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Re: nonconformant behavior for printf(1) (you cannot interpret - as an o

From: Eric Blake
Subject: Re: nonconformant behavior for printf(1) (you cannot interpret - as an option char)
Date: Mon, 26 Nov 2007 22:09:11 -0700
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According to Rich Felker on 11/26/2007 10:02 PM:
> On Mon, Nov 26, 2007 at 09:54:52PM -0700, Eric Blake wrote:
>> Hash: SHA1
>> Please keep replies on the list, so that others may chime in.


> Printf does not claim conformance to those guidelines; read the
> specific documentation on printf. In fact many utilities do not. You
> have to read the specific documentation on each one.

You should feel free to take this up with the Austin group, then.  This is
not bash's problem, unless you can prove that POSIX intends for printf(1)
to reject the extension of options.

POSIX is quite clear that echo(1) rejects options with the statement "The
echo utility shall not recognize the "−−" argument in the manner specified
by Guideline 10
of XBD Section 12.2; "−−" shall be recognized as a string operand."

For any utility that does not have this explicit rejection, then the
extension of providing options is valid implicitly.  Just because a
portable application cannot use those options does not mean that an
implementation can provide options; therefore, a portable application MUST
use -- to separate the end of theoretical options from the leading argument.

And FWIW, coreutils interprets POSIX in the same manner as bash.

> Again, go read POSIX and if you're still unclear file a RFI. But it's
> very clear and bash is incorrect in this respect.

I'm on the Austin group, and feel quite confident that I understand what
it permits vs. what it requires.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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