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Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message
From: |
Markus Armbruster |
Subject: |
Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter |
Date: |
Mon, 21 Jul 2014 19:33:14 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) |
John Snow <address@hidden> writes:
> On 07/21/2014 03:48 AM, Markus Armbruster wrote:
>>
>> It certainly could check whether the value fits into uint64_t.
>>
>> A quick peek at how string-input-visitor.c uses strtoll() makes me
>> cringe.
>>
>> [...]
>
> What I meant by that was to say that by the time a value was returned
> to visit_type_uint64, the value has already been possibly converted
> implicitly from a negative value, and we can't tell at this level if
> that happened without re-inspecting the string we were passed. At that
> point, why not just fix the string parsing mechanics one more layer
> down in parse_type_int() -- or by creating another routine primitive;
> i.e parse_type_uint.
>
> As Eric Blake noted elsewhere in the thread, it would be nice to have
> the ability to have three behaviors at the lowest level -- signed,
> unsigned with wraparound, and unsigned strict. The biggest question in
> my mind is how to add the property flag to allow authors to opt-in to
> the unsigned with wraparound option, where the unsigned strict option
> makes the most sense to me as a default.
Do we have a use case for silently mapping negative numbers to positive
ones?
> For now I will just fix the error message. We can draft ideas for how
> to fix the semantic issues in parsing later.
Yes, that makes sense.
- Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter, (continued)
- Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter, Amit Shah, 2014/07/18
- Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter, Markus Armbruster, 2014/07/18
- Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter, Amit Shah, 2014/07/18
- Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter, Markus Armbruster, 2014/07/18
- Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter, John Snow, 2014/07/18
- Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter, Markus Armbruster, 2014/07/21
- Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter, John Snow, 2014/07/18
- Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter, Eric Blake, 2014/07/18
- Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter, Markus Armbruster, 2014/07/21
- Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter, John Snow, 2014/07/21
- Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter,
Markus Armbruster <=
- Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter, John Snow, 2014/07/21
- Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter, Markus Armbruster, 2014/07/21
- Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter, John Snow, 2014/07/21
- Re: [Qemu-devel] [PATCH v2] virtio-rng: Add human-readable error message for negative max-bytes parameter, Eric Blake, 2014/07/21