strlen-like function for pointers? ptrlen?

[Nelson Castillo <nelsoneci@xxxxxxxxx>]

Hi there.

Is there a strlen-like function for pointers? I have this code:

struct ts_filter_api **api_r = api;
int count = 0;
/* find out how many filters we need to create */
while (*api_r) {
  count++;
  api_r++;
}

and I would like to have it replaced with

ptrlen(api);

If it doesn't exist -- do you see something that could go wrong with a
ptrlen function? Would upstream like it?

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