Font_ApplyFields

[Ralph Corderoy]

Hi,

Sorry to but in, it isn't what I'm here for, but...

> > In all versions of FontManager up to and including 3.36,
> > Font_ApplyFields corrupted R5-R7. The OSLib veneers don't know
> > this, so font_apply_fields ends up not being APCS compliant.
> 
> The only way I can see of fixing this is produce a hand-crafted
> veneer which saves and restores these registers around the SWI call,
> and pathch it in to the library a similar fashion to
> OSReadVarValSize. Is there a better way?

Given this is the second time it's has been needed why not extend the
grammar to allow `exceptions' to the normal interface to be defined.
Even if it is just a mechanism to say `save lots more registers than
should strictly be necessary'.

Cheers,


Ralph.