VMS Help CC, Run-time functions, qsort  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Sorts an array of objects in place.  It implements the quick-sort
  algorithm.

  Syntax:

       #include <stdlib.h>

       void qsort (void *base, size_t nmemb, size_t size,
                   int (*compar) (const void *, const void *));