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deps/hidapi/libusb/hid.c  view on Meta::CPAN

			return -1;

		if (skipped_report_id)
			actual_length++;

		return actual_length;
	}
}

/* Helper function, to simplify hid_read().
   This should be called with dev->mutex locked. */
static int return_data(hid_device *dev, unsigned char *data, size_t length)
{
	/* Copy the data out of the linked list item (rpt) into the
	   return buffer (data), and delete the liked list item. */
	struct input_report *rpt = dev->input_reports;
	size_t len = (length < rpt->len)? length: rpt->len;
	if (len > 0)
		memcpy(data, rpt->data, len);
	dev->input_reports = rpt->next;
	free(rpt->data);