Add argument parser
Add command-line argument parser for the main application. This is built
over the GNU getopt.
Change-Id: Ida6ea6894d4832fd631d8bd1e2b6f4a3fb496023
Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
diff --git a/args.cpp b/args.cpp
new file mode 100644
index 0000000..8ec90dd
--- /dev/null
+++ b/args.cpp
@@ -0,0 +1,89 @@
+#include <getopt.h>
+#include <string>
+#include <vector>
+#include <utility>
+#include <iostream>
+#include <sstream>
+#include "args.hpp"
+
+namespace openpower
+{
+namespace vpd
+{
+namespace args
+{
+
+static constexpr auto shortForm = "v:f:o:h";
+static const option longForm[] =
+{
+ { "vpd", required_argument, nullptr, 'v' },
+ { "fru", required_argument, nullptr, 'f' },
+ { "object", required_argument, nullptr, 'o' },
+ { "help", no_argument, nullptr, 'h' },
+ { 0, 0, 0, 0},
+};
+
+void usage(char** argv)
+{
+ std::cerr << "\nUsage: " << argv[0] << " args\n";
+ std::cerr << "args:\n";
+ std::cerr << "--vpd=<vpd file> pathname of file containing vpd,";
+ std::cerr << " for eg an eeprom file\n";
+ std::cerr << "--fru=<FRU type>, supported types:\n";
+ std::cerr << "\t" << "bmc\n";
+ std::cerr << "\t" << "ethernet\n";
+ std::cerr << "Specify multiple FRU types via comma-separated list\n";
+ std::cerr << "--object=<FRU object path> for eg,";
+ std::cerr << " chassis/bmc0/planar\n";
+ std::cerr << "Specify multiple object paths via comma-separated list, "
+ "ordered as the FRU types\n";
+ std::cerr << "--help display usage\n";
+}
+
+Args parse(int argc, char** argv)
+{
+ Args args;
+ int option = 0;
+ if (1 == argc)
+ {
+ usage(argv);
+ }
+ while (-1 !=
+ (option = getopt_long(argc, argv, shortForm, longForm, nullptr)))
+ {
+ if (('h' == option) || ('?' == option))
+ {
+ usage(argv);
+ }
+ else
+ {
+ auto which = &longForm[0];
+ // Figure out which option
+ while ((which->val != option) && (which->val != 0))
+ {
+ ++which;
+ }
+ // If option needs an argument, note the argument value
+ if ((no_argument != which->has_arg) && optarg)
+ {
+ using argList = std::vector<std::string>;
+ argList values;
+ // There could be a comma-separated list
+ std::string opts(optarg);
+ std::istringstream stream(std::move(opts));
+ std::string input {};
+ while (std::getline(stream, input, ','))
+ {
+ values.push_back(std::move(input));
+ }
+ args.emplace(which->name, std::move(values));
+ }
+ }
+ }
+
+ return args;
+}
+
+} // namespace args
+} // namespace vpd
+} // namespace openpower
diff --git a/args.hpp b/args.hpp
new file mode 100644
index 0000000..ee82986
--- /dev/null
+++ b/args.hpp
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <string>
+#include <unordered_map>
+
+namespace openpower
+{
+namespace vpd
+{
+namespace args
+{
+
+using Args = std::unordered_map<std::string,
+ std::vector<std::string>>;
+
+/** @brief Command-line argument parser for openpower-read-vpd
+ *
+ * @param[in] argc - argument count
+ * @param[in] argv - argument array
+ *
+ * @returns map of argument:value
+ */
+Args parse(int argc, char** argv);
+
+/** @brief Display usage of openpower-vpd-read
+ *
+ * @param[in] argv - argument array
+ */
+void usage(char** argv);
+
+} // namespace args
+} // namespace vpd
+} // namespace openpower