AdventOfCode/C/2015/Day_3/main.c

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

#define IMP
#include "../../file.h"
#include "../../str.h"

#define BL_MIN(v1, v2) ((((v1) >= (v2)) * (v2)) + (((v1) < (v2)) * (v1)))
#define BL_MAX(v1, v2) ((((v1) >= (v2)) * (v1)) + (((v1) < (v2)) * (v2)))

struct point {
	long x, y;
};

int
main(int argc, char *argv[])
{
	enum file_err ferr;
	long res = 0;

	size_t i = 0;
	size_t j = 0;

	struct point p = {0};
	struct point *points = NULL;
	size_t points_size = 1;

	struct str str_input = {0};

	char *raw_input = NULL;
	size_t raw_input_size = 0;

	raw_input = (char *) file_read_all("./input.txt", 
					   &raw_input_size,
					   &ferr);
	if ( ferr != FILE_ERR_OK ) {
		fprintf(stderr, "Failed to open file: %s\n", 
			file_err_to_cstr(ferr));
		exit(EXIT_FAILURE);
	}

	str_input = str_from_cstr(raw_input, raw_input_size);

	points = calloc(str_input.size + 1, sizeof(*points));

	{
		for ( i = 0; i < str_input.size; ++i ) {
			struct point *it = (points + i + 1);
			p = points[i];

			*it = p;
			switch ( str_input.data[i] ) {
			case '>':
				++it->x;
				break;
			case '^':
				--it->y;
				break;
			case '<':
				--it->x;
				break;
			case 'v':
				++it->y;
				break;
			}
			++points_size;
		}
	}

	if ( argc == 1 ) {
		struct point *uniqs = NULL;
		size_t uniqs_size = 0;
		uniqs = calloc(points_size, sizeof(*uniqs));

		for ( i = 0; i < points_size; ++i ) {
			p = points[i];
			for ( j = 0; j < uniqs_size; ++j ) {
				if ( uniqs[j].x == p.x && uniqs[j].y == p.y ) {
					goto outer_continue;
				}
			}
			uniqs[uniqs_size++] = p;
outer_continue:		;
		}

		res = (long) uniqs_size;

		free(uniqs);
	} else {
	}

	printf("Result: %ld\n", res);

	free(points);

	free(raw_input);

	(void) argc; (void) argv;
	return 0;
}