对目录的操作

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


int count = 0;
int dircount(char *dirname)
{
    //打开目录
   DIR *dirp =  opendir(dirname);
   if(dirp == NULL)
   {   
       perror("opendir err");
       return -1; 
   }   
    //循环读目录，如果是普通文件，count++如果是目录，就绪调用这个函数
    struct dirent *dentp = NULL;
    while((dentp = readdir(dirp))!=NULL) //如果为NULL 代表读到目录末尾
    {   
//        printf("dirname:%s, dtype:%d\n",dentp->d_name,dentp->d_type);
        if(dentp->d_type == DT_DIR) //如果是目录
        {   
            if(strcmp("..",dentp->d_name) == 0|| strcmp(".",dentp->d_name) == 0)
                continue;
    
            //注意进程的工作路径
            char newdirname[256]={0};
            sprintf(newdirname,"%s/%s",dirname,dentp->d_name);
            dircount(newdirname);
        }   
        if(dentp->d_type == DT_REG)
        {   
            //这是普通文件,开始计数
            count++;
        }   
    }   
    
    //关闭目录
    closedir(dirp);
    return 0;
}

int main(int argc,char *argv[])
{
    if(argc != 2)
    {   
        printf("./a.out dirname\n");
        return -1; 
    }   
    dircount(argv[1]);
    printf("count = %d\n",count);                                                                                                
    return 0;
}