[1] Character Set, 2021-01-16T08:19:47.000Z https://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap06.html
[2] Character Set, 2021-01-16T08:19:58.000Z https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap06.html
[4] 関連: ASCII, charmap