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glib/gio/gdbuserror.c
Simon McVittie 510d0716be gdbus: Use symbolic constants for the most common D-Bus error names 
To avoid adding a large block of macros to gdbusprivate.h, I've only
added a subset of the well-known error names. I chose to draw the
line by adding constants for the errors emitted via their string names
in GDBusConnection, but not for error names that are only mentioned
in `gdbuserror.c` or in tests.

Signed-off-by: Simon McVittie <smcv@collabora.com>
2024-05-16 22:52:23 +01:00

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/* GDBus - GLib D-Bus Library
*
* Copyright (C) 2008-2010 Red Hat, Inc.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Author: David Zeuthen <davidz@redhat.com>
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include "gdbuserror.h"
#include "gioenums.h"
#include "gioenumtypes.h"
#include "gioerror.h"
#include "gdbusprivate.h"
#include "glibintl.h"
static const GDBusErrorEntry g_dbus_error_entries[] =
{
{G_DBUS_ERROR_FAILED, DBUS_ERROR_FAILED},
{G_DBUS_ERROR_NO_MEMORY, "org.freedesktop.DBus.Error.NoMemory"},
{G_DBUS_ERROR_SERVICE_UNKNOWN, "org.freedesktop.DBus.Error.ServiceUnknown"},
{G_DBUS_ERROR_NAME_HAS_NO_OWNER, DBUS_ERROR_NAME_HAS_NO_OWNER},
{G_DBUS_ERROR_NO_REPLY, "org.freedesktop.DBus.Error.NoReply"},
{G_DBUS_ERROR_IO_ERROR, "org.freedesktop.DBus.Error.IOError"},
{G_DBUS_ERROR_BAD_ADDRESS, "org.freedesktop.DBus.Error.BadAddress"},
{G_DBUS_ERROR_NOT_SUPPORTED, "org.freedesktop.DBus.Error.NotSupported"},
{G_DBUS_ERROR_LIMITS_EXCEEDED, "org.freedesktop.DBus.Error.LimitsExceeded"},
{G_DBUS_ERROR_ACCESS_DENIED, "org.freedesktop.DBus.Error.AccessDenied"},
{G_DBUS_ERROR_AUTH_FAILED, "org.freedesktop.DBus.Error.AuthFailed"},
{G_DBUS_ERROR_NO_SERVER, "org.freedesktop.DBus.Error.NoServer"},
{G_DBUS_ERROR_TIMEOUT, "org.freedesktop.DBus.Error.Timeout"},
{G_DBUS_ERROR_NO_NETWORK, "org.freedesktop.DBus.Error.NoNetwork"},
{G_DBUS_ERROR_ADDRESS_IN_USE, "org.freedesktop.DBus.Error.AddressInUse"},
{G_DBUS_ERROR_DISCONNECTED, "org.freedesktop.DBus.Error.Disconnected"},
{G_DBUS_ERROR_INVALID_ARGS, DBUS_ERROR_INVALID_ARGS},
{G_DBUS_ERROR_FILE_NOT_FOUND, "org.freedesktop.DBus.Error.FileNotFound"},
{G_DBUS_ERROR_FILE_EXISTS, "org.freedesktop.DBus.Error.FileExists"},
{G_DBUS_ERROR_UNKNOWN_METHOD, DBUS_ERROR_UNKNOWN_METHOD},
{G_DBUS_ERROR_TIMED_OUT, "org.freedesktop.DBus.Error.TimedOut"},
{G_DBUS_ERROR_MATCH_RULE_NOT_FOUND, "org.freedesktop.DBus.Error.MatchRuleNotFound"},
{G_DBUS_ERROR_MATCH_RULE_INVALID, "org.freedesktop.DBus.Error.MatchRuleInvalid"},
{G_DBUS_ERROR_SPAWN_EXEC_FAILED, "org.freedesktop.DBus.Error.Spawn.ExecFailed"},
{G_DBUS_ERROR_SPAWN_FORK_FAILED, "org.freedesktop.DBus.Error.Spawn.ForkFailed"},
{G_DBUS_ERROR_SPAWN_CHILD_EXITED, "org.freedesktop.DBus.Error.Spawn.ChildExited"},
{G_DBUS_ERROR_SPAWN_CHILD_SIGNALED, "org.freedesktop.DBus.Error.Spawn.ChildSignaled"},
{G_DBUS_ERROR_SPAWN_FAILED, "org.freedesktop.DBus.Error.Spawn.Failed"},
{G_DBUS_ERROR_SPAWN_SETUP_FAILED, "org.freedesktop.DBus.Error.Spawn.FailedToSetup"},
{G_DBUS_ERROR_SPAWN_CONFIG_INVALID, "org.freedesktop.DBus.Error.Spawn.ConfigInvalid"},
{G_DBUS_ERROR_SPAWN_SERVICE_INVALID, "org.freedesktop.DBus.Error.Spawn.ServiceNotValid"},
{G_DBUS_ERROR_SPAWN_SERVICE_NOT_FOUND, "org.freedesktop.DBus.Error.Spawn.ServiceNotFound"},
{G_DBUS_ERROR_SPAWN_PERMISSIONS_INVALID, "org.freedesktop.DBus.Error.Spawn.PermissionsInvalid"},
{G_DBUS_ERROR_SPAWN_FILE_INVALID, "org.freedesktop.DBus.Error.Spawn.FileInvalid"},
{G_DBUS_ERROR_SPAWN_NO_MEMORY, "org.freedesktop.DBus.Error.Spawn.NoMemory"},
{G_DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN, "org.freedesktop.DBus.Error.UnixProcessIdUnknown"},
{G_DBUS_ERROR_INVALID_SIGNATURE, "org.freedesktop.DBus.Error.InvalidSignature"},
{G_DBUS_ERROR_INVALID_FILE_CONTENT, "org.freedesktop.DBus.Error.InvalidFileContent"},
{G_DBUS_ERROR_SELINUX_SECURITY_CONTEXT_UNKNOWN, "org.freedesktop.DBus.Error.SELinuxSecurityContextUnknown"},
{G_DBUS_ERROR_ADT_AUDIT_DATA_UNKNOWN, "org.freedesktop.DBus.Error.AdtAuditDataUnknown"},
{G_DBUS_ERROR_OBJECT_PATH_IN_USE, "org.freedesktop.DBus.Error.ObjectPathInUse"},
{G_DBUS_ERROR_UNKNOWN_OBJECT, "org.freedesktop.DBus.Error.UnknownObject"},
{G_DBUS_ERROR_UNKNOWN_INTERFACE, "org.freedesktop.DBus.Error.UnknownInterface"},
{G_DBUS_ERROR_UNKNOWN_PROPERTY, "org.freedesktop.DBus.Error.UnknownProperty"},
{G_DBUS_ERROR_PROPERTY_READ_ONLY, "org.freedesktop.DBus.Error.PropertyReadOnly"},
};
GQuark
g_dbus_error_quark (void)
{
G_STATIC_ASSERT (G_N_ELEMENTS (g_dbus_error_entries) - 1 == G_DBUS_ERROR_PROPERTY_READ_ONLY);
static gsize quark = 0;
g_dbus_error_register_error_domain ("g-dbus-error-quark",
&quark,
g_dbus_error_entries,
G_N_ELEMENTS (g_dbus_error_entries));
return (GQuark) quark;
}
/**
* g_dbus_error_register_error_domain:
* @error_domain_quark_name: The error domain name.
* @quark_volatile: A pointer where to store the #GQuark.
* @entries: (array length=num_entries): A pointer to @num_entries #GDBusErrorEntry struct items.
* @num_entries: Number of items to register.
*
* Helper function for associating a #GError error domain with D-Bus error names.
*
* While @quark_volatile has a `volatile` qualifier, this is a historical
* artifact and the argument passed to it should not be `volatile`.
*
* Since: 2.26
*/
void
g_dbus_error_register_error_domain (const gchar *error_domain_quark_name,
volatile gsize *quark_volatile,
const GDBusErrorEntry *entries,
guint num_entries)
{
gsize *quark;
g_return_if_fail (error_domain_quark_name != NULL);
g_return_if_fail (quark_volatile != NULL);
g_return_if_fail (entries != NULL);
g_return_if_fail (num_entries > 0);
/* Drop the volatile qualifier, which should never have been on the argument
* in the first place. */
quark = (gsize *) quark_volatile;
if (g_once_init_enter (quark))
{
guint n;
GQuark new_quark;
new_quark = g_quark_from_static_string (error_domain_quark_name);
for (n = 0; n < num_entries; n++)
{
g_warn_if_fail (g_dbus_error_register_error (new_quark,
entries[n].error_code,
entries[n].dbus_error_name));
}
g_once_init_leave (quark, new_quark);
}
}
static gboolean
_g_dbus_error_decode_gerror (const gchar *dbus_name,
GQuark *out_error_domain,
gint *out_error_code)
{
gboolean ret;
guint n;
GString *s;
gchar *domain_quark_string;
ret = FALSE;
s = NULL;
if (g_str_has_prefix (dbus_name, "org.gtk.GDBus.UnmappedGError.Quark._"))
{
s = g_string_new (NULL);
for (n = sizeof "org.gtk.GDBus.UnmappedGError.Quark._" - 1;
dbus_name[n] != '.' && dbus_name[n] != '\0';
n++)
{
if (g_ascii_isalnum (dbus_name[n]))
{
g_string_append_c (s, dbus_name[n]);
}
else if (dbus_name[n] == '_')
{
guint nibble_top;
guint nibble_bottom;
n++;
nibble_top = dbus_name[n];
if (nibble_top >= '0' && nibble_top <= '9')
nibble_top -= '0';
else if (nibble_top >= 'a' && nibble_top <= 'f')
nibble_top -= ('a' - 10);
else
goto not_mapped;
n++;
nibble_bottom = dbus_name[n];
if (nibble_bottom >= '0' && nibble_bottom <= '9')
nibble_bottom -= '0';
else if (nibble_bottom >= 'a' && nibble_bottom <= 'f')
nibble_bottom -= ('a' - 10);
else
goto not_mapped;
g_string_append_c (s, (nibble_top<<4) | nibble_bottom);
}
else
{
goto not_mapped;
}
}
if (!g_str_has_prefix (dbus_name + n, ".Code"))
goto not_mapped;
domain_quark_string = g_string_free (s, FALSE);
s = NULL;
if (out_error_domain != NULL)
*out_error_domain = g_quark_from_string (domain_quark_string);
g_free (domain_quark_string);
if (out_error_code != NULL)
*out_error_code = atoi (dbus_name + n + sizeof ".Code" - 1);
ret = TRUE;
}
not_mapped:
if (s != NULL)
g_string_free (s, TRUE);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
GQuark error_domain;
gint error_code;
} QuarkCodePair;
static guint
quark_code_pair_hash_func (const QuarkCodePair *pair)
{
gint val;
val = pair->error_domain + pair->error_code;
return g_int_hash (&val);
}
static gboolean
quark_code_pair_equal_func (const QuarkCodePair *a,
const QuarkCodePair *b)
{
return (a->error_domain == b->error_domain) && (a->error_code == b->error_code);
}
typedef struct
{
QuarkCodePair pair;
gchar *dbus_error_name;
} RegisteredError;
static void
registered_error_free (RegisteredError *re)
{
g_free (re->dbus_error_name);
g_free (re);
}
G_LOCK_DEFINE_STATIC (error_lock);
/* maps from QuarkCodePair* -> RegisteredError* */
static GHashTable *quark_code_pair_to_re = NULL;
/* maps from gchar* -> RegisteredError* */
static GHashTable *dbus_error_name_to_re = NULL;
/**
* g_dbus_error_register_error:
* @error_domain: A #GQuark for an error domain.
* @error_code: An error code.
* @dbus_error_name: A D-Bus error name.
*
* Creates an association to map between @dbus_error_name and
* #GErrors specified by @error_domain and @error_code.
*
* This is typically done in the routine that returns the #GQuark for
* an error domain.
*
* Returns: %TRUE if the association was created, %FALSE if it already
* exists.
*
* Since: 2.26
*/
gboolean
g_dbus_error_register_error (GQuark error_domain,
gint error_code,
const gchar *dbus_error_name)
{
gboolean ret;
QuarkCodePair pair;
RegisteredError *re;
g_return_val_if_fail (dbus_error_name != NULL, FALSE);
ret = FALSE;
G_LOCK (error_lock);
if (quark_code_pair_to_re == NULL)
{
g_assert (dbus_error_name_to_re == NULL); /* check invariant */
quark_code_pair_to_re = g_hash_table_new ((GHashFunc) quark_code_pair_hash_func,
(GEqualFunc) quark_code_pair_equal_func);
dbus_error_name_to_re = g_hash_table_new_full (g_str_hash,
g_str_equal,
NULL,
(GDestroyNotify) registered_error_free);
}
if (g_hash_table_lookup (dbus_error_name_to_re, dbus_error_name) != NULL)
goto out;
pair.error_domain = error_domain;
pair.error_code = error_code;
if (g_hash_table_lookup (quark_code_pair_to_re, &pair) != NULL)
goto out;
re = g_new0 (RegisteredError, 1);
re->pair = pair;
re->dbus_error_name = g_strdup (dbus_error_name);
g_hash_table_insert (quark_code_pair_to_re, &(re->pair), re);
g_hash_table_insert (dbus_error_name_to_re, re->dbus_error_name, re);
ret = TRUE;
out:
G_UNLOCK (error_lock);
return ret;
}
/**
* g_dbus_error_unregister_error:
* @error_domain: A #GQuark for an error domain.
* @error_code: An error code.
* @dbus_error_name: A D-Bus error name.
*
* Destroys an association previously set up with g_dbus_error_register_error().
*
* Returns: %TRUE if the association was destroyed, %FALSE if it wasn't found.
*
* Since: 2.26
*/
gboolean
g_dbus_error_unregister_error (GQuark error_domain,
gint error_code,
const gchar *dbus_error_name)
{
gboolean ret;
RegisteredError *re;
guint hash_size;
g_return_val_if_fail (dbus_error_name != NULL, FALSE);
ret = FALSE;
G_LOCK (error_lock);
if (dbus_error_name_to_re == NULL)
{
g_assert (quark_code_pair_to_re == NULL); /* check invariant */
goto out;
}
re = g_hash_table_lookup (dbus_error_name_to_re, dbus_error_name);
if (re == NULL)
{
QuarkCodePair pair;
pair.error_domain = error_domain;
pair.error_code = error_code;
g_warn_if_fail (g_hash_table_lookup (quark_code_pair_to_re, &pair) == NULL); /* check invariant */
goto out;
}
ret = TRUE;
g_warn_if_fail (g_hash_table_lookup (quark_code_pair_to_re, &(re->pair)) == re); /* check invariant */
g_warn_if_fail (g_hash_table_remove (quark_code_pair_to_re, &(re->pair)));
g_warn_if_fail (g_hash_table_remove (dbus_error_name_to_re, re->dbus_error_name));
/* destroy hashes if empty */
hash_size = g_hash_table_size (dbus_error_name_to_re);
if (hash_size == 0)
{
g_warn_if_fail (g_hash_table_size (quark_code_pair_to_re) == 0); /* check invariant */
g_hash_table_unref (dbus_error_name_to_re);
dbus_error_name_to_re = NULL;
g_hash_table_unref (quark_code_pair_to_re);
quark_code_pair_to_re = NULL;
}
else
{
g_warn_if_fail (g_hash_table_size (quark_code_pair_to_re) == hash_size); /* check invariant */
}
out:
G_UNLOCK (error_lock);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_error_is_remote_error:
* @error: A #GError.
*
* Checks if @error represents an error received via D-Bus from a remote peer. If so,
* use g_dbus_error_get_remote_error() to get the name of the error.
*
* Returns: %TRUE if @error represents an error from a remote peer,
* %FALSE otherwise.
*
* Since: 2.26
*/
gboolean
g_dbus_error_is_remote_error (const GError *error)
{
g_return_val_if_fail (error != NULL, FALSE);
return g_str_has_prefix (error->message, "GDBus.Error:");
}
/**
* g_dbus_error_get_remote_error:
* @error: a #GError
*
* Gets the D-Bus error name used for @error, if any.
*
* This function is guaranteed to return a D-Bus error name for all
* #GErrors returned from functions handling remote method calls
* (e.g. g_dbus_connection_call_finish()) unless
* g_dbus_error_strip_remote_error() has been used on @error.
*
* Returns: (nullable) (transfer full): an allocated string or %NULL if the
* D-Bus error name could not be found. Free with g_free().
*
* Since: 2.26
*/
gchar *
g_dbus_error_get_remote_error (const GError *error)
{
RegisteredError *re;
gchar *ret;
g_return_val_if_fail (error != NULL, NULL);
/* Ensure that e.g. G_DBUS_ERROR is registered using g_dbus_error_register_error() */
_g_dbus_initialize ();
ret = NULL;
G_LOCK (error_lock);
re = NULL;
if (quark_code_pair_to_re != NULL)
{
QuarkCodePair pair;
pair.error_domain = error->domain;
pair.error_code = error->code;
g_assert (dbus_error_name_to_re != NULL); /* check invariant */
re = g_hash_table_lookup (quark_code_pair_to_re, &pair);
}
if (re != NULL)
{
ret = g_strdup (re->dbus_error_name);
}
else
{
if (g_str_has_prefix (error->message, "GDBus.Error:"))
{
const gchar *begin;
const gchar *end;
begin = error->message + sizeof ("GDBus.Error:") -1;
end = strstr (begin, ":");
if (end != NULL && end[1] == ' ')
{
ret = g_strndup (begin, end - begin);
}
}
}
G_UNLOCK (error_lock);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_error_new_for_dbus_error:
* @dbus_error_name: D-Bus error name.
* @dbus_error_message: D-Bus error message.
*
* Creates a #GError based on the contents of @dbus_error_name and
* @dbus_error_message.
*
* Errors registered with g_dbus_error_register_error() will be looked
* up using @dbus_error_name and if a match is found, the error domain
* and code is used. Applications can use g_dbus_error_get_remote_error()
* to recover @dbus_error_name.
*
* If a match against a registered error is not found and the D-Bus
* error name is in a form as returned by g_dbus_error_encode_gerror()
* the error domain and code encoded in the name is used to
* create the #GError. Also, @dbus_error_name is added to the error message
* such that it can be recovered with g_dbus_error_get_remote_error().
*
* Otherwise, a #GError with the error code %G_IO_ERROR_DBUS_ERROR
* in the %G_IO_ERROR error domain is returned. Also, @dbus_error_name is
* added to the error message such that it can be recovered with
* g_dbus_error_get_remote_error().
*
* In all three cases, @dbus_error_name can always be recovered from the
* returned #GError using the g_dbus_error_get_remote_error() function
* (unless g_dbus_error_strip_remote_error() hasn't been used on the returned error).
*
* This function is typically only used in object mappings to prepare
* #GError instances for applications. Regular applications should not use
* it.
*
* Returns: (transfer full): An allocated #GError. Free with g_error_free().
*
* Since: 2.26
*/
GError *
g_dbus_error_new_for_dbus_error (const gchar *dbus_error_name,
const gchar *dbus_error_message)
{
GError *error;
RegisteredError *re;
g_return_val_if_fail (dbus_error_name != NULL, NULL);
g_return_val_if_fail (dbus_error_message != NULL, NULL);
/* Ensure that e.g. G_DBUS_ERROR is registered using g_dbus_error_register_error() */
_g_dbus_initialize ();
G_LOCK (error_lock);
re = NULL;
if (dbus_error_name_to_re != NULL)
{
g_assert (quark_code_pair_to_re != NULL); /* check invariant */
re = g_hash_table_lookup (dbus_error_name_to_re, dbus_error_name);
}
if (re != NULL)
{
error = g_error_new (re->pair.error_domain,
re->pair.error_code,
"GDBus.Error:%s: %s",
dbus_error_name,
dbus_error_message);
}
else
{
GQuark error_domain = 0;
gint error_code = 0;
if (_g_dbus_error_decode_gerror (dbus_error_name,
&error_domain,
&error_code))
{
error = g_error_new (error_domain,
error_code,
"GDBus.Error:%s: %s",
dbus_error_name,
dbus_error_message);
}
else
{
error = g_error_new (G_IO_ERROR,
G_IO_ERROR_DBUS_ERROR,
"GDBus.Error:%s: %s",
dbus_error_name,
dbus_error_message);
}
}
G_UNLOCK (error_lock);
return error;
}
/**
* g_dbus_error_set_dbus_error:
* @error: A pointer to a #GError or %NULL.
* @dbus_error_name: D-Bus error name.
* @dbus_error_message: D-Bus error message.
* @format: (nullable): printf()-style format to prepend to @dbus_error_message or %NULL.
* @...: Arguments for @format.
*
* Does nothing if @error is %NULL. Otherwise sets *@error to
* a new #GError created with g_dbus_error_new_for_dbus_error()
* with @dbus_error_message prepend with @format (unless %NULL).
*
* Since: 2.26
*/
void
g_dbus_error_set_dbus_error (GError **error,
const gchar *dbus_error_name,
const gchar *dbus_error_message,
const gchar *format,
...)
{
g_return_if_fail (error == NULL || *error == NULL);
g_return_if_fail (dbus_error_name != NULL);
g_return_if_fail (dbus_error_message != NULL);
if (error == NULL)
return;
if (format == NULL)
{
*error = g_dbus_error_new_for_dbus_error (dbus_error_name, dbus_error_message);
}
else
{
va_list var_args;
va_start (var_args, format);
g_dbus_error_set_dbus_error_valist (error,
dbus_error_name,
dbus_error_message,
format,
var_args);
va_end (var_args);
}
}
/**
* g_dbus_error_set_dbus_error_valist:
* @error: A pointer to a #GError or %NULL.
* @dbus_error_name: D-Bus error name.
* @dbus_error_message: D-Bus error message.
* @format: (nullable): printf()-style format to prepend to @dbus_error_message or %NULL.
* @var_args: Arguments for @format.
*
* Like g_dbus_error_set_dbus_error() but intended for language bindings.
*
* Since: 2.26
*/
void
g_dbus_error_set_dbus_error_valist (GError **error,
const gchar *dbus_error_name,
const gchar *dbus_error_message,
const gchar *format,
va_list var_args)
{
g_return_if_fail (error == NULL || *error == NULL);
g_return_if_fail (dbus_error_name != NULL);
g_return_if_fail (dbus_error_message != NULL);
if (error == NULL)
return;
if (format != NULL)
{
gchar *message;
gchar *s;
message = g_strdup_vprintf (format, var_args);
s = g_strdup_printf ("%s: %s", message, dbus_error_message);
*error = g_dbus_error_new_for_dbus_error (dbus_error_name, s);
g_free (s);
g_free (message);
}
else
{
*error = g_dbus_error_new_for_dbus_error (dbus_error_name, dbus_error_message);
}
}
/**
* g_dbus_error_strip_remote_error:
* @error: A #GError.
*
* Looks for extra information in the error message used to recover
* the D-Bus error name and strips it if found. If stripped, the
* message field in @error will correspond exactly to what was
* received on the wire.
*
* This is typically used when presenting errors to the end user.
*
* Returns: %TRUE if information was stripped, %FALSE otherwise.
*
* Since: 2.26
*/
gboolean
g_dbus_error_strip_remote_error (GError *error)
{
gboolean ret;
g_return_val_if_fail (error != NULL, FALSE);
ret = FALSE;
if (g_str_has_prefix (error->message, "GDBus.Error:"))
{
const gchar *begin;
const gchar *end;
gchar *new_message;
begin = error->message + sizeof ("GDBus.Error:") -1;
end = strstr (begin, ":");
if (end != NULL && end[1] == ' ')
{
new_message = g_strdup (end + 2);
g_free (error->message);
error->message = new_message;
ret = TRUE;
}
}
return ret;
}
/**
* g_dbus_error_encode_gerror:
* @error: A #GError.
*
* Creates a D-Bus error name to use for @error. If @error matches
* a registered error (cf. g_dbus_error_register_error()), the corresponding
* D-Bus error name will be returned.
*
* Otherwise the a name of the form
* `org.gtk.GDBus.UnmappedGError.Quark._ESCAPED_QUARK_NAME.Code_ERROR_CODE`
* will be used. This allows other GDBus applications to map the error
* on the wire back to a #GError using g_dbus_error_new_for_dbus_error().
*
* This function is typically only used in object mappings to put a
* #GError on the wire. Regular applications should not use it.
*
* Returns: (transfer full) (not nullable): A D-Bus error name (never %NULL).
* Free with g_free().
*
* Since: 2.26
*/
gchar *
g_dbus_error_encode_gerror (const GError *error)
{
RegisteredError *re;
gchar *error_name;
g_return_val_if_fail (error != NULL, NULL);
/* Ensure that e.g. G_DBUS_ERROR is registered using g_dbus_error_register_error() */
_g_dbus_initialize ();
error_name = NULL;
G_LOCK (error_lock);
re = NULL;
if (quark_code_pair_to_re != NULL)
{
QuarkCodePair pair;
pair.error_domain = error->domain;
pair.error_code = error->code;
g_assert (dbus_error_name_to_re != NULL); /* check invariant */
re = g_hash_table_lookup (quark_code_pair_to_re, &pair);
}
if (re != NULL)
{
error_name = g_strdup (re->dbus_error_name);
G_UNLOCK (error_lock);
}
else
{
const gchar *domain_as_string;
GString *s;
guint n;
G_UNLOCK (error_lock);
/* We can't make a lot of assumptions about what domain_as_string
* looks like and D-Bus is extremely picky about error names so
* hex-encode it for transport across the wire.
*/
domain_as_string = g_quark_to_string (error->domain);
/* 0 is not a domain; neither are non-quark integers */
g_return_val_if_fail (domain_as_string != NULL, NULL);
s = g_string_new ("org.gtk.GDBus.UnmappedGError.Quark._");
for (n = 0; domain_as_string[n] != 0; n++)
{
gint c = domain_as_string[n];
if (g_ascii_isalnum (c))
{
g_string_append_c (s, c);
}
else
{
guint nibble_top;
guint nibble_bottom;
g_string_append_c (s, '_');
nibble_top = ((int) domain_as_string[n]) >> 4;
nibble_bottom = ((int) domain_as_string[n]) & 0x0f;
if (nibble_top < 10)
nibble_top += '0';
else
nibble_top += 'a' - 10;
if (nibble_bottom < 10)
nibble_bottom += '0';
else
nibble_bottom += 'a' - 10;
g_string_append_c (s, nibble_top);
g_string_append_c (s, nibble_bottom);
}
}
g_string_append_printf (s, ".Code%d", error->code);
error_name = g_string_free (s, FALSE);
}
return error_name;
}
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