[riot-notifications] [RIOT-OS/RIOT] sys/shell: add heap command (#10953)

Sebastian Meiling notifications at github.com
Tue Apr 16 08:11:41 CEST 2019

smlng requested changes on this pull request.

In general this is a good idea and edition to monitor mem usage, what I don't "like" about the implementation is code duplication for the `printf` and also the fact that the info is always printed.

I would recommend to rework/refine as follows:

- introduce a heap info struct holding the values, e.g.
typedef struct heap_info {
  unsigned size;
  unsigned free;
} heap_info_t;
- change `heap_stats` so it fills in that stuct, instead of printing it
- also change that function from `void` to `int` so you can indicate if heap stats are supported by this cpu, avoiding some of the `#ifdefs`
- use that new function in `sc_heap` to implement the `heap` command

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