Function get_usb_string

dependencies/hidapi/hidapi.c:310–347

This function returns a newly allocated wide string containing the USB device string numbered by the index. The returned string must be freed by using free(). */

   device string numbered by the index. The returned string must be freed
   by using free(). */
static wchar_t *get_usb_string(libusb_device_handle *dev, uint8_t idx)
{
	char buf[512];
	int len;
	wchar_t *str = NULL;

	/* Determine which language to use. */
	uint16_t lang;
	lang = get_usb_code_for_current_locale();
	if (!is_language_supported(dev, lang))
		lang = get_first_language(dev);

	/* Get the string from libusb. */
	len = libusb_get_string_descriptor(dev,
			idx,
			lang,
			(unsigned char*)buf,
			sizeof(buf));
	if (len < 0)
		return NULL;

	/* Bionic does not have iconv support nor wcsdup() function, so it
	   has to be done manually.  The following code will only work for
	   code points that can be represented as a single UTF-16 character,
	   and will incorrectly convert any code points which require more
	   than one UTF-16 character.

	   Skip over the first character (2-bytes).  */
	len -= 2;
	str = malloc((len / 2 + 1) * sizeof(wchar_t));
	int i;
	for (i = 0; i < len / 2; i++) {
		str[i] = buf[i * 2 + 2] | (buf[i * 2 + 3] << 8);
	}
	str[len / 2] = 0x00000000;

	return str;
}

static char *make_path(libusb_device *dev, int interface_number)
{