#include <unistd.h>
#include <string.h>
#include <libgen.h>

static int my_write(int fd, const char *s, size_t l)
{
	if (!l) l = strlen(s);
	while (l) {
		ssize_t n = write(fd, s, l);
		if (n<0) return -1;
		s += n; l -= n;
	}
	return 0;
}

int main(int argc, char *argv[])
{
	char *s;
	if (argc != 2) {
		my_write(2, argv[0], 0);
		my_write(2, ": missing operand\n", 0);
		return 1;
	}
	s = dirname(argv[1]);
	if (my_write(1, s, 0)<0 || my_write(1, "\n", 1)<0)
		return 1;
	return 0;
}