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@jsoffer
jsoffer / simplereader.c
Created February 28, 2016 12:09
libdwarf example
/*
Copyright (c) 2009, David Anderson; 2016, Jaime Soffer.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
@mamonu
mamonu / qcow2vdi.sh
Last active April 27, 2025 12:25
convert a qcow2 vm to a VirtualBox vm format
qemu-img convert -O vdi gnome.qcow2 gnome.vdi
#if its a raw image then:
VBoxManage convertdd opnstk.raw VBox.vdi --format VDI
@stanislaw
stanislaw / utf8.c
Created November 19, 2015 23:09
Some C functions to work with UTF-8 string : you can check if a string is valid UTF-8, get the length of a UTF-8 string and replace things in a UTF-8 string. All `char *` arguments must be regular, null-byte terminated, C strings. I've tried to optimize the best I could. I'd be grateful for any suggestions or improvements. Please note I have onl…
//
// utf8.c
// training
//
// Created by Conrad Kleinespel on 5/27/13.
// Copyright (c) 2013 Conrad Kleinespel. All rights reserved.
//
#include <stdio.h>
#include <stdlib.h>
@mishurov
mishurov / syntax.s
Last active April 10, 2025 16:07
AT&T assembly syntax and IA-32 instructions
# --------
# Hardware
# --------
# Opcode - operational code
# Assebly mnemonic - abbreviation for an operation
# Instruction Code Format (IA-32)
# - Optional instruction prefix
# - Operational code
@gubatron
gubatron / compiling_building_c_cpp_notes.md
Last active April 15, 2025 16:19
Things to remember when compiling and linking C/C++ programs

Things to remember when compiling/linking C/C++ software

by Angel Leon. March 17, 2015;

Last update on December 14, 2023

Updated on February 27, 2023

Updated August 29, 2019.

@hlissner
hlissner / replace.sh
Last active September 11, 2023 10:14
Bulk search & replace with ag (the_silver_searcher)
# ag <https://github.com/ggreer/the_silver_searcher>
# usage: ag-replace.sh [search] [replace]
# caveats: will choke if either arguments contain a forward slash
# notes: will back up changed files to *.bak files
ag -0 -l $1 | xargs -0 perl -pi.bak -e "s/$1/$2/g"
# or if you prefer sed's regex syntax:
ag -0 -l $1 | xargs -0 sed -ri.bak -e "s/$1/$2/g"
@ruario
ruario / small-slackware.md
Last active May 3, 2024 20:15
A short guide to quickly setting up a small Slackware install

Setting up a "small" Slackware install

Intro

Before you do this, reconsider if it is really needed. More often than not, it isn't. This is why.

A common reason for attempting a minimal install is an expectation that Slackware will run faster. This is not true. Some example, (IMHO) valid, reasons for stripping back the install include:

  • Installing on a device with limited disk space, where it is hard to add additional storage
  • A setup where there is an ongoing cost to rent disk space (e.g. a Virtual Private Server)
@jboner
jboner / latency.txt
Last active May 19, 2025 10:09
Latency Numbers Every Programmer Should Know
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