Utilities: Add an lscpu utility

Userland/Utilities/CMakeLists.txt

@@ -126,6 +126,7 @@ target_link_libraries(less LibMain)
 target_link_libraries(ln LibMain)
 target_link_libraries(logout LibMain)
 target_link_libraries(ls LibMain)
+target_link_libraries(lscpu LibMain)
 target_link_libraries(lsirq LibMain)
 target_link_libraries(lsof LibMain)
 target_link_libraries(lspci LibPCIDB LibMain)

Userland/Utilities/lscpu.cpp

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2022, Undefine <undefine@undefine.pl>.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/Format.h>
+#include <AK/JsonArray.h>
+#include <AK/JsonObject.h>
+#include <LibCore/File.h>
+#include <LibCore/System.h>
+#include <LibMain/Main.h>
+
+static void print_cpu_info(JsonObject const& value)
+{
+    outln("CPU {}:", value.get("processor").as_u32());
+    outln("\tVendor ID: {}", value.get("cpuid").as_string());
+    outln("\tModel: {}", value.get("brand").as_string());
+    outln("\tFamily: {}", value.get("family").as_u32());
+    outln("\tModel: {}", value.get("model").as_u32());
+    outln("\tStepping: {}", value.get("stepping").as_u32());
+    outln("\tType: {}", value.get("type").as_u32());
+    out("\tFeatures: ");
+
+    auto& features = value.get("features").as_array();
+
+    for (auto const& feature : features.values())
+        out("{} ", feature.as_string());
+
+    outln();
+}
+
+ErrorOr<int> serenity_main(Main::Arguments)
+{
+    TRY(Core::System::pledge("stdio rpath"));
+
+    TRY(Core::System::unveil("/proc/cpuinfo", "r"));
+    TRY(Core::System::unveil(nullptr, nullptr));
+
+    auto file = TRY(Core::File::open("/proc/cpuinfo", Core::OpenMode::ReadOnly));
+    auto json = TRY(JsonValue::from_string(file->read_all()));
+    auto& array = json.as_array();
+
+    for (size_t i = 0; i < array.size(); i++) {
+        print_cpu_info(array.at(i).as_object());
+        if (i != array.size() - 1)
+            outln();
+    }
+
+    return 0;
+}