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

int main(int argc, char **argv)
{
#ifndef BS
#define BS  512
#endif

	int     	i;
	int         o;
	char        buffer[BS];
	size_t      n;

	fprintf(stderr,"Copy %s %s usign read/write\n", argv[1], argv[2]);

	if ( -1 == ( o = open( argv[2], O_WRONLY|O_CREAT, 0666)))
	{
		perror("open");
		return 1;
	}

	if ( -1 == ( i = open( argv[1], O_RDONLY)))
	{
		perror(argv[1]);
		close(o);
		return 1;
	}


	lseek(i, -36863, SEEK_END);

	while ( 0 < ( n = read( i, buffer, BS )))
		write( o, buffer, n );


	if ( errno != 0 )
		perror("read");

	close(i);
	close(o);
}