ljmccarthy

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

int main(void)
{
    union { uint8_t bytes[4]; uint32_t value; } x = { .bytes = {0x11, 0x22, 0x33, 0x44} };
    switch (x.value) {
        case 0x11223344:
            printf("big\n");
            return 0;

ljmccarthy

#!/bin/sh
#
# Run C programs for fun!
#
# Disables all optimizations, enables warnings, debug info and some hardening options.
#
if [ $# -lt 1 ]; then
    echo "usage: $0 FILE.c"
    exit 1
fi

ljmccarthy

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <math.h>

#define RGB(r,g,b) (((r) & 0xFF) | (((g) & 0xFF) << 8) | (((b) & 0xFF) << 16))
#define RED(rgb) ((rgb) & 0xFF)
#define GRN(rgb) (((rgb) >> 8) & 0xFF)
#define BLU(rgb) (((rgb) >> 16) & 0xFF)

ljmccarthy

#!/bin/sh
GCC_O0_OPTS_DISABLED=$(gcc -Q -O0 --help=optimizers | awk -v ORS=" " '($1 ~ /^-f/) && ($2 ~ /enabled/) {print "-fno-" substr($1,3)}')
exec gcc -O0 $GCC_O0_OPTS_DISABLED "$@"

ljmccarthy

objdump -d /usr/bin/* | cut -f3 | grep -oE ^[a-z]+ | sort | uniq -c | sort -nr

ljmccarthy

[user]
	name = Your Name
	email = your.email@example.com
[init]
	defaultBranch = main
[pull]
	ff = only
	rebase = true
	autoStash = true
[fetch]

ljmccarthy

# The world's stupidest HTTP server
def http_serve_data(data, bind_address, bind_port):
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
        sock.bind((bind_address, bind_port))
        sock.listen()
        conn, addr = sock.accept()
        with conn:
            conn.recv(1024) # Read and discard request
            conn.sendall(b'HTTP/1.1 200 OK\r\nContent-Type: application/octet-stream\r\nContent-Length: ' + str(len(data)).encode('ascii') + b'\r\n\r\n')
            conn.sendall(data)

ljmccarthy

# Fowler–Noll–Vo hash function
# https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function

fnv_prime_32 = 2**24 + 2**8 + 0x93
offset_basis_32 = 0x811c9dc5

def fnv1a_hash_32(bs):
    r = offset_basis_32
    for b in bs:
        r = r ^ b

ljmccarthy

format ELF64 executable 3

segment readable executable

entry $
    mov eax, 1                      ; sys_write
    mov edi, 1                      ; fd = STDOUT_FILENO
    mov rsi, message                ; buf
    mov rdx, message.end - message  ; count
    syscall

ljmccarthy

powercfg /batteryreport /output "C:\battery_report.html"