heim_alloc
heim_alloc(size_t size, const char *name, heim_type_dealloc dealloc);
ptr = heim_alloc(10, "memory", memory_free);
ptr = heim_alloc(10, "memory", NULL);
p = heim_alloc(sizeof(*p), "krb5-plugin", plug_dealloc);
pl = heim_alloc(sizeof(*pl), "struct-plug", plug_free);