[C2M] ungetc_func should take a user supplied void pointer argument

[dibyendumajumdar]

The c2mir_compile() takes ungetc_func function as parameter. However ungetc_func() implementation needs to be able to refer to some state in order to work. The standard way to allow the ungetc_func() to access its state is to pass a void * argument which is then passed to ungetc_func().

At the moment the only way for ungetc_func() to work is to access through static lifetime data.

[vnmakarov]

OK. I see. Thank you. I'll do it on this week.

[vnmakarov]

I've added the state for ungetc_func. Here is the patch https://github.com/vnmakarov/mir/compare/5f91154..f7e73aa

[dibyendumajumdar]

@vnmakarov Thank you - much appreciated!