printdir.c

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

void printdir(char *dir, int depth)
{
    DIR *dp;
    struct dirent *entry;
    struct stat statbuf;

    if ((dp = opendir(dir)) == NULL) {
        fprintf(stderr, "Cannot open directory: %s\n", dir);
        return;
    }
    chdir(dir);
    while ((entry = readdir(dp)) != NULL) {
        lstat(entry->d_name, &statbuf);
        if (S_ISDIR(statbuf.st_mode)) {
            if (strcmp(".", entry->d_name) == 0 ||
                strcmp("..", entry->d_name) == 0)
                continue;
            printf("%*s%s/\n", depth, "", entry->d_name);
            printdir(entry->d_name, depth + 4);
        } else {
            printf("%*s%s\n", depth, "", entry->d_name);
        }
    }
    chdir("..");
    closedir(dp);
}

int main()
{
    printf("Directory scan of /home:\n");
    printdir("/home", 0);
    printf("Done.\n");
    exit(0);
}