From: Peter Stephenson <p.stephenson@samsung.com>
To: zsh-workers@zsh.org
Subject: Re: Patch for giga- and terabyte size specifiers
Date: Wed, 19 Feb 2014 13:52:42 +0000 [thread overview]
Message-ID: <20140219135242.47240238@pwslap01u.europe.root.pri> (raw)
In-Reply-To: <201402191412030328.00E5C601@localhost>
On Wed, 19 Feb 2014 14:12:03 +0100
Manuel Presnitz <mpy@gmx.net> wrote:
> I thought it is time to have globbing size specifiers at hand also for
> gigabytes, and while at it for terabytes, too. As that seemed pretty
> straight forward, I tried to do the modification myself.
Generally looks fine, thanks...
> +#if defined(ZSH_64_BIT_TYPE) || defined(LONG_IS_64_BIT)
> + case TT_GIGABYTES:
> + scaled += 1073741823l;
> + scaled /= 1073741824l;
> + break;
> + case TT_TERABYTES:
> + scaled += 1099511627775l;
> + scaled /= 1099511627776l;
> + break;
> +#endif
I suppose we need to be a bit careful here since we don't know the
64-bit type is long, so the suffix may not be right and we might get
overflow of the constant.
I'm not sure if we get away with e.g.
(zlong)1099511627775
--- my C basics aren't up to remembering whether the compiler is
required to look at the type of a cast when interpreting a constant,
but I have a suspicion it isn't.
Otherwise, I guess we need something like...
#if defined(ZSH_64_BIT_TYPE) || defined(LONG_IS_64_BIT)
#ifdef LONG_IS_64_BIT
#define ZLONG_CONST(x) x ## l
#else
#define ZLONG_CONST(x) x ## ll
#endif
case TT_GIGABYTES:
scaled += ZLONG_CONST(1073741823);
scaled /= ZLONG_CONST(1073741824);
break;
case TT_TERABYTES:
scaled += ZLONG_CONST(1099511627775);
scaled /= ZLONG_CONST(1099511627776);
break;
#endif
although probably even that doesn't work for the mysterious "quad" type
mentioned in some bits of the shell. Or maybe I'm being too pernickety.
(I have a feeling this is all done much better in D :-/)
pws
next prev parent reply other threads:[~2014-02-19 13:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-19 13:12 Manuel Presnitz
2014-02-19 13:52 ` Peter Stephenson [this message]
2014-02-19 20:03 ` Peter Stephenson
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