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

  Converts the initial portion of the string pointed to by nptr to an
  unsigned long integer.

  Syntax:

       #include <stdlib.h>

       unsigned long int strtoul (const char *nptr, char **endptr,
                                  int base);