C Program using the I/O system calls of UNIX/LINUX operating system

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

void list_directory(const char *path) {
    struct dirent *entry;    // Struct for directory entries
    struct stat fileStat;    // Struct for file information
    DIR *dir = opendir(path);  // Open directory

    if (dir == NULL) {
        perror("Error opening directory");
        exit(1);
    }

    printf("\nContents of directory: %s\n", path);
    printf("---------------------------------------------\n");
    printf("Filename\tSize (bytes)\tLast Modified\n");
    printf("---------------------------------------------\n");

    while ((entry = readdir(dir)) != NULL) {
        char fullpath[1024];
        snprintf(fullpath, sizeof(fullpath), "%s/%s", path, entry->d_name);

        // Get file statistics
        if (stat(fullpath, &fileStat) == -1) {
            perror("Error getting file info");
            continue;
        }

        // Print filename, size, and last modified time
        printf("%-15s %-10ld %s", entry->d_name, fileStat.st_size, ctime(&fileStat.st_mtime));
    }

    closedir(dir);  // Close directory
}

int main() {
    char directory[256];
    
    printf("Enter directory path: ");
    scanf("%s", directory);

    list_directory(directory);

    return 0;
}

# EXAMPLE OUTPUT:
Enter directory path: .

Contents of directory: .
---------------------------------------------
Filename        Size (bytes)    Last Modified
---------------------------------------------
file1.txt       1024           Mon Mar 4 12:30:10 2024
script.sh       512            Sun Mar 3 18:45:30 2024
my_program      20480          Sat Mar 2 10:15:20 2024