13 Nov
2024
13 Nov
'24
9:02 p.m.
(I should point out that it is Julian half-days since Jan 1, 1977)
Johnny
On 2024-11-13 20:58, Johnny Billquist wrote:
Well. Bad design is not the same as "bug"
either. ;-)
I would suspect the author had some reason (good or bad) for defining it
the way it was.
I think extending it to unsigned 16 bits is a very straight forward and
obvious way to fix this.
But to be honest, I think the whole format is completely broken to begin
with. Either just specify it as seconds (or days) after some epoch, or
have separate fields for each component. Julian half-days? Who on earth
came up with that idea?
The formula is just horrific:
JULIAN =
(3055*(MONTH+2)/1OO-(MONTH+10)/13*2-91+(1-(YEAR-YEAR/4*4+3)/4)*(MONTH+10)/13+DAY-1+(YEAR-1977)*365+(YEAR-1977)/4)*2
Johnny
On 2024-11-13 20:20, Paul Koning wrote:
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt(a)softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
By "bug" I meant "specification
bug". The author of the DNA NetMan
spec messed up here. Yes, VMS faithfully follows that bad design.
The bugfix amounts to fixing the text of the spec, then changing the
implementations to match the corrected text. I don't know if the
former has ever been done but obviously a number of DECnet
implementations acted as if had been. :-)
paul
On Nov 13, 2024, at 1:53 PM, Johnny Billquist
<bqt(a)softjar.se> wrote:
I would not call it a bug. It was initially defined that way.
However,RSX officially decided to start treating it as an unsigned
16-bit value with the last releases, and documented this.
And it's a change that do make sense.
But if others have not applied the same update, then it makes sense
that they would zero the value if it have the high bit set.
Johnny
On 2024-11-13 19:26, Paul Koning wrote:
_______________________________________________
HECnet mailing list -- hecnet(a)lists.dfupdate.se
To unsubscribe send an email to hecnet-leave(a)lists.dfupdate.se The statement in the DECnet spec that julian
half-day is 15 bits is
an obvious bug with an obvious fix; clearly RSX and others have made
that fix. VMS needs to do likewise.
paul
> On Nov 13, 2024, at 12:50 PM, John Forecast <john(a)forecast.name
> <mailto:john@forecast.name>> wrote:
>
> Depends on the implementation. Nov 9, 2021 on VMS, Ultrix and
> probably some others. RSX is good until 2065.
>
> John.
>
>> On Nov 13, 2024, at 10:24 AM, Keith Halewood
>> <Keith.Halewood(a)pitbulluk.org
>> <mailto:Keith.Halewood@pitbulluk.org>> wrote:
>>
>> Hi,
>> It has been mentioned elsewhere and maybe a while back too but I’m
>> not quite sure when DECnet (VAX/VMS 7.3) started serving up jewels
>> like:
>> %%%%%%%%%%% OPCOM 13-NOV-2024 15:15:13.82 %%%%%%%%%%%
>> Message from user DECNET on TUPILE
>> DECnet event 4.10, circuit up
>> From node 29.109 (TUPILE), 1-JAN-1977 00:00:53.64
>> Circuit UNA-0
>> Regards
>> Keith
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--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt(a)softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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