The Nineteenth Byte - 2016-08-26 (page 5 of 10)

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4:01 PM

so, why can't you do the same thing for compiled programs?

I inherited some code from a former PhD student and after I finally got it to compile, it greeted me with WARNING: DEBUG BUILD — SHIT WILL BE SLOW. I think I would have liked that guy.

8

Dude that star text cutoff tho

maybe it'll change with 10 stars

@Syxer I'm using SELinux with a context switch to confine interpreters. That gives a fine-grained control of the application's permissions.

@Dennis ooh okay probably easier that way

4:05 PM

Nothing that involves SELinux is easy (at least not for a noob like me), but it should be more secure.

@NathanMerrill Hm, that would require compiling the interpreter every time it is run. That works as a last resort, but I hope there's a better way.

@Lynn @Dennis - you'll be pleased to hear bounce has been used :)

@Dennis oh, we're talking compiling the interpreter?

Yaaay!

2

A: This isn't rocket science

Jelly, 37 bytes ;”_⁾ |;Ð€ŒḄ€;“/___\“ VvV”“ |“ /_\”;Y Same score as existing entry, but uses a fun new feature - ŒḄ, bounce. How? ;”_⁾ |;Ð€ŒḄ€;“/___\“ VvV”“ |“ /_\”;Y - argument: a string, S “ |“ /_\” - the top of the rocket [" |", " /_\"] ;”_ ...

ah, I though you were talking about compiled languages, not interpreters

hmmm...

yeah, I agree wiping the interpreter is a bad idea

4:07 PM

@Lynn, just a shame I couldn't bounce to make /_\ or /___\

er, can't you confine a process to a single folder?

@JonathanAllan I was gonna say, "yay, 4-way tie", but Pyke has 35 :(

:(

working on it :p

@NathanMerrill I'm sure it's possible. Still kinda new to the SELinux thing, but I'm confident I'll figure something out.

ah ok :)

4:11 PM

@Lynn @Dennis I feel I could add one leading space in for every line and rotate by 1 (with ___\/ with truncation to at most 5 char) but cant quite see how to do so in less bytes

@Dennis I'd star that if you golfed out the "Linu" part.

( ͡° ͜ʖ ͡°)

@El'endiaStarman I've actually hit this limit with perfectly valid code (parsing)

@Geobits wow

What? I'm just saying, it would look great on the starboard :P

4:16 PM

@Geobits Thank you, Dennis's conversations about his server are going to be a lot more entertaining from now on. :)

5

Glad to help. Don't overlook this gem:

11 mins ago, by Dennis

Nothing that involves SELinux is easy (at least not for a noob like me), but it should be more secure.

:D

@Geobits you should have waited until this conversation was over. Now Dennis is going to be careful about what he says from now on

Might have to switch to AppArmor...

@Geobits Look what you did ^

4:19 PM

> This guy probably spent hundreds of hours testing and researching this problem. He finally admitted to a rather drastic solution, removing the TOE chip from the NICs in multiple servers. (link)

Using it intentionally in future messages would be the right choice here.

@TimmyD When in doubt, remove the toes

...wow, its actually an inside joke that works online

Rohan Jhunjhunwala

I just got outgolfed in my own language.

@TùxCräftîñg any luck with that question yet?

Anonymous

@RohanJhunjhunwala It's a wonderful feeling

4:25 PM

@RohanJhunjhunwala Wow, that's wonderful!

if I remember correctly, it was a while before anybody outgolfed Dennis in Jelly...but that was because were all struck with awe and confusion

Anonymous

@Dennis Would you allow interpreters to read (and possibly write) to files within their own directory hierarchy? For example, say you had Actually cloned in /home/TIO/Actually/. Would you allow Actually to read (and possible write) to files in /home/TIO/Actually/some_directory?

struct -.- too much coding

Anonymous

@Dennis I think a possible solution here would be some sort of package management for the interpreters

Anonymous

Only keep the compiled interpreter around, and keep track of the current version installed. When a new version is available, download and recompile, and discard the source code.

Rohan Jhunjhunwala

4:28 PM

@LeakyNun but in all seriousness, thanks for helping out. I really do like getting outgolfed in my own language, because that implies that my language is interesting enough for someone to put in some time to lake a look at it.

@RohanJhunjhunwala I'm sure you will like this:

My very first post was made to get 10 rep so I could post in a protected post to outgolf Dennis :p

0

A: Sylvester's sequence

S.I.L.O.S, 60 bytes readIO p = 2 lblL r = p r + 1 p * r i - 1 if i L printInt r Try it online! Port of my answer in C.

@Mego Interpreters will be able to read most parts of the file system, but they won't be able to make any persistent changes.

...in Jelly that is

Anonymous

4:30 PM

@Dennis Ok, that's fair. That means that Actually's library support can be used on TIO once you and I get our respective stuff set up :P

@JonathanAllan That is awesome.

@JonathanAllan You'd think that would kill the meme, but no such luck.

@TimmyD all journeys start with the first step - make it in the right direction :)

6

Rohan Jhunjhunwala

:D

@Dennis That's because the meme is "simply" outgolf Dennis. Getting rep on another post just to be able to answer a protected post doesn't constitute "simple."

4:33 PM

@Dennis Thanks :)

"One does not simply outgolf Dennis"

I didn't even choose a particularly easy question either :p

Anonymous

Outgolfing Dennis typically involves large bribes being sent to his internet provider

@Mego Does that require writing temporary files to the directory you mentioned? If so, that would require some additional tinkering...

:p

Anonymous

4:36 PM

@Dennis Nope, just reading. Allowing for non-standard, user-created libraries will be a hassle on TIO, but we'll cross that bridge if people ever get interested enough to create their own libraries.

Anonymous

The only temporary files being written would be by Python, byte-compiling some files, but that's not essential

0

Q: Output source file name

Write a program that prints the name of its source file. REPL environments are not allowed for this challenge. Your code must work in any file that your language's interpreter will accept. Your answer must also be a full program, not just a function. The source code's file extension must be print...

code-golf kolmogorov-complexity file-system

Rohan Jhunjhunwala

blast off! Shameless self promotion!

0

A: This isn't rocket science

S.I.L.O.S 157 bytes (leading linefeed) def p print : lbl pLine | pLine /_\ loadLine : a = 256 :a x = get a if x c GOTO e :c p | pChar x pLine | pChar l a + 1 if x a :e pLine |_| pLine/___\ p VvV It should be fairly readable. Feel free to try it online!

@RohanJhunjhunwala `pLine/___` has not worked and spaces are printing something else on TIO

Yeah I get an error when I run it on TIO

Oh I didn't realize input needed to be command line arg

But still didn't work properly

Rohan Jhunjhunwala

4:44 PM

@JonathanAllan fixing now

Hayyyyy

@RohanJhunjhunwala silos.tryitonline.net/…

tips top hat

@RohanJhunjhunwala - why no final dot in S.I.L.O.S(.)?

NAA?

@zyabin101 Are you up for this challenge?

Rohan Jhunjhunwala

4:46 PM

@JonathanAllan fixed,

@JonathanAllan idk, on esolangs there is no final dot so I guess thats the official name

@zyabin101 chatgoat still thinks he's you

@LeakyNun Ohh, exempt

@zyabin101 Ok, I'll do it then

@RohanJhunjhunwala He's not you, here can't be Chatgoat, how can there be Chatgoat? relieved

Rohan Jhunjhunwala

?

@BusinessCat its fixed now... turns out fixing the bugs golfed it down more

@zyabin101 done:

0

A: Sylvester's sequence

UGL, 15 bytes cuuild@$d*u@:_o Try it online!

Eᴀsᴛᴇʀʟʏ Iʀᴋ

4:51 PM

@JonathanAllan it's an attribute

@LeakyNun Ah k 😃

Eᴀsᴛᴇʀʟʏ Iʀᴋ

s.i.l.o.s.print()

s.i.l.o.superior()

2

El'endia Starman

@LeakyNun cuuild seems like it's Gaelic/Welsh or something. :P

Eᴀsᴛᴇʀʟʏ Iʀᴋ

^

4:53 PM

@El'endiaStarman lol

@El'endiaStarman XD

Rohan Jhunjhunwala

:D

@JonathanAllan so there aren't two periods when you try to end your sentence with S.I.L.O.S.

3

@NathanMerrill or is there?.

Rohan Jhunjhunwala

@NathanMerrill thanks for coming up with a legitimate reason for leaving out the trailing period

5:01 PM

the alternate reason is that you wrote the language in PHP, and simply appended the letters together

It's so superior it's always the end of any sentence.

2

...er...read on

Thanks for the heads up :D

TùxCräftîñg

5:26 PM

@RohanJhunjhunwala ended up in a unreadeable mess, gave up.

4

A: Non-palindromic numbers

C, 82 bytes p(n,a,b,c,r){c=0;for(b=1;++b<n-2;c+=r==n)for(a=n,r=0;a>0;a/=b)r=r*b+a%b;return!c;} Ideone it! Explanation This code reverses n in base b and stores in r: for(a=n,r=0;a>0;a/=b)r=r*b+a%b; The outer loop counts the number of bases from 2 to n-1 in which n is a palindrome. If n...

How did my C answer get the most upvote :o

Rohan Jhunjhunwala

@TùxCräftîñg s/unreadable mess/beautiful spaghetti

TùxCräftîñg

Syntax error: Unmatched '/'

Rohan Jhunjhunwala

@LeakyNun how did the SILOS answer not get any upvotes beside mine rip

@RohanJhunjhunwala Would you do the challenge I just linked in SILOS?

Rohan Jhunjhunwala

5:27 PM

@LeakyNun sure

TùxCräftîñg

and btw the SILOS interpreter need to be rewritten

Rohan Jhunjhunwala

@TùxCräftîñg eh... soon (tm)

@TùxCräftîñg why?

@RohanJhunjhunwala Alright then

TùxCräftîñg

github.com/rjhunjhunwala/S.I.L.O.S/blob/master/Silos.java

my brain melted when i tried to understand how the fuck it works

Rohan Jhunjhunwala

@TùxCräftîñg it aint too complicated

So it just goes through teh commands

and does them

TùxCräftîñg

5:29 PM

question: do you know you can create multiple functions in a class?

Rohan Jhunjhunwala

If it sees a branching statement it goes to the corresponding label

@TùxCräftîñg yes

TùxCräftîñg

._.

Rohan Jhunjhunwala

<shameless-plug>

github.com/rjhunjhunwala/Orbital

</shameless-plug>

@RohanJhunjhunwala What does :a do?

Rohan Jhunjhunwala

@TùxCräftîñg the above gitHub repo has fairly well structured code

@LeakyNun its a label

5:30 PM

@RohanJhunjhunwala so instead of lbla I can now do :a?

Rohan Jhunjhunwala

@LeakyNun so the def : lbl preplaces the : with lbl

Oh

Releasing Helium Nuclei

> If you need more than 3 levels of indentation, you're screwed anyway, and should fix your program. –Linus Torvalds, 1995

3

TùxCräftîñg

Rohan need 8 level of indetation by mixing tabs and spaces

Rohan Jhunjhunwala

@LeakyNun yes just on the second line of code put def strToReplace replacement1 strToReplace2 replacement2

@TùxCräftîñg My IDE does it mostly for me

5:31 PM

@RohanJhunjhunwala Are you doing the challenge?

Rohan Jhunjhunwala

@LeakyNun yes, one second

SILOS is mindbending

TùxCräftîñg

@RohanJhunjhunwala your ide mix tabs and spaces ಠ_ಠ

Rohan Jhunjhunwala

@TùxCräftîñg no I just never hit format

@TùxCräftîñg rarely

TùxCräftîñg

;_; please press the button

Releasing Helium Nuclei

:|

Rohan Jhunjhunwala

5:33 PM

@TùxCräftîñg I will and then commit it

@TùxCräftîñg there is soon going to be gui support

@RohanJhunjhunwala Why is a leading linefeed needed?

Releasing Helium Nuclei

:ı

Rohan Jhunjhunwala

@LeakyNun the macro definition must be on the second line

TùxCräftîñg

@RohanJhunjhunwala gui support...

Rohan Jhunjhunwala

@TùxCräftîñg I have an err... unique way of implementing it... you'll see...

TùxCräftîñg

5:34 PM

gui support in a thing where programming a factorial is hard?

@RohanJhunjhunwala yay more wtf specs

Rohan Jhunjhunwala

@TùxCräftîñg programming a factorial is trivial here silos.tryitonline.net/…

TùxCräftîñg

...

@ReleasingHeliumNuclei I think a 20 year old quote might not be accurate today

@RohanJhunjhunwala I explored so many hidden features lol

Rohan Jhunjhunwala

@LeakyNun yes, there are "undocumented features"

TùxCräftîñg

5:38 PM

1

A: Send a cosmic call

Python 3, 64513 bytes Only use ASCII ! http://pastebin.com/PMLb4Xti Old version, 64529 bytes: http://pastebin.com/nteYkUtM

@RohanJhunjhunwala since you specified that the def must be one the second line... I moved the third line to the first line lol

TùxCräftîñg

someone deletevoted... ?

@TùxCräftîñg can't delete-vote positive vote-count answers

Releasing Helium Nuclei

> The square of the hypotenuse is equal to the sum of the squares of the other two sides. – Pythagoras, 500 BC

Rohan Jhunjhunwala

@LeakyNun I didn't realise that, that would work. I thought the macro wouldn't work on the first line, but it does since it parsees thorught the whole thing with a find/replace call

TùxCräftîñg

5:39 PM

user image

@RohanJhunjhunwala 10 bytes off

@TùxCräftîñg nvm

TùxCräftîñg

Solutions should be self-contained (the code should be viewable without relying on an external link). Because the code is longer than the post limit, you will need to compress it and provide the compressed code (usually that's done by base-64 encoding the compressed code). Given that this code contains already-compressed data, that will be quite the challenge for you. — Mego 5 mins ago

#compressionception

Rohan Jhunjhunwala

@TùxCräftîñg huh, I think relying on a pastebin is generally acceptable

Releasing Helium Nuclei

Compress the whole code, then exec it? :p

Rohan Jhunjhunwala

@LeakyNun thanks for saving me some bytes

TùxCräftîñg

5:43 PM

idk if posting a downloading code and adding it's length to the score is acceptable

@EᴀsᴛᴇʀʟʏIʀᴋ No, I'm not that good

Rohan Jhunjhunwala

@TùxCräftîñg its a "standard loophole" idk though, I think your answer is just fine.

Eᴀsᴛᴇʀʟʏ Iʀᴋ

okay, so only the knob has?

Rohan Jhunjhunwala

have a n upvote

Eᴀsᴛᴇʀʟʏ Iʀᴋ

@quartata do you know if mego has?

5:45 PM

Definitely not

I think we only got him to play once

TùxCräftîñg

@RohanJhunjhunwala ah forget this >_>

1

A: Send a cosmic call

Pyth, 46381 bytes For obvious reasons it cannot be posted here. jc.BC"<too long>"127 Sample. Pastebin of hexdump of program.

another answer with code on pastebin

@TùxCräftîñg wait wat where is that specified

TùxCräftîñg

idk

Releasing Helium Nuclei

What is the size of the original image?

TùxCräftîñg

46370 bytes

5:47 PM

clearly the solution here is to store your code in image form on imgur

4

Rohan Jhunjhunwala

@LeakyNun the Sylvester sequence is hard

that way, if imgur goes down, both the question and the answer goes down

@RohanJhunjhunwala Are you doing it or not?

Rohan Jhunjhunwala

@LeakyNun yes, I just wanted to let you know that it might take a bit. Ill have it before 2:15 hopefully

@RohanJhunjhunwala timezone?

Rohan Jhunjhunwala

5:48 PM

EST

@RohanJhunjhunwala noted

TùxCräftîñg

;_; my answer is the longest

In place swapping in SILOS \o/

Releasing Helium Nuclei

I want to try this with MarioLANG

TùxCräftîñg

promise to be hard

5:54 PM

@RohanJhunjhunwala Do you know why you need a prompt for loadLine but not readIO?

It's because of your inconsistency:

				} else if (tokens[0].equals("readIO")) {
					mem['i'] = getIntFromUser(line.substring(7));
				} else if (tokens[0].equals("rand")) {
					mem['r'] = (int) (Math.random() * evalToken(tokens[1]));
				}else if(tokens[0].equals("loadLine")){
					String in = getStringFromUser(tokens[1]);

line.substring(7) vs tokens[1]

Rohan Jhunjhunwala

@LeakyNun oh yeah, I was too lazy to count the characters in loadLine

@LeakyNun let me fix it

@LeakyNun once I'm done the challenge

Alright

Rohan Jhunjhunwala

So I'd just replace it with line.substring(9); right?

@RohanJhunjhunwala yes

...this is why I use other people's parsers

5:58 PM

@Doorknob Been scrolling through the Nethack source code and so far it's actually not that bad

I was expecting something far more hideous

Rohan Jhunjhunwala

@NathanMerrill yeah, I have been too scared to actually write a nice cfg parser

try out antlr

you define a grammar, and it parses it for you

Yeah, there are plenty of parser generators you could use

Bison supports Java I think

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The Nineteenth Byte

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