The Convert Binary Text to Unsigned Integer routine converts an
    ASCII text string representation of an unsigned binary value to
    an unsigned integer value. The integer value can be of arbitrary
    length but is typically a byte, word, longword, or quadword. The
    default size of the result is a longword.

    Format

      OTS$CVT_TB_L  fixed-or-dynamic-input-string

                    ,varying-output-value [,output-value-size]

                    [,flags-value]

1  –  Returns

    OpenVMS usage:cond_value
    type:         longword (unsigned)
    access:       write only
    mechanism:    by value

2  –  Arguments

 fixed-or-dynamic-input-string

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

    Input string containing the string representation of an unsigned
    binary value that OTS$CVT_TB_L converts to an unsigned integer
    value. The fixed-or-dynamic-input-string argument is the
    address of a descriptor pointing to the input string. The valid
    input characters are blanks and the digits 0 and 1. No sign is
    permitted.

 varying-output-value

    OpenVMS usage:varying_arg
    type:         unspecified
    access:       write only
    mechanism:    by reference

    Unsigned integer of specified size that OTS$CVT_TB_L creates
    when it converts the ASCII text string. The varying-output-value
    argument is the address of the integer. The value of the output-
    value-size argument determines the size in bytes of the output
    value.

 output-value-size

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

    Arbitrary number of bytes to be occupied by the unsigned integer
    output value. The output-value-size argument contains a value
    that equals the size in bytes of the output value. If the value
    of output-value-size is zero or a negative number, OTS$CVT_TB_L
    returns an input conversion error. If you omit the output-value-
    size argument, the default is 4 (longword).

 flags-value

    OpenVMS usage:mask_longword
    type:         longword (unsigned)
    access:       read only
    mechanism:    by value

    User-supplied flag that OTS$CVT_TB_L uses to determine how
    to interpret blanks within the input string. The flags-value
    argument contains this user-supplied flag.

    OTS$CVT_TB_L defines the flag as follows:

    Bit  Action if Set    Action if Clear

    0    Ignore blanks.   Interpret blanks as zeros.

    If you omit the flags-value argument, OTS$CVT_TB_L defaults all
    flags to clear.