//
// Program name:  copyfile
// Author:  J. Oldham
// Modified by:  B. Massingill
//
// Purpose:  copy one file to another file
//
// Input:  
//	source and destination file names (from user)
// Output:  
//	no printed output; destination file will be created, and its
//	contents will be the same as the contents of the source file
//

#include <iostream.h>
#include <fstream.h>		// has fstreams
#include <iomanip.h>		// has setw()
#include <stdlib.h>		// has exit()

//
// **** Function Prototypes ****
//
// Obtain a filename.
void obtainFilename(char fileName[], const int fileNameLength,
		    const char * description);


//
// **** Main Program ****
//
int main()
{
  // Obtain the names of the files.
  const int maxFileLength = 10000;
  char sourceFile[maxFileLength];
  obtainFilename(sourceFile, maxFileLength, "source");

  char destinationFile[maxFileLength];
  obtainFilename(destinationFile, maxFileLength, "destination");

  // Open the file streams.
  ifstream in;
  in.open(sourceFile);
  if (in.fail()) {
    cerr << "Failed to open " << sourceFile << ".\n";
    cerr << "Bailing out!\n";
    exit(1);
  }

  ofstream out;
  out.open(destinationFile);
  if (out.fail()) {
    cerr << "Failed to open " << destinationFile << ".\n";
    cerr << "Bailing out!\n";
    exit(1);
  }

  // Copy the file.
  char c;
  while (in.get(c))
    out.put(c);

  // Close the file streams.
  in.close();
  out.close();

  return 0;
}


// precondition: fileName = array to hold the name of the file
//		 fileNameLength = array's length
//		 description = string describing the desired file
// postcondition: the desired file is stored in fileName

void obtainFilename(char fileName[], const int fileNameLength,
		    const char description[])
{
  cout << "Please enter the filename of the "
       << description << " (max " <<
    fileNameLength-1 << " characters) : ";
  cin >> setw(fileNameLength) >> fileName;
  return;
}