2023-day-p2.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>


int main(void)
{
	FILE *f;
	unsigned long total = 0;

	f = fopen(__FILE__ ".txt", "rb");
	if(!f)
	{
		fprintf(stderr, "idiot\n");
		return 0;
	}

	while(1)
	{
		char buf[256];
		int i, game, red, green, blue;
		char *p, *s;

		if(!fgets(buf, 256, f))
			break;
		if(buf[0] == '\n' || buf[0] == '\r')
			break;
		*strchr(buf, '\r') = 0;
		if(memcmp(buf, "Game ", 5) != 0)
			break;

		p = buf + 5;
		game = strtol(p, &p, 10);
		p += 2;

		i = strtol(strtok(p, ",; "), NULL, 10);
		p = strtok(NULL, ",; ");

		red = 0;
		green = 0;
		blue = 0;

		while(1)
		{
			if(memcmp(p, "red", 3) == 0 && i > red)
				red = i;
			if(memcmp(p, "green", 5) == 0 && i > green)
				green = i;
			if(memcmp(p, "blue", 4) == 0 && i > blue)
				blue = i;


			p = strtok(NULL, ",; ");
			if(!p)
				break;
			i = strtol(p, NULL, 10);
		
			p = strtok(NULL, ",; ");
			if(!p)
				break;
		}

		printf("Game %d, RGB: %d %d %d\n", game, red, green, blue);
		total += (red * green * blue);
	}

	printf("\nTotal: %lu\n", total);

	return 0;
}