[RFC] basic_file_stdio.cc changes for 9425 and 9439

[Loren James Rittle]

In article <3E3EDECB.6050004@unitus.it> you write:

> In a nutshell, I propose changing basic_file_stdio.cc in this way:
[...]
> What do you think?

I think it is correct to enhance the error checking and reporting of a
code path.  In this particular case, I think the proposed change
matches what the C89 standard guarantees and I know of no libc/stdio
implementations that fail to match it.  Regards, Loren