On 14/01/2011 14:26, Jeff Morriss wrote:
> Graham Bloice wrote:
>> Any idea why the OSX compilers are complaining about this code in
>> packet-dnp.c:
>>
>> if (!header_only || al_objq_index > 0) {
>> start_offset = offset;
>> for (item_num = 0; item_num < num_items; item_num++)
>> {
>> /* Create Point item and Process Index */
>> if (AL_OBJQL_IDX_NI <= al_objq_index && al_objq_index <=
>> AL_OBJQL_IDX_4O) <---------- Error here
>
> [...]
>
>> The reported error is:
>>
>> packet-dnp.c: In function 'dnp3_al_process_object':
>> packet-dnp.c:1566: warning: comparison is always true due to limited range
>> of data type
>>
>> The variable (al_objq_index) is three bits so has a value between 0 and 7
>> and the constants are enumerations of the values. AL_OBJQL_IDX_NI is 0 and
>> AL_OBJQL_IDX_4O is 3. I suspect that the following if() might also error
>> out as it just checks for a different range of values (4-6).
>
> The problem is that al_objq_index is a guint8 and AL_OBJQL_IDX_NI is 0x0.
> Since an unsigned variable can't go negative, al_objq_index is ALWAYS
> greater than AL_OBJQL_IDX_NI (0).
>
> From quickly looking at the code, I'd guess that this comparison can simply
> be removed.
>
Thanks. I'll fix it up.
--
Regards,
Graham Bloice
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