byte-count

    OpenVMS usage:longword_signed
    type:         longword integer (signed)
    access:       read only
    mechanism:    by value

    Byte count of the input ASCII text string. The byte-count
    argument is a signed longword integer containing the byte count
    of the input string.

 numeric-string

    OpenVMS usage:char_string
    type:         character string
    access:       read only
    mechanism:    by reference

    ASCII text string representation of a decimal, hexadecimal,
    or octal number that LIB$CVT_xTB_64 converts to binary
    representation. The numeric-string argument is the address of
    a character string containing this input string to be converted.

    LIB$CVT_xTB_64 allows only an optional plus (+) or minus (-) sign
    followed by a string of decimal, hexadecimal, or octal characters
    appropriate to the routine being called.

 result

    OpenVMS usage:quadword_signed
    type:         quadword integer (signed)
    access:       write only
    mechanism:    by reference

    Binary representation of the input string. The result argument is
    the address of a signed quadword integer containing the converted
    string.