From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <3df2441e04d6927e27b52beac75e8c97@9netics.com>
To: quanstro@quanstro.net, 9fans@9fans.net
Date: Fri, 12 Feb 2016 09:44:59 -0800
From: Skip Tavakkolian <9nut@9netics.com>
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Subject: Re: [9fans] BCD encoding in Plan9 - don't shoot me
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if i understand it correctly (reading wikipedia's description) the
field is either packed BCD (each nibble is the binary representation
of the digit) or ebcdic representation of the digits (see /sys/src/cmd/dd.c:618)

> So, I'm working with ISO8583,  a "standard" (HAHAHAH!!!!!)  The "standard"
> allows  but does not require, BCD encoding of numerical data. Which may or
> may not have a BCD-encoded numerical length prefix. The prefix may or may
> not be 1 to 3 bytes in length. Or the data might come with no prefix, and
> be right justified in a fixed width field of known size. Or left justified.
> So hard to tell these days.
>
> But I ramble. So I was just wanting to ask if anyone here has any simple
> BCD conversion routines.
>
> But, actually, ignore the subject line. Just shoot me.

/sys/src/9/pc/devrtc.c has an example of simple conversions, but given that standard,
i suppose simple is not what you're after.

- erik