/*-----------------------------------------------------
 Implementation of Opts class
 for command line options

 Generated by aargh 1.1.3
 Sun Feb 12 10:08:59 2006
-----------------------------------------------------*/
#include <stdlib.h>
#include <errno.h>
#include <ctype.h>
#include <iostream>
#include <unistd.h>

#include "opts.h"

namespace std {}
using namespace std;

void Opts::initialize()
{
	new_argc_ = 0;
	new_argv_ = NULL;

	infile_found_ = false;
	infile_.erase();
	counter_found_ = false;
	counter_ = 0;
	verbose_ = false;
}

int Opts::get( int argc, char * argv[] )
{
	int rc = 0; /* return code */
	unsigned long counter_value = 0;
	char * tail = NULL;

	// Initialize data members as needed

	if( populated )
		initialize();
	else
		populated = true;

	// Suppress error messages from getopt()

	opterr = 0;

	// Define valid option characters

	const char optstring[] = ":f:n:v";

	// Examine command line options

	int opt;
	while( ( opt = getopt( argc, argv, optstring ) ) != -1 )
	{
		switch( opt )
		{
			case 'f' :   // Get infile
				if( infile_found_ )
				{
					cerr << "Only one occurrence of -f option allowed\n";
					rc = 1;
					break;
				}
				infile_found_ = true;

				infile_ = optarg;
				break;
			case 'n' :   // Get counter
				if( counter_found_ )
				{
					cerr << "Only one occurrence of -n option allowed\n";
					rc = 1;
					break;
				}
				counter_found_ = true;

				// Skip white space; check for negative

				while( isspace( (unsigned char) *optarg ) )
					++optarg;

				if( '-' == *optarg )
				{
					cerr << "Negative argument not allowed for "
					     << "-n option: \"" << optarg << "\"\n";
					rc = 1;
					break;
				}

				// Convert to numeric value

				errno = 0;
				counter_value = strtoul( optarg, &tail, 10 );
				if( *tail != '\0' )
				{
					cerr << "Invalid or non-numeric argument to "
					     << "-n option: \"" << optarg << "\"\n";
					rc = 1;
					break;
				}
				else if( errno != 0 )
				{
					cerr << "Too large argument to "
					     << "-n option: \'" << optarg << "\"\n";
					rc = 1;
					break;
				}

				counter_ = counter_value;

				break;
			case 'v' :   // Get verbose
				verbose_ = true;
				break;
			case ':' : // Missing argument
				cerr << "Required argument missing on '-"
				     << static_cast< char >( optopt ) 
					 << "' option\n";
				rc = 1;
				break;
			case '?' : // Invalid option
				cerr << "Invalid option '-"
				     << static_cast< char >( optopt ) 
					 << "' on command line\n";
				rc = 1;
				break;
			default :  // Programmer error
				cerr << "Internal error: unexpected value '-"
				     << static_cast< char >( optopt ) 
					 << "' of optopt\n";
				rc = 1;
				break;
		} // end switch
	} // end while

	if( optind > argc )
	{
		// This should never happen!

		cerr << "Program error: found more arguments than expected\n";
		rc = 1;
	}
	else
	{
		// Calculate new_argcv_ and new_argc_ to reflect
		// the number of arguments consumed

		new_argc_ = argc - optind + 1;
		new_argv_ = argv + optind - 1;
	}

	return rc;
}