Stelios Petrakis stelabouras

A generic dynamic array in C that stores no capacity and needs no struct

The following header shows a way to make a generic dynamic array in C with an array of two pointers:

one pointer (accessible as vec_ptr[vec]) points to the data;
the other pointer (accessible as vec_len[vec]) encodes the length of the array in the pointer. Thus, (size_t)vec_len[vec] returns the len as size_t.

So, int *vec[2] = { 0 }; is an empty dynamic array of ints. struct person *people[2] = { 0 }; is an empty dynamic array of people.

The vec_push(vec, value) macro pushes a value at the end of a dynamic array. It returns true if pushing succeeded, and false otherwise. Note that the dynamic array is not automatically freed on failure.

Terminals should generate the 256-color palette from the user's base16 theme.

If you've spent much time in the terminal, you've probably set a custom base16 theme. They work well. You define a handful of colors in one place and all your programs use them.

The drawback is that 16 colors is limiting. Complex and color-heavy programs struggle with such a small palette.

SQLite was thought of as a toy for many years until we all realized it was actually nice to use a database as a library, even server-side. And yet...

It's a big dependency, despite what you think. In no universe is 150,000 lines of C code "lightweight".
Like with all SQL databases, you have an impedance mismatch: the way you store data in memory is completely different than the table structure a SQL database forces on you, leading to tons of glue code.
It's mutable, so it can't undo or time travel, and it can't read while a write is happening (even in WAL mode...reads can't happen during checkpointing!).

To solve these problems, I'm building a database called xitdb:

At only about 4,000 lines of code with no dependencies, xitdb is actually lightweight. You could reimplement it in another language pretty easily.
It exposes rich data structures rather than a SQL interface, so the API is very similar to the in-memory data structures you already use in your program.

hi, i'm daniel. i'm a 15-year-old high school junior. in my free time, i hack billion dollar companies and build cool stuff.

3 months ago, I discovered a unique 0-click deanonymization attack that allows an attacker to grab the location of any target within a 250 mile radius. With a vulnerable app installed on a target's phone (or as a background application on their laptop), an attacker can send a malicious payload and deanonymize you within seconds--and you wouldn't even know.

I'm publishing this writeup and research as a warning, especially for journalists, activists, and hackers, about this type of undetectable attack. Hundreds of applications are vulnerable, including some of the most popular apps in the world: Signal, Discord, Twitter/X, and others. Here's how it works:

Cloudflare

By the numbers, Cloudflare is easily the most popular CDN on the market. It beats out competitors such as Sucuri, Amazon CloudFront, Akamai, and Fastly. In 2019, a major Cloudflare outage k

Organize Images into folders using AI

This is a tool that sorts images into folders using "AI". You create the folders you want the images to be put into.

I got 'claude' to write with a couple prompts. Make venv and install deps with pip.

Use microsoft/git-large-coco To turn images into short descriptions of images - https://huggingface.co/microsoft/git-large-coco
Use all-MiniLM-L6-v2 to turn short descriptions into 'embedding vectors' - https://www.sbert.net/docs/sentence_transformer/pretrained_models.html
Compare the embedding vector of the image, with the embedding vectors of the folders - choose the best folder to put the image into

	# Owning binary : TextComposerRuntime
	# Status : NEW in iOS 27 (not in 26.5.1)
	# Source : embedded __cstring in dyld_shared_cache_arm64e (24A5355q)
	======================================================================

	# Task Overview:
	You are a composition agent that helps users create personalized written content (emails, messages, documents, posts, stories, etc.)

	As an Assistant, you must:
	1. Analyze the request to determine if you have sufficient information

	// Final CRT shader with all effects including curvature

	uniform float scanlineIntensity; // Adjust intensity (0-1)
	uniform float scanlineCount; // Number of scanlines
	uniform float time; // For flicker effect
	uniform float yOffset; // Vertical drift to combat moiré pattern
	uniform float brightness; // Overall brightness
	uniform float contrast; // Contrast adjustment
	uniform float saturation; // Color saturation
	uniform float bloomIntensity; // Bloom effect intensity

	<div style="position:absolute;top:-999px;left:-999px">
	<svg
	id="effectSvg"
	width="200"
	height="200"
	viewBox="0 0 200 200"
	xmlns="http://www.w3.org/2000/svg">


	<filter id="displacementFilter4">

	// SPDX-FileCopyrightText: 2024 Arntzen Software AS
	// SPDX-FileContributor: Hans-Kristian Arntzen
	// SPDX-FileContributor: Runar Heyer
	// SPDX-License-Identifier: LGPL-3.0+

	// Simplified header for standalone demo purposes :)

	#pragma once

	#include <stdint.h>