str_init
str_init(s, ops);
str_init(&num, db->cpp_ops);
str_init(&sl, n->nm_ops);
str_init(&sr, n->nm_ops);
(void) str_init(&res, n->nm_ops);
str_init(&sp->strp_l, ops);
str_init(&sp->strp_r, ops);
str_init(&sp->strp_r, sp->strp_l.str_ops);
str_init(dest, src->str_ops);
void str_init(str_t *restrict, sysdem_ops_t *);