Userland: Add lsusb :^)

Userland/Utilities/lsusb.cpp

@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2021, Jesse Buhagiar <[email protected]>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/ByteBuffer.h>
+#include <AK/JsonArray.h>
+#include <AK/JsonObject.h>
+#include <AK/LexicalPath.h>
+#include <AK/String.h>
+#include <LibCore/ArgsParser.h>
+#include <LibCore/DirIterator.h>
+#include <LibCore/File.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int main(int argc, char** argv)
+{
+ if (pledge("stdio rpath", nullptr) < 0) {
+ perror("pledge");
+ return 1;
+ }
+
+ if (unveil("/proc/bus/usb", "r") < 0) {
+ perror("unveil");
+ return 1;
+ }
+
+ if (unveil(nullptr, nullptr) < 0) {
+ perror("unveil");
+ return 1;
+ }
+
+ Core::ArgsParser args;
+ args.set_general_help("List USB devices.");
+ args.parse(argc, argv);
+
+ Core::DirIterator usb_devices("/proc/bus/usb", Core::DirIterator::SkipDots);
+
+ while (usb_devices.has_next()) {
+ auto full_path = LexicalPath(usb_devices.next_full_path());
+
+ auto proc_usb_device = Core::File::construct(full_path.string());
+ auto bus_id = proc_usb_device->filename().split('/').last();
+ if (!proc_usb_device->open(Core::OpenMode::ReadOnly)) {
+ warnln("Failed to open {}: {}", proc_usb_device->name(), proc_usb_device->error_string());
+ continue;
+ }
+
+ auto contents = proc_usb_device->read_all();
+ auto json = JsonValue::from_string(contents);
+ VERIFY(json.has_value());
+
+ json.value().as_array().for_each([bus_id](auto& value) {
+ auto& device_descriptor = value.as_object();
+
+ auto vendor_id = device_descriptor.get("vendor_id").to_u32();
+ auto product_id = device_descriptor.get("product_id").to_u32();
+
+ outln("Device {}: ID {:04x}:{:04x}", bus_id, vendor_id, product_id);
+ });
+ }
+
+ return 0;
+}