文件系统学习营

【文件系统学习】- xulishow520 - 文本数据替换

发布于 2018-07-19 23:02:05 浏览：1579 订阅该版

开发环境：env，RT_Thread
![3.png](/uploads/201807/19/230052cuu6ezp13fuwfi1d.png)
执行函数change_data_sample，现象如图，代码如下
static void change_data_sample(void *parameter)
{
    int fd;
    char data[] = "123456789<br>", buffer[80];
    int i,j,num;
    char temp[80],change_temp[]={"abc"};

rt_kprintf("Create Array<br>"); 
    /* 打开/text.txt 作写入，如果该文件不存在则建立该文件*/
    fd = open("1.txt", O_WRONLY | O_CREAT);
    if (fd >= 0)
    {
        write(fd, data, sizeof(data));
        close(fd);
    }
    /* 打开/text.txt 准备作读取动作*/
    fd = open("1.txt", O_RDONLY);
    if (fd >= 0)
    {
        read(fd, buffer, sizeof(buffer));
        close(fd);
        rt_kprintf("%s", buffer);
    }
    rt_kprintf("Replace 123 to abc<br>");
    num = 0;
    for(i=0;i<(sizeof(buffer) - 3);i++)
    {
        if(buffer* == '1')
        {
            if(buffer[i+1] == '2')
            {
                if(buffer[i+2] == '3')
                {
                    temp[num] = i;
                    num++;
                }
            }
        }
    }
    for(i=0;i<num;i++)
    {
        for(j=0;j<3;j++)
        {
            buffer[(j + temp*)] = change_temp[j];
        }
    }
    fd = open("1.txt", O_WRONLY | O_CREAT);
    if (fd >= 0)
    {
        write(fd, buffer, sizeof(buffer));
        close(fd);
    }
    rt_kprintf("Show New Array<br>");
    fd = open("1.txt", O_RDONLY);
    if (fd >= 0)
    {
        read(fd, buffer, sizeof(buffer));
        close(fd);
        rt_kprintf("%s", buffer);
    }
}
/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(change_data_sample, change_data_sample);