cam: Extract option parser to separate file

And turn it into an OptionsParser object.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

1 files changed, 62 insertions, 0 deletions

diff --git a/src/cam/options.h b/src/cam/options.h
new file mode 100644
index 00000000..88336dfe
--- /dev/null
+++ b/src/cam/options.h
@@ -0,0 +1,62 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * options.h - cam - Options parsing
+ */
+#ifndef __CAM_OPTIONS_H__
+#define __CAM_OPTIONS_H__
+
+#include <ctype.h>
+#include <map>
+#include <vector>
+
+class OptionsParser
+{
+public:
+	enum OptionArgument {
+		ArgumentNone,
+		ArgumentRequired,
+		ArgumentOptional,
+	};
+
+	class Options {
+	public:
+		Options();
+		Options(Options &&other);
+		Options &operator=(Options &&other);
+
+		bool valid() const;
+		bool isSet(int opt) const;
+		const std::string &operator[](int opt) const;
+
+	private:
+		friend class OptionsParser;
+		std::map<int, std::string> values_;
+		void clear();
+	};
+
+	void addOption(int opt, const char *help, const char *name = nullptr,
+		       OptionArgument argument = ArgumentNone,
+		       const char *argumentName = nullptr);
+
+	Options parse(int argc, char *argv[]);
+	void usage();
+
+private:
+	struct Option {
+		int opt;
+		const char *name;
+		OptionArgument argument;
+		const char *argumentName;
+		const char *help;
+
+		bool hasShortOption() const { return isalnum(opt); }
+		bool hasLongOption() const { return name != nullptr; }
+	};
+
+	std::vector<Option> options_;
+	std::map<unsigned int, Option *> optionsMap_;
+};
+
+#endif /* __CAM_OPTIONS_H__ */