Import libusb 1.0.9-rc3 into third_party

third_party/libusb/examples/lsusb.c

+/*
+ * libusb example program to list devices on the bus
+ * Copyright (C) 2007 Daniel Drake <dsd@gentoo.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+
+#include <libusb.h>
+
+static void print_devs(libusb_device **devs)
+{
+        libusb_device *dev;
+        int i = 0;
+
+        while ((dev = devs[i++]) != NULL) {
+                struct libusb_device_descriptor desc;
+                int r = libusb_get_device_descriptor(dev, &desc);
+                if (r < 0) {
+                        fprintf(stderr, "failed to get device descriptor");
+                        return;
+                }
+
+                printf("%04x:%04x (bus %d, device %d)\n",
+                        desc.idVendor, desc.idProduct,
+                        libusb_get_bus_number(dev), libusb_get_device_address(dev));
+        }
+}
+
+int main(void)
+{
+        libusb_device **devs;
+        int r;
+        ssize_t cnt;
+
+        r = libusb_init(NULL);
+        if (r < 0)
+                return r;
+
+        cnt = libusb_get_device_list(NULL, &devs);
+        if (cnt < 0)
+                return (int) cnt;
+
+        print_devs(devs);
+        libusb_free_device_list(devs, 1);
+
+        libusb_exit(NULL);
+        return 0;
+}
+