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Date: Sat, 29 Jun 2013 23:38:09 +1000
From: Matthew Fernandez <>
To: <>
CC: Rich Felker <>
Subject: Re: Use of size_t and ssize_t in mseek

On 29/06/13 14:13, Rich Felker wrote:
> If size_t is 64-bit, there is fundamentally no way a memory buffer (or
> disk file) larger than SSIZE_MAX can be accessed, since off_t cannot
> store the position in the file. I noticed this as soon as I went to
> write:
>       case SEEK_SET:
>               if (off < 0 || off > c->size) goto fail;
> I could still salvage the 32-bit case by simply leaving the code alone
> except for changing base to off_t, but I'm starting to remember why I
> thought it was bogus to even consider allowing object sizes greater
> than the signed size max...
> Not sure what the best way to proceed is.

I still don't see the barrier to introducing a check for size greater
than SSIZE_MAX in fmemopen and leaving mseek as is. Am I missing something?


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