ref: 4fb339ca7d208f3ccc55af2c71b7149adfa1d697
dir: /qp.h/
typedef union Trie Trie; #pragma incomplete Trie int qpget(Trie *t, char *k, int len, char **pk, char **pv); int qpnext(Trie *t, char **pk, int *plen, void **pv); Trie *qpset(Trie *t, char *k, int len, void *v);