文件系统学习营

【文件系统学习】+DMY+任务2 文件匹配

发布于 2018-07-17 10:11:43 浏览：1677 订阅该版

a.开发环境：RT-Thread源码+ENV工具+Source Insight 4.0
完成任务的前提：
（1）已经对RTT内核熟悉，了解基本操作，可以在荔枝微课中观看15入门视频学习。
（2）熟悉ENV基本操作，可以在网易云课堂中搜索ENV教学视频。
b.过程及结果：
任务2.文件匹配：有一系列文件如：1.txt，12.txt，123.txt，从中找出1.txt
       任务2可以更据ls命令改编，改编思路为，在列出当前文件夹中文件时与输入的文件比较，若与输入的文件名相同则，说明匹配成功打印This Directory has the specifiedfile 若没有匹配的文件则打印check_file failure  
具体文件如下，在之前的工程下修改用Source Insight修改main。

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <dfs.h>
#include <dfs_file.h>
#include <dfs_private.h>

int main(void)
{
 printf("hello rt-thread ");

return 0;
}

static struct dfs_fd fd;
static struct dirent dirent;

void check_file(int argc, char **argv)
{
    struct stat stat;
    int length;
    char *fullpath, *path;
        char *pathname;
        int temp=0;
    fullpath = NULL;

if ((argc < 1)&&(argc > 3)) return ;

if (pathname == NULL)
    {
#ifdef DFS_USING_WORKDIR
        /* open current working directory */
        path = rt_strdup(working_directory);
#else
        path = rt_strdup("/");
#endif
        if (path == NULL)
            return ; /* out of memory */
    }
    else
    {
        path = (char *)pathname;
    }

/* list directory */
 if (dfs_file_open(&fd, path, O_DIRECTORY) == 0)
 {
 rt_kprintf("Directory %s: ", path);
 do
 {
 memset(&dirent, 0, sizeof(struct dirent));
 length = dfs_file_getdents(&fd, &dirent, sizeof(struct dirent));
 if (length > 0)
 {
 memset(&stat, 0, sizeof(struct stat));

/* build full path for each file */
                fullpath = dfs_normalize_path(path, dirent.d_name);
                if (fullpath == NULL)
                    break;

if (dfs_file_stat(fullpath, &stat) == 0)
 {
 // rt_kprintf("%-20s", dirent.d_name);
 if (0 == strcmp(argv[1], dirent.d_name))
 {
 rt_kprintf("This Directory has the specified file \"%s\". ", dirent.d_name);
 temp=1;
 dfs_file_close(&fd);
 return ;
 }

}
 else
 rt_kprintf("BAD file: %s ", dirent.d_name);
 rt_free(fullpath);
 }
 }while(length > 0);
 if(temp==0) rt_kprintf("check_file failure \"%s\" ",argv[1]);
 dfs_file_close(&fd);
 }
 else
 {
 rt_kprintf("No such directory ");
 }
 if (pathname == NULL)
 rt_free(path);
}
MSH_CMD_EXPORT(check_file, check one file contain in the current directory);

修改使用scons编译，qemu.bat运行后实验现象如图：

![600,0](https://oss-club.rt-thread.org/uploads/201807/14/031709ih6h4g467i4pmmgr.png)
 
以上任务2完成