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Re: [Xen-devel] [PATCH] xen/cmdline: Fix buggy strncmp(s, LITERAL, ss - s) construct
- To: Jan Beulich <JBeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 4 Jan 2019 16:25:16 +0000
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- Cc: Julien Grall <julien.grall@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
- Delivery-date: Fri, 04 Jan 2019 16:25:57 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 04/01/2019 15:55, Andrew Cooper wrote:
> On 04/01/2019 15:32, Jan Beulich wrote:
>>> + {
>>> + int res = (*frag - *name);
>> With the result of this being implementation defined (due to plain
>> char's implementation defined - often command line controlled
>> with an implementation defined default - signedness) I wonder if
>> this function can really usefully return "int" rather than "bool".
> My CPUID command line parsing needs this to work properly as int, for
> bisecting across a sorted list.
>
> I'll add an explicit cast to signed char. I'll also fix out local libc
> functions, which are similarly buggy.
And by this, I actually mean an explicit unsigned cast, having just
cross-checked with the C spec.
~Andrew
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