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gobject: Add g_{param_spec,signal}_is_valid_name() functions

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Making this validation code public allows projects to validate a
GParamSpec name before creating it. While hard-coded GParamSpec don't
need this, we can't afford crashing the main program for dynamically
generated GParamSpec from user-created data.

In such case, we will need to validate the param names and return errors
instead of trying to create a GParamSpec with invalid names.

Includes modifications from Philip Withnall and Emmanuele Bassi to
rearrange the new function addition and split it into one function for
GParamSpecs and one for GSignals.
This commit is contained in:
Jehan 2019-12-23 18:36:21 +01:00 committed by Philip Withnall
parent fb1e416a32
commit 13d1697b67
7 changed files with 104 additions and 33 deletions
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2
docs/reference/gobject/gobject-sections.txt
View File

@ -521,6 +521,7 @@ g_param_value_defaults
g_param_value_validate
g_param_value_convert
g_param_values_cmp
g_param_spec_is_valid_name
g_param_spec_get_name
g_param_spec_get_name_quark
g_param_spec_get_nick
@ -859,6 +860,7 @@ g_signal_override_class_handler
g_signal_chain_from_overridden_handler
g_signal_add_emission_hook
g_signal_remove_emission_hook
g_signal_is_valid_name
g_signal_parse_name
g_signal_get_invocation_hint
g_signal_type_cclosure_new

28
gobject/gparam.c
View File

@ -381,20 +381,34 @@ is_canonical (const gchar *key)
return (strchr (key, '_') == NULL);
}
static gboolean
is_valid_property_name (const gchar *key)
/**
* g_param_spec_is_valid_name:
* @name: the canonical name of the property
*
* Validate a property name for a #GParamSpec. This can be useful for
* dynamically-generated properties which need to be validated at run-time
* before actually trying to create them.
*
* See [canonical parameter names][canonical-parameter-names] for details of
* the rules for valid names.
*
* Returns: %TRUE if @name is a valid property name, %FALSE otherwise.
* Since: 2.66
*/
gboolean
g_param_spec_is_valid_name (const gchar *name)
{
const gchar *p;
/* First character must be a letter. */
if ((key[0] < 'A' || key[0] > 'Z') &&
(key[0] < 'a' || key[0] > 'z'))
if ((name[0] < 'A' || name[0] > 'Z') &&
(name[0] < 'a' || name[0] > 'z'))
return FALSE;
for (p = key; *p != 0; p++)
for (p = name; *p != 0; p++)
{
const gchar c = *p;
if (c != '-' && c != '_' &&
(c < '0' || c > '9') &&
(c < 'A' || c > 'Z') &&
@ -439,7 +453,7 @@ g_param_spec_internal (GType param_type,
g_return_val_if_fail (G_TYPE_IS_PARAM (param_type) && param_type != G_TYPE_PARAM, NULL);
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (is_valid_property_name (name), NULL);
g_return_val_if_fail (g_param_spec_is_valid_name (name), NULL);
g_return_val_if_fail (!(flags & G_PARAM_STATIC_NAME) || is_canonical (name), NULL);
pspec = (gpointer) g_type_create_instance (param_type);

3
gobject/gparam.h
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@ -395,6 +395,9 @@ GLIB_AVAILABLE_IN_ALL
GType g_param_type_register_static (const gchar *name,
const GParamSpecTypeInfo *pspec_info);
GLIB_AVAILABLE_IN_2_66
gboolean g_param_spec_is_valid_name (const gchar *name);
/* For registering builting types */
GType _g_param_type_register_static_constant (const gchar *name,
const GParamSpecTypeInfo *pspec_info,

44
gobject/gsignal.c
View File

@ -367,33 +367,29 @@ is_canonical (const gchar *key)
return (strchr (key, '_') == NULL);
}
static gboolean
is_valid_signal_name (const gchar *key)
/**
* g_signal_is_valid_name:
* @name: the canonical name of the signal
*
* Validate a signal name. This can be useful for dynamically-generated signals
* which need to be validated at run-time before actually trying to create them.
*
* See [canonical parameter names][canonical-parameter-names] for details of
* the rules for valid names. The rules for signal names are the same as those
* for property names.
*
* Returns: %TRUE if @name is a valid signal name, %FALSE otherwise.
* Since: 2.66
*/
gboolean
g_signal_is_valid_name (const gchar *name)
{
const gchar *p;
/* FIXME: We allow this, against our own documentation (the leading `-` is
* invalid), because GTK has historically used this. */
if (g_str_equal (key, "-gtk-private-changed"))
if (g_str_equal (name, "-gtk-private-changed"))
return TRUE;
/* First character must be a letter. */
if ((key[0] < 'A' || key[0] > 'Z') &&
(key[0] < 'a' || key[0] > 'z'))
return FALSE;
for (p = key; *p != 0; p++)
{
const gchar c = *p;
if (c != '-' && c != '_' &&
(c < '0' || c > '9') &&
(c < 'A' || c > 'Z') &&
(c < 'a' || c > 'z'))
return FALSE;
}
return TRUE;
return g_param_spec_is_valid_name (name);
}
static inline guint
@ -1325,7 +1321,7 @@ g_signal_lookup (const gchar *name,
if (!g_type_name (itype))
g_warning (G_STRLOC ": unable to look up signal \"%s\" for invalid type id '%"G_GSIZE_FORMAT"'",
name, itype);
else if (!is_valid_signal_name (name))
else if (!g_signal_is_valid_name (name))
g_warning (G_STRLOC ": unable to look up invalid signal name \"%s\" on type '%s'",
name, g_type_name (itype));
}
@ -1712,7 +1708,7 @@ g_signal_newv (const gchar *signal_name,
GSignalCVaMarshaller va_marshaller;
g_return_val_if_fail (signal_name != NULL, 0);
g_return_val_if_fail (is_valid_signal_name (signal_name), 0);
g_return_val_if_fail (g_signal_is_valid_name (signal_name), 0);
g_return_val_if_fail (G_TYPE_IS_INSTANTIATABLE (itype) || G_TYPE_IS_INTERFACE (itype), 0);
if (n_params)
g_return_val_if_fail (param_types != NULL, 0);

2
gobject/gsignal.h
View File

@ -338,6 +338,8 @@ void g_signal_query (guint signal_id,
GLIB_AVAILABLE_IN_ALL
guint* g_signal_list_ids (GType itype,
guint *n_ids);
GLIB_AVAILABLE_IN_2_66
gboolean g_signal_is_valid_name (const gchar *name);
GLIB_AVAILABLE_IN_ALL
gboolean g_signal_parse_name (const gchar *detailed_signal,
GType itype,

29
gobject/tests/param.c
View File

@ -126,7 +126,7 @@ test_param_invalid_name (gconstpointer test_data)
g_test_trap_subprocess (NULL, 0, 0);
g_test_trap_assert_failed ();
g_test_trap_assert_stderr ("*CRITICAL*is_valid_property_name (name)*");
g_test_trap_assert_stderr ("*CRITICAL*g_param_spec_is_valid_name (name)*");
}
static void
@ -846,6 +846,32 @@ test_param_default (void)
g_param_spec_unref (param);
}
static void
test_param_is_valid_name (void)
{
const gchar *valid_names[] =
{
"property",
"i",
"multiple-segments",
"segment0-SEGMENT1",
"using_underscores",
};
const gchar *invalid_names[] =
{
"",
"7zip",
"my_int:hello",
};
gsize i;
for (i = 0; i < G_N_ELEMENTS (valid_names); i++)
g_assert_true (g_param_spec_is_valid_name (valid_names[i]));
for (i = 0; i < G_N_ELEMENTS (invalid_names); i++)
g_assert_false (g_param_spec_is_valid_name (invalid_names[i]));
}
int
main (int argc, char *argv[])
{
@ -881,6 +907,7 @@ main (int argc, char *argv[])
g_test_add_func ("/value/transform", test_value_transform);
g_test_add_func ("/param/default", test_param_default);
g_test_add_func ("/param/is-valid-name", test_param_is_valid_name);
return g_test_run ();
}

29
gobject/tests/signals.c
View File

@ -1449,7 +1449,33 @@ test_signals_invalid_name (gconstpointer test_data)
g_test_trap_subprocess (NULL, 0, 0);
g_test_trap_assert_failed ();
g_test_trap_assert_stderr ("*CRITICAL*is_valid_signal_name (signal_name)*");
g_test_trap_assert_stderr ("*CRITICAL*g_signal_is_valid_name (signal_name)*");
}
static void
test_signal_is_valid_name (void)
{
const gchar *valid_names[] =
{
"signal",
"i",
"multiple-segments",
"segment0-SEGMENT1",
"using_underscores",
};
const gchar *invalid_names[] =
{
"",
"7zip",
"my_int:hello",
};
gsize i;
for (i = 0; i < G_N_ELEMENTS (valid_names); i++)
g_assert_true (g_signal_is_valid_name (valid_names[i]));
for (i = 0; i < G_N_ELEMENTS (invalid_names); i++)
g_assert_false (g_signal_is_valid_name (invalid_names[i]));
}
/* --- */
@ -1485,6 +1511,7 @@ main (int argc,
g_test_add_data_func ("/gobject/signals/invalid-name/colon", "my_int:hello", test_signals_invalid_name);
g_test_add_data_func ("/gobject/signals/invalid-name/first-char", "7zip", test_signals_invalid_name);
g_test_add_data_func ("/gobject/signals/invalid-name/empty", "", test_signals_invalid_name);
g_test_add_func ("/gobject/signals/is-valid-name", test_signal_is_valid_name);
return g_test_run ();
}