[Lldb-commits] [PATCH] Implement snprintf for MSVC with correct return value.

[Chaoren Lin]

https://msdn.microsoft.com/en-us/library/1kt27hek.aspx


> If buffer or format is NULL, or if count is less than or equal to zero,
> these functions invoke the invalid parameter handler, as described in Parameter
> Validation <https://msdn.microsoft.com/en-us/library/ksazx244.aspx>. If
> execution is allowed to continue, these functions return -1 *and set *
> *errno to EINVAL*.


On Wed, May 27, 2015 at 9:02 AM, Zachary Turner <zturner at google.com> wrote:

> I hadn't thought to write to /dev/null to get the length.  Good idea.  But
> why do you check for !errno?  The docs just say that if _vsnprintf fails it
> returns -1, it doesn't say anything about errno.
>
>
> http://reviews.llvm.org/D10048
>
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