tee.cc

/** Rohit Sindhu [sindh010]
 *  Aravind Alagiri Ramkumar [alagi005]
 *  Aparna Mahadevan [mahad028]
 */
/**
 * Reads standard input and writes to standard output 
 * and the named file.
 * A simple tee program for a simulated file system.
 * @author Ray Ontko -> Converted to C++ by Kwangsung
 */
#include "Kernel.h"
#include <stdlib.h>
#include <string.h>

#define BUF_SIZE 4096
#define OUTPUT_MODE 0700
using namespace std;

int main(int argc, char ** argv)
{
	char PROGRAM_NAME[8];
	strcpy(PROGRAM_NAME, "tee");

	char name[64];
	memset(name, '\0', 64);

	// initialize the file system simulator kernel
	if(Kernel::initialize() == false)
	{
		cout << "Failed to initialized Kernel" << endl;
		Kernel::exit(1);
	}

	if(argc < 2)
	{
		cout << PROGRAM_NAME << ": usage: " << PROGRAM_NAME << " output-file" << endl;
		Kernel::exit( 1 ) ;
	}

	// give the command line argument a better name
	strcpy(name, argv[1]);

	// create the output file
	int out_fd = Kernel::creat( name , OUTPUT_MODE ) ;
	if( out_fd < 0 )
	{
		Kernel::perror( PROGRAM_NAME ) ;
		cout << PROGRAM_NAME << ": unable to open output file \"" << name << "\"" << endl;
		Kernel::exit( 2 ) ;
	}

	// create a buffer for reading from standard input
//	char buffer[BUF_SIZE] ;
//	memset(buffer, '\0', BUF_SIZE);

	char c;

	// while we can, read from standard input
	int wr_count =0;

	while(1)//cin.eof())
	{
		// read a buffer full of data from standard input
//		cin.get(buffer, BUF_SIZE);

		// if we reach the end (-1), quit the loop
//if(cin.eof())
//{
//	break ;
//}
		c = cin.get();

		if(cin.eof())
		{
			break;
		}

		// write what we read to the output file; if error, exit
		wr_count = Kernel::write(out_fd, &c, 1);//buffer, strlen(buffer));
		if( wr_count <= 0 )
		{
			cout << endl;
			Kernel::perror(PROGRAM_NAME);
			cout << PROGRAM_NAME << ": error during write to output file"<< endl;
			Kernel::exit( 3 ) ;
		}

		// write what we read to standard output
		cout << c;//"  -> " << wr_count << "bytes written" << endl;
	}

	// close the output file
	Kernel::close( out_fd ) ;

	// exit with success
	Kernel::exit( 0 ) ;
}