Text codepage in groff

Question

How to setup a correct codepage in groff? For example to use a cyrillic language.

Man page notes about -T switch. But troff -T utf8 -ms troff_file.txt gives:

warning: invalid input character code 128`

Answer 1

-Tutf8 only selects the output device. If you want groff to accept Unicode input, use the -K switch.

Another way to have Cyrillic is simply to use Tlatin1 to enable eight-bit character codes, and feed groff a source file in a single-byte encoding such as CP 1251 or KOI8-R. Don't forget to prepare your hyphenation file accordingly.