To Erich Waelde.
I wrote :
> I think I see a bug in your AmForth v4.9.
You wrote :
> > ver
> amforth 4.6 ATmega328P ok
> > 9 0 10 within .
> -1 ok
> > 10 0 10 within .
> -1 ok
But 4.9 is not 4.6.
And 4.6 is not 4.9.
I do not have AmForth v4.6, but sure that WITHIN word was changed
during transition 4.6 -> 4.9.
Look.
At 4.9 in file ..\core\words\within.asm we now see
; : within >r over > swap r> > or 0= ;
; alternativly
; : within over - >r - r> u< ;
But this are TWO NOT EQUIVALENT definitions of WITHIN !!!
If think in 4.6 it was
: within >r over > swap r> > or 0= ;
and it is NOT according to ANSI standart.
At 4.9 we have
: within over - >r - r> u< ;
and this is ACCORDING to ANSI standart.
What is the difference ?
Look at this :
: WITHIN >R OVER > SWAP R> > OR 0= ;
WITHIN redefined
Ok
9 0 10 WITHIN .
-1 Ok
10 0 10 WITHIN .
-1 Ok <- WRONG !!!
: WITHIN OVER - >R - R> U< ;
WITHIN redefined
Ok
9 0 10 WITHIN .
-1 Ok
10 0 10 WITHIN .
0 Ok <- RIGHT !!!
I think the definition of WITHIN was changed on transition from
4.6 to 4.9, but the definition of TOLOWER was not changed accordingly.
And this is the source of both : a bug and an our misunderstanding.
Arthur Ivanov
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