bug#8545: issues with recent doprnt-related changes

[Stefan Monnier]

>> * doprnt returns size_t.  But Stefan wrote that he prefers sizes to be
>> signed values, and doprnt always returns a value that can fit in
>> EMACS_INT.  So shouldn't doprnt return EMACS_INT, as it did before?
> I made it return size_t because all the related variables in verror
> are size_t, and I didn't want to mix signed with unsigned.  AFAIU, the
> preference to use signed is for those values that come from Lisp or go
> back to the Lisp level, which is not the case here.

Mixing the two is what I find problematic, so if it's size_t all the
way, that's OK.


        Stefan