DavidEGrayson

I'm writing a general-purpose hash table library in C. Given a user-defined struct type named H whose first member is named key, I want the user to be able to use variables of type H* to represent an array of type H, with an associated hash table that allows quick lookups of elements in the array by the value of the key.

The key can be anything. Right now I'm supporting three types of keys:

• arbitary data with a fixed byte size
• a pointer to a null-terminated string
• a size_t followed by a pointer to arbitary data with that size

DavidEGrayson

// This is a small C program that tests your version of vsnprintf to see if it is
// compliant with the C99 standard.
//
// The script gives successful results (compliant vsnprintf) on these environments:
// - MSYS2's MINGW64 environment (GCC 13.2.0)
//
// I also expect successful results on Linux, macOS and modern UCRT-based environments
// provided by Microsoft.
//
// From the MSDN documentation of vsnprintf:

DavidEGrayson

THIS TUTORIAL IS UNDER CONSTRUCTION. I'm updating it to support Pico SDK 2.0.0 and the new RP2 chips!

This is an opinionated tutorial that shows you how to set up a development environment for the RP2 series of microcontrollers (RP2040, RP2350A, RP2350B, RP2354A, RP2354B) on Windows using only open source tools. You should start at the beginning of this tutorial, but you don't have to follow ALL of the instructions: you can stop after completing any level and leave with something that is useful.

Level 0: Set up MSYS2

Download and install [MSYS2], the best system for developing open source software on Windows.

Use "Edit environment variables for your account" in the Windows Control Panel to add an environment variable for your user named HOME with a value like C:\Users\david (but with david replaced by your actual Windows user name). Do NOT add an extra slash on the end. MSYS2 uses this variable to determine where your home directory is. If you don't set it, MSYS2 defaults to using a home

DavidEGrayson

Submodule URL

There are three locations where git keeps track of submodule URL:

1. .gitmodules - This is a regular file that is committed in the repository.
2. .git/config
3. .git/modules/somepath/config

These commands have an effect on the three URLs:

DavidEGrayson

map = ['']
instructions = []
File.foreach('input.txt') do |line|
  md = line.match(/\d/)
  if md
    line.scan(/(\d+|R|L)/) do |m|
      if 'LR'.include?(m[0])
        instructions << m[0].to_sym
      else
        instructions << m[0].to_i

DavidEGrayson

$input = {}
File.foreach('input.txt') do |line|
  if md = line.match(/(\w+): (\d+)/)
    $input[md[1].to_sym] = md[2].to_i
  elsif md = line.match(/(\w+): (\w+) (.) (\w+)/)
    $input[md[1].to_sym] = [md[3].to_sym, md[2].to_sym, md[4].to_sym]
  else
    $stderr.puts "Unrecognized line: #{line}"
    exit 1
  end

DavidEGrayson

$width = 1000
$height = 200
$world = (' ' * $width + "\n") * $height

def coords_in_bounds?(coords)
  (0...$width).include?(coords[0]) && (0...$height).include?(coords[1])
end

def read(coords)
  raise if !coords_in_bounds?(coords)

DavidEGrayson

#!/usr/bin/ruby
# Takes a command line for GCC (or similar) on as a file or on its
# standard input, extracts the preprocessor macros defined and the
# include paths, and outputs them in a format suitable for
# pasting into c_cpp_properties.json so that VSCode can understand
# your C/C++ project better.

require 'json'

input = ARGF.read

DavidEGrayson

diff -ur gcc-11.1.0/gcc/config/host-darwin.c gcc-11.1.0-fixed/gcc/config/host-darwin.c
--- gcc-11.1.0/gcc/config/host-darwin.c	2021-04-27 03:00:13.000000000 -0700
+++ gcc-11.1.0-fixed/gcc/config/host-darwin.c	2021-06-11 14:49:13.754000000 -0700
@@ -22,6 +22,10 @@
 #include "coretypes.h"
 #include "diagnostic-core.h"
 #include "config/host-darwin.h"
+#include "hosthooks.h"
+#include "hosthooks-def.h"
+

DavidEGrayson

diff --git a/code/15_hello_triangle.cpp b/code/15_hello_triangle.cpp
index 532520e..31f2bd7 100644
--- a/code/15_hello_triangle.cpp
+++ b/code/15_hello_triangle.cpp
@@ -642,12 +642,15 @@ private:

     void drawFrame() {
         vkWaitForFences(device, 1, &inFlightFences[currentFrame], VK_TRUE, UINT64_MAX);
+        VkFence waited = inFlightFences[currentFrame];