usb.c: Fix usb_get_port_path() issue on Mac OS X.

Apparently (some versions of) Mac OS X have the same problem with
usb_get_port_path() as FreeBSD does. Work around this in the same way.

Thanks to hanyazou@gmail.com for the patch!

This fixes bug #673.

diff --git a/src/usb.c b/src/usb.c
index a084f322d33ed088128768c3b93e1697e85777cf..ba56e864c12ccf64260e5d824f01655b24db78aa 100644 (file)
--- a/src/usb.c
+++ b/src/usb.c
@@ -484,19 +484,20 @@ SR_PRIV int usb_get_port_path(libusb_device *dev, char *path, int path_len)
 /*
  * FreeBSD requires that devices prior to calling libusb_get_port_numbers()
  * have been opened with libusb_open().
+ * This apparently also applies to some Mac OS X versions.
  */
-#ifdef __FreeBSD__
+#if defined(__FreeBSD__) || defined(__APPLE__)
        struct libusb_device_handle *devh;
        if (libusb_open(dev, &devh) != 0)
                return SR_ERR;
 #endif
        n = libusb_get_port_numbers(dev, port_numbers, sizeof(port_numbers));
-#ifdef __FreeBSD__
+#if defined(__FreeBSD__) || defined(__APPLE__)
        libusb_close(devh);
 #endif
 
-/* Workaround FreeBSD libusb_get_port_numbers() returning 0. */
-#ifdef __FreeBSD__
+/* Workaround FreeBSD / Mac OS X libusb_get_port_numbers() returning 0. */
+#if defined(__FreeBSD__) || defined(__APPLE__)
        if (n == 0) {
                port_numbers[0] = libusb_get_device_address(dev);
                n = 1;