skeeto

// Parse /proc/meminfo into a hash map
// This is free and unencumbered software released into the public domain.
#include <fcntl.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

skeeto

// Advent of Code 2023 Day 15
// https://adventofcode.com/2023/day/15
// https://nrk.neocities.org/articles/aoc23
// This is free and unencumbered software released into the public domain.
#include <stddef.h>
#include <string.h>

#define assert(c)     while (!(c)) *(volatile int *)0 = 0
#define new(a, t, n)  (t *)alloc(a, sizeof(t)*n)

skeeto

// Gradual-commit arena demonstration
// This is free and unencumbered software released into the public domain.
#include <stddef.h>
#include <string.h>

static void *os_reserve(ptrdiff_t);
static _Bool os_commit(void *, ptrdiff_t);

#define ARENA_PAGESIZE ((ptrdiff_t)1<<26)

skeeto

// $ cc -mwindows stretchdibits.c
#include <windows.h>

enum {
    WIDTH = 1280,
    HEIGHT = 720,
};

static unsigned char *pixels;

skeeto

#include <stddef.h>
#include <stdint.h>

#define assert(c)    while (!(c)) *(volatile int *)0 = 0
#define countof(a)   (size)(sizeof(a) / sizeof(*(a)))
#define new(a, t, n) (t *)alloc(a, sizeof(t), _Alignof(t), n)

typedef int32_t   b32;
typedef uint32_t  u32;
typedef uint64_t  u64;

skeeto

skeeto

#define _GNU_SOURCE
#include <assert.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>

skeeto

#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <windows.h>

#define new(a, t, n)  (t *)alloc(a, sizeof(t)*n)

typedef struct {
    char *beg, *end;
} arena;

skeeto

enum {
    BASE = 1000000000,  // nine decimals per limb
    NUMCAP = 1<<16,     // capacity just over a half million decimals
};

typedef struct {
    int *digits;
    int  len;
} num;

skeeto

#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#define assert(c)  while (!(c)) *(volatile int *)0 = 0
#define new(a, t)  (t *)alloc(a, sizeof(t))

typedef struct {
    char *beg, *end;