Lshal: support commands.

Support the following commands:
  lshal list
  lshal list -itrpc
  lshal help
  lshal help list
  lshal list -h
  lshal list --help

Test: run these commands
Bug: 37725279
Change-Id: I970fbc8d250d43f57e92f783229e0645d7e8df4e
Merged-In: I970fbc8d250d43f57e92f783229e0645d7e8df4e
diff --git a/cmds/lshal/utils.h b/cmds/lshal/utils.h
new file mode 100644
index 0000000..9720094
--- /dev/null
+++ b/cmds/lshal/utils.h
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef FRAMEWORK_NATIVE_CMDS_LSHAL_UTILS_H_
+#define FRAMEWORK_NATIVE_CMDS_LSHAL_UTILS_H_
+
+#include <iomanip>
+#include <iostream>
+#include <string>
+#include <sstream>
+#include <utility>
+#include <vector>
+
+namespace android {
+namespace lshal {
+
+enum : unsigned int {
+    OK                                      = 0,
+    USAGE                                   = 1 << 0,
+    NO_BINDERIZED_MANAGER                   = 1 << 1,
+    NO_PASSTHROUGH_MANAGER                  = 1 << 2,
+    DUMP_BINDERIZED_ERROR                   = 1 << 3,
+    DUMP_PASSTHROUGH_ERROR                  = 1 << 4,
+    DUMP_ALL_LIBS_ERROR                     = 1 << 5,
+    IO_ERROR                                = 1 << 6,
+};
+using Status = unsigned int;
+
+struct Arg {
+    int argc;
+    char **argv;
+};
+
+template <typename A>
+std::string join(const A &components, const std::string &separator) {
+    std::stringstream out;
+    bool first = true;
+    for (const auto &component : components) {
+        if (!first) {
+            out << separator;
+        }
+        out << component;
+
+        first = false;
+    }
+    return out.str();
+}
+
+std::string toHexString(uint64_t t);
+
+template<typename String>
+std::pair<String, String> splitFirst(const String &s, char c) {
+    const char *pos = strchr(s.c_str(), c);
+    if (pos == nullptr) {
+        return {s, {}};
+    }
+    return {String(s.c_str(), pos - s.c_str()), String(pos + 1)};
+}
+
+std::vector<std::string> split(const std::string &s, char c);
+
+void replaceAll(std::string *s, char from, char to);
+
+}  // namespace lshal
+}  // namespace android
+
+#endif  // FRAMEWORK_NATIVE_CMDS_LSHAL_UTILS_H_