stringpool_strn2id
Id id = stringpool_strn2id(&pool->ss, str, len, create);
id = stringpool_strn2id(&data->spool, str, l, 1);
id = stringpool_strn2id(&data->spool, dir, dire - dir, create);
return stringpool_strn2id(ss, str, (unsigned int)strlen(str), create);
Id stringpool_strn2id(Stringpool *ss, const char *str, unsigned int len, int create);