dbus-errors.c

/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/* dbus-errors.c Error reporting
 *
 * Copyright (C) 2002, 2004  Red Hat Inc.
 * Copyright (C) 2003  CodeFactory AB
 *
 * Licensed under the Academic Free License version 2.1
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
#include "dbus-errors.h"
#include "dbus-internals.h"
#include "dbus-string.h"
#include "dbus-protocol.h"
#include <stdarg.h>
#include <string.h>

typedef struct
{
  char *name; 
  char *message; 
  unsigned int const_message : 1; 
  unsigned int dummy2 : 1; 
  unsigned int dummy3 : 1; 
  unsigned int dummy4 : 1; 
  unsigned int dummy5 : 1; 
  void *padding1; 
} DBusRealError;

static const char*
message_from_error (const char *error)
{
  if (strcmp (error, DBUS_ERROR_FAILED) == 0)
    return "Unknown error";
  else if (strcmp (error, DBUS_ERROR_NO_MEMORY) == 0)
    return "Not enough memory available";
  else if (strcmp (error, DBUS_ERROR_IO_ERROR) == 0)
    return "Error reading or writing data";
  else if (strcmp (error, DBUS_ERROR_BAD_ADDRESS) == 0)
    return "Could not parse address";
  else if (strcmp (error, DBUS_ERROR_NOT_SUPPORTED) == 0)
    return "Feature not supported";
  else if (strcmp (error, DBUS_ERROR_LIMITS_EXCEEDED) == 0)
    return "Resource limits exceeded";
  else if (strcmp (error, DBUS_ERROR_ACCESS_DENIED) == 0)
    return "Permission denied";
  else if (strcmp (error, DBUS_ERROR_AUTH_FAILED) == 0)
    return "Could not authenticate to server";
  else if (strcmp (error, DBUS_ERROR_NO_SERVER) == 0)
    return "No server available at address";
  else if (strcmp (error, DBUS_ERROR_TIMEOUT) == 0)
    return "Connection timed out";
  else if (strcmp (error, DBUS_ERROR_NO_NETWORK) == 0)
    return "Network unavailable";
  else if (strcmp (error, DBUS_ERROR_ADDRESS_IN_USE) == 0)
    return "Address already in use";
  else if (strcmp (error, DBUS_ERROR_DISCONNECTED) == 0)
    return "Disconnected.";
  else if (strcmp (error, DBUS_ERROR_INVALID_ARGS) == 0)
    return "Invalid arguments.";
  else if (strcmp (error, DBUS_ERROR_NO_REPLY) == 0)
    return "Did not get a reply message.";
  else if (strcmp (error, DBUS_ERROR_FILE_NOT_FOUND) == 0)
    return "File doesn't exist.";
  else if (strcmp (error, DBUS_ERROR_OBJECT_PATH_IN_USE) == 0)
    return "Object path already in use";
  else
    return error;
}
 /* End of internals */

void
dbus_error_init (DBusError *error)
{
  DBusRealError *real;

  _dbus_return_if_fail (error != NULL);

  _dbus_assert (sizeof (DBusError) == sizeof (DBusRealError));

  real = (DBusRealError *)error;
  
  real->name = NULL;  
  real->message = NULL;

  real->const_message = TRUE;
}

void
dbus_error_free (DBusError *error)
{
  DBusRealError *real;

  _dbus_return_if_fail (error != NULL);
  
  real = (DBusRealError *)error;

  if (!real->const_message)
    {
      dbus_free (real->name);
      dbus_free (real->message);
    }

  dbus_error_init (error);
}

void
dbus_set_error_const (DBusError  *error,
                      const char *name,
                      const char *message)
{
  DBusRealError *real;

  _dbus_return_if_error_is_set (error);
  _dbus_return_if_fail (name != NULL);
  
  if (error == NULL)
    return;

  _dbus_assert (error->name == NULL);
  _dbus_assert (error->message == NULL);

  if (message == NULL)
    message = message_from_error (name);
  
  real = (DBusRealError *)error;
  
  real->name = (char*) name;
  real->message = (char *)message;
  real->const_message = TRUE;
}

void
dbus_move_error (DBusError *src,
                 DBusError *dest)
{
  _dbus_return_if_error_is_set (dest);

  if (dest)
    {
      dbus_error_free (dest);
      *dest = *src;
      dbus_error_init (src);
    }
  else
    dbus_error_free (src);
}

dbus_bool_t
dbus_error_has_name (const DBusError *error,
                     const char      *name)
{
  _dbus_return_val_if_fail (error != NULL, FALSE);
  _dbus_return_val_if_fail (name != NULL, FALSE);

  _dbus_assert ((error->name != NULL && error->message != NULL) ||
                (error->name == NULL && error->message == NULL));
  
  if (error->name != NULL)
    {
      DBusString str1, str2;
      _dbus_string_init_const (&str1, error->name);
      _dbus_string_init_const (&str2, name);
      return _dbus_string_equal (&str1, &str2);
    }
  else
    return FALSE;
}

dbus_bool_t
dbus_error_is_set (const DBusError *error)
{
  _dbus_return_val_if_fail (error != NULL, FALSE);  
  _dbus_assert ((error->name != NULL && error->message != NULL) ||
                (error->name == NULL && error->message == NULL));
  return error->name != NULL;
}

void
dbus_set_error (DBusError  *error,
                const char *name,
                const char *format,
                ...)
{
  DBusRealError *real;
  DBusString str;
  va_list args;
  
  if (error == NULL)
    return;

  /* it's a bug to pile up errors */
  _dbus_return_if_error_is_set (error);
  _dbus_return_if_fail (name != NULL);
  
  _dbus_assert (error->name == NULL);
  _dbus_assert (error->message == NULL);

  if (!_dbus_string_init (&str))
    goto nomem;
  
  if (format == NULL)
    {
      if (!_dbus_string_append (&str,
                                message_from_error (name)))
        {
          _dbus_string_free (&str);
          goto nomem;
        }
    }
  else
    {
      va_start (args, format);
      if (!_dbus_string_append_printf_valist (&str, format, args))
        {
          _dbus_string_free (&str);
          va_end (args);
          goto nomem;
        }
      va_end (args);
    }

  real = (DBusRealError *)error;

  if (!_dbus_string_steal_data (&str, &real->message))
    {
      _dbus_string_free (&str);
      goto nomem;
    }
  _dbus_string_free (&str);
  
  real->name = _dbus_strdup (name);
  if (real->name == NULL)
    {
      dbus_free (real->message);
      real->message = NULL;
      goto nomem;
    }
  real->const_message = FALSE;

  return;
  
 nomem:
  _DBUS_SET_OOM (error);
}
 /* End public API */

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