Generating G Code from MDI history log

#include <stdio.h>    /* Standard input/output definitions */
#include <stdlib.h> 
#include <stdint.h>   /* Standard types */
#include <string.h>   /* String function definitions */
#include <unistd.h>   /* UNIX standard function definitions */
#include <fcntl.h>    /* File control definitions */
#include <errno.h>    /* Error number definitions */

#include <qfile.h>
#include <qstring.h>
#include <qtextstream.h>

int main(int argc, char **argv) 
{
QString cord_file, mdi_file, ngc_file, header, footer;
// these are just to make debugging easier, not really used
    if(argc < 5)
        {
        puts("Usage: splice header footer co-ordinates mdi-history output-file");
        return(1);
        }

    QFile hdr(header = argv[1]);
    QFile ftr(footer = argv[2]);
    QFile cfile( cord_file = argv[3] );
    QFile mfile( mdi_file = argv[4] );
    QFile nfile( ngc_file = argv[5]);
    
   	if ( hdr.open( IO_ReadOnly ) && ftr.open( IO_ReadOnly) && cfile.open( IO_ReadOnly ) && mfile.open( IO_ReadOnly ) && nfile.open( IO_WriteOnly )) 
		{
        QTextStream hstream( &hdr);
        QTextStream fstream( &ftr);        
        QTextStream cstream( &cfile );
        QTextStream mstream( &mfile );
        QTextStream nstream( &nfile );        	        	
        
        while(!hstream.atEnd())	
            nstream << hstream.readLine() << "\n";
        	
        while(!cstream.atEnd())	
            {
            nstream << "G00 " << cstream.readLine() << "\n";
            while(!mstream.atEnd())	
                {
                nstream << mstream.readLine() << "\n";           
                }
            mstream.device()->at( 0 );
            }
        
        while(!fstream.atEnd())	
            nstream << fstream.readLine() << "\n";
        
        hdr.close();
        ftr.close();
        cfile.close();
        mfile.close();
        nfile.close();
        }
    else
        {
        puts("Error: Unable open a specified input file");
        return(1);
        }

return(0);         	
}