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

  Converts a wide character string, in a given base, to a long
  integer value.

  Syntax:

       #include <wchar.h>

       long int wcstol (const wchar_t *nptr, wchar_t **endptr, int
       base);