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Message-ID: <20150417202126.GD6817@brightrain.aerifal.cx>
Date: Fri, 17 Apr 2015 16:21:26 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: Explicit casts in ctype.h suppress compiler warnings
On Fri, Apr 17, 2015 at 09:43:24PM +0200, Szabolcs Nagy wrote:
> * Szabolcs Nagy <nsz@...t70.net> [2015-04-17 20:35:12 +0200]:
> > > I admit I was thinking of doing isspace-style inlines everywhere, but thanks
> > > to your suggestion I was able to come up with this:
> > >
> > > static __inline void __is_int(int a) {}
> > > #define isdigit(a) (__is_int(0?(a):0), ((unsigned)(a)-'0') < 10)
> > >
> >
> > i think using :0 there is not useful because null
> > pointer constants are special in ?:
> >
>
> ah i see what you are doing there now
Yes, this is exactly the type of thing I hoped could be done.
> meanwhile i tested that (__extension__ (unsigned){a})
> is accepted without warning in c89 mode
Try again with -pedantic.
Rich
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