//---------------------------------------------------
// Purpose: Remove all non-ascii characters from a file
// Author:  John Gauch 
//---------------------------------------------------
#include <cstdlib>
#include <fstream>
#include <iostream>
using namespace std;

int main(int argc, char *argv[])
{
   // Error checking arguments
   if (argc != 3)
   {
      cerr << "Usage: ascii infile outfile\n";
      exit(EXIT_FAILURE);
   }

   // Open input file
   ifstream din;
   din.open(argv[1]);
   if (din.fail())
   {
      cerr << "Error not open input file: " << argv[1] << endl;
      exit(EXIT_FAILURE);
   }

   // Open output file
   ofstream dout;
   dout.open(argv[2]);
   if (dout.fail())
   {
      cerr << "Error not open output file:" << argv[2] << endl;
      exit(EXIT_FAILURE);
   }

   // Loop reading and writing 
   char ch;
   const char FIND = 13;
   const char REPLACE = ' ';
   while (din.get(ch))
   {
      if (ch == FIND)
         dout << REPLACE;
      else if (isprint(ch) || isspace(ch))
         dout << ch;
   }

   // Close files
   din.close();
   dout.close();
}