Christopher Wellons skeeto

uint64_t dualmix128(uint64_t s[2])
{
    uint64_t m = s[0] + s[1];
    s[0] = m + (s[0]<<26 | s[0]>>38);

uint64_t dualmix128(uint64_t s[2])
{
    uint64_t m = s[0] + s[1];
 s[0] = m + (s[0]&lt;&lt;26 | s[0]&gt;&gt;38);

	// https://old.reddit.com/r/C_Programming/comments/1l1hxeu
	#include <assert.h>
	#include <stddef.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>

	#define S(s) (Str){s, sizeof(s)-1}

	typedef struct {

	// Requires GNU C23: GCC >= 15 or Clang >= 21

	#define affirm(c) while (!(c)) __builtin_unreachable()
	#define lenof(a) (iz)(sizeof(a) / sizeof(*(a)))
	#define new(a, n, t) (t *)alloc(a, n, sizeof(t), _Alignof(t))
	#define maxof(t) ((t)-1<1 ? (((t)1<<(sizeof(t)8-2))-1)2+1 : (t)-1)
	#define S(s) (Str){(u8 *)s, lenof(s)-1}

	typedef unsigned char u8;
	typedef int i32;

	#include <stdint.h>

	// Return the RGB value of the named color. Does not validate that the
	// input matches a real color name.
	int32_t svg2rgb(char *s)
	{
	static int32_t t[1024] = {
	[ 0]=0x9acd32, [ 4]=0xa9a9a9, [ 16]=0x808080, [ 18]=0xda70d6,
	[ 21]=0x40e0d0, [ 26]=0xffe4b5, [ 27]=0xf5fffa, [ 29]=0xa0522d,
	[ 38]=0xfaf0e6, [ 41]=0x2f4f4f, [ 43]=0x6a5acd, [ 55]=0xb22222,

	// Single consumer, single producer circular buffer using Win32 SRW
	// Ref: https://github.com/vibhav950/cbuf
	// Ref: https://old.reddit.com/r/C_Programming/comments/1jwnlrf
	// Ref: https://nullprogram.com/blog/2024/10/03/
	#include <stddef.h>
	#include <stdint.h>
	#include <string.h>

	typedef uint8_t u8;
	typedef int32_t b32;

	#!/bin/sh
	set -ex
	clang --target=wasm32 -nostdlib -O2 -fno-builtin -Wl,--no-entry -o staz.wasm wasm.c

	!profile claude
	!user
	Please give me an example of using WASI `path_open` to open a file for writing. In particular, I don't know where to get the `dirfd` parameter.

	!assistant

	# Example of using WASI `path_open` to open a file for writing

	The WASI `path_open` function requires a directory file descriptor (`dirfd`) as its first parameter because WASI uses a capability-based security model. Here's how to use it:

	// Robust Lock: if a "thread" exits while holding a lock, it is unlocked
	// linux $ cc -pthread example.c
	// w64dk $ cc example.c -lntdll
	// Ref: https://old.reddit.com/r/C_Programming/comments/1jd82ux
	// Ref: https://github.com/cozis/timestamp_lock
	// This is free and unencumbered software released into the public domain.
	#include <assert.h>
	#include <stddef.h>
	#include <stdint.h>
	#include <stdio.h>