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

  Converts strings of ASCII characters to the appropriate numeric
  values.  The ASCII string has the following form:

       [white-spaces][+|-]digits

  The function does not account for overflow resulting from the
  conversion.

  Syntax:

       #include <stdlib.h>

       long int atol(const char *nptr);