It's not a while loop... well, maybe a "while 1 {}" loop. It's closer to an iterator over argv. First, it sets the firsttime=1 flag, then it tries to open the

It's not a while loop... well, maybe a "while 1 {}" loop. It's closer to an iterator over argv. First, it sets the firsttime=1 flag, then it tries to open the first argument (file). After the first arg, it sets firsttime=0. It only breaks out of the loop once argv is exhausted.