Gforth BLOCK 0

Hi,

I'm relatively new to Forth and I'm wondering if I'm doing something wrong or if this is intended behavior or if this is a bug. I'm using gforth on GNU/Linux.

Executing the following gives me an error message and creates an empty 0 byte file called blocks.fb:

s" Hello world!" 0 block place update save-buffers bye

I have attached the backtrace but it doesn't seem very helpful, all it says is invalid memory address. So I then delete the file blocks.fb and try again, but this time with block 1 instead:

s" Hello world!" 1 block place update save-buffers bye

and it successfully writes into the block and we can verify that it did indeed write into it by starting gforth again and executing:

1 block count type Hello world! ok

So maybe block 0 will work now? I try to write into it again:

s" weird..." 0 block place update save-buffers bye

No errors this time, but when I start gforth again and try to read from it I don't get the expected output:

0 block count type ok

So I looked at the blocks.fb file in a text editor and "weird..." was written into it correctly and after a while I've figured that the following works after starting gforth again:

1 block drop 0 block count type weird... ok

To me this seems like a bug where "0 block" doesn't initialize something that "1 block" does. Either that or I'm using blocks the wrong way. Unfortunately I could not find any simple examples on how to use blocks so I'm just going off the docs and a few scraps of information on the internet that I could find.

Best Regards,
shtps

Gforth 0.7.3, Copyright (C) 1995-2008 Free Software Foundation, Inc.
Gforth comes with ABSOLUTELY NO WARRANTY; for details type `license'
Type `bye' to exit
s" Hello world!" 0 block place update save-buffers bye 
:1: Invalid memory address
s" Hello world!" 0 block place update >>>save-buffers<<< bye
Backtrace:
$7F4E85B882F0 throw 
$7F4E866DCB88 
$7F4E866E1A00 
$7F4E866D8000 
$7F4E866D2FD0 
$7F4E85B882A0 
$7F4E85B885C0 open-blocks 
$7F4E85B886A0 get-block-fid 
$7F4E85B887C8 block-position 
$5594FF160570 
$7F4E85B88998 save-buffer 
$0 
$20