Add new cdio_drivers and cdio_device_drivers arrays.

include/cdio/device.h

@@ -171,6 +171,15 @@ extern "C" {
     DRIVER_DEVICE   /**< Is really a set of the above; should come last */
   } driver_id_t;
 
+  /** A null-terminated (that is DRIVER_UNKNOWN-terminated) ordered (in
+     order of preference) array of drivers.
+  */
+  extern const driver_id_t cdio_drivers[];
+  /** A null-terminated (that is DRIVER_UNKNOWN-terminated) ordered (in
+     order of preference) array of device drivers.
+  */
+  extern const driver_id_t cdio_device_drivers[];
+
   /** There will generally be only one hardware for a given
      build/platform from the list above. You can use the variable
      below to determine which you've got. If the build doesn't make an

lib/driver/device.c

@@ -270,6 +270,35 @@ CdIo_driver_t CdIo_all_drivers[CDIO_MAX_DRIVER+1] = {
 
 };
 
+const driver_id_t cdio_drivers[] = {
+  DRIVER_AIX,
+  DRIVER_BSDI,
+  DRIVER_FREEBSD,
+  DRIVER_NETBSD,
+  DRIVER_LINUX,
+  DRIVER_SOLARIS,
+  DRIVER_OS2,
+  DRIVER_OSX,
+  DRIVER_WIN32,
+  DRIVER_CDRDAO,
+  DRIVER_BINCUE,
+  DRIVER_NRG,
+  DRIVER_UNKNOWN
+};
+
+const driver_id_t cdio_device_drivers[] = {
+  DRIVER_AIX,
+  DRIVER_BSDI,
+  DRIVER_FREEBSD,
+  DRIVER_NETBSD,
+  DRIVER_LINUX,
+  DRIVER_SOLARIS,
+  DRIVER_OS2,
+  DRIVER_OSX,
+  DRIVER_WIN32,
+  DRIVER_UNKNOWN
+};
+
 const char *
 cdio_driver_errmsg(driver_return_code_t drc)
 {