Date: Fri, 13 Dec 2002 18:34:28 +0300 From: "Andrey A. Chernov" <ache@nagual.pp.ru> To: Ruslan Ermilov <ru@FreeBSD.ORG> Cc: bwk@bell-labs.com, obrien@FreeBSD.ORG, current@FreeBSD.ORG Subject: Re: New AWK bug with collating Message-ID: <20021213153428.GA33916@nagual.pp.ru> In-Reply-To: <20021213150942.GE86638@sunbay.com> References: <20021213122654.GA32014@nagual.pp.ru> <20021213123240.GC86638@sunbay.com> <20021213134106.GA32832@nagual.pp.ru> <20021213150942.GE86638@sunbay.com>
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On Fri, Dec 13, 2002 at 17:09:42 +0200, Ruslan Ermilov wrote:
> :
> : * Integer types `unsigned short' and `unsigned char' promote to
> : `unsigned int'.
>
> With -traditional, the code I quoted still produces -1.
Probably because of machine-specific overflow handling or printf overflow.
Use this safe example instead (with -traditional):
main()
{
long long l;
unsigned char a = 1;
unsigned char b = 2;
l = a - b;
printf("%04x %04x\n", (int)((l >> 32) & 0xffff), (int)(l & 0xffff));
l = -1;
printf("%04x %04x\n", (int)((l >> 32) & 0xffff), (int)(l & 0xffff));
}
> In any case, this section doesn't apply to this case because
> no conversion described in section 6.10 is ever done here,
> since both operands are of the same type, "unsigned char".
No, any char type converted to int (or to unsigned int with -traditional)
prior to any operation with it.
--
Andrey A. Chernov
http://ache.pp.ru/
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