Re: [Jbeta] 3!:1 and 3!:3 What are these zeros?

[Roger Hui]

In 3!:n the value part of one-byte types is indeed
terminated with an extra 0 byte, and then rounded
up to the next mword.

For your particular example, try looking at the
parts as well as the whole:

3!:3 'test'
3!:3 'abcd'
3!:3 'test';'abcd'



----- Original Message -----
From: Gilles Kirouac <[EMAIL PROTECTED]>
Date: Monday, August 14, 2006 8:11 am
Subject: Re: [Jbeta] 3!:1 and 3!:3 What are these zeros?

> I guess it has to be the need for a NUL terminating a c-string.
> 
> But now what is the 38 in the following:
> 
>      hexdump 3!:1 (<'test'),<'abcd'
> 00  E1 00 00 00-20 00 00 00  02 00 00 00-01 00 00 00  &#9474;... 
> ......
...&#9474;10  02 00 00 00-1C 00 00 00  38 00 00 00-E1 00 
> 00 00  &#9474;......8......&#9474;
> 20  02 00 00 00-04 00 00 00  01 00 00 00-04 00 00 00  
> &#9474;......
......&#9474;30  74 65 73 74-00 00 00 00  E1 00 
> 00 00-02 00 00 00  &#9474;test..........&#9474;
> 40  04 00 00 00-01 00 00 00  04 00 00 00-61 62 63 64  
> &#9474;...
......abcd&#9474;50  00 00 00 00                      
>                 &#9474;....            &#9474;
> 
> I am trying to use the Simple Socket Server class from a non-J 
> environment. Since this class rests on 3!:1 and it is preferable 
> to use it as it is, I need to emulate 3!:1. Having a model in J 
> would help.
> 
> The Simple Socket Client/Server classes and the related lab 
> are clear and simple. Thanks, Eric!
> 
> Gilles
> 
> ---------- Original Message -----------
> From: "Gilles Kirouac" <[EMAIL PROTECTED]>
> To: Beta forum <beta@jsoftware.com>
> Sent: Mon, 14 Aug 2006 02:08:17 -0400
> Subject: [Jbeta] 3!:1 and 3!:3 What are these zeros?
> 
> > Are the terminating zeros padding? 
> > When are four zeros added?
> > The terminating byte should be a zero 
> > padded to the full word: is this the rule?
> > I do not see those zeros mentioned in the doc.
> > 
> >       3!:3 '123'
> > e1000000
> > 02000000
> > 03000000
> > 01000000
> > 03000000
> > 31323300
> >       3!:3 '1234'
> > e1000000
> > 02000000
> > 04000000
> > 01000000
> > 04000000
> > 31323334
> > 00000000
> >       3!:3 '12345'
> > e1000000
> > 02000000
> > 05000000
> > 01000000
> > 05000000
> > 31323334
> > 35000000
> >       3!:3 '12345678'
> > e1000000
> > 02000000
> > 08000000
> > 01000000
> > 08000000
> > 31323334
> > 35363738
> > 00000000


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