Created program with params

server/.gitignore

@@ -0,0 +1 @@
+cardnet

server/argh.h

@@ -0,0 +1,328 @@
+#pragma once
+
+#include <algorithm>
+#include <sstream>
+#include <string>
+#include <vector>
+#include <set>
+#include <map>
+#include <cassert>
+
+namespace argh
+{
+   // Terminology:
+   // A command line is composed of 2 types of args:
+   // 1. Positional args, i.e. free standing values
+   // 2. Options: args beginning with '-'. We identify two kinds:
+   //    2.1: Flags: boolean options =>  (exist ? true : false)
+   //    2.2: Parameters: a name followed by a non-option value
+
+#if !defined(__GNUC__) || (__GNUC__ >= 5)
+   using string_stream = std::istringstream;
+#else
+    // Until GCC 5, istringstream did not have a move constructor.
+    // stringstream_proxy is used instead, as a workaround.
+   class stringstream_proxy
+   {
+   public:
+      stringstream_proxy() = default;
+
+      // Construct with a value.
+      stringstream_proxy(std::string const& value) :
+         stream_(value)
+      {}
+
+      // Copy constructor.
+      stringstream_proxy(const stringstream_proxy& other) :
+         stream_(other.stream_.str())
+      {
+         stream_.setstate(other.stream_.rdstate());
+      }
+
+      void setstate(std::ios_base::iostate state) { stream_.setstate(state); }
+
+      // Stream out the value of the parameter.
+      // If the conversion was not possible, the stream will enter the fail state,
+      // and operator bool will return false.
+      template<typename T>
+      stringstream_proxy& operator >> (T& thing)
+      {
+         stream_ >> thing;
+         return *this;
+      }
+
+
+      // Get the string value.
+      std::string str() const { return stream_.str(); }
+
+      std::stringbuf* rdbuf() const { return stream_.rdbuf(); }
+
+      // Check the state of the stream. 
+      // False when the most recent stream operation failed
+      operator bool() const { return !!stream_; }
+
+      ~stringstream_proxy() = default;
+   private:
+      std::istringstream stream_;
+   };
+   using string_stream = stringstream_proxy;
+#endif
+
+   class parser
+   {
+   public:
+      enum Mode { PREFER_FLAG_FOR_UNREG_OPTION = 1 << 0,
+                  PREFER_PARAM_FOR_UNREG_OPTION = 1 << 1,
+                  NO_SPLIT_ON_EQUALSIGN = 1 << 2,
+                  SINGLE_DASH_IS_MULTIFLAG = 1 << 3,
+                };
+
+      parser() = default;
+      parser(int argc, const char* const argv[], int mode = PREFER_FLAG_FOR_UNREG_OPTION)
+      {
+         parse(argc, argv, mode);
+      }
+
+      void add_param(std::string const& name);
+      void parse(int argc, const char* const argv[], int mode = PREFER_FLAG_FOR_UNREG_OPTION);
+
+      std::multiset<std::string>          const& flags()    const { return flags_; }
+      std::map<std::string, std::string>  const& params()   const { return params_; }
+      std::vector<std::string>            const& pos_args() const { return pos_args_; }
+
+      //////////////////////////////////////////////////////////////////////////
+      // Accessors
+
+      // flag (boolean) accessors: return true if the flag appeared, otherwise false.
+      bool operator[](std::string const& name);
+
+      // returns positional arg string by order. Like argv[] but without the options
+      std::string const& operator[](size_t ind);
+
+      // returns a std::istream that can be used to convert a positional arg to a typed value.
+      string_stream operator()(size_t ind);
+
+      // same as above, but with a default value in case the arg is missing (index out of range).
+      template<typename T>
+      string_stream operator()(size_t ind, T&& def_val);
+
+      // parameter accessors, give a name get an std::istream that can be used to convert to a typed value.
+      // call .str() on result to get as string
+      string_stream operator()(std::string const& name);
+
+      // same as above, but with a default value in case the param was missing.
+      // Non-string def_val types must have an operator<<() (output stream operator)
+      // If T only has an input stream operator, pass the string version of the type as in "3" instead of 3.
+      template<typename T>
+      string_stream operator()(std::string const& name, T&& def_val);
+
+   private:
+      string_stream bad_stream() const;
+      std::string trim_leading_dashes(std::string const& name);
+      bool is_number(std::string const& arg);
+      bool is_option(std::string const& arg);
+
+   private:
+      std::vector<std::string> args_;
+      std::map<std::string, std::string> params_;
+      std::vector<std::string> pos_args_;
+      std::multiset<std::string> flags_;
+      std::set<std::string> registeredParams_;
+      std::string empty_;
+   };
+
+
+   //////////////////////////////////////////////////////////////////////////
+
+   void parser::parse(int argc, const char* const argv[], int mode /*= PREFER_FLAG_FOR_UNREG_OPTION*/)
+   {
+      // convert to strings
+      args_.resize(argc);
+      std::transform(argv, argv + argc, args_.begin(), [](const char* const arg) { return arg;  });
+
+      // parse line
+      for (auto i = 0u; i < args_.size(); ++i)
+      {
+         if (!is_option(args_[i]))
+         {
+            pos_args_.emplace_back(args_[i]);
+            continue;
+         }
+
+         auto name = trim_leading_dashes(args_[i]);
+
+         if (!(mode & NO_SPLIT_ON_EQUALSIGN))
+         {
+            auto equalPos = name.find('=');
+            if (equalPos != std::string::npos)
+            {
+               params_.insert({ name.substr(0, equalPos), name.substr(equalPos + 1) });
+               continue;
+            }
+         }
+
+         // if the option is unregistered and should be a multi-flag
+         if (1 == (args_[i].size() - name.size()) &&                  // single dash
+            argh::parser::SINGLE_DASH_IS_MULTIFLAG & mode &&         // multi-flag mode
+            registeredParams_.find(name) == registeredParams_.end()) // unregistered
+         {
+            for (auto const& c : name)
+            {
+               flags_.emplace(std::string{ c });
+            }
+         }
+
+         // any potential option will get as its value the next arg, unless that arg is an option too
+         // in that case it will be determined a flag.
+         if (i == args_.size() - 1 || is_option(args_[i + 1]))
+         {
+            flags_.emplace(name);
+            continue;
+         }
+
+         // if 'name' is a pre-registered option, then the next arg cannot be a free parameter to it is skipped
+         // otherwise we have 2 modes:
+         // PREFER_FLAG_FOR_UNREG_OPTION: a non-registered 'name' is determined a flag. 
+         //                               The following value (the next arg) will be a free parameter.
+         //
+         // PREFER_PARAM_FOR_UNREG_OPTION: a non-registered 'name' is determined a parameter, the next arg
+         //                                will be the value of that option.
+
+         if (registeredParams_.find(name) != registeredParams_.end() ||
+            argh::parser::PREFER_PARAM_FOR_UNREG_OPTION & mode)
+         {
+            params_.insert({ name, args_[i + 1] });
+            ++i; // skip next value, it is not a free parameter
+            continue;
+         }
+
+         if (argh::parser::PREFER_FLAG_FOR_UNREG_OPTION & mode)
+            flags_.emplace(name);
+      };
+   }
+
+   //////////////////////////////////////////////////////////////////////////
+
+   string_stream parser::bad_stream() const
+   {
+      string_stream bad;
+      bad.setstate(std::ios_base::failbit);
+      return bad;
+   }
+
+   //////////////////////////////////////////////////////////////////////////
+
+   bool parser::is_number(std::string const& arg)
+   {
+      // inefficient but simple way to determine if a string is a number (which can start with a '-')
+      std::istringstream istr(arg);
+      double number;
+      istr >> number;
+      return !(istr.fail() || istr.bad());
+   }
+
+   //////////////////////////////////////////////////////////////////////////
+
+   bool parser::is_option(std::string const& arg)
+   {
+      assert(0 != arg.size());
+      if (is_number(arg))
+         return false;
+      return '-' == arg[0];
+   }
+
+   //////////////////////////////////////////////////////////////////////////
+
+   std::string parser::trim_leading_dashes(std::string const& name)
+   {
+      auto pos = name.find_first_not_of('-');
+      return name.substr(pos);
+   }
+
+   //////////////////////////////////////////////////////////////////////////
+
+   bool parser::operator[](std::string const& name)
+   {
+      return flags_.end() != flags_.find(trim_leading_dashes(name));
+   }
+
+   //////////////////////////////////////////////////////////////////////////
+
+   std::string const& parser::operator[](size_t ind)
+   {
+      if (ind < pos_args_.size())
+         return pos_args_[ind];
+      return empty_;
+   }
+
+   //////////////////////////////////////////////////////////////////////////
+
+   string_stream parser::operator()(std::string const& name)
+   {
+      if (name.empty())
+         return bad_stream();
+
+      auto optIt = params_.find(trim_leading_dashes(name));
+      if (params_.end() == optIt)
+         return bad_stream();
+
+      return string_stream(optIt->second);
+   }
+
+   //////////////////////////////////////////////////////////////////////////
+
+   template<typename T>
+   string_stream parser::operator()(std::string const& name, T&& def_val)
+   {
+      if (name.empty())
+      {
+         std::ostringstream ostr;
+         ostr << def_val;
+         return string_stream(ostr.str());
+      }
+
+      auto optIt = params_.find(trim_leading_dashes(name));
+      if (params_.end() == optIt)
+      {
+         std::ostringstream ostr;
+         ostr << def_val;
+         return string_stream(ostr.str());
+      }
+
+      return string_stream(optIt->second);
+   }
+
+   //////////////////////////////////////////////////////////////////////////
+
+   string_stream parser::operator()(size_t ind)
+   {
+      if (pos_args_.size() <= ind)
+         return bad_stream();
+
+      return string_stream(pos_args_[ind]);
+   }
+
+   //////////////////////////////////////////////////////////////////////////
+
+   template<typename T>
+   string_stream parser::operator()(size_t ind, T&& def_val)
+   {
+      if (pos_args_.size() <= ind)
+      {
+         std::ostringstream ostr;
+         ostr << def_val;
+         return string_stream(ostr.str());
+      }
+
+      return string_stream(pos_args_[ind]);
+   }
+
+   //////////////////////////////////////////////////////////////////////////
+
+   void parser::add_param(std::string const& name)
+   {
+      registeredParams_.insert(trim_leading_dashes(name));
+   }
+}
+
+

server/cardnet.cpp

@@ -0,0 +1,66 @@
+#include <iostream>
+#include <string>
+#include "argh.h"
+
+void exampleMessage();
+
+int main (int argc, char* argv[])
+{
+    std::string file, check;
+    //std::string check = "" ;
+    int port = 0;
+
+    argh::parser cmdl;
+    cmdl.parse(argc, argv, argh::parser::PREFER_PARAM_FOR_UNREG_OPTION);
+
+    if(cmdl["-h"]) // help
+    {
+        exampleMessage();
+    }
+
+    for(auto& param: cmdl.params())
+    {
+        if(!param.first.compare("f")) // card0 file
+        {
+            file = param.second;
+        }
+        if(!param.first.compare("c")) // checker file
+        {
+            check = param.second;
+        }
+        if(!param.first.compare("p")) // port
+        {
+            try 
+            {
+                port = stoi(param.second); // convert to int
+                if (port < 1 || port > 65535) // validate port number
+                    exampleMessage();
+            }
+            catch (std::invalid_argument)
+            {
+                exampleMessage();
+            }
+        }
+    }
+
+    if(file == "" || check == "" || port == 0)
+        exampleMessage();
+
+    std::cout << "File:\t" << file << std::endl;
+    std::cout << "Check:\t" << check << std::endl;
+    std::cout << "Port:\t" << port << std::endl;
+
+
+    return 0;
+}
+
+void exampleMessage()
+{
+    std::cout << "Availble options:" << std::endl;
+    std::cout << "  -f\tLocation of card0.txt file" << std::endl;
+    std::cout << "  -c\tLocation of check file" << std::endl;
+    std::cout << "  -p\tPort number to listen on (1-65535)" << std::endl;
+    std::cout << std::endl << "Example usage: cardnet.exe -f G:\\card0.txt -c G:\\check.txt -p 4500" << std::endl;
+    exit(0);
+
+}