Library /sys$common/syshlp/helplib.hlb  —  CRTL  strtoul  Return Values
    x                  The converted value.
    0                  Indicates that the string starts with an
                       unrecognized character or that the value for
                       base is invalid. If the string starts with
                       an unrecognized character, *endptr is set to
                       nptr.
    ULONG_MAX          Indicates that the converted value would cause
                       an overflow.
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