dbus-errors.c

00001 /* -*- mode: C; c-file-style: "gnu" -*- */
00002 /* dbus-errors.c Error reporting
00003  *
00004  * Copyright (C) 2002, 2004  Red Hat Inc.
00005  * Copyright (C) 2003  CodeFactory AB
00006  *
00007  * Licensed under the Academic Free License version 2.1
00008  * 
00009  * This program is free software; you can redistribute it and/or modify
00010  * it under the terms of the GNU General Public License as published by
00011  * the Free Software Foundation; either version 2 of the License, or
00012  * (at your option) any later version.
00013  *
00014  * This program is distributed in the hope that it will be useful,
00015  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00016  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00017  * GNU General Public License for more details.
00018  * 
00019  * You should have received a copy of the GNU General Public License
00020  * along with this program; if not, write to the Free Software
00021  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00022  *
00023  */
00024 #include "dbus-errors.h"
00025 #include "dbus-internals.h"
00026 #include "dbus-string.h"
00027 #include "dbus-protocol.h"
00028 #include <stdarg.h>
00029 #include <string.h>
00030 
00041 typedef struct
00042 {
00043   char *name; 
00044   char *message; 
00046   unsigned int const_message : 1; 
00048   unsigned int dummy2 : 1; 
00049   unsigned int dummy3 : 1; 
00050   unsigned int dummy4 : 1; 
00051   unsigned int dummy5 : 1; 
00053   void *padding1; 
00055 } DBusRealError;
00056 
00065 static const char*
00066 message_from_error (const char *error)
00067 {
00068   if (strcmp (error, DBUS_ERROR_FAILED) == 0)
00069     return "Unknown error";
00070   else if (strcmp (error, DBUS_ERROR_NO_MEMORY) == 0)
00071     return "Not enough memory available";
00072   else if (strcmp (error, DBUS_ERROR_IO_ERROR) == 0)
00073     return "Error reading or writing data";
00074   else if (strcmp (error, DBUS_ERROR_BAD_ADDRESS) == 0)
00075     return "Could not parse address";
00076   else if (strcmp (error, DBUS_ERROR_NOT_SUPPORTED) == 0)
00077     return "Feature not supported";
00078   else if (strcmp (error, DBUS_ERROR_LIMITS_EXCEEDED) == 0)
00079     return "Resource limits exceeded";
00080   else if (strcmp (error, DBUS_ERROR_ACCESS_DENIED) == 0)
00081     return "Permission denied";
00082   else if (strcmp (error, DBUS_ERROR_AUTH_FAILED) == 0)
00083     return "Could not authenticate to server";
00084   else if (strcmp (error, DBUS_ERROR_NO_SERVER) == 0)
00085     return "No server available at address";
00086   else if (strcmp (error, DBUS_ERROR_TIMEOUT) == 0)
00087     return "Connection timed out";
00088   else if (strcmp (error, DBUS_ERROR_NO_NETWORK) == 0)
00089     return "Network unavailable";
00090   else if (strcmp (error, DBUS_ERROR_ADDRESS_IN_USE) == 0)
00091     return "Address already in use";
00092   else if (strcmp (error, DBUS_ERROR_DISCONNECTED) == 0)
00093     return "Disconnected.";
00094   else if (strcmp (error, DBUS_ERROR_INVALID_ARGS) == 0)
00095     return "Invalid arguments.";
00096   else if (strcmp (error, DBUS_ERROR_NO_REPLY) == 0)
00097     return "Did not get a reply message.";
00098   else if (strcmp (error, DBUS_ERROR_FILE_NOT_FOUND) == 0)
00099     return "File doesn't exist.";
00100   else
00101     return error;
00102 }
00103  /* End of internals */
00105 
00150 void
00151 dbus_error_init (DBusError *error)
00152 {
00153   DBusRealError *real;
00154 
00155   _dbus_return_if_fail (error != NULL);
00156 
00157   _dbus_assert (sizeof (DBusError) == sizeof (DBusRealError));
00158 
00159   real = (DBusRealError *)error;
00160   
00161   real->name = NULL;  
00162   real->message = NULL;
00163 
00164   real->const_message = TRUE;
00165 }
00166 
00173 void
00174 dbus_error_free (DBusError *error)
00175 {
00176   DBusRealError *real;
00177 
00178   _dbus_return_if_fail (error != NULL);
00179   
00180   real = (DBusRealError *)error;
00181 
00182   if (!real->const_message)
00183     {
00184       dbus_free (real->name);
00185       dbus_free (real->message);
00186     }
00187 
00188   dbus_error_init (error);
00189 }
00190 
00201 void
00202 dbus_set_error_const (DBusError  *error,
00203                       const char *name,
00204                       const char *message)
00205 {
00206   DBusRealError *real;
00207 
00208   _dbus_return_if_error_is_set (error);
00209   _dbus_return_if_fail (name != NULL);
00210   
00211   if (error == NULL)
00212     return;
00213 
00214   _dbus_assert (error->name == NULL);
00215   _dbus_assert (error->message == NULL);
00216 
00217   if (message == NULL)
00218     message = message_from_error (name);
00219   
00220   real = (DBusRealError *)error;
00221   
00222   real->name = (char*) name;
00223   real->message = (char *)message;
00224   real->const_message = TRUE;
00225 }
00226 
00237 void
00238 dbus_move_error (DBusError *src,
00239                  DBusError *dest)
00240 {
00241   _dbus_return_if_error_is_set (dest);
00242 
00243   if (dest)
00244     {
00245       dbus_error_free (dest);
00246       *dest = *src;
00247       dbus_error_init (src);
00248     }
00249   else
00250     dbus_error_free (src);
00251 }
00252 
00260 dbus_bool_t
00261 dbus_error_has_name (const DBusError *error,
00262                      const char      *name)
00263 {
00264   _dbus_return_val_if_fail (error != NULL, FALSE);
00265   _dbus_return_val_if_fail (name != NULL, FALSE);
00266 
00267   _dbus_assert ((error->name != NULL && error->message != NULL) ||
00268                 (error->name == NULL && error->message == NULL));
00269   
00270   if (error->name != NULL)
00271     {
00272       DBusString str1, str2;
00273       _dbus_string_init_const (&str1, error->name);
00274       _dbus_string_init_const (&str2, name);
00275       return _dbus_string_equal (&str1, &str2);
00276     }
00277   else
00278     return FALSE;
00279 }
00280 
00287 dbus_bool_t
00288 dbus_error_is_set (const DBusError *error)
00289 {
00290   _dbus_return_val_if_fail (error != NULL, FALSE);  
00291   _dbus_assert ((error->name != NULL && error->message != NULL) ||
00292                 (error->name == NULL && error->message == NULL));
00293   return error->name != NULL;
00294 }
00295 
00311 void
00312 dbus_set_error (DBusError  *error,
00313                 const char *name,
00314                 const char *format,
00315                 ...)
00316 {
00317   DBusRealError *real;
00318   DBusString str;
00319   va_list args;
00320   
00321   if (error == NULL)
00322     return;
00323 
00324   /* it's a bug to pile up errors */
00325   _dbus_return_if_error_is_set (error);
00326   _dbus_return_if_fail (name != NULL);
00327   
00328   _dbus_assert (error->name == NULL);
00329   _dbus_assert (error->message == NULL);
00330 
00331   if (!_dbus_string_init (&str))
00332     goto nomem;
00333   
00334   if (format == NULL)
00335     {
00336       if (!_dbus_string_append (&str,
00337                                 message_from_error (name)))
00338         {
00339           _dbus_string_free (&str);
00340           goto nomem;
00341         }
00342     }
00343   else
00344     {
00345       va_start (args, format);
00346       if (!_dbus_string_append_printf_valist (&str, format, args))
00347         {
00348           _dbus_string_free (&str);
00349           goto nomem;
00350         }
00351       va_end (args);
00352     }
00353 
00354   real = (DBusRealError *)error;
00355 
00356   if (!_dbus_string_steal_data (&str, &real->message))
00357     {
00358       _dbus_string_free (&str);
00359       goto nomem;
00360     }
00361   _dbus_string_free (&str);
00362   
00363   real->name = _dbus_strdup (name);
00364   if (real->name == NULL)
00365     {
00366       dbus_free (real->message);
00367       real->message = NULL;
00368       goto nomem;
00369     }
00370   real->const_message = FALSE;
00371 
00372   return;
00373   
00374  nomem:
00375   _DBUS_SET_OOM (error);
00376 }
00377  /* End public API */

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