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“What I cannot build, I do not understand” - Richard Feynman

Guilherme Rossato GuilhermeRossato

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“What I cannot build, I do not understand” - Richard Feynman
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@GuilhermeRossato
GuilhermeRossato / Memcache.php
Created August 2, 2019 20:13
Pure dependency-less memcache class implementation for development purposes that saves data to local storage.
<?php
// Ever needed to test an application that uses Memcache but didn't have it installed locally?
// This class saves its information to a local folder named "data" with the raw data passed to it.
// Each different key saved creates a new file on your system.
// Currently the only methods supported are Memcache::get and Memcache::set.
/**
* A class that mimicks the Memcache php dependency minimalistically by saving data to local storage.
@GuilhermeRossato
GuilhermeRossato / http_multiclient_server.c
Created August 2, 2019 19:53
Simple, high-performant, raw multi-client HTTP Server written in C with fork and sockets for Unix.
/*
Simple http server (with multiple connections)
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/wait.h>
@GuilhermeRossato
GuilhermeRossato / approximate-root.c
Created May 7, 2019 23:10
Incomplete source for a program that computes a root of a polynomial of any size with a guessing-based approach
// Incomplete source for a program that computes a root of a polynomial of any size with a guessing-based approach
//
// File: approximate-root
// Compilation: gcc -o main approximate-root.c
// Run: ./main
#include <stdio.h>
#include <stdlib.h>
double get_value_of_n_degree_polynomial(double x, double *coeficients, int coeficients_length) {
@GuilhermeRossato
GuilhermeRossato / main.c
Created April 23, 2019 22:39
A script to run other programs defined in a configuration file
//
//
// Works both on windows and linux
//
//
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
@GuilhermeRossato
GuilhermeRossato / test-disk-speed.c
Last active April 23, 2019 22:16
Simple C Disk Writing Benchmark for Windows
/*
* Description:
* C program for windowsto write to a file in 4096-byte blocks to a new file until it reaches 16777216 bytes (16MB)
*
* Supported OS:
* Windows and Linux
*
* Recomendations:
* Disable linux disk cache:
* sudo /sbin/sysctl -w vm.drop_caches=3
@GuilhermeRossato
GuilhermeRossato / ErrorHandler.php
Created October 18, 2018 01:23
Small PHP Error handler to format every error and show where the error happened
<?php
$error_was_already_triggered = false;
function process_error_handler($errno, $errstr, $errfile, $errline) {
global $error_was_already_triggered;
$error_is_marked_as_ignored = (error_reporting() == 0);
if ($error_is_marked_as_ignored || $error_was_already_triggered) {
return;
@GuilhermeRossato
GuilhermeRossato / OrderedList.py
Created September 19, 2018 04:49
Self ordering ordered list (queue) implementation in python
import math
class OrderedList:
"""A self organizing list of (key, object) pairs ordering by the key"""
def __init__(self):
self.data = []
self.tests = 0
def __len__(self):
@GuilhermeRossato
GuilhermeRossato / CaptureScreenAndSave.h
Last active September 25, 2020 00:45
C++: Capture a sequence of screenshots and save with fixed interval (e.g. to make a GIF in sequence)
// Credits:
// Windows Capture and Save: Michael Ftsch
// Linux Capture and Save: None
//
#ifdef _WIN32
#include <windows.h>
inline int GetFilePointer(HANDLE FileHandle) {
return SetFilePointer(FileHandle, 0, 0, FILE_CURRENT);
@GuilhermeRossato
GuilhermeRossato / debugbacktrace.php
Last active January 29, 2018 01:32
PHP retrieve better information from debug_backtrace without exausting memory
<?php
/*
* Output example at the bottom of this gist
*/
function get_formatted_debug_backtrace() {
$content = debug_backtrace();
$ret = [];
foreach($file_paths AS $file_path) {
$var = $file_path;
$ret[] = "File: ".$var['file'].": ".$var['line']."\n";
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GuilhermeRossato / weekdayByDate.js
Last active August 2, 2019 19:59
Fast and compact way to get the weekday by date (year, month and day) in pure javascript
/**
* A pure function that retrieves the day of the week of a given date.
* Does not check if the date exists (i.e. 2019/02/31 yields a weekday, but doesn't exists).
*
* @param {number} y The year as a number with 4 digits
* @param {number} m The month as a number between 0 and 11 (january to december)
* @param {number} d The day as a number between 0 and 31
* @return {number} The number of the weekday, between 0 (monday) to 6 (sunday)
*/
function weekdayByDate(y, m, d) {