/sys$common/syshlp/HELPLIB.HLB  —  CRTL  atof  Return Values
    x                  The converted value.
    0                  Indicates an underflow or the conversion could
                       not be performed. The function sets errno to
                       ERANGE or EINVAL, respectively.
    HUGE_VAL           Overflow occurred; errno is set to ERANGE.
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