Date: Wed, 18 Jan 1995 21:55:59 +0300 From: "Andrew A. Chernov, Black Mage" <ache@astral.msk.su> To: freebsd-current@freefall.cdrom.com, freebsd-questions@freefall.cdrom.com, "Ugen J.S.Antsilevich" <ugen@netvision.net.il> Subject: Re: GCC bug again... Message-ID: <UB_GM7l4U1@astral.msk.su> In-Reply-To: <Chameleon.950118200622.ugen@ugen.NetManage.co.il>; from "Ugen J.S.Antsilevich" at Wed, 18 Jan 95 20:01:30 IST References: <Chameleon.950118200622.ugen@ugen.NetManage.co.il>
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In message <Chameleon.950118200622.ugen@ugen.NetManage.co.il> Ugen
J.S.Antsilevich writes:
>As you guys completely missed the point of what the bug is
>(probably it was my fault- i wrote too long and unclear mail)
>i repeat it in constructive way:
>1) After those 2 types of lseek file pointer is set to wrong location.
> lseek(f,-sizeof(buf),SEEK_CUR) <--this is withno cast but must hold
> lseek(f,(off_t)-sizeof(buf),SEEK_CUR) <--this one has *RIGHT* cast
>2) This one works and sets pointer to right location.
> lseek(f,(int)-sizeof(buf),SEEK_CUR) <--but the cast is completely wrong!
>That's the bug,now what would you say?
Sizeof is unsigned type, so -unsigned undefined.
Right casts is:
-((off_t)sizeof(buf))
--
Andrew A. Chernov : And I rest so composedly, /Now, in my bed,
ache@astral.msk.su : That any beholder /Might fancy me dead -
FidoNet: 2:5020/230.3 : Might start at beholding me, /Thinking me dead.
RELCOM Team,FreeBSD Team : E.A.Poe From "For Annie" 1849
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