#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <dirent.h>
#include <sys/types.h>

void traverse(char *path, int indent)
{
    DIR *dir = opendir(path);

    if (dir == NULL)
    {
        fprintf(stderr, "Eroare la deschiderea directorului.\n");
        exit(EXIT_FAILURE);
    }

    struct dirent *d;

    while ((d = readdir(dir)) != NULL)
    {
        if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
            continue;

        if (d->d_type == DT_DIR)
        {
            char buf[256];

            printf("%*s%s\n", indent, "", d->d_name);
            sprintf(buf, "%s/%s", path, d->d_name);

            traverse(buf, indent + 2);
        }
        else
            printf("%*s%s\n", indent, "", d->d_name);
    }
}

int main(int argc, char **argv)
{
    if (argc != 2)
    {
        fprintf(stderr, "Syntax: %s <path>\n", argv[0]);
        exit(EXIT_FAILURE);
    }

    traverse(argv[1], 0);
    return 0;
}