#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>

#define BUFFER_SIZE 4096

char input_buffer[BUFFER_SIZE];
char output_buffer[BUFFER_SIZE];

int main(int argc, char ** argv)
{
	if(argc==1)
	{
		printf("usage: lyubcho_problem logfile\n");
		exit(EXIT_FAILURE);
	}
	int fd=open(argv[1],O_RDONLY);
	if(fd==-1)
	{
		perror(argv[1]);
		exit(EXIT_FAILURE);
	}
	int read_bytes=0;
	int written_bytes=0;
	while((read_bytes=read(fd,input_buffer,BUFFER_SIZE))>0)
	{
		int i;
		for(i=0;i<read_bytes;i++)
		{
			if(input_buffer[i]!='\0')
			{
				output_buffer[written_bytes++]=input_buffer[i];
				if(written_bytes==BUFFER_SIZE)
				{
					write(1,output_buffer,written_bytes);
					written_bytes=0;
				}
			}
		}
	}
	write(1,output_buffer,written_bytes);
	exit(EXIT_SUCCESS);
}