str_insert
(void) str_insert(r, 0, ")", 1);
(void) str_insert(r, 0, ")", 1);
(void) str_insert(l, 0, "id", 2);
(void) str_insert(s, pos, " const", 6);
(void) str_insert(s, pos, " volatile", 9);
(void) str_insert(s, pos, " restrict", 9);
(void) str_insert(TOP_L(db), 0, "~", 1);
(void) str_insert(TOP_L(db), 0, "::", 2);
boolean_t str_insert(str_t *, size_t, const char *, size_t);