webservices: allocate enough memory for WS_XML_TEXT_TYPE_DOUBLE (Valgrind) (try 2)

[Henri Verbeet]

On 14 December 2016 at 11:02, Hans Leidekker <hans at codeweavers.com> wrote:
> On Wed, 2016-12-14 at 10:20 +0100, Henri Verbeet wrote:
>> On 13 December 2016 at 20:17, Austin English <austinenglish at gmail.com> wrote:
>> > +        /* buf was originally [24], increased to 48 to prevent a stack smashing error when running tests under Valgrind */
>> > +        unsigned char buf[48]; /* "-1.1111111111111111E-308". */
>> The more interesting comment would perhaps be what actually happens
>> and why this helps.
>
> Valgrind doesn't really support 80-bit floating point arithmetic:
> http://www.valgrind.org/docs/manual/manual-core.html#manual-core.limits
>
That mentions limitations wrt. precision, rounding and fp exceptions,
but from that page it's not obvious to me how that results in the
mentioned stack corruption.