      if (expr) { } else                                         \
 331        {                                                        \
 332          g_log (G_LOG_DOMAIN,                                   \
 333                 G_LOG_LEVEL_CRITICAL,                           \
 334                 "file %s: line %d: assertion `%s' failed",      \
 335                 __FILE__,                                       \
 336                 __LINE__,                                       \
 337                 #expr);                                         \
 338          return (val);                                          \
 339        };                               }G_STMT_END
 340
 341 #define g_return_if_reached()           G_STMT_START{           \
 342      g_log (G_LOG_DOMAIN,                                       \
 343             G_LOG_LEVEL_CRITICAL,                               \
 344             "file %s: line %d: should not be reached",          \
 345             __FILE__,                                           \
 346             __LINE__);                                          \
 347      return;                            }G_STMT_END
 348
 349 #define g_return_val_if_reached(val)    G_STMT_START{           \
 350      g_log (G_LOG_DOMAIN,                                       \
 351             G_LOG_LEVEL_CRITICAL,                               \
 352             "file %s: line %d: should not be reached",          \
 353             __FILE__,                                           \
 354             __LINE__);                                          \
 355      return (val);                      }G_STMT_END
 356
 357 #endif /* !__GNUC__ */
 358
 359 #endif /* !G_DISABLE_CHECKS */
 360
 361 G_END_DECLS
 362
 363 #endif /* __G_MESSAGES_H__ */
 364