From mboxrd@z Thu Jan  1 00:00:00 1970
MIME-Version: 1.0
In-Reply-To: <CAPd04b7R0OekF3cfRomf9FDBC8BPAWKcvkXFdia4nc6MM5ZV=w@mail.gmail.com>
References: <CAPv5z_1K8M+R84f+athA9C77MUSSQnk=Z9idQ8y=6j4K1XdDWA@mail.gmail.com>
	<CAPd04b7R0OekF3cfRomf9FDBC8BPAWKcvkXFdia4nc6MM5ZV=w@mail.gmail.com>
From: Costin Chirvasuta <costinc@gmail.com>
Date: Fri, 12 Aug 2016 18:29:47 +0300
Message-ID: <CAPv5z_0RUfRBszV07h0vzxA_YrUYV+_KMgwXfJEQTbdMJUBBrA@mail.gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Content-Type: text/plain; charset=UTF-8
Subject: Re: [9fans] bufreset deletes b->nbl-1 blocks?
Topicbox-Message-UUID: 971342cc-ead9-11e9-9d60-3106f5b1d025

> So isn't the memmove just to cover the case where you are
> deleting a block that isn't at the very end?

Yes, but from what I understand i is always lower.

Say b->nbl starts at 10. i=b->nbl-1 so i=9. --i so i=8.
Inside delblock b->nbl-- so b->nbl is 9. i<nbl is true so the memmove happens.

Also delblock(b, 0) never seems to happen.

On Fri, Aug 12, 2016 at 6:20 PM, James A. Robinson
<jim.robinson@gmail.com> wrote:
> But delblock only calls memmove if i is less then b->nbl, which was
> just decremented, correct?
>
> So isn't the memmove just to cover the case where you are
> deleting a block that isn't at the very end?
>
> Jim
>