so2 nth char from each file in a dir

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

#define BUFF_SIZE (1 << 10)

void printNthChar(const char path[], int n) {
    int fd = open(path, O_RDONLY);
    if (fd < 0) {
        perror("");
        exit(1);
    }

    char buffer[BUFF_SIZE];
    int totalRead = 0, bytesRead, ok = 0;
    while ((bytesRead = read(fd, buffer, BUFF_SIZE)) > 0) {
        for (ssize_t i = 0; i < bytesRead; ++i) {
            totalRead++;
            if (totalRead == n) {
                printf("The %d-th character is: '%c'\n", n, buffer[i]);
                ok = 1;
                break;
            }
        }
        if (ok) {
            break;
        }
    }

    if (bytesRead == -1) {
        perror("");
        exit(1);
    }

    if (close(fd)) {
        perror("close");
    }
}

void iterateDir(const char path[], int n) {
    DIR *dir = opendir(path);
    if (dir == NULL) {
        perror("");
        exit(1);
    }

    for (struct dirent *dep; (dep = readdir(dir)) != NULL;) {
        const char *const dName = dep->d_name;
        if (!strcmp(dName, ".") || !strcmp(dName, "..")) {
            continue;
        }
        char absPath[BUFF_SIZE];
        sprintf(absPath, "%s/%s", path, dName);

        struct stat statBuff;
        if (lstat(absPath, &statBuff)) {
            perror("");
            exit(1);
        }

        const mode_t mode = statBuff.st_mode;
        if (S_ISDIR(mode)) {
            iterateDir(absPath, n);
        } else if (S_ISREG(mode)) {
            printf("%s\n", absPath);
            off_t size = statBuff.st_size;
            if (size < n) {
                puts("OUT_OF_BOUNDS!");
            } else {
                printNthChar(absPath, n);
            }
        }
    }

    if (closedir(dir) != 0) {
        perror("closedir");
    }
}

int main(int argc, char *argv[]) {
    if (argc != 3) {
        fprintf(stderr, "Wrong usage!\n");
        exit(1);
    }
    int n = atoi(argv[2]);
    iterateDir(argv[1], n);
    return 0;
}