flame of roff in 'C' by Butler Hine

[Michael W. Herman]

I, too, had problems with this when I first ran it and haven't tried it much
since.  Try using the roff C source file for input - roff.c.  The
distributed source seems to end up in an infinite loop.  I wouldn't
expect roff to do anything intelligent with C source but it should
have done something reasonable.  

When I used the new readline that Tim Maroney distributed, the problem went way.