lshal: add HelpCommand
Add *Command::usage() function for each Command and let
Lshal class to call them.
Suppress output from getopt_long and write our own
error message to customized error stream (for testing).
Test: lshal_test
Test: lshal --help
Change-Id: I8f5847c84a3e01af29fa85871479cab3baeb5312
diff --git a/cmds/lshal/HelpCommand.h b/cmds/lshal/HelpCommand.h
new file mode 100644
index 0000000..3cc0d80
--- /dev/null
+++ b/cmds/lshal/HelpCommand.h
@@ -0,0 +1,45 @@
+/*
+ * 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_HELP_COMMAND_H_
+#define FRAMEWORK_NATIVE_CMDS_LSHAL_HELP_COMMAND_H_
+
+#include <string>
+
+#include <android-base/macros.h>
+
+#include "Command.h"
+#include "utils.h"
+
+namespace android {
+namespace lshal {
+
+class Lshal;
+
+class HelpCommand : public Command {
+public:
+ HelpCommand(Lshal &lshal) : Command(lshal) {}
+ ~HelpCommand() = default;
+ Status main(const Arg &arg) override;
+ void usage() const override;
+ Status usageOfCommand(const std::string& c) const;
+};
+
+
+} // namespace lshal
+} // namespace android
+
+#endif // FRAMEWORK_NATIVE_CMDS_LSHAL_HELP_COMMAND_H_