// 其实算是抄书上的，ft
// printdir.c

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

void printdir(char *dir, int depth);

int main(int argc, char *argv[])
{
        if (argc!=2) {
                printf("usage: printdir [path]");
                return 0;
        }
        printdir(argv[1],0);
        return 0;
}

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);
                        printdir(entry->d_name,depth+4);
                }
                else printf("%*s%s\n",depth," ",entry->d_name);
        }
        chdir("..");
        closedir(dp);
}


// ps: 近来写东西莫名奇妙会多了点 ":w"，大概是vi上瘾了吧