From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <ee9e417a0601141022g720dd846q6e1148d6100c95b6@mail.gmail.com>
Date: Sat, 14 Jan 2006 13:22:57 -0500
From: Russ Cox <rsc@swtch.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] tarfs & 2GB limit
In-Reply-To: <20060114121550.4FD0134FFB@dexter-peak.quanstro.net>
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> one question, with tpfs, there's a cast to vlong:
>         seek(tapefile, 512*(vlong)r->data+off, 0);
> i cast to (int) because the size is only 3 bytes.
> is there anything drasticlly wrong with this?

the cast is there not because r->data is big,
but so that multiplying by 512 and adding
off doesn't overflow.