#include <stdio.h>
#include <stdlib.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#define BUFFER_SIZE (16 * 1024)



int main(int argc, char *argv[])
{
	char buffer[BUFFER_SIZE];
	int read_size;
	int in_file;
	int out_file;
	int ch; //EOF

	if(argc != 3){
		fprintf(stderr, "Error: Wrong number of arguments\n");
		fprintf(stderr, "Usage is copy <from> <to>\n");
		exit(8);
	}

	in_file = open(argv[1], O_RDONLY);

	if(in_file < 0){
		fprintf(stderr, "Error: Unable to open %s\n",argv[1]);
		exit(8);
	}

	out_file = open(argv[2], O_WRONLY|O_TRUNC|O_CREAT, 0666);
	if(out_file < 0){
		fprintf(stderr, "Error: Unable to open %s\n",argv[2]);
		exit(8);
	}
	
	while(1){
		read_size = read(in_file, buffer, sizeof(buffer));

		if(read_size == 0)
			break;

		if(read_size < 0){
			fprintf(stderr, "Error: Read error\n");
			exit(8);
		}
		write(out_file, buffer, (unsigned int) read_size);
		
	}

	
	while(ch != EOF){

		ch = fgetc(out_file);

		if(ch == '\t')
		{
		fputs("     ", out_file);
		}
	}
	close(in_file);
	close(out_file);
	return 0;

}