linux下的c 编程------dir scan

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

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

if((dp=opendir(dir))==NULL)
{
fprintf(2,"can not 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);
}

int main()
{
printf("Directory scan of /home/lzy/prog_c:\n");
printdir("/home/lzy/prog_c",0);
  printf("done!");
exit(0);
}