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Undefined Behaviour

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Undefined Behaviour
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@fnky
fnky / ANSI.md
Last active Dec 2, 2022
ANSI Escape Codes
View ANSI.md

ANSI Escape Sequences

Standard escape codes are prefixed with Escape:

  • Ctrl-Key: ^[
  • Octal: \033
  • Unicode: \u001b
  • Hexadecimal: \x1B
  • Decimal: 27
@jboner
jboner / latency.txt
Last active Dec 1, 2022
Latency Numbers Every Programmer Should Know
View latency.txt
Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference 0.5 ns
Branch mispredict 5 ns
L2 cache reference 7 ns 14x L1 cache
Mutex lock/unlock 25 ns
Main memory reference 100 ns 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy 3,000 ns 3 us
Send 1K bytes over 1 Gbps network 10,000 ns 10 us
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD
View Quirks of C.md

Here's a list of mildly interesting things about the C language that I learned mostly by consuming Clang's ASTs. Although surprises are getting sparser, I might continue to update this document over time.

There are many more mildly interesting features of C++, but the language is literally known for being weird, whereas C is usually considered smaller and simpler, so this is (almost) only about C.

1. Combined type and variable/field declaration, inside a struct scope [https://godbolt.org/g/Rh94Go]

struct foo {
   struct bar {
 int x;
@IanColdwater
IanColdwater / twittermute.txt
Last active Nov 30, 2022
Here are some terms to mute on Twitter to clean your timeline up a bit.
View twittermute.txt
Mute these words in your settings here: https://twitter.com/settings/muted_keywords
ActivityTweet
generic_activity_highlights
generic_activity_momentsbreaking
RankedOrganicTweet
suggest_activity
suggest_activity_feed
suggest_activity_highlights
suggest_activity_tweet
@XVilka
XVilka / TrueColour.md
Last active Nov 23, 2022
True Colour (16 million colours) support in various terminal applications and terminals
View TrueColour.md

THIS GIST WAS MOVED TO TERMSTANDARD/COLORS REPOSITORY.

PLEASE ASK YOUR QUESTIONS OR ADD ANY SUGGESTIONS AS A REPOSITORY ISSUES OR PULL REQUESTS INSTEAD!

@aras-p
aras-p / preprocessor_fun.h
Last active Nov 22, 2022
Things to commit just before leaving your job
View preprocessor_fun.h
// Just before switching jobs:
// Add one of these.
// Preferably into the same commit where you do a large merge.
//
// This started as a tweet with a joke of "C++ pro-tip: #define private public",
// and then it quickly escalated into more and more evil suggestions.
// I've tried to capture interesting suggestions here.
//
// Contributors: @r2d2rigo, @joeldevahl, @msinilo, @_Humus_,
// @YuriyODonnell, @rygorous, @cmuratori, @mike_acton, @grumpygiant,
@slimsag
slimsag / ramblings.md
Last active Nov 7, 2022
Because cross-compiling binaries for Windows is easier than building natively
View ramblings.md

Because cross-compiling binaries for Windows is easier than building natively

I want Microsoft to do better, want Windows to be a decent development platform-and yet, I constantly see Microsoft playing the open source game: advertising how open-source and developer friendly they are - only to crush developers under the heel of the corporate behemoth's boot.

The people who work at Microsoft are amazing, kind, talented individuals. This is aimed at the company's leadership, who I feel has on many occassions crushed myself and other developers under. It's a plea for help.

The source of truth for the 'open source' C#, C++, Rust, and other Windows SDKs is proprietary

You probably haven't heard of it before, but if you've ever used win32 API bindings in C#, C++, Rust, or other languages, odds are they were generated from a repository called microsoft/win32metadata.

@robmint
robmint / gist:4753401
Last active May 18, 2020
Basic linux framebuffer graphics setup
View gist:4753401
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <linux/fb.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <stdint.h>
#include <stdbool.h>
#include <linux/input.h>
@1995eaton
1995eaton / png.c
Created Aug 23, 2014
A simple wrapper for libpng
View png.c
/* gcc -O2 -Werror -I/usr/include/libpng16 -lpng png.c -o png */
#include <stdio.h>
#include <stdlib.h>
#include <png.h>
typedef struct PNG {
int width;
int height;
int depth;