[PATCH 0/5] obstacks again

[Paul Eggert]

Eric Blake wrote:
> Can we use ssize_t instead of size_t for obstack_blank_fast?

Not portably, no.  ssize_t need not be the same width as size_t.

As I understand it, ssize_t was partly invented to support platforms where 
'read' took a 64-bit size_t argument and returned a 32-bit signed result -- and 
ssize_t is therefore best avoided except when dealing directly with system calls 
that return ssize_t.