#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>

static void die(const char *reason)
{
	fprintf(stderr, "Fatal: %s\n", reason);
	exit(1);
}

static unsigned long find_line(const char *line, unsigned long len)
{
	unsigned long res = 0;
	do {
		res++;
		if (*line == '\n')
			break;
		line++;
	} while (--len);
	return res;
}

int main(int argc, char **argv)
{
	struct stat st;
	char *buf;
	unsigned long len;
	long longest = 0;
	char *line = "";
	int lineno = 0, i;

	if (fstat(0, &st)) die("stat");
	if (!S_ISREG(st.st_mode)) die("Not a regularfile");
	len = st.st_size;
	buf = malloc(len);
	if (!buf) die("malloc failed");
	if (read(0, buf, len) != len) die("read failed");

	for (i = 1; len; i++) {
		unsigned long linelen;
		linelen = find_line(buf, len);
		if (linelen > longest) {
			longest = linelen;
			line = buf;
			lineno = i;
		}
		buf += linelen;
		len -= linelen;
	}

	printf("Longest line is %d (%lukB)\n", lineno, (longest+512) / 1024);
	printf("   '%.*s'\n", (int) longest-1, line);
	return 0;
}