[Toybox] [PATCH] Implement `file -`.

[enh]

the FSF file(1) is inconsistent too, in a way that suggests it's being
clever:

~$ file /dev/zero
/dev/zero: character special (1/5)
~$ file - < /dev/zero
/dev/stdin: data
~$



On Thu, May 3, 2018, 18:36 Rob Landley <rob at landley.net> wrote:

> On 05/03/2018 06:40 PM, enh wrote:
> > +    // If we're working on stdin, copy to a temporary file and then use
> > +    // an fd for that file. That way the rest of the code doesn't have
> to
> > +    // worry about non-seekable/non-mmap'able input.
>
> Hmmm, in the old code:
>
> $ ./file ../filesystems.tar.gz
> ../filesystems.tar.gz: gzip compressed data
> $ ./file - < ../filesystems.tar.gz
> -: gzip compressed data
> $ file /dev/zero
> /dev/zero: character special
> $ file - < /dev/zero
> /dev/stdin: data
>
> That's inconsistent about /dev/zero, not sure why.
>
> But if we copy /dev/zero to a temp file we'll fill the hard drive...
>
> Rob
>
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