#实现ls的基础功能（用stat检索文件信息）

#include <stddef.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <stdlib.h>
#include <string.h>
#include  <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <pwd.h>
int main(int argc, char **argv[])
{
    int fa;
    struct stat myls;
    uid_t uid;

    if(stat(argv[1],&myls)<0)
    {
        printf("stat failed!\n");
        exit(-1);
    }
    if(S_ISREG(myls.st_mode))
    {
        printf("pu tong wen jian!");
    }
    if(S_ISDIR(myls.st_mode))
    {
        printf("d");
    }
    if(S_ISCHR(myls.st_mode))
    {
        printf("zi fu she bei");
    }
    if(S_ISBLK(myls.st_mode))
    {
        printf("kuai she bei");
    }
    printf(" ");
    if(myls.st_mode & S_IRUSR)//判断权限
    {
        printf("r ");
    }
    printf("%d ",myls.st_nlink);//硬链接

    printf("%s",ctime(&(myls.st_mtim)));//时间转换
    struct passwd * yuan=getpwuid(myls.st_uid);
    printf("%s",yuan->pw_name);

}