linux 基础代码学习－－文件目录的显示

编写show_dir.c

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


void printdir(char *dir,int depth)
{
        DIR *dp;
        struct dirent *entry;
        struct stat statbuf;

        if((dp = opendir(dir)) == NULL){
                fprintf(stderr,"cannot open directory: %s\n",dir);
                return;
        }
        chdir(dir);
        while((entry = readdir(dp))!= NULL){
                lstat(entry->d_name,&statbuf);
                if(S_ISDIR(statbuf.st_mode)){

                        if(strcmp(".",entry->d_name)==0|| strcmp("..",entry->d_name)==0)
                                continue;
                        printf("%*s%s/\n",depth,"",entry->d_name);

                        /* recurse at a new indent level */
                        printdir(entry->d_name,depth+4);
                }
                else printf("%*s%s/\n",depth,"",entry->d_name);
        }
        chdir("..");
        closedir(dp);

}

int main(int argc,char* argv[]){
        char *topdir = ".";
        if(argc>=2)
                topdir= argv[1];
        printf("Directory scan of %s\n",topdir);
        printdir(topdir,0);
        printf("done.\n");

        exit(0);
}

编译脚本：
gcc -o show_dir show_dir.c

执行脚本：
./show_dir /home/mingjie