递归遍历目录下的所有文件，并打印文件名字

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.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);
stat(entry-> d_name, &statbuf);

if (S_ISDIR(statbuf.st_mode)) {
/* ignore . and .. */
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(int argc, char* argv[])
{
char *topdir, pwd[2] =".";

if (argc != 2)
topdir=pwd;
else
topdir=argv[1];

printf("********************Directory scan of %s***********************/n", topdir);
printdir(topdir, 0);
printf("**************************done.********************************/n ");
exit(0);
}