linux下利用系统函数实现rm -rf的功能！

#include<stdio.h>
#include<sys/types.h>
#include<dirent.h>
#include<stdlib.h>
void removedir(char* dir);
void removefile(char *name)//remove file and empty dir
{
DIR *d;
if ((d = opendir(name)) == NULL)
{
printf("file:%s is moved!\n", name);
unlink(name);
}
else if ((rmdir(name)) == 0)
printf("dir:%s is moved!\n", name);
else
{
printf("dir name:%s\n", name);
removedir(name);
}
}

void removedir(char* dir)//check the dir
{
struct dirent *dp;
DIR *d;
char bb[100] = "";
d = opendir(dir);
getcwd(bb, 100);
while((dp = readdir(d)) != NULL)
{
if (strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0)
continue;
chdir(dir);
printf("\nfind :%s\n", dp->d_name);
removefile(dp->d_name);
}
closedir(d);
chdir(bb);
removefile(dir);
printf("%s is moved!\n", dir);
}

int main(int argc, char* argv[])
{
if (argc < 2)
{
printf("./app file or dir!\n");
exit(1);
}
removefile(argv[1]);
printf("remove successful\n!");
return 0;
}