#include "header.h"

#include <iostream>
#include <cstdlib>
#include <string>
using namespace std;

int main(int argc,char *argv[])
{
  int row=1;
  string iparam="";
  string oparam="";
  string usage="Usage: -i \"input_file\" -o \"output_file\"";

  // check if args have been supplied
  if (argc<=1)
  {
    cerr << usage << endl;
    exit(1);
  }
  // check switches
  else if (argv[1][0] != '-')
  {
    cerr << "invalid switch: " << argv[1] << endl;
    cerr << usage << endl;
    exit(1);
  }
  // stick in/out elements in string iparam/oparam
  while ((row<argc)&&(argv[row][0]=='-'))
  {
    string sw = argv[row];
    if (sw =="-i")
    {
      row++;
      iparam=argv[row];
    }
    else if (sw=="-o")
    {
      row++;
      oparam=argv[row];
    }
    else 
    {
      cerr << "unknown switch: " << argv[row] << endl;
      cerr << usage << endl;
      exit(1);
    }
    row++;
  }
  // check for duplicate filenames
  if (iparam==oparam)
  {
    cerr << "Duplicates found, use unique files." << endl;
    cerr << usage << endl;
    exit(1);
  }
  // this is the "if" i introduced that started giving me the errors
  // I had the previous code working and tested multiple times
  // before implementing this next conditional.

  // exit on more args than required:--
  if (argv[5][0]!=0)
  {
    cerr << "Too many args." << endl;
    cerr << usage << endl;
    exit(1);
  }

  // start app:
  StringSort ss(iparam,oparam);
  ss.runApp();
}

[New thread 5532.0x1794]
(no debugging symbols found)
(...)
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[New thread 5532.0x12e0]
(no debugging symbols found)
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Program recieved signal SIGSEGV, Segmentation fault.
0x004016a9 in ?? ()   
(gdb)  

Program recieved signal SIGSEGV, seg fault.
0z092131 in main (argc=5, argv=0xde2178) at a2Main.cpp:62
62    if (argv[5][0]!=0)