December 2022 - Oberon - mailman3.inf.ethz.ch

http://cas.inf.ethz.ch/projects/a2
by peter＠easthope.ca 14 Feb '23

14 Feb '23

Hi, For more than 24 hours, access to http://cas.inf.ethz.ch and to http://cas.inf.ethz.ch/projects/a2 has failed. Do others observe the same? Thx, ... P.L. mobile: +1 778 951 5147 VoIP: +1 604 670 0140 https://en.wikibooks.org/wiki/User:PeterEasthope

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OberonErrors.Text.
by peter＠easthope.ca 11 Jan '23

11 Jan '23

Hello again, In the tutorial for the compiler in ETH Oberon, Andre mentioned OberonErrors.Text. https://en.wikibooks.org/wiki/Oberon/ETH_Oberon/Tutorial/Compiler#Debugging… The only list of errors I've found in ETHO 2.3.7 is in Oberon.Text. The best explanation I imagine is that OberonErrors.Text existed before the list was incorporated into Oberon.Text. Ideas? Thx, P.L. mobile: +1 778 951 5147 VoIP: +1 604 670 0140 https://en.wikibooks.org/wiki/User:PeterEasthope

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I wrote an article on 2 Wirthian languages that might entertain folks here
by Liam Proven 29 Dec '22

29 Dec '22

GCC 13 to support Modula-2: Follow-up to Pascal lives on in FOSS form https://www.theregister.com/2022/12/16/gcc_13_will_support_modula2/ Niklaus Wirth's lesser known programming language still kicking around -- Liam Proven ~ Profile: https://about.me/liamproven Email: lproven(a)cix.co.uk ~ gMail/gTalk/FB: lproven(a)gmail.com Twitter/LinkedIn: lproven ~ Skype: liamproven UK: (+44) 7939-087884 ~ Czech [+ WhatsApp/Telegram/Signal]: (+420) 702-829-053

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Meaningfulness of a name.
by peter＠easthope.ca 28 Dec '22

28 Dec '22

Greetings for the New Year, Another aspect of a name is meaning. Is an admonition or maxim, in effect "choose meanful names", published somewhere? Preferably published by Prof. Wirth or another recognized authority. At present I don't find anything really appropriate. Thx, ... P.L. mobile: +1 778 951 5147 VoIP: +1 604 670 0140 https://en.wikibooks.org/wiki/User:PeterEasthope

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Re (2): ETH Oberon: file names.
by peter＠easthope.ca 21 Dec '22

21 Dec '22

From: Hellwig Geisse <hellwig.geisse(a)mni.thm.de> Date: Wed, 21 Dec 2022 22:19:30 +0100 > I just tried 'touch 1234567890' with different lengths of > the filename (Ubuntu 16.04 LTS). Lengths up to and including > 255 are working well, 256 and up terminate with the error > message 'File name too long'. Thanks. I didn't test the claim. Also interesting that ETHO Edit accepts file names 27 characters and less. Attempting to store a file with name longer than 31 characters yields an "invalid name" message. An intermediate length, 28-31 characters yields a trap. An error message would be better. Thx, ... P. mobile: +1 778 951 5147 VoIP: +1 604 670 0140 https://en.wikibooks.org/wiki/User:PeterEasthope

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ETH Oberon: file names.
by peter＠easthope.ca 21 Dec '22

21 Dec '22

>From Hans Klaver hklaver at dds.nl, Fri Dec 9 15:56:18 CET 2022 > I guess the restriction within Oberon (the language) and within > Oberon Systems is more a matter of readability (and then ultimately of > taste and style). I found that security is also a consideration. Added a few sentences with a link. https://en.wikibooks.org/wiki/Oberon/Naming/Files%2C_Servers_and_Viewers > On the other hand, for interfacing with other operating systems > exceptions can be made, even by ETH folks. OFS allows for longer file names. CONST ... PreLength = 16; LocalLength = 128; At least one Web page claims that current Linux systems allow file names up to 255 characters. Further input always welcome. Thx, ... P.L. mobile: +1 778 951 5147 VoIP: +1 604 670 0140 https://en.wikibooks.org/wiki/User:PeterEasthope

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Correction: Re: ETH Oberon: file names.
by peter＠easthope.ca 21 Dec '22

21 Dec '22

https://en.wikibooks.org/wiki/Oberon/Naming/Files%2C_Servers_and_Viewers should be https://en.wikibooks.org/wiki/Oberon/Naming#Files%2C_Servers_and_Viewers Sorry for the complication, ... P. mobile: +1 778 951 5147 VoIP: +1 604 670 0140 https://en.wikibooks.org/wiki/User:PeterEasthope

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Re: [Oberon] Email and file names in ETH Oberon.
by peter＠easthope.ca 21 Dec '22

21 Dec '22

From: peter(a)easthope.ca Date: Mon, 19 Dec 2022 18:48:37 -0800 > Mail.UIDLFile creates a file name such as > "UIDL.172.23.5.1.peterXeasthope.ca". > > That's 33 characters. Mail.UIDLFile attempts to open or create a file > with that name but fails with any name longer than 27 characters. Ie. > name + .Bak + 0x is limited to 32 characters. What limits length of a file name? OFS declares. CONST ... LocalLength = 128; OFSAosFiles restricts further. CONST ... FnLength = 32; (* includes 0X *) For programming instruction in 1990 I imagine that limit sufficed. Originally, a mail user id might have not included a domain name. So a hypothetical file name in Mail would have been UIDL.172.23.5.1.peter rather UIDL.172.23.5.1.peterXeasthope.ca. So the 32 character limit worked for Mail. =8~) Now for many current mail user identities the attempted file name fails. =8~( Expedient solution: change OFSAosFiles to allow a longer file name. CONST ... FnLength = 40; Tolerable? Objectionable? More sophisticated solution: store the mail service information elsewhere from the file name. Hypothetical possibility. Current Mail File name UIDL.172.23.5.1.peterXeasthope.ca containing this line. UID16252-1329772258UID77894-1329772258UID98661-1329772258 And file name UIDL.172.23.6.1.joXdoe.ca containing this line. UID25216-2258132977UID89477-2258132977 etc. Additional detail: in some cultures a human name can begin with X. Replacement of @ with X can yield a failure. =8~/ Hypothetical Simplification File name UIDL containing these lines. 172.23.5.1.peter@easthope.caUID16252-1329772258UID77894-1329772258UID98661-1329772258 172.23.6.1.jo(a)doe.caUID25216-2258132977UID89477-2258132977 etc. Additional detail: replacement of @ with X is abolished. =8~) At least I should avoid documenting a broken MUA. =8~) Thanks, ... P.L. mobile: +1 778 951 5147 VoIP: +1 604 670 0140 https://en.wikibooks.org/wiki/User:PeterEasthope

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Email and file names in ETH Oberon.
by peter＠easthope.ca 20 Dec '22

20 Dec '22

From: Joerg <joerg.straube(a)iaeth.ch> Date: Sun, 18 Dec 2022 22:39:50 +0100 > You could write an email server for both protocols using the same > UID coding, namely a 32bit number For now I just want to be sure Mail works in ETH Oberon. For my mail server, "peter(a)easthope.ca" is a user. Mail replaces @ with X to have a valid file name as discussed a few days back. (https://en.m.wikibooks.org/wiki/Oberon/Naming#Files,_Servers_and_Viewers) Mail.UIDLFile creates a file name such as "UIDL.172.23.5.1.peterXeasthope.ca". That's 33 characters. Mail.UIDLFile attempts to open or create a file with that name but fails with any name longer than 27 characters. Ie. name + .Bak + 0x is limited to 32 characters. The OFS module declares, CONST ... PreLength = 16; LocalLength = 128; FileNameLength = PreLength + LocalLength; Have yet to find where and why the 27 + 5 character limit is imposed. It can interfere with the "dictum of meaninful file names". Conscientious as a user might be, a good name within 27 characters can be difficult. For Mail, the difficulty is more technical. Ideas? Thx, ... P.L. mobile: +1 778 951 5147 VoIP: +1 604 670 0140 https://en.wikibooks.org/wiki/User:PeterEasthope

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Re (2): Email UID.
by peter＠easthope.ca 19 Dec '22

19 Dec '22

Jörg, > UID is a unique identifier to uniquely identify a message in a mailbox folder. > In POP3, it‘s an arbitrary string with max 70 chars > In IMAP, it‘s a 32bit number (converted to string) > > You could write an email server for both protocols using the same UID > coding, ... Good. Thanks. My objective is add a hint in the wikibook. Google and Wikipedia haven't found a good reference yet. I might try to write something based upon your message. ETH O. and A2 O. have a file with name such as UIDL.127.0.0.1.peter(a)easthope.ca. Content here is this in one line. UID16252-1329772258UID77894-1329772258UID98661-1329772258 Three strings of 16 characters separated by the 0X character. 0X might display as an empty rectangle in a mail reader. Meanwhile, three messages exceed the size limit configured in Oberon Mail and wait on the server until the size limit accomodates or the server is accessed by another means such as Web mail. Thx., ... P.L. mobile: +1 778 951 5147 VoIP: +1 604 670 0140 https://en.wikibooks.org/wiki/User:PeterEasthope

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