linux 编程实现ls -l

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

void print_file_info(const char *path) {
    struct stat fileStat;
    if(stat(path, &fileStat) < 0)    {
        perror("Error getting file stats");
        return;
    }

    printf((S_ISDIR(fileStat.st_mode)) ? "d" : "-");
    printf((fileStat.st_mode & S_IRUSR) ? "r" : "-");
    printf((fileStat.st_mode & S_IWUSR) ? "w" : "-");
    printf((fileStat.st_mode & S_IXUSR) ? "x" : "-");
    printf((fileStat.st_mode & S_IRGRP) ? "r" : "-");
    printf((fileStat.st_mode & S_IWGRP) ? "w" : "-");
    printf((fileStat.st_mode & S_IXGRP) ? "x" : "-");
    printf((fileStat.st_mode & S_IROTH) ? "r" : "-");
    printf((fileStat.st_mode & S_IWOTH) ? "w" : "-");
    printf((fileStat.st_mode & S_IXOTH) ? "x" : "- ");
    printf("%ld ", fileStat.st_nlink);
    printf("%s ", getpwuid(fileStat.st_uid)->pw_name);
    printf("%s ", getgrgid(fileStat.st_gid)->gr_name);
    printf("%ld ", fileStat.st_size);
    printf("%.12s ", 4 + ctime(&fileStat.st_mtime));
    printf("%s\n", path);
}

int main(int argc, char *argv[]) {
    DIR *dir;
    struct dirent *entry;

    if(argc != 2) {
        fprintf(stderr, "Usage: %s <directory>\n", argv[0]);
        return EXIT_FAILURE;
    }

    if((dir = opendir(argv[1])) == NULL) {
        perror("Error opening directory");
        return EXIT_FAILURE;
    }

    while((entry = readdir(dir)) != NULL) {
        char path[1024];
        snprintf(path, sizeof(path), "%s/%s", argv[1], entry->d_name);
        print_file_info(path);
    }

    closedir(dir);
    return EXIT_SUCCESS;
}