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 
00159 void
00160 dbus_error_init (DBusError *error)
00161 {
00162   DBusRealError *real;
00163 
00164   _dbus_return_if_fail (error != NULL);
00165 
00166   _dbus_assert (sizeof (DBusError) == sizeof (DBusRealError));
00167 
00168   real = (DBusRealError *)error;
00169   
00170   real->name = NULL;  
00171   real->message = NULL;
00172 
00173   real->const_message = TRUE;
00174 }
00175 
00182 void
00183 dbus_error_free (DBusError *error)
00184 {
00185   DBusRealError *real;
00186 
00187   _dbus_return_if_fail (error != NULL);
00188   
00189   real = (DBusRealError *)error;
00190 
00191   if (!real->const_message)
00192     {
00193       dbus_free (real->name);
00194       dbus_free (real->message);
00195     }
00196 
00197   dbus_error_init (error);
00198 }
00199 
00214 void
00215 dbus_set_error_const (DBusError  *error,
00216                       const char *name,
00217                       const char *message)
00218 {
00219   DBusRealError *real;
00220 
00221   _dbus_return_if_error_is_set (error);
00222   _dbus_return_if_fail (name != NULL);
00223   
00224   if (error == NULL)
00225     return;
00226 
00227   _dbus_assert (error->name == NULL);
00228   _dbus_assert (error->message == NULL);
00229 
00230   if (message == NULL)
00231     message = message_from_error (name);
00232   
00233   real = (DBusRealError *)error;
00234   
00235   real->name = (char*) name;
00236   real->message = (char *)message;
00237   real->const_message = TRUE;
00238 }
00239 
00250 void
00251 dbus_move_error (DBusError *src,
00252                  DBusError *dest)
00253 {
00254   _dbus_return_if_error_is_set (dest);
00255 
00256   if (dest)
00257     {
00258       dbus_error_free (dest);
00259       *dest = *src;
00260       dbus_error_init (src);
00261     }
00262   else
00263     dbus_error_free (src);
00264 }
00265 
00273 dbus_bool_t
00274 dbus_error_has_name (const DBusError *error,
00275                      const char      *name)
00276 {
00277   _dbus_return_val_if_fail (error != NULL, FALSE);
00278   _dbus_return_val_if_fail (name != NULL, FALSE);
00279 
00280   _dbus_assert ((error->name != NULL && error->message != NULL) ||
00281                 (error->name == NULL && error->message == NULL));
00282   
00283   if (error->name != NULL)
00284     {
00285       DBusString str1, str2;
00286       _dbus_string_init_const (&str1, error->name);
00287       _dbus_string_init_const (&str2, name);
00288       return _dbus_string_equal (&str1, &str2);
00289     }
00290   else
00291     return FALSE;
00292 }
00293 
00300 dbus_bool_t
00301 dbus_error_is_set (const DBusError *error)
00302 {
00303   _dbus_return_val_if_fail (error != NULL, FALSE);  
00304   _dbus_assert ((error->name != NULL && error->message != NULL) ||
00305                 (error->name == NULL && error->message == NULL));
00306   return error->name != NULL;
00307 }
00308 
00325 void
00326 dbus_set_error (DBusError  *error,
00327                 const char *name,
00328                 const char *format,
00329                 ...)
00330 {
00331   DBusRealError *real;
00332   DBusString str;
00333   va_list args;
00334   
00335   if (error == NULL)
00336     return;
00337 
00338   /* it's a bug to pile up errors */
00339   _dbus_return_if_error_is_set (error);
00340   _dbus_return_if_fail (name != NULL);
00341   
00342   _dbus_assert (error->name == NULL);
00343   _dbus_assert (error->message == NULL);
00344 
00345   if (!_dbus_string_init (&str))
00346     goto nomem;
00347   
00348   if (format == NULL)
00349     {
00350       if (!_dbus_string_append (&str,
00351                                 message_from_error (name)))
00352         {
00353           _dbus_string_free (&str);
00354           goto nomem;
00355         }
00356     }
00357   else
00358     {
00359       va_start (args, format);
00360       if (!_dbus_string_append_printf_valist (&str, format, args))
00361         {
00362           _dbus_string_free (&str);
00363           goto nomem;
00364         }
00365       va_end (args);
00366     }
00367 
00368   real = (DBusRealError *)error;
00369 
00370   if (!_dbus_string_steal_data (&str, &real->message))
00371     {
00372       _dbus_string_free (&str);
00373       goto nomem;
00374     }
00375   _dbus_string_free (&str);
00376   
00377   real->name = _dbus_strdup (name);
00378   if (real->name == NULL)
00379     {
00380       dbus_free (real->message);
00381       real->message = NULL;
00382       goto nomem;
00383     }
00384   real->const_message = FALSE;
00385 
00386   return;
00387   
00388  nomem:
00389   _DBUS_SET_OOM (error);
00390 }
00391  /* End public API */

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