slist_qsort0
slist_qsort0(list, compar, 0, slist_length(list) - 1);
slist_qsort0(list, compar, l, j);
slist_qsort0(list, compar, i, r);
static __inline void slist_qsort0(slist *, int (*)(const void *, const void *), int, int);