TDD program for Linux

T. Joseph CARTER knghtbrd at
Tue Nov 22 05:44:57 UTC 2005

Janina Sajka wrote:
> But don't many TDD devices require that users make this change by hand?
> If it were automatic, this might be a great alternative.

It's okay, the BAUDOT thing is easy enough to do.  The only part of the
code that is a little weird from the ASCII point of view is the bit code
11x11.  Based on the middle bit, you set either letters or figures mode.

In C (non-programmers, that's your cue to stop reading), code to turn
baudot into ASCII might look like this:


static int baudot_mode;		/* Must be 0 or 1 */

static const char bd_ascii[][] = {
	"\05\r9 #,.\n)4&80:;3\"$?\a6!/-2'\xfe71(\xff"

#define bd_ascii(x) (bd_ascii[x][baudot_mode])

Of course, if you pass \x1B or \x1F to bd_ascii, it will return -2 or -1
respectively, which tells you want to set baudot_mode to.  Going the other
direction is harder because we're talking about going from a code with 128
values down to a code with 56 values.  Obviously lowercase characters can
be turned into uppercase ones, but that leaves a whole lot of control
characters and punctuation that must be converted or dropped.  This is not
extraordinarily difficult, but if I were to take the time to do it, I
would actually be doing it in a bit of source code rather than in some
email.  *smile*

"We are what we repeatedly do.  Excellence, therefore, is not an act,
but a habit."
	-- Aristotle

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