Jacajack

/*
	Compile with: clang -O3 -o nsect nsect.c -Wall -DCOUNT=5000000 -DNSECT=? -funroll-loops
*/

#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <sys/time.h>

Jacajack

# liblightmodbus - a lightweight, multiplatform Modbus library
# Copyright (C) 2017 Jacek Wieczorek <mrjjot@gmail.com>

# This file is part of liblightmodbus.

# Liblightmodbus is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

Jacajack

struct iir_filter
{
	float *w; // w coefficients
	float *a; // a coefficients
	float *b; // b coefficients
	int n;    // filter size
};

float iir_push( struct iir_filter *f, float x )
{

Jacajack

Jacajack

#!/bin/bash

BLOCK="gambling porn fakenews social"
EXCEPT=""

cp hosts hosts.new

# Base
echo "blocking adware + malware..."
curl -s "https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts" | sed -ne '/# Start StevenBlack/,$p' >> hosts.new

Jacajack

#include <setjmp.h>
#include <stdio.h>

union exception_data
{
	const char *string;
	double d;
	int i;
};

Jacajack

---
BasedOnStyle: LLVM
TabWidth: 4
IndentWidth: 4
UseTab: Always
ColumnLimit: 0
---
Language: Cpp

AccessModifierOffset: 0

Jacajack

Cool commands I keep forgetting about

• pandoc file.md -t beamer -o out.pdf - create beamer presentation from markdown file
• nm - list symbols from object file
• sending file with Xmodem (requires lrzsz):
• • screen /dev/tty* 115200
• • Ctrl + A, :exec !! sx file.txt
• sudo getty -L 115200 ttyUSB0 vt102 - terminal over serial line (persistent)
• objdump -D -b binary -mi386 -Maddr16,data16 -Mintel file.bin - disassemble raw 16-bit i386 binary file with Intel syntax
• ffmpeg ... -vcodec hevc_nvenc/h264_nvenc - use Nvidia GPU for video encoding with ffmpeg
• echo "file.txt" | entr command - run command each time file changes

Jacajack

#include "url_request.hpp"
#include <algorithm>
#include <stdexcept>

// The write callback function
size_t url_request::write_callback( void *contents, size_t size, size_t nmemb, void *userp )
{
	size_t realsize = size * nmemb;
	url_request *rq = static_cast<url_request*>( userp );
	std::uint8_t *b = static_cast<std::uint8_t*>( contents );

Jacajack

Warnings:

• -Weverything - even more than -Wpedantic in Clang

Debugging:

• -g - Preserve debugging symbols
• -fno-omit-frame-pointer - if some symbols remain broken
• -fno-builtin - Do not perform some printf, scanf, malloc, etc. optimizations (debugging is easier)
• -fsanitize=address - Use address sanitizer
• -fsanitize=thread - Use thread sanitizer
• -fsanitize=undefined - Use UB sanitizer