eulermark: truncate files when writing
eulermark: truncate files when writing

japaric/eulermark.rs,japaric/eulermark.rs,japaric/eulermark.rs,japaric/eulermark.rs,japaric/eulermark.rs,japaric/eulermark.rs,japaric/eulermark.rs,japaric/eulermark.rs