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, guarranteed 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 void            g_log                   (const gchar    *log_domain,
  92                                          GLogLevelFlags  log_level,
  93                                          const gchar    *format,
  94                                          ...) G_GNUC_PRINTF (3, 4);
  95 void            g_logv                  (const gchar    *log_domain,
  96                                          GLogLevelFlags  log_level,
  97                                          const gchar    *format,
  98                                          va_list         args);
  99 GLogLevelFlags  g_log_set_fatal_mask    (const gchar    *log_domain,
 100                                          GLogLevelFlags  fatal_mask);
 101 GLogLevelFlags  g_log_set_always_fatal  (GLogLevelFlags  fatal_mask);
 102
 103 /* internal */
 104 void    _g_log_fallback_handler (const gchar   *log_domain,
 105                                  GLogLevelFlags log_level,
 106                                  const gchar   *message,
 107                                  gpointer       unused_data);
 108
 109
 110 #ifndef G_LOG_DOMAIN
 111 #define G_LOG_DOMAIN    ((gchar*) 0)
 112 #endif  /* G_LOG_DOMAIN */
 113 #ifdef G_HAVE_ISO_VARARGS
 114 #define g_error(...)    g_log (G_LOG_DOMAIN,         \
 115                                G_LOG_LEVEL_ERROR,    \
 116                                __VA_ARGS__)
 117 #define g_message(...)  g_log (G_LOG_DOMAIN,         \
 118                                G_LOG_LEVEL_MESSAGE,  \
 119                                __VA_ARGS__)
 120 #define g_critical(...) g_log (G_LOG_DOMAIN,         \
 121                                G_LOG_LEVEL_CRITICAL, \
 122                                __VA_ARGS__)
 123 #define g_warning(...)  g_log (G_LOG_DOMAIN,         \
 124                                G_LOG_LEVEL_WARNING,  \
 125                                __VA_ARGS__)
 126 #elif defined(G_HAVE_GNUC_VARARGS)
 127 #define g_error(format...)      g_log (G_LOG_DOMAIN,         \
 128                                        G_LOG_LEVEL_ERROR,    \
 129                                        format)
 130 #define g_message(format...)    g_log (G_LOG_DOMAIN,         \
 131                                        G_LOG_LEVEL_MESSAGE,  \
 132                                        format)
 133 #define g_critical(format...)   g_log (G_LOG_DOMAIN,         \
 134                                        G_LOG_LEVEL_CRITICAL, \
 135                                        format)
 136 #define g_warning(format...)    g_log (G_LOG_DOMAIN,         \
 137                                        G_LOG_LEVEL_WARNING,  \
 138                                        format)
 139 #else   /* no varargs macros */
 140 static void
 141 g_error (const gchar *format,
 142          ...)
 143 {
 144   va_list args;
 145   va_start (args, format);
 146   g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_ERROR, format, args);
 147   va_end (args);
 148 }
 149 static void
 150 g_message (const gchar *format,
 151            ...)
 152 {
 153   va_list args;
 154   va_start (args, format);
 155   g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_MESSAGE, format, args);
 156   va_end (args);
 157 }
 158 static void
 159 g_critical (const gchar *format,
 160             ...)
 161 {
 162   va_list args;
 163   va_start (args, format);
 164   g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL, format, args);
 165   va_end (args);
 166 }
 167 static void
 168 g_warning (const gchar *format,
 169            ...)
 170 {
 171   va_list args;
 172   va_start (args, format);
 173   g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_WARNING, format, args);
 174   va_end (args);
 175 }
 176 #endif  /* !__GNUC__ */
 177
 178 typedef void    (*GPrintFunc)           (const gchar    *string);
 179 void            g_print                 (const gchar    *format,
 180                                          ...) G_GNUC_PRINTF (1, 2);
 181 GPrintFunc      g_set_print_handler     (GPrintFunc      func);
 182 void            g_printerr              (const gchar    *format,
 183                                          ...) G_GNUC_PRINTF (1, 2);
 184 GPrintFunc      g_set_printerr_handler  (GPrintFunc      func);
 185
 186
 187 /* Provide macros for error handling. The "assert" macros will
 188  *  exit on failure. The "return" macros will exit the current
 189  *  function. Two different definitions are given for the macros
 190  *  if G_DISABLE_ASSERT is not defined, in order to support gcc's
 191  *  __PRETTY_FUNCTION__ capability.
 192  */
 193
 194 #ifdef G_DISABLE_ASSERT
 195
 196 #define g_assert(expr)          G_STMT_START{ (void)0; }G_STMT_END
 197 #define g_assert_not_reached()  G_STMT_START{ (void)0; }G_STMT_END
 198
 199 #else /* !G_DISABLE_ASSERT */
 200
 201 #if defined(__GNUC__) && (__GNUC__ > 2)  && defined(__OPTIMIZE__)
 202
 203 #define g_assert(expr)                  G_STMT_START{           \
 204      if (!G_LIKELY (expr))                                      \
 205        g_log (G_LOG_DOMAIN,                                     \
 206               G_LOG_LEVEL_ERROR,                                \
 207               "file %s: line %d (%s): assertion failed: (%s)",  \
 208               __FILE__,                                         \
 209               __LINE__,                                         \
 210               __PRETTY_FUNCTION__,                              \
 211               #expr);                   }G_STMT_END
 212
 213 #define g_assert_not_reached()          G_STMT_START{           \
 214      g_log (G_LOG_DOMAIN,                                       \
 215             G_LOG_LEVEL_ERROR,                                  \
 216             "file %s: line %d (%s): should not be reached",     \
 217             __FILE__,                                           \
 218             __LINE__,                                           \
 219             __PRETTY_FUNCTION__);       }G_STMT_END
 220
 221 #else /* !__GNUC__ */
 222
 223 #define g_assert(expr)                  G_STMT_START{           \
 224      if (expr) { } else                                         \
 225        g_log (G_LOG_DOMAIN,                                     \
 226               G_LOG_LEVEL_ERROR,                                \
 227               "file %s: line %d: assertion failed: (%s)",       \
 228               __FILE__,                                         \
 229               __LINE__,                                         \
 230               #expr);                   }G_STMT_END
 231
 232 #define g_assert_not_reached()          G_STMT_START{   \
 233      g_log (G_LOG_DOMAIN,                               \
 234             G_LOG_LEVEL_ERROR,                          \
 235             "file %s: line %d: should not be reached",  \
 236             __FILE__,                                   \
 237             __LINE__);          }G_STMT_END
 238
 239 #endif /* __GNUC__ */
 240
 241 #endif /* !G_DISABLE_ASSERT */
 242
 243
 244 #ifdef G_DISABLE_CHECKS
 245
 246 #define g_return_if_fail(expr)                  G_STMT_START{ (void)0; }G_STMT_END
 247 #define g_return_val_if_fail(expr,val)          G_STMT_START{ (void)0; }G_STMT_END
 248 #define g_return_if_reached()                   G_STMT_START{ return; }G_STMT_END
 249 #define g_return_val_if_reached(val)            G_STMT_START{ return (val); }G_STMT_END
 250
 251 #else /* !G_DISABLE_CHECKS */
 252
 253 #if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
 254
 255 #define g_return_if_fail(expr)          G_STMT_START{                   \
 256      if (!G_LIKELY (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;                                                        \
 266        };                               }G_STMT_END
 267
 268 #define g_return_val_if_fail(expr,val)  G_STMT_START{                   \
 269      if (!G_LIKELY (expr))                                              \
 270        {                                                                \
 271          g_log (G_LOG_DOMAIN,                                           \
 272                 G_LOG_LEVEL_CRITICAL,                                   \
 273                 "file %s: line %d (%s): assertion `%s' failed",         \
 274                 __FILE__,                                               \
 275                 __LINE__,                                               \
 276                 __PRETTY_FUNCTION__,                                    \
 277                 #expr);                                                 \
 278          return (val);                                                  \
 279        };                               }G_STMT_END
 280
 281 #define g_return_if_reached()           G_STMT_START{                   \
 282      g_log (G_LOG_DOMAIN,                                               \
 283             G_LOG_LEVEL_CRITICAL,                                       \
 284             "file %s: line %d (%s): should not be reached",             \
 285             __FILE__,                                                   \
 286             __LINE__,                                                   \
 287             __PRETTY_FUNCTION__);                                       \
 288      return;                            }G_STMT_END
 289
 290 #define g_return_val_if_reached(val)    G_STMT_START{                   \
 291      g_log (G_LOG_DOMAIN,                                               \
 292             G_LOG_LEVEL_CRITICAL,                                       \
 293             "file %s: line %d (%s): should not be reached",             \
 294             __FILE__,                                                   \
 295             __LINE__,                                                   \
 296             __PRETTY_FUNCTION__);                                       \
 297      return (val);                      }G_STMT_END
 298
 299 #else /* !__GNUC__ */
 300
 301 #define g_return_if_fail(expr)          G_STMT_START{           \
 302      if (expr) { } else                                         \
 303        {                                                        \
 304          g_log (G_LOG_DOMAIN,                                   \
 305                 G_LOG_LEVEL_CRITICAL,                           \
 306                 "file %s: line %d: assertion `%s' failed",      \
 307                 __FILE__,                                       \
 308                 __LINE__,                                       \
 309                 #expr);                                         \
 310          return;                                                \
 311        };                               }G_STMT_END
 312
 313 #define g_return_val_if_fail(expr, val) G_STMT_START{           \
 314      if (expr) { } else                                         \
 315        {                                                        \
 316          g_log (G_LOG_DOMAIN,                                   \
 317                 G_LOG_LEVEL_CRITICAL,                           \
 318                 "file %s: line %d: assertion `%s' failed",      \
 319                 __FILE__,                                       \
 320                 __LINE__,                                       \
 321                 #expr);                                         \
 322          return (val);                                          \
 323        };                               }G_STMT_END
 324
 325 #define g_return_if_reached()           G_STMT_START{           \
 326      g_log (G_LOG_DOMAIN,                                       \
 327             G_LOG_LEVEL_CRITICAL,                               \
 328             "file %s: line %d: should not be reached",          \
 329             __FILE__,                                           \
 330             __LINE__);                                          \
 331      return;                            }G_STMT_END
 332
 333 #define g_return_val_if_reached(val)    G_STMT_START{           \
 334      g_log (G_LOG_DOMAIN,                                       \
 335             G_LOG_LEVEL_CRITICAL,                               \
 336             "file %s: line %d: should not be reached",          \
 337             __FILE__,                                           \
 338             __LINE__);                                          \
 339      return (val);                      }G_STMT_END
 340
 341 #endif /* !__GNUC__ */
 342
 343 #endif /* !G_DISABLE_CHECKS */
 344
 345 G_END_DECLS
 346
 347 #endif /* __G_MESSAGES_H__ */
 348