[Bug stdio/12836] fmemopen(buf,size,"w+b") isn't binary

["eblake at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=12836

--- Comment #6 from Eric Blake <eblake at redhat dot com> ---
(In reply to paxdiablo from comment #5)
> The POSIX standard calls for fmemopen() to accept all mode strings as
> allowed in fopen() but notes that use of "b" results in
> implementation-defined behaviour.

POSIX has been amended to cater to glibc's behavior of having different
behavior for 'b':
http://austingroupbugs.net/view.php?id=396

And in fact, consensus was that the next version of POSIX should require
glibc's behavior of having saner behavior for 'b':

http://austingroupbugs.net/view.php?id=456

> 
> So, technically, I think an implementation _could_ treat w+b and wb+ as
> different if it so desired but it would have to document that.
> 
> Of course, it would probably be easier to fix the code to make them
> identical :-)

No, we WANT them to be different, per the adjustments to POSIX.

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