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Forums > C64 Coding > 64tass C-like escape sequences (ie '\xff')

2017-01-16 15:22

Compyx

Registered: Jan 2005
Posts: 631

64tass C-like escape sequences (ie '\xff')

After trying a few things and failing (using the latest SVN 64tass) to get C-like escape sequences to work, such as \xff (insert a $ff byte) inside .text or .byte blocks and checking the manual, I might as well ask here.

Is this at all supported? It seems like it isn't. I'm working on some simple editor that uses $f0-$ff inside a string of text to change the text color.

Right now I have:

.text $f1, "hello ", $f7, "world", 0

Which works fine, but makes using these color codes quite annoying, I'd prefer:

.text "\xf1hello \xf7world", 0

I know I can use .edef statements to construct my own encoding, but that seems a bit like overkill.

Any 64tass users out here who can help me?

-- Compyx

2017-01-16 17:00

Oswald

Registered: Apr 2002
Posts: 5017

soci usually hangs around and will fill you in soon.

2017-01-16 17:21

Compyx

Registered: Jan 2005
Posts: 631

I know, that's why I asked here ;)

2017-01-16 18:41

soci

Registered: Sep 2003
Posts: 473

No specific escaping style is enforced and "{cr}" and friends are only included as a convenience in the default encoding.

The only real escaping what's there is for entering the string ending quotes as a character which need to be duplicated to be not recognized as string ending.

Therefore you need to define what you needed, like this:

.for i = 0, i < 256, i += 1
.edef format("\x%02x", i), i
.next

Then you can use them as expected:

>1000	f1 48 45 4c 4c 4f 20 f7		.null "\xf1hello \xf7world"
>1008	57 4f 52 4c 44 00

You may adjust the loop to only generate a subset or add '.edef "\r", 13' and others. Creating a new encoding definition from scratch is not needed, it's fine just to add them to the default.

Older versions need "i = i + 1" instead of "i += 1", but I think you're on trunk so I wrote it accordingly ;)

2017-01-16 19:15

Compyx

Registered: Jan 2005
Posts: 631

Alright, thanks, that will work.

Didn't know I could loop over these .edef statements, In that case it's real easy.

And yes, I use trunk, so `i += 1` works fine, thanks for adding that, the old `i = i + 1` looked very BASIC-ish.
Of course `i++` would be even more hard core :)

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