Make custom memory allocation/deallocation equivalent to malloc/free

[Siddharth]

I have a custom free function "custom_free" that deallocates memory allocated by malloc or by a custom alloc function "custom_alloc".
When i run cppcheck, it reports "mismatchAllocDealloc" whenever it finds something like this

str = malloc(100);
custom_free(str); / Valid - custom_free internally calls free . Still cppcheck generates mismatchAllocDealloc /

Is there a way to define in the ".cfg" to indicate free and custom_free are equivalent ?

I tried this
<memory>
<alloc>malloc</alloc>
<dealloc>free</dealloc>
<dealloc>custom_free</dealloc>
</memory>

This works , but then it applies this rule for all paramters to custom_free whereas i want the rule to be applied only for the 3rd parameter. Thats because rest of the parameters are not deallocated by this custom_free function.

So tried this -

<memory>
<alloc>malloc</alloc>
<dealloc>free</dealloc>
<dealloc arg="3">custom_free</dealloc>
</memory>

But this doesn't work and it generates mismatchAllocDealloc.

Please note, I do not want to suppress mismatchAllocDealloc considering it may suppress genuine issues.

Thanks
Siddharth

[versat]

Slightly related thread: https://sourceforge.net/p/cppcheck/discussion/general/thread/d9737d5d/
While it seems possible to specify arg options for alloc and dealloc, Cppcheck does not seem to take these into account.
@danmar Should we create a special ticket for such issues, requesting arg options to work? I have not found any ticket that already handles it directly.

[Daniel Marjamäki]

Should we create a special ticket for such issues, requesting arg options to work? I have not found any ticket that already handles it directly

sounds ok to me.