skeeto

// WriteProcessMemory demo
// $ cc -nostartfiles -o demo.exe demo.c
// $ cl demo.c /link /subsystem:console kernel32.lib
// This is free and unencumbered software released into the public domain.
#include <stddef.h>

#define countof(a) (ptrdiff_t)(sizeof(a) / sizeof(*(a)))

typedef unsigned char      u8;
typedef   signed int       b32;

skeeto

// Summarize a numeric sequence
// Ref: https://old.reddit.com/r/commandline/comments/11hw06b
// Ref: https://github.com/ahmedakef/summarize
// This is free and unencumbered software released into the public domain.
#include <float.h>
#include <stdio.h>
#include <stdlib.h>

typedef struct { 
    double sum, err;

skeeto

// Function hotpatch example
// $ gcc -nostartfiles -o hotpatch.exe hotpatch.c
// $ clang -nostdlib -Wl,/subsystem:console -o hotpatch.exe hotpatch.c -lkernel32
// This is free and unencumbered software released into the public domain.
#include <stddef.h>
#include <stdint.h>
#define W32 __attribute((dllimport, stdcall))
W32 void *CreateThread(void *, size_t, void *, void *, int, int *);
W32 int   FlushInstructionCache(void *, void *, size_t);
W32 void *GetStdHandle(int);

skeeto

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

#define assert(c)     while (!(c)) *(volatile int *)0 = 0
#define countof(a)    (ptrdiff_t)(sizeof(a) / sizeof(*(a)))
#define new(a, t, n)  (t *)alloc(a, sizeof(t), n)
#define S(s)          (str){(char *)s, countof(s)-1}

skeeto

// Ref: https://github.com/lionkor/logkeys-cleanup
#include <stdio.h>

typedef struct trie trie;
struct trie {
    trie *child[256];
    _Bool terminal;
};

static void insert(trie *t, char *word, trie **heap)

skeeto

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

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

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

skeeto

/* EnumSet benchmark
 * $ javac Benchmark.java
 * $ java -ea Benchmark 
 * Ref: https://nullprogram.com/blog/2021/04/23/
 */
import java.util.Arrays;
import java.util.EnumSet;
import java.util.HashSet;
import java.util.Set;

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

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

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

static unsigned char *pixels;