[pypy-dev] [pypy-svn] r45269 - in pypy/dist/pypy/rpython/module: . tes
tismer at stackless.com
Tue Jul 24 21:18:48 CEST 2007
On 24.07.2007, at 18:08, Armin Rigo wrote:
> Hi Fijal,
> On Mon, Jul 23, 2007 at 02:38:32PM +0200, Maciek Fijalkowski wrote:
>> The length of the arrays in a struct utsname is
>> unspecified; the
>> are terminated by a null byte (?????? ???).
>> I'm completely confused.
> It means that the structure looks like this in lltype notation:
> Struct('utsname', ('text1', FixedSizeArray(Char, 10)),
> ('text2', FixedSizeArray(Char, 20)),
> where, annoyingly, the numbers '10' and '20' are platform-dependent
> must be obtained by trying to compile snippets of C code using
> and offsetof().
> Or are you confused about the bit saying that the fields are
> zero-terminated? It just means that in the array, characters 0 to N-1
> are non-null, charater N is null, and the rest of the characters are
Which reminds us to implement this carefully and not to rely on the
terminating byte, or we will open the door to buffer overflow
ciao - chris
Christian Tismer :^) <mailto:tismer at stackless.com>
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