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64 lines
2.4 KiB
Plaintext
64 lines
2.4 KiB
Plaintext
=head1 NAME
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basecvt - radix conversion for arbitrary precision integers
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=head1 SYNOPSIS
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basecvt <ibase> <obase> [values]
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=head1 DESCRIPTION
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The B<basecvt> program is a command-line tool for converting integers
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of arbitrary precision from one radix to another. The current version
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supports radix values from 2 (binary) to 64, inclusive. The first two
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command line arguments specify the input and output radix, in base 10.
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Any further arguments are taken to be integers notated in the input
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radix, and these are converted to the output radix. The output is
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written, one integer per line, to standard output.
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When reading integers, only digits considered "valid" for the input
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radix are considered. Processing of an integer terminates when an
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invalid input digit is encountered. So, for example, if you set the
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input radix to 10 and enter '10ACF', B<basecvt> would assume that you
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had entered '10' and ignore the rest of the string.
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If no values are provided, no output is written, but the program
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simply terminates with a zero exit status. Error diagnostics are
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written to standard error in the event of out-of-range radix
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specifications. Regardless of the actual values of the input and
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output radix, the radix arguments are taken to be in base 10 (decimal)
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notation.
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=head1 DIGITS
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For radices from 2-10, standard ASCII decimal digits 0-9 are used for
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both input and output. For radices from 11-36, the ASCII letters A-Z
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are also included, following the convention used in hexadecimal. In
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this range, input is accepted in either upper or lower case, although
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on output only lower-case letters are used.
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For radices from 37-62, the output includes both upper- and lower-case
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ASCII letters, and case matters. In this range, case is distinguished
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both for input and for output values.
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For radices 63 and 64, the characters '+' (plus) and '/' (forward
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solidus) are also used. These are derived from the MIME base64
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encoding scheme. The overall encoding is not the same as base64,
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because the ASCII digits are used for the bottom of the range, and the
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letters are shifted upward; however, the output will consist of the
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same character set.
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This input and output behaviour is inherited from the MPI library used
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by B<basecvt>, and so is not configurable at runtime.
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=head1 SEE ALSO
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dec2hex(1), hex2dec(1)
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=head1 AUTHOR
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Michael J. Fromberger <sting@linguist.dartmouth.edu>
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Thayer School of Engineering, Hanover, New Hampshire, USA
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$Date: 2000/07/14 00:44:31 $
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