lab3实验报告

1、实验的思路和具体过程

将代码分为如下三个文件：

其中

cmd.h文件是存放所需要的定义的数据类型

cmd.c是存放command处理的子程序，

menu.c是main函数和command的处理入口，代码处理流程：

 

2、实验中关键代码

 结构体定义：

typedef struct st_Cmd
{
    unsigned char *pucCmd;
    unsigned char *pucCmd_description;
    void          (*func)(void *pParam);
    struct st_Cmd *next;
}st_Cmd_s;

/*define the struct*/
static st_Cmd_s g_st_Cmd[CMD_NUM] = 
{
    {"rm",       "rm command is used to delete files or directory\n",  &CMD_Rm_Process,       NULL},
    {"ifconfig", "ifconfig command is used to get ip info\n",          &CMD_Ifconfig_Process, NULL},
    {"ls",       "ls command is used to display thedirectory files\n", &CMD_Ls_Process,       NULL},
    {"cd",       "cd command is used to jump a directory\n",           &CMD_Cd_Process,       NULL},
    {"ln",       "ln command is use to make link\n",                   &CMD_Ln_Process,       NULL},
    {"find",     "find command is used to look up files\n",            &CMD_Find_Process,     NULL}, 
    {"grep",     "grep command is same as find\n",                     &CMD_Grep_Process,     NULL},
    {"cp",       "cp command is used to copy files\n",                 &CMD_Cp_Process,       NULL},
    {"pwd",      "pwd command is used to display the file list\n",     &CMD_Pwd_Process,      NULL},
    {"mkdir",    "mkdir command is used to make a directory\n",        &CMD_Mkdir_Process,    NULL},
    {"help",     "print the support command list\n",                   &CMD_Help_Process,     NULL},
    {"quit",     "cmd help is quit, don't continue process!\n",        &CMD_Quit_Process,     NULL}
};

command关键处理函数：

void CMD_Rm_Process(void *pParam); 
void CMD_Ifconfig_Process(void *pParam);
void CMD_Ls_Process(void *pParam); 
void CMD_Cd_Process(void *pParam);
void CMD_Mkdir_Process(void *pParam);
void CMD_Ln_Process(void *pParam);
void CMD_Find_Process(void *pParam);
void CMD_Grep_Process(void *pParam);
void CMD_Cp_Process(void *pParam);
void CMD_Pwd_Process(void *pParam);
void CMD_Process(unsigned char *puCmd);
void CMD_Help_Process(void *pParam);
void CMD_Quit_Process(void *pParam);

 

command处理函数及main函数：

/*********************************************************
* name:SA17225233
* func: CMD_Process
* date:2017/09/19
**********************************************************/
void CMD_Process(unsigned char *puCmd)
{
    unsigned int i        = 0;    
    st_Cmd_s     *pst_Cmd = g_st_Cmd;
    
    /*param check*/
    if(puCmd == NULL)
    {
        printf("cmd is NULL, error!!!\n");
    }

    while(pst_Cmd != NULL)
    {
        if(pst_Cmd->pucCmd == NULL)
        {
            printf("unknow the command!\n");
            return;
        }
    
        if(strcmp(puCmd, pst_Cmd->pucCmd) == 0)
        {
            if(pst_Cmd->pucCmd_description != NULL)
            {
                puts(pst_Cmd->pucCmd_description);
            }

            if(pst_Cmd->func != NULL)
            {
                pst_Cmd->func((void *)puCmd);
            }
            return;    
        } 
        pst_Cmd++;
    } 
    
    return;
}

/*********************************************************
* name:SA17225233
* func: main
* date:2017/09/19
**********************************************************/
void main(void)
{
    /*define the var, init cmd */
    unsigned char ucCmd[CMD_LEN];
    
    while(CMD_TRUE)
    {
        /*clean cmd,input command*/
        memset(ucCmd, 0, CMD_LEN);
        printf("please input cmd:\n");
        gets(ucCmd);

        /*process cmd*/
        CMD_Process(ucCmd);
    }
    
    return;
}

 

3、实验关键代码截图

 

 

4、实验运行结果截图

 

5、实验心得

C语言的重要地方就是结构体与指针应用，熟悉并精通指针，就能够写出许多结构化的简洁高效代码！随着实验的进行，我也越来越熟悉指针的运用了！