A deduplicator for checking for duplicate emails in CPP

dedupe.cpp

/*
 * Copyright 2015 - Simon Sickle
 * CSV DeDuplicator
 * Finds duplicate emails and creates a list of duplicates
 * usage is ./dedupe /path/to/whatever.csv /path/to/dupe.csv
 */

#include <iostream>
#include <fstream>
#include <sstream>
#include <cstring>
#include <string>
using namespace std;

int main (int argc, const char * argv[]) {
	int lineCount = 0;
	int lineNum = 0;
	int numDupes = 0;
	int numTimesRepeat = 0;
	char c;
	string email = "";

	// Check arguments
	if (argc != 3)
	{
		cout << "Usage ./dedupe /path/to/a.csv /path/for/dupe.csv" << endl;
		return -1;
	}

	// Open file
	fstream textfile(argv[1], ios::in);

	// Maks sure file is readable
	if (textfile.good()) {

		// Get line count
		while (textfile.get(c))
		{
			if (c == '\n')
				lineCount++;
		}

		// Print line count
		cout << "There are " << lineCount << " lines." << endl;

		// Create a big enough array to hold at least all the lines
		string * emails = new string[lineCount];
		string * dupes = new string[lineCount];

		// Remove EOF flag and seek to beginning
		textfile.clear();
		textfile.seekg(0, ios::beg);

		// Loop through each line
		for (string line; getline(textfile, line); )
		{
			// copy headers / first line
			if (lineNum == 0)
			{
				dupes[numDupes] = line;
				numDupes++;
			}

			// Turn the line string into stringstream for getline
			stringstream ls(line);

			// Loop through line until find something with an @ in it
			while(getline(ls, email,','))
			{
				if (email.find("@") != string::npos)
					break;
			}

			// Add to email array
			emails[lineNum] = email;

			// Loop through emails array to fund amount of dupes
			for (int i = 0; i <= lineNum; i++)
			{
				// Detect dupe
				if (emails[i] == email)
				{
					numTimesRepeat++;
				}
			}

			// If its only 1, then its not a dupe
			if (numTimesRepeat > 1) {
				dupes[numDupes] = line;
				numDupes++;
			}

			// Reset dupe counter
			numTimesRepeat = 0;

			// Go to the next line
			lineNum++;
		}

		cout << "We found " << numDupes << " duplicates." << endl;

		// Write the dupes to a new csv file
		fstream txtOut(argv[2], ios::out);
		if (txtOut.good())
		{
			for (int i = 0; i < numDupes; i++)
			{
				txtOut << dupes[i] << endl;
			}
		} else {
			cout << "File name to save duplicates under was not valid" << endl;
			return 1;
		}

		// Clean up resources
		textfile.close();
		txtOut.close();
		delete [] emails;
		delete [] dupes;

		// Return 0 for good in *nix
		return 0;
	}

	cout << "Could not read the file provided" << endl;
	return 1;
}