From: maht <maht-9fans@maht0x0r.net>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] portability question
Date: Wed, 16 Jun 2010 14:30:00 +0100 [thread overview]
Message-ID: <4C18D1D8.2060301@maht0x0r.net> (raw)
In-Reply-To: <AANLkTinYjxYQEDBK5u2kohjRwdZA-wIB9hK8nVVnITuV@mail.gmail.com>
On 06/16/10 10:11, hugo rivera wrote:
> Can someone clarify why the program included outputs 'AB000000' (as I
> expect) on 32 bit systems and 'FFFFFFFFAB000000' on 64 bit systems?
> where all those 1's came from? what's the portable way of doing this?
> sorry for newbie questions like this.
>
>
> unsigned long l;
> unsigned char c;
>
> l = 0L;
> c = 0xAB;
> l |= c << 24;
> printf("%lX\n", l);
>
>
check the ASM, looks like c is being cast as signed and then sign
extended into a long and then ORed with l.
perhaps this would solve it :
l |= ((unsigned long) c) << 24
But I can't check
next prev parent reply other threads:[~2010-06-16 13:30 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-16 9:11 hugo rivera
2010-06-16 10:01 ` Lucio De Re
2010-06-16 10:15 ` hugo rivera
2010-06-16 10:27 ` Charles Forsyth
2010-06-16 13:30 ` maht [this message]
2010-06-16 15:26 ` erik quanstrom
2010-06-16 17:52 ` Bakul Shah
2010-06-17 7:50 ` hugo rivera
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