Stefan Beller <sbel...@google.com> writes:
> This was missed in 5982da9d2ce (replace-object: allow
> prepare_replace_object to handle arbitrary repositories, 2018-04-11)
>
> Technically the code works correctly as the replace_map is the same
> size in different repositories, however it is hard to read. So convert
> the code to the familiar pattern of dereferencing the pointer that we
> assign in the sizeof itself.
;-)
We say
ptr = xmalloc(sizeof(*ptr))
is better because
ptr = xmalloc(sizeof(typeof(*ptr)))
is easy to go stale unless we actually use typeof and instead say a
concrete type like "struct oidmap".
This one was doing
ptr = xmalloc(sizeof(*another_ptr))
and it was OK because ptr and another_ptr happened to be of the same
type. I wonder if we are making it safer, or making it more obscure
to seasoned C programmers, if we introduced a pair of helper macros,
perhaps like these:
#define ALLOCATE(ptr) (ptr) = xmalloc(sizeof(*(ptr)))
#define CALLOCATE(ptr,cnt) (ptr) = xcalloc((cnt), sizeof(*(ptr)))
The change looks obviously good. Will queue.
Thanks.
