ljmccarthy

/*
 * primesieve
 *
 * Prints out a list of prime numbers using the Sieve of Eratosthenes.
 * 
 * Luke McCarthy 2023-09-28
 */

#include <stdio.h>

ljmccarthy

# Variable-size integer encoding
# Uses the same encoding format as Google's Protocol Buffers described here:
# http://code.google.com/apis/protocolbuffers/docs/encoding.html#varints
# However this code supports arbitrarily large integers instead of fixed 32/64-bit.

def encode_varint(n):
    chars = []
    while n > 0x7f:
        chars.append(chr(0x80 | (n & 0x7f)))
        n >>= 7

ljmccarthy

#include <stdio.h>
#include <inttypes.h>
#include <SDL2/SDL.h>

int main()
{
	SDL_Init(SDL_INIT_VIDEO);
	SDL_Window *window = SDL_CreateWindow("SDL Test", 0, 0, 320, 240, SDL_WINDOW_SHOWN);
	SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
	SDL_Texture *texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STATIC, 8, 8);

ljmccarthy

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

uint32_t umul32(uint32_t a, uint32_t b)
{
    if (a < b) {
        uint32_t tmp = a;
        a = b;
        b = tmp;

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 = [email protected]
[init]
	defaultBranch = main
[pull]
	ff = only
	rebase = true
	autoStash = true
[fetch]