aoc/src/advent_utility.c

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

#if defined __linux__ || defined __APPLE__

#include <openssl/md5.h>

#else
#include <md5.h>
#endif

#include "advent_utility.h"

struct Point new_Point(int x, int y) {
    struct Point p;
    p.x = x;
    p.y = y;
    return p;
}

struct Point *new_Point_p(int x, int y) {
    struct Point *p = malloc(sizeof(struct Point));
    p->x = x;
    p->y = y;
    return p;
}

int same_Point(const struct Point *a, const struct Point *b) {
    if (a->x == b->x && a->y == b->y) {
        return 1;
    }
    return 0;
}

int same_Point_v(const void *a, const void *b) {
    return same_Point((const struct Point *) a, (const struct Point *) b);
}

char *md5_str(const char *input) {
    unsigned char digest[16];

#if defined __linux__ || defined __APPLE__
    MD5_CTX context;
    MD5_Init(&context);
    MD5_Update(&context, input, strlen(input));
    MD5_Final(digest, &context);
#else
    struct MD5Context context;
    MD5Init(&context);
    MD5Update(&context, input, strlen(input));
    MD5Final(digest, &context);
#endif

    char *md5string = malloc(33);
    for (int i = 0; i < 16; ++i) {
        sprintf(&md5string[i * 2], "%02x", (unsigned int) digest[i]);
    }
    return md5string;
}

char *capture_system(const char *cmd) {
    char *buf = malloc(256);
    FILE *tmp = popen(cmd, "r");
    if (tmp == NULL) {
        printf("failed to open FILE *tmp\n");
        exit(1);
    }
    fgets(buf, 256, tmp);
    return buf;
}