impl char/string IO functions
impl char/string IO functions

koba-e964/picrin,leavesbnw/picrin,picrin-scheme/picrin,picrin-scheme/picrin,ktakashi/picrin,leavesbnw/picrin,leavesbnw/picrin,dcurrie/picrin,koba-e964/picrin,koba-e964/picrin,ktakashi/picrin,omasanori/picrin,dcurrie/picrin,omasanori/picrin,ktakashi/picrin