kernel-device: ID_USB_INTERFACE_NUM should be read as an hex string

The original g_udev_device_get_property_as_int() uses strtol() without
an explicit base (i.e. 0) so that the base is autodetected from the
string whenever possible (e.g. if prefixes with '0x' it is treated as a
hexadecimal string).

But, for ID_USB_INTERFACE_NUM, we explicitly require reading the number
as an hex string, even if we don't have any '0x' prefix.

Reported-by: Matthew Stanger <stangerm2@gmail.com>

src/kerneldevice/mm-kernel-device-generic.c

@@ -873,6 +873,19 @@ kernel_device_get_property_as_int (MMKernelDevice *self,
     return ((value && mm_get_int_from_str (value, &aux)) ? aux : 0);
 }
 
+static guint
+kernel_device_get_property_as_int_hex (MMKernelDevice *self,
+                                       const gchar    *property)
+{
+    const gchar *value;
+    guint aux = 0;
+
+    g_return_val_if_fail (MM_IS_KERNEL_DEVICE_GENERIC (self), -1);
+
+    value = g_object_get_data (G_OBJECT (self), property);
+    return ((value && mm_get_uint_from_hex_str (value, &aux)) ? aux : 0);
+}
+
 /*****************************************************************************/
 
 MMKernelDevice *
@@ -1051,6 +1064,7 @@ mm_kernel_device_generic_class_init (MMKernelDeviceGenericClass *klass)
     kernel_device_class->get_property            = kernel_device_get_property;
     kernel_device_class->get_property_as_boolean = kernel_device_get_property_as_boolean;
     kernel_device_class->get_property_as_int     = kernel_device_get_property_as_int;
+    kernel_device_class->get_property_as_int_hex = kernel_device_get_property_as_int_hex;
 
     properties[PROP_PROPERTIES] =
         g_param_spec_object ("properties",

src/kerneldevice/mm-kernel-device-udev.c

@@ -579,6 +579,25 @@ kernel_device_get_property_as_int (MMKernelDevice *_self,
     return g_udev_device_get_property_as_int (self->priv->device, property);
 }
 
+static guint
+kernel_device_get_property_as_int_hex (MMKernelDevice *_self,
+                                       const gchar    *property)
+{
+    MMKernelDeviceUdev *self;
+    const gchar        *s;
+    guint               out = 0;
+
+    g_return_val_if_fail (MM_IS_KERNEL_DEVICE_UDEV (_self), -1);
+
+    self = MM_KERNEL_DEVICE_UDEV (_self);
+
+    if (!self->priv->device)
+        return -1;
+
+    s = g_udev_device_get_property (self->priv->device, property);
+    return ((s && mm_get_uint_from_hex_str (s, &out)) ? out : 0);
+}
+
 /*****************************************************************************/
 
 MMKernelDevice *
@@ -767,6 +786,7 @@ mm_kernel_device_udev_class_init (MMKernelDeviceUdevClass *klass)
     kernel_device_class->get_property            = kernel_device_get_property;
     kernel_device_class->get_property_as_boolean = kernel_device_get_property_as_boolean;
     kernel_device_class->get_property_as_int     = kernel_device_get_property_as_int;
+    kernel_device_class->get_property_as_int_hex = kernel_device_get_property_as_int_hex;
 
     properties[PROP_UDEV_DEVICE] =
         g_param_spec_object ("udev-device",

src/kerneldevice/mm-kernel-device.c

@@ -166,6 +166,17 @@ mm_kernel_device_get_property_as_int (MMKernelDevice *self,
             -1);
 }
 
+guint
+mm_kernel_device_get_property_as_int_hex (MMKernelDevice *self,
+                                          const gchar    *property)
+{
+    g_return_val_if_fail (MM_IS_KERNEL_DEVICE (self), 0);
+
+    return (MM_KERNEL_DEVICE_GET_CLASS (self)->get_property_as_int_hex ?
+            MM_KERNEL_DEVICE_GET_CLASS (self)->get_property_as_int_hex (self, property) :
+            0);
+}
+
 /*****************************************************************************/
 
 static void

src/kerneldevice/mm-kernel-device.h

@@ -61,6 +61,7 @@ struct _MMKernelDeviceClass {
     const gchar * (* get_property)            (MMKernelDevice *self, const gchar *property);
     gboolean      (* get_property_as_boolean) (MMKernelDevice *self, const gchar *property);
     gint          (* get_property_as_int)     (MMKernelDevice *self, const gchar *property);
+    guint         (* get_property_as_int_hex) (MMKernelDevice *self, const gchar *property);
 };
 
 GType mm_kernel_device_get_type (void);
@@ -85,5 +86,6 @@ gboolean     mm_kernel_device_has_property            (MMKernelDevice *self, con
 const gchar *mm_kernel_device_get_property            (MMKernelDevice *self, const gchar *property);
 gboolean     mm_kernel_device_get_property_as_boolean (MMKernelDevice *self, const gchar *property);
 gint         mm_kernel_device_get_property_as_int     (MMKernelDevice *self, const gchar *property);
+guint        mm_kernel_device_get_property_as_int_hex (MMKernelDevice *self, const gchar *property);
 
 #endif /* MM_KERNEL_DEVICE_H */