str reps

str_rep.c

add_str_rep (const char *typestr, const char *rep (void *obj)) {
   LIST_INSERT..(&str_reps, {typestr, rep});
}

const char *to_str (const char *typestr, void *obj) {
   str_rep = LIST_FIND(&str_reps, trim_stuff(typestr); /* remove "const", "*", etc.. */));
   if (!str_rep)
      return rsprintf("(%s)%p", typestr, obj);
   else
      return str_rep.callback(obj);
}

#define STR(OBJ)  to_str(# typeof(OBJ), OBJ)


int main (void) {
   struct iovec iov;
   const my_type_t hehe[19];
   int foo;
   
   add_str_rep("struct iovec", func (obj) { struct iovec *p = obj; return tsprintf("iov_base=%p, iov_len=%d", p->iov_base, p->iov_len) });
   ...
   printf("%s: %s, %s\n", STR(&foo), STR(&iov), STR(&hehe[2]));
}