The Nineteenth Byte

zyabin101

15:02

@ArtOfCode No one comes to the QPixel IRC channel! D:

Geobits

@PhiNotPi Very nice "slight head turn to look at camera" shots. So appropriate.

quartata

@zyabin101 because it's not really meant to be used yet

zyabin101

@quartata Ikr.

quartata

@AlexA. I just went into the Julia room and saw the new vectorization syntax. Now my eyes are bleeding all over my desk. Next time please put a trigger warning

Jester Tran

In C code, what is the most condensed line of code to traverse through a Binary Search Tree? (obviously using recursion)

Nathan Merrill

15:14

@mınxomaτ you know what, I'm super surprised this hasn't come up again. I mean, there's got to be other sites that care about SRI and browser compatibility

before*

Jester Tran

Right now, I have

void traverse (Tree t) {
if (t->left) traverse(t->left != NULL);
else if (t->right != NULL) traverse(t->right);

Nathan Merrill

shorten variable names

remove whitespace

also, you don't need braces

Jester Tran

how about that?

Nathan Merrill

you still have whitespace

but better :)

also, instead of having two if statements, you can simply do if(t) around the whole function

Jester Tran

Ok, I get the idea but is there a one-liner that uses conditional statement:

A ? B : C

@NathanMerrill what do you mean? can I remove that "else if (...)"?

Nathan Merrill

15:20

void a(T t){if(t){a(t->l);a(t->r)}}

Jester Tran

@NathanMerrill I C. Thanks! :)

Nathan Merrill

:)

TimmyD

@mınxomaτ First I've ever heard of SRI (I'm not a webdev), but I agree with Nathan that it sounds like a Firefox bug.

orlp

15:43

@NathanMerrill void a(T t){if(t)a(t->l),a(t->r);}

Nathan Merrill

@JesterTran ^

cat

0

Q: Where are the definitions for the prototype declarations in <bsd/stdlib.h>

I have a C program on Ubuntu 16.04, in which I would like to use arc4random_uniform. typedef unsigned char u_char; #include <bsd/stdlib.h> int main () { return (int) arc4random_uniform(100); } Hopefully, this will return to the OS with a random exit code between 0 and 100. Compiling it: $ gcc...

orlp

@cat why do you want to use arc4random?

New Main Posts

0

Q: Maintain the same average value while respecting ratios

I have such a problem on hand. Imagine there are 5 sliders with a range of values 0 to 100. In the beginning, they are all set to 50, so the average score is 50. Goal 1. Maintain average at 50 Say, if I move the first slider to 70, in order to maintain the average at 50, I decrease the value of...

math

cat

@orlp stackoverflow.com/a/35806745/4532996

orlp

15:47

@cat do you need cryptographic randomness?

cat

I don't want to use rand() % whatever because of modulo bias.

@orlp Well... it's a toy project, but yes, I do want cryptographic randomness.

Currently, I use this:

orlp

what is your use case?

cat

// stackoverflow.com/a/6852396/4532996
uint64_t rand_range(uint64_t max) {
  uint64_t
    // max <= RAND_MAX < ULONG_MAX, so this is okay.
    num_bins = max + 1ULL,
    num_rand = (uint64_t) RAND_MAX + 1ULL,
    bin_size = num_rand / num_bins,
    defect   = num_rand % num_bins;

  // This is carefully written not to overflow
  uint64_t x = 0;
  do {
    x = (uint64_t) rand();
  } while (num_rand - defect <= (uint64_t) x);

  // Truncated division is intentional
  return x / bin_size;
}

My use case is to generate a random number in a range

orlp

no

that's what you're doing

Nathan Merrill

@NewMainPosts this isn't too bad of a potential challenge idea

orlp

15:49

what is your use case

what are you using the random numbers for

cat

okay, it's for a guessing game where the user tries to guess the number, and I'm aware cryptographic security is not at all warranted

Eᴀsᴛᴇʀʟʏ Iʀᴋ

When people are appalled that you actually listen to rick astley because you like the music....

4

cat

but I just really wanna use arc4random_uniform, also because it will impress my programming teacher

Eᴀsᴛᴇʀʟʏ Iʀᴋ

lol

cat

@EᴀsᴛᴇʀʟʏIʀᴋ 0.0

Eᴀsᴛᴇʀʟʏ Iʀᴋ

15:51

._.

>_>

I do actually like his singing....

cat

@orlp I promise it's not X/Y problem :P

mınxomaτ

@NathanMerrill BootstrapCDN is now SRI-secured by default. And it works in Firefox. But that's a JS file, and apparently the SRI implementation is a bit wonky for other MIMEs. I don't really get why SRI is not more common. For large sites (like gstatic), it's the only way to protect against bitsquatting JS attacks.

El'endia Starman

@mınxomaτ I know some of these words. (What's SRI?)

Eᴀsᴛᴇʀʟʏ Iʀᴋ

@cat why are you so suprised?

Nathan Merrill

@El'endiaStarman subresource integrity

aka, when I request a CSS file from a CDN, I have a hash in my code that ensures that the CSS file is actually the one I asked for

mınxomaτ

15:55

@El'endiaStarman Basically a checksum for the browser to check the integrity of an asset.

ninja'd

Nathan Merrill

:)

cat

@EᴀsᴛᴇʀʟʏIʀᴋ I'm not really :P he is a good singer

Eᴀsᴛᴇʀʟʏ Iʀᴋ

:D

brb

El'endia Starman

@NathanMerrill Is that something that happens automatically or do you have to be explicit about it?

Nathan Merrill

explicit. You add an attribute to your <link> or <script> tag

mınxomaτ

15:57

@El'endiaStarman Read this: hacks.mozilla.org/2015/09/subresource-integrity-in-firefox-43

@NathanMerrill Which can happen automatically, if e.g. your server-side stack generates the hash JIT from the local, original file.

Nathan Merrill

right, but it's not automatic on the browser side

mınxomaτ

@NathanMerrill That's physically impossible. :D

Nathan Merrill

right :)

El'endia Starman

@mınxomaτ Huh, that's cool.

Eᴀsᴛᴇʀʟʏ Iʀᴋ

^

Nathan Merrill

15:59

although, I did see a link where somebody was suggesting the browsers would hit the original server saying "the hash of this file is X, is that correct"

but I'm not a fan of that solution

are there any benefits to adding SRI to resources that aren't on a CDN (assuming that you are serving them over HTTPS)?

cat

I gave gcc -lbsd but it still can't find the definition for arc4random_*, what is this bullcrap

Rainbolt

Haha. One of our front office challenged one of our devs to a "Steps challenge" (who can take the most steps in a month, tracked by a specific pedometer, validated by the honor rule). The dev said "The biggest challenge for me will be seeing this as a challenge."

TimmyD

cries ... Trig is not a strong suit for PowerShell ...

430 bytes into this Fermat's point challenge, and all I've done so far is determine if there is an angle greater than 120 degrees

cat

@TimmyD Maybe you should use Bash instead. Or jQuery.

TimmyD

:D

mınxomaτ

16:10

@NathanMerrill Yes. Every asset is an extra request exposed to possible bitsquatting. There is no way to prevent this kind of attack. You can only reduce the amount of "vulnerable" requests. Ideally, the HTML should be the only exposed transfer, all other assets should be served with SRI attributes.

"all other assets" meaning anything that can hurt the user, i.e. code. Not images etc.

Optimizer

mınxomaτ

@Optimizer Ah classic German comedy show.

zyabin101

@VTC github.com/VTCAKAVSMoACE/Laura

That's very... descriptive.

Optimizer

cat

@Optimizer murica.

mınxomaτ

16:13

@zyabin101 Every time I read "VTCAKAVSMoACE", this is what I read first.

cat

^

Cyoce

@mınxomaτ Wikipedia links are a crutch for the weak! Put the name of the article on the link like a [wo-]man.

cat

@Cyoce person*

epicTCK

@mınxomaτ NSFW

cat

^

mınxomaτ

16:16

@epicTCK Hardly

Though it might be awkward to explain to your boss.

epicTCK

Or worse, my dad...

mınxomaτ

haha

epicTCK

my extra mouse keys are macro'd to switch desktops, so It's all good...

I keep TNB on one and school on another

Cyoce

> mouse key

epicTCK

@Cyoce Button

my mouse ^

Optimizer

16:22

My name is Wade Wilson. And I am the fastest man alive

Cyoce

mine ^

epicTCK

Are those considered keys or buttons?

Cyoce

buttons. keys are generally found on a keyboard

epicTCK

My dream mouse

Logitech mx master

I own my dream keyboard though

Cyoce

epicTCK

16:26

my keyboard^^

@Cyoce Does the color change?

Nathan Merrill

lol, I use a touchpad and laptop keyboard

like a real programmer

Cyoce

@epicTCK no. it's based on this:

steamcommunity-a.akamaihd.net/economy/image/…

Nathan Merrill

Real programmers set the universal constants at the start such that the universe evolves to contain the disk with the data they want.

epicTCK

@NathanMerrill Meh... touchpads are good until you start editing pictures, doing mouse intensive work, or gaming

so the are good for everything I don't do

Nathan Merrill

what's "mouse intensive work"?

quartata

16:28

@Cyoce ermahgerd factory new mouse | fade

did you unbox that

epicTCK

Photo editing / gaming mainly

Nathan Merrill

-.-

because while I do use a mouse for some of my games, I avoid it if I can

quartata

@ArtOfCode All right, so I have all of the IRC stuff down (I've tested it all too)

I'm super shit at Rails though so this next part will be.. more difficult

ArtOfCode

@quartata sweet

epicTCK

Wait what is this you guys are making

ArtOfCode

16:30

shout if you need a hand, though it'll be in an hour or so 'cos I've got to head off... soon? I think?

@epicTCK chat for stage.artofcode.co.uk

based on IRC, quartata is making auth for it

Eᴀsᴛᴇʀʟʏ Iʀᴋ

ohai

zyabin101

@ArtOfCode And also thinks it is not ready for production yet ಠ_ಠ

@EᴀsᴛᴇʀʟʏIʀᴋ HAI

Eᴀsᴛᴇʀʟʏ Iʀᴋ

@NathanMerrill I do also, just sometimes a mouse.

epicTCK

So what is it? like a secondhand SE? IDK...

Eᴀsᴛᴇʀʟʏ Iʀᴋ

yeah

@zyabin101 HAI

Rainbolt

16:32

TIL we've had a Lego Stack Exchange for five years (still in beta).

Eᴀsᴛᴇʀʟʏ Iʀᴋ

yeah

not enough lego ~~addicts~~ fans

Rainbolt

quartata

@zyabin101 Because it isn't?

Eᴀsᴛᴇʀʟʏ Iʀᴋ

in The 2nd Monitor, 1 min ago, by Dan Lyons

If it fits, I plugs.

quartata

@ArtOfCode gist.github.com/quartata/0c08f8c70e9d0d14e6cb3dd78ba51622

What I have right now.

I'll need to redo a couple parts when I put it in the Rails side obviously

epicTCK

16:34

I stopped playing with lego

quartata

But literally the only thing missing is check_auth which is where Rails come into play

Nathan Merrill

110

Q: How much usage can a LEGO piece take before it loses its 'clutch power'?

In this article it's mentioned that one very important feature of the LEGO bricks are their 'clutch power' which is "the ability of its bricks to snap together tightly while also being easy to separate, thereby readily allowing for de- and reconstruction" Since a LEGO brick is ABS plastic and wi...

plastics durability

quartata

It only works on TS6 servers so ircd-ratbox, ircd-hybrid, etc..

Rainbolt

@NathanMerrill That is insane...

quartata

I tested it on a local ircd-hybrid

Nathan Merrill

16:36

lol yeah

quartata

and yeah the code is a little messy sorry

Nathan Merrill

oooh, another interesting one

45

Q: Is it possible to build simple logic gates with LEGO mechanics?

I built a simple bitshifter in Minecraft yesterday. I wondered if something like this could be built with LEGO? Maybe there is a possibility to build gates with rubber bands and those movable mechanic stuff. Did anyone of you do something like this?

technic electronics

Optimizer

LEt it GO

Rainbolt

Instead of thinking about tits, I am now just angry that "Let It Go" is stuck in my head again.

Optimizer

hahahaha

epicTCK

16:39

@NathanMerrill Just saw that

@Rainbolt Hoping thats a typo

Optimizer

@Rainbolt I was gonna say that think only about the central part.. but then I remembered.. you have no interest :P

El'endia Starman

@NathanMerrill That guy deserved the rep he got. :P

zyabin101

@Art What is the IRC chan waiting for? A nickserv? Becoming production-ready? Something else?

Optimizer

@Rainbolt this should help

Rainbolt

Definitely made it worse :(

Rubbing salt in the wound

Optimizer

16:41

paprika

Nathan Merrill

hmmm...SE needs a question of "What hurts the most when rubbed in a wound"

the question is what site it belongs on

Rainbolt

@Optimizer Mmm, it's becoming a tasty wound

Nathan Merrill

health.stackexchange.com?

Optimizer

are you gonna eat it?

Rainbolt

@NathanMerrill Omg do not click on the first question there

Wow, I am trying to get fired

epicTCK

16:43

@Optimizer SFW (phew)

Nathan Merrill

@Rainbolt lol, did you read the title?

Rainbolt

Read the title. Did not expect an image.

Nathan Merrill

lol

Optimizer

@Rainbolt or was it intentional ? :P

Sp3000

@Optimizer Did someone say... Paprika?

Nathan Merrill

16:46

I've got this pandora channel that's been delivering awesome songs for the past couple of days. Its always been a struggle to keep my channels on topic and interesting, but its nice to finally have one

epicTCK

@Rainbolt Well the mods there are lazy or they allow those kinds of images...

Optimizer

@Sp3000 WTF?

orlp

spotthedrowningchild.com

Optimizer

-9 seconds'

it almost looks like I made the child drown..

Nathan Merrill

if you find a security bug and report it to a site, how long should you wait before you exploit it?

(I didn't find a bug, just curious)

Optimizer

16:56

1 minute

Geobits

I always thought you were supposed to exploit it first, then report it.

3

Nathan Merrill

-.-

quartata

@ArtOfCode I made a separate branch for the IRC testing

Geobits

@NathanMerrill Ok, ok. Exploit it and don't report it?

zyabin101

@quartata For QPixel?

epicTCK

16:59

@Geobits yup

Once I hacked the game vertix.io then had some fun then emailed the dev. He fixed it.

everyone is playing vertix

Nathan Merrill

vertix*

*test

apparently markdown isn't greedy

Martin Büttner

oris*it

Nathan Merrill

that's bizarre

zyabin101

yes,*itis*

Nathan Merrill

then why is the asterisk above in italics?

Martin Büttner

17:04

why not?

wouldn't that be consistent with greediness?

Nathan Merrill

oh wait, yeah

what is it called when it stops as early as possible?

1*2*3*4

reluctant apparently

Martin Büttner

@NathanMerrill oh I see. I guess that's also a form of greedy algorithm. but the reason it didn't is that markdown doesn't do empty italics/bold sections.

****

^ well that's interesting

Nathan Merrill

huh, yeah

zyabin101

@NathanMerrill lazy

@VTC Are you going to publish Laura?

VTCAKAVSMoACE

@zyabin101 Not yet.

That's just to get me to actually work on it.

5

Optimizer

17:16

beee cause

when the sun shines we shine together

VTCAKAVSMoACE

@VTCAKAVSMoACE Meanwhile, in my household...

/me achieves maximum gif-age.

zyabin101

@ArtOfCode IRC ees ded D:

Because no one wants to develop it.

El'endia Starman

I thought quartata was working on it.

Anonymous

We can tell you're young by your gif-age :P

zyabin101

@El'endiaStarman It is.

VTCAKAVSMoACE

17:26

@Mego ಠ_ಠ

zyabin101

But no one is chatting :(

trichoplax

@VTCAKAVSMoACE Another one?? How gif-old are you?

Downgoat

Apr 4 at 0:39, by Downgoat

What did I just walk into ._.

VTCAKAVSMoACE

@trichoplax ∞

trichoplax

maximum. I see.

Anonymous

17:49

gif abuse eleven

Optimizer

what is gif-age?

Anonymous

@Downgoat A goat walks into a bar. And a stool. And a table. The bartender says, "I knew you were trouble when you walked in."

Downgoat

@Mego oh hey, it's my cousin uprightgoat in that video!

ArtOfCode

@quartata looking good, anything I need to do?

trichoplax

@Optimizer I think it's the tax payable for littering the transcript with data heavy nonsense

Anonymous

17:57

@Downgoat Unlike you, he's an upstanding citizen :P

Downgoat

._.

Agawa001

boo

Downgoat

@Agawa001 aahhhhh

Agawa001

nice thing that worked not as before, i thought i would have to repeat it

people im stuck in a sticky trouble, my company wants me to build software with VB 2015 and i really suck at oo languages

Nathan Merrill

I really wish I could write queries on youtube videos

trichoplax

18:07

@Agawa001 Unless they're asking you for OO, you can write VB without using much in the way of object orientation

Nathan Merrill

specifically, Select videos with at least 1 downvote, sorted by numUpvotes/totalVotes desc

trichoplax

You want to find the most popular of the somewhat hated videos?

Nathan Merrill

basically, the least hated video

Anonymous

Least hated video is the video that has not yet been posted

trichoplax

Least instance of non-zero hatred

Agawa001

18:09

@trichoplax vb is nothing without objects

Nathan Merrill

right. It can't be zero, because then you're going to get a bunch of videos with 10 views and 1 like

and every video of sufficient size has at least 1 downvote

although, finding the video with the most views with no downvotes would also be interesting

trichoplax

@Agawa001 You can write it more or less procedurally. You can use the existing objects for events and interaction without needing to make any of your own if you don't want to

Agawa001

events , that word is scaaaaary

trichoplax

I'd just like the option to filter youtube searches to show only videos with no ads. Or only ads below a certain level of irritation (like 30 seconds unskippable)

Nathan Merrill

youtube red?

El'endia Starman

18:12

Adblock? :P

trichoplax

Is that paid youtube with no ads?

Anonymous

@trichoplax The problem is, the ads aren't deterministic. You can watch the same video twice, and get no ads the first view, and a 30-second ad the second.

Nathan Merrill

@trichoplax and other stuff, yeah

trichoplax

@El'endiaStarman Does that work for ads within a video?

Anonymous

Or use AdBlock and get no ads, and fight back against the intrusive advertising

Nathan Merrill

18:13

@trichoplax if its actually part of the video, no. Standard ads, yes

Anonymous

I only see Youtube ads on mobile now

El'endia Starman

@trichoplax Yep. I regularly see numbers in the thousands when playing a video on loop...

It's insane how hard some sites try to show you ads.

trichoplax

Wow

Nathan Merrill

yeah, I'm on video #3 on youtube, and I'm on 106

quick poll: what are you currently listening to?

trichoplax

My laptop fan

Anonymous

18:15

My cat trying and failing to kill a fly

El'endia Starman

Haha, I just put back on my processors after taking a shower, so nothing at the moment besides ambient sounds.

Nathan Merrill

you all are lame. Listening to Mika

Anonymous

My cat is all the entertainment I need

Anonymous

Except for maybe Path of Exile

trichoplax

@QPaysTaxes I hope you're typing quietly...

Nathan Merrill

18:19

occasionally, I press the enter quite hard that I've got more than a few comments saying that I'm going to break my keyboard

usually when I'm submitting something (like on chat, or a url)

Eᴀsᴛᴇʀʟʏ Iʀᴋ

18:33

This review:

codegolf.stackexchange.com/review/close/30388

The close reason mentions a ~~meta~~ Dennis consensus. Link to statement?

note: I do agree, just apparently I missed something?

Anonymous

@EᴀsᴛᴇʀʟʏIʀᴋ Look 3 comments up

Eᴀsᴛᴇʀʟʏ Iʀᴋ

oh, oops

thanks

And it says a lot about you that when your friends jump off a bridge en masse, your first thought is apparently 'my friends are all foolish and I won't be like them' and not 'are my friends ok?'.

ArtOfCode

@QPaysTaxes well played

Martin Büttner

@QPaysTaxes no it's not.

there, have your star back :P

ArtOfCode

@QPaysTaxes wouldn't have fallen for it... I recognise the video code.

Eᴀsᴛᴇʀʟʏ Iʀᴋ

18:47

@QPaysTaxes I ninja'ed you to that, long long ago.. ;P

ArtOfCode

@QPaysTaxes variable?

so what is used?

El'endia Starman

Diffuse?

Fatalize

@QPaysTaxes damn you're fast

ArtOfCode

ah, that's it - you want approximate

Eᴀsᴛᴇʀʟʏ Iʀᴋ

in The 2nd Monitor, Feb 29 at 19:00, by Easterly Irk

This may be us , but we are proud

the comma.

...ass

/s

Fatalize

18:50

huehue

Eᴀsᴛᴇʀʟʏ Iʀᴋ

@QPaysTaxes ._.

Thanks for stars.

2

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Cops and Robbers: Significant Whitespace code-golfcops-and-robberswhitespacestring For the purpose of this challenge, we'll define whitespace as tabs (0x09), linefeeds (0x0A) and spaces (0x20). Note that most languages and regex flavours consider many other characters as whitespace as well, bot...

Eᴀsᴛᴇʀʟʏ Iʀᴋ

@QPaysTaxes ._.

Transcript for