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glib/gio/gdbuserror.c
Christian Hergert 18a33f72db introspection: use (nullable) or (optional) instead of (allow-none) 
If we have an input parameter (or return value) we need to use (nullable).
However, if it is an (inout) or (out) parameter, (optional) is sufficient.

It looks like (nullable) could be used for everything according to the
Annotation documentation, but (optional) is more specific.
2016-11-22 14:14:37 -08:00

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/* GDBus - GLib D-Bus Library
*
* Copyright (C) 2008-2010 Red Hat, Inc.
*
* 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 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"
/**
* SECTION:gdbuserror
* @title: GDBusError
* @short_description: Mapping D-Bus errors to and from GError
* @include: gio/gio.h
*
* All facilities that return errors from remote methods (such as
* g_dbus_connection_call_sync()) use #GError to represent both D-Bus
* errors (e.g. errors returned from the other peer) and locally
* in-process generated errors.
*
* To check if a returned #GError is an error from a remote peer, use
* g_dbus_error_is_remote_error(). To get the actual D-Bus error name,
* use g_dbus_error_get_remote_error(). Before presenting an error,
* always use g_dbus_error_strip_remote_error().
*
* In addition, facilities used to return errors to a remote peer also
* use #GError. See g_dbus_method_invocation_return_error() for
* discussion about how the D-Bus error name is set.
*
* Applications can associate a #GError error domain with a set of D-Bus errors in order to
* automatically map from D-Bus errors to #GError and back. This
* is typically done in the function returning the #GQuark for the
* error domain:
* |[<!-- language="C" -->
* // foo-bar-error.h:
*
* #define FOO_BAR_ERROR (foo_bar_error_quark ())
* GQuark foo_bar_error_quark (void);
*
* typedef enum
* {
* FOO_BAR_ERROR_FAILED,
* FOO_BAR_ERROR_ANOTHER_ERROR,
* FOO_BAR_ERROR_SOME_THIRD_ERROR,
* FOO_BAR_N_ERRORS / *< skip >* /
* } FooBarError;
*
* // foo-bar-error.c:
*
* static const GDBusErrorEntry foo_bar_error_entries[] =
* {
* {FOO_BAR_ERROR_FAILED, "org.project.Foo.Bar.Error.Failed"},
* {FOO_BAR_ERROR_ANOTHER_ERROR, "org.project.Foo.Bar.Error.AnotherError"},
* {FOO_BAR_ERROR_SOME_THIRD_ERROR, "org.project.Foo.Bar.Error.SomeThirdError"},
* };
*
* // Ensure that every error code has an associated D-Bus error name
* G_STATIC_ASSERT (G_N_ELEMENTS (foo_bar_error_entries) == FOO_BAR_N_ERRORS);
*
* GQuark
* foo_bar_error_quark (void)
* {
* static volatile gsize quark_volatile = 0;
* g_dbus_error_register_error_domain ("foo-bar-error-quark",
* &quark_volatile,
* foo_bar_error_entries,
* G_N_ELEMENTS (foo_bar_error_entries));
* return (GQuark) quark_volatile;
* }
* ]|
* With this setup, a D-Bus peer can transparently pass e.g. %FOO_BAR_ERROR_ANOTHER_ERROR and
* other peers will see the D-Bus error name org.project.Foo.Bar.Error.AnotherError.
*
* If the other peer is using GDBus, and has registered the association with
* g_dbus_error_register_error_domain() in advance (e.g. by invoking the %FOO_BAR_ERROR quark
* generation itself in the previous example) the peer will see also %FOO_BAR_ERROR_ANOTHER_ERROR instead
* of %G_IO_ERROR_DBUS_ERROR. Note that GDBus clients can still recover
* org.project.Foo.Bar.Error.AnotherError using g_dbus_error_get_remote_error().
*
* Note that errors in the %G_DBUS_ERROR error domain is intended only
* for returning errors from a remote message bus process. Errors
* generated locally in-process by e.g. #GDBusConnection is from the
* %G_IO_ERROR domain.
*/
static const GDBusErrorEntry g_dbus_error_entries[] =
{
{G_DBUS_ERROR_FAILED, "org.freedesktop.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, "org.freedesktop.DBus.Error.NameHasNoOwner"},
{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, "org.freedesktop.DBus.Error.InvalidArgs"},
{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, "org.freedesktop.DBus.Error.UnknownMethod"},
{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 volatile gsize quark_volatile = 0;
g_dbus_error_register_error_domain ("g-dbus-error-quark",
&quark_volatile,
g_dbus_error_entries,
G_N_ELEMENTS (g_dbus_error_entries));
return (GQuark) quark_volatile;
}
/**
* g_dbus_error_register_error_domain:
* @error_domain_quark_name: The error domain name.
* @quark_volatile: A pointer where to store the #GQuark.
* @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.
*
* 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)
{
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);
if (g_once_init_enter (quark_volatile))
{
guint n;
GQuark quark;
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 (quark,
entries[n].error_code,
entries[n].dbus_error_name));
}
g_once_init_leave (quark_volatile, 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 a 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 a 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: 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: 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: 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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