Use the *at functions instead of building paths manually. We do
still have path-building in recurse() and other areas, but the
long-term goal is to rid most interfaces of that for practical
and security reasons.
In this case, it's more or less trivial.
Also, refactor the manpage to be more consistent with the others.
BUGFIX: Return exit status 3 on error.
General convention is to use size_t to store sizes of all kinds.
Internally, the function uses double anyway, but at least this
doesn't clobber up the API any more and there's a chance in the
future to make this function a bit cleaner and not use this dirty
static buffer hack any more.
We've already seen the issue with echo(1): Before we changed it to
ignore "--", the command
$ echo --
did not work as expected. Given POSIX mandated this and makes most
sense, in the interest of consistency the other tools need to be
streamlined for that as well.
Looking at yes(1) for instance, there's no reason to skip "--" in
the argument list.
We do not have long options like GNU does and there's no reason to
tinker with that here.
The majority of tools changed are ones taking lists of arguments
or only a single one. There's no reason why dirname should "fail"
on "--". In the end, this is a valid name.
The practice of hand-holding the user was established with the GNU
coreutils. "--help" and "--version" long-options are a disgrace to
what could've been done properly with manpages.
When we selectively process entries from the archive, ensure that
we jump over the data section of each uninteresting entry before going
on to process the next entry. Not doing so, leaves the file stream
pointer in the wrong place.
This particular change does not have any immediate shortcomings.
We still print a warning to alert the user.
Exiting on a chown() failure caused problems when untarring
inside a restricted user namespace on Linux where the uid/gid
mappings were limited.
