Re: [PATCH v5 4/8] perf headers: Store pmu caps in an array of strings

[Ravi Bangoria]

Hi Namhyung,

On 03-Jun-22 3:07 AM, Namhyung Kim wrote:
> On Tue, May 31, 2022 at 8:28 PM Ravi Bangoria <ravi.bangoria@xxxxxxx> wrote:
>>
>> Currently all capabilities are stored in a single string separated
>> by NULL character. Instead, store them in an array which makes
>> searching of capability easier.
>>
>> Signed-off-by: Ravi Bangoria <ravi.bangoria@xxxxxxx>
>> ---
> [SNIP]
>> @@ -3231,12 +3226,16 @@ static int process_per_cpu_pmu_caps(struct feat_fd *ff, int *nr_cpu_pmu_caps,
>>                 if (!value)
>>                         goto free_name;
>>
>> -               if (strbuf_addf(&sb, "%s=%s", name, value) < 0)
>> +               name_size = strlen(name);
>> +               value_size = strlen(value);
>> +               ptr = zalloc(sizeof(char) * (name_size + value_size + 2));
>> +               if (!ptr)
>>                         goto free_value;
>>
>> -               /* include a NULL character at the end */
>> -               if (strbuf_add(&sb, "", 1) < 0)
>> -                       goto free_value;
>> +               memcpy(ptr, name, name_size);
>> +               ptr[name_size] = '=';
>> +               memcpy(ptr + name_size + 1, value, value_size);
> 
> What about using asprintf() instead?

Yeah asprintf() would make that code bit simpler. I think I'll have to
respin the series :)

Thanks,
Ravi