linux环境c/c++实现ls,ls -l

My_ls.cpp

//============================================================================
// Name        : Hellocpp.cpp
// Author      : lingo
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

#include <iostream>
#include <ctime>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <dirent.h>
#include <sys/stat.h>
#include <string.h>
#include <unistd.h>
using namespace std;
char filename[100][255]; 		//存储文件名字符串
int filenum = 0;
// 将文件权限描述id转换为读写权限字符
void stmode_to_rwx(int mode, char str[]){
    strcpy(str, \"----------\");
    if (S_ISDIR(mode)) str[0] = \'d\';
    if (S_ISCHR(mode)) str[0] = \'c\';
    if (S_ISBLK(mode)) str[0] = \'b\';
    if ((mode & S_IRUSR)) str[1] = \'r\';
    if ((mode & S_IWUSR)) str[2] = \'w\';
    if ((mode & S_IXUSR)) str[3] = \'x\';
    if ((mode & S_IRGRP)) str[4] = \'r\';
    if ((mode & S_IWGRP)) str[5] = \'w\';
    if ((mode & S_IXGRP)) str[6] = \'x\';
    if ((mode & S_IROTH)) str[7] = \'r\';
    if ((mode & S_IWOTH)) str[8] = \'w\';
    if ((mode & S_IXOTH)) str[9] = \'x\';
}
int ls_dir(char *dirpath){
	DIR *d;                     //DIR *opendir(const char *pathname)，目录的返回结构体指针
	struct dirent *dirfile;		//用该结构体保存目录项
	struct stat dirfileinfo;	//目录项描述结构体
	if(!(d = opendir(dirpath))){
		printf(\"error opendir %s\\n\",dirpath);
		return -1;
	}
	while((dirfile = readdir(d))!= NULL){
		// 过滤.xx目录项
		if(strncmp(dirfile->d_name, \".\", 1) == 0)
			continue;
		stat(dirfile->d_name,&dirfileinfo);
		cout<<dirfile->d_name<<\" \";
	}
	cout<<endl;
	closedir(d);
	return 1;
}
int ls_l_dir(char *dirpath){
	DIR *d;                     //DIR *opendir(const char *pathname)，目录的返回结构体指针
	struct dirent *dirfile;		//用该结构体保存目录项
	struct stat dirfileinfo;	//目录项描述结构体
	if(!(d = opendir(dirpath))){
		printf(\"error opendir %s\\n\",dirpath);
		return -1;
	}
	struct passwd *userinfo;
	struct group *groupinfo;
	while((dirfile = readdir(d))!= NULL){
		// 过滤.xx目录项
		if(strncmp(dirfile->d_name, \".\", 1) == 0)
			continue;
		strcpy(filename[filenum++],dirfile->d_name); //存储目录项名称
		stat(dirfile->d_name,&dirfileinfo); //得到指定文件名的描述信息
		userinfo = getpwuid(dirfileinfo.st_uid);
		groupinfo = getgrgid(dirfileinfo.st_gid);
		char dirauth[11];
		stmode_to_rwx(dirfileinfo.st_mode,dirauth);
		cout<<dirauth<<\" \" <<dirfileinfo.st_nlink<<\" \"<< userinfo->pw_name<<\" \"<<groupinfo->gr_name<<\" \"<<dirfileinfo.st_size<<\" \";
		printf(\" %.12s\", 4 + ctime(&dirfileinfo.st_mtime));
		cout<<\" \"<<dirfile->d_name;
		cout<<endl;
	}
	closedir(d);
	return 1;
}
int main(int args,char* argv[]) {
	char pwddir[255];  	//存储当前工作环境下绝对路径
	getcwd(pwddir,255);	//得到当前工作环境绝对路径
	if( args > 1){
//printf(\"your command : ./ %s,%s\",argv[0],argv[1]);
		int i =2;
		if(memcmp(argv[1],\"-l\",i)==0){
			ls_l_dir(pwddir);     //遍历当前工作环境路径下
		}else{
			printf(\"Usage:%s -l \\n\",argv[0]);
		}
	}else{
		ls_dir(pwddir);
	}
	return 0;
}

ubuntu环境下编译执行后结果：