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

/*
 * buftest.c - tests copying files with varying buffer sizes
 *
 *   usage: reads from stdin to stdout but takes buffer size as arg
 */

main(int ac, char **av)
{
	char	*buf;
	int	buflen;
	int	n;

	if ( ac == 1 || ( buflen = atoi(av[1])) <= 0 ){
		buflen = 512;
	}

	buf = (char *) malloc(buflen);
	while( (n = read(0, buf, buflen)) > 0 ){
		if ( write(1, buf, n) != n )
			break;
	}
}