Martin Cejp mcejp

mcejp / serve.sh

Created May 22, 2023 20:51

Jekyll in Podman

	#!/bin/sh
	set -ex

	podman start -ia jekyll \|\| podman run -it \
	--name jekyll \
	--volume=$PWD:/srv/jekyll \
	--env JEKYLL_ENV=production \
	--env JEKYLL_ROOTLESS=1 \
	-p 4000:4000 \
	docker.io/jekyll/jekyll:4.1.0 \

mcejp / aarch64_core_dump.cpp

Last active July 30, 2023 09:54

	/* Copyright (c) 2005-2007, Google Inc.
	* 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

mcejp / saveregister.S

Created July 30, 2023 10:28

Saving registers on Aarch64 in a core-dump-ready format

	.macro saveregister
	// Registers are saved in the following order (see also: user_regs_struct):
	// x0 x1 ... x28 x29 x30 SP PC PSTATE
	// at: -110 -108 ... -30 -28 -20 -18 -10 -08 (hex) with respect to SP-at-entry

	// Start by saving these:
	// [sp, #-0x40] <== x26; x27
	// [sp, #-0x30] <== x28; x29
	stp x26, x27, [sp, #-0x40]
	stp x28, x29, [sp, #-0x30]

mcejp / bsod.php

Created September 14, 2023 12:51

BSOD-style error page in PHP

mcejp / CMakeLists.txt

Created November 4, 2023 09:54

Custom Python step in CMake build

	macro(cmake_path_ABSOLUTE_PATH VARIABLE_NAME)
	if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.20.0")
	cmake_path(ABSOLUTE_PATH ${VARIABLE_NAME})
	else()
	# polyfill for CMake < 3.20
	get_filename_component(${VARIABLE_NAME} ${${VARIABLE_NAME}} ABSOLUTE)
	endif()
	endmacro()

	function(my_build_step SOURCE OUTPUT)

mcejp / ring_buffer.c

Last active May 7, 2025 13:55

Ring buffer with Array + two indices mod 2N

	// Background: https://www.snellman.net/blog/archive/2016-12-13-ring-buffers/
	// Variant with indices modulo 2*capacity as suggested by dizzy57 and Aristotle Pagaltzis

	size_t read;
	size_t write;

	mask(val) { return val % array.capacity; }
	inc(index) { return wrap(index + 1); }
	push(val) { assert(!full()); array[mask(write)] = val; write = inc(write); }
	shift() { assert(!empty()); ret = array[mask(read)]; read = inc(read); return ret; }

mcejp / changelogs.py

Created April 11, 2025 20:45

	import os
	from pathlib import Path

	from openai import OpenAI

	client = OpenAI(
	base_url="https://api.scaleway.ai/v1",
	api_key=os.environ["SCW_SECRET_KEY"]
	)