Date: Fri, 13 Dec 2002 16:41:06 +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: <20021213134106.GA32832@nagual.pp.ru> In-Reply-To: <20021213123240.GC86638@sunbay.com> References: <20021213122654.GA32014@nagual.pp.ru> <20021213123240.GC86638@sunbay.com>
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On Fri, Dec 13, 2002 at 14:32:40 +0200, Ruslan Ermilov wrote:
> Pardon my ignorance here, but the following fragment
> returns -1, doesn't it?
>
> #include <stdio.h>
> void
> main(void)
> {
> int i;
>
> i = (unsigned char)1 - (unsigned char)2;
> printf("%d\n", i);
> }
It very depends on compiler, i.e. does it implements "value preseving" or
"unsigned preserving" for 'char' type conversions. Or ANSI C vs. common C
mode. Better be safe for both.
Read 6.10.1.1 section here:
http://wwwrsphysse.anu.edu.au/doc/DUhelp/AQTLTBTE/DOCU_067.HTM
--
Andrey A. Chernov
http://ache.pp.ru/
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