Function libusb_get_string_descriptor

lib/hidapi/libusb/hid.c:340–349

The libusb version included in FreeBSD < 10 doesn't have this function. In mainline libusb, it's inlined in libusb.h. This function will bear a striking resemblance to that one, because there's about one way to code it. Note that the data parameter is Unicode in UTF-16LE encoding. Return value is the number of bytes in data, or LIBUSB_ERROR_*. */

   Return value is the number of bytes in data, or LIBUSB_ERROR_*.
 */
static inline int libusb_get_string_descriptor(libusb_device_handle *dev,
	uint8_t descriptor_index, uint16_t lang_id,
	unsigned char *data, int length)
{
	return libusb_control_transfer(dev,
		LIBUSB_ENDPOINT_IN | 0x0, /* Endpoint 0 IN */
		LIBUSB_REQUEST_GET_DESCRIPTOR,
		(LIBUSB_DT_STRING << 8) | descriptor_index,
		lang_id, data, (uint16_t) length, 1000);
}

#endif