/*************************************************************************  > File Name: treedir.c  > Author: KrisChou  > Mail:zhoujx0219@163.com   > Created Time: Tue 19 Aug 2014 05:04:50 PM CST ************************************************************************/#include <stdio.h>#include <sys/types.h>#include <dirent.h>#include <unistd.h>#include <string.h>#include <stdlib.h>#include <sys/stat.h>void print_tree(char* dirname, int spc_cnt);int main(int argc, char* argv[])// ./main dir{    if(argc == 1)    {        print_tree(".", 0);    }else if(argc == 2)    {        print_tree(argv[1], 0);    }    return 0 ;}void print_tree(char* dirname, int spc_cnt){    DIR* pdir ;                       //目录指针    struct dirent* pent ;             //可以获取目录下子项d_name的结构体指针    struct stat my_stat ;             //根据绝对路径，获取文件信息的结构体                   char old_path[128]="";            //保存原来的工作路径             getcwd(old_path, 128);                    pdir = opendir(dirname);          //打开目录    if(pdir == NULL)    {        perror("opendir");        exit(1);    }        chdir(dirname);                   //切换到需要遍历的目录        while((pent = readdir(pdir)) != NULL)    {        if(strncmp(pent ->d_name, ".", 1) == 0 || strncmp(pent->d_name,"..", 2) == 0)        {            continue ;        }                memset(&my_stat, 0 , sizeof(my_stat));        if(stat(pent ->d_name, &my_stat) == -1)        {            perror("stat");            exit(1);        }                if(S_ISDIR(my_stat.st_mode))        {            printf("%*s%s\n",spc_cnt," ",pent ->d_name);            print_tree(pent ->d_name, spc_cnt + 5);        }else         {            printf("%*s%s\n",spc_cnt," ",pent ->d_name);        }    }        closedir(pdir);    chdir(old_path); //程序结束切换回原来的目录}