软件工程实验4

SA17225400【哪来的妖精 + 《软件工程（C编码实践篇）》MOOC课程作业http://mooc.study.163.com/course/USTC-1000002006 】

实验要求

• 用可重用的链表模块来实现命令行菜单小程序，执行某个命令时调用一个特定的函数作为执行动作；
• 链表模块的接口设计要足够通用，命令行菜单小程序的功能保持不变；
• 可以将通用的Linktable模块集成到我们的menu程序中；
• 接口规范；

实验过程

创建lab4

在目录中创建文件并编写代码

linktable.h

#ifndef _LINK_TABLE_H_
#define _LINK_TABLE_H_

#include <pthread.h>
#define SUCCESS 0
#define FAILURE (-1)

typedef struct LinkTableNode
{
    struct LinkTableNode *pNext;

}tLinkTableNode;

typedef struct LinkTable
{
   tLinkTableNode *pHead;
   tLinkTableNode *pTail;
   int SumOfNode;
   pthread_mutex_t mutex;

}tLinkTable;

tLinkTable *CreateLinkTable();

int DeleteLinkTable(tLinkTable *pLinkTable);
int AddLinkTableNode(tLinkTable *pLinkTable, tLinkTableNode *pNode);
int DelLinkTableNode(tLinkTable *pLinkTable, tLinkTableNode *pNode);

tLinkTableNode *GetLinkTableHead(tLinkTable *pLinkTable);
tLinkTableNode *GetLinkTableNextNode(tLinkTable *pLinkTable,tLinkTableNode *pNode);

#endif

linktable.c

#include <stdio.h>
#include <stdlib.h>
#include "linktable.h"


tLinkTable *CreateLinkTable()
{
    tLinkTable *pLinkTable = (tLinkTable*)malloc(sizeof(tLinkTable));
    if (pLinkTable == NULL)
        return NULL;
    pLinkTable -> pHead = NULL;
    pLinkTable -> pTail = NULL;
    pLinkTable -> SumOfNode = 0;
    return pLinkTable;
}
int DeleteLinkTable(tLinkTable *pLinkTable)
{
    if (pLinkTable == NULL)
        return FAILURE;
    while (pLinkTable -> pHead != NULL)
    {
        tLinkTableNode *p = pLinkTable -> pHead;
        pLinkTable -> pHead = pLinkTable -> pHead -> pNext;
        pLinkTable -> SumOfNode--;
        free(p);
    }
    pLinkTable -> pHead = NULL;
    pLinkTable -> pTail = NULL;
    free(pLinkTable);
    return SUCCESS;
}
int AddLinkTableNode(tLinkTable *pLinkTable, tLinkTableNode *pNode)
{
    if (pLinkTable == NULL || pNode == NULL)
        return FAILURE;
    pNode ->pNext = NULL;
    if (pLinkTable -> pHead == NULL)
        pLinkTable -> pHead = pNode;
    if (pLinkTable -> pTail == NULL)
        pLinkTable -> pTail = pNode;
    else
    {
        pLinkTable -> pTail -> pNext = pNode;
        pLinkTable -> pTail = pNode;
    }
    pLinkTable -> SumOfNode++;
    return SUCCESS;
}
int DelLinkTableNode(tLinkTable *pLinkTable,tLinkTableNode * pNode)
{
    if(pLinkTable == NULL || pNode == NULL)
        return FAILURE;
    if(pLinkTable->pHead == pNode)
    {
        pLinkTable->pHead = pLinkTable->pHead->pNext;
        pLinkTable->SumOfNode--;
        if(pLinkTable->SumOfNode == 0)
            pLinkTable->pTail = NULL;
        return SUCCESS;
    }
    tLinkTableNode * pTempNode = pLinkTable->pHead;
    while(pTempNode != NULL)
    {
        if(pTempNode->pNext == pNode)
        {
            pTempNode->pNext = pTempNode->pNext->pNext;
            pLinkTable->SumOfNode--;
            if(pLinkTable->SumOfNode == 0)
                pLinkTable->pTail = NULL;
            return SUCCESS;
        }
        pTempNode = pTempNode->pNext;
    }
    return FAILURE;
}
tLinkTableNode * GetLinkTableHead(tLinkTable *pLinkTable)
{
    if(pLinkTable == NULL)
    {
        return NULL;
    }
    return pLinkTable->pHead;
}
tLinkTableNode * GetNextLinkTableNode(tLinkTable *pLinkTable,tLinkTableNode * pNode)
{
    if(pLinkTable == NULL || pNode == NULL)
        return NULL;
    tLinkTableNode * pTempNode = pLinkTable->pHead;
    while(pTempNode != NULL)
    {
        if(pTempNode == pNode)
            return pTempNode->pNext;
        pTempNode = pTempNode->pNext;
    }
    return NULL;
}

menu.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "linktable.h"

#define CMD_MAX_LEN 128
typedef struct DataNode
{
    tLinkTableNode *pNext;
    char *cmd;
    char *desc;
    int (*handler)();
}tDataNode;

int Help();
int Date();
int Route();
int Exit();

tDataNode *FindCmd(tLinkTable *head, char *cmd)
{
    tDataNode *pNode = (tDataNode*)GetLinkTableHead(head);
    while (pNode != NULL)
    {
        if (strcmp(pNode -> cmd, cmd) == 0)
        {
            return pNode;
        }
        pNode = (tDataNode *)GetNextLinkTableNode(head, (tLinkTableNode *)pNode);
    }
    return NULL;
}

int ShowAllCmd(tLinkTable * head)
{
    tDataNode * pNode = (tDataNode *)GetLinkTableHead(head);
    while(pNode != NULL)
    {
        printf("%s - %s\n", pNode->cmd, pNode->desc);
        pNode = (tDataNode*)GetNextLinkTableNode(head,(tLinkTableNode *)pNode);
    }
    return 0;
}

int InitMenuData(tLinkTable ** ppLinkTable){
    *ppLinkTable = CreateLinkTable();
    tDataNode* pNode = (tDataNode*)malloc(sizeof(tDataNode));
    pNode->cmd = "help";
    pNode->desc = "Menu List:\n";
    pNode->handler = Help;
    AddLinkTableNode(*ppLinkTable,(tLinkTableNode *)pNode);

    pNode = (tDataNode*)malloc(sizeof(tDataNode));
    pNode->cmd = "version";
    pNode->desc = "Menu Programe V1.0\n";
    pNode->handler = NULL;
    AddLinkTableNode(*ppLinkTable,(tLinkTableNode *)pNode);

    pNode = (tDataNode*)malloc(sizeof(tDataNode));
    pNode->cmd = "date";
    pNode->desc = "Print the date\n";
    pNode->handler = Date;
    AddLinkTableNode(*ppLinkTable,(tLinkTableNode *)pNode);

    pNode = (tDataNode*)malloc(sizeof(tDataNode));
    pNode->cmd = "route";
    pNode->desc = "Print the route table\n";
    pNode->handler = Route;
    AddLinkTableNode(*ppLinkTable,(tLinkTableNode *)pNode);

    pNode = (tDataNode*)malloc(sizeof(tDataNode));
    pNode->cmd = "exit";
    pNode->desc = "The Programe will exit\n";
    pNode->handler = Exit;
    AddLinkTableNode(*ppLinkTable,(tLinkTableNode *)pNode);
    return 0;

}
tLinkTable *head = NULL;

int main()
{
    char cmd[CMD_MAX_LEN]; 
    InitMenuData(&head); 
     while(1)
    {    
        printf("\nPlease input your cmd:\n");
        scanf("%s",cmd);
        tDataNode *p = FindCmd(head,cmd);
        
        if(p == NULL)
        {
            printf("This is a wrong cmd!\n");
            continue;
        }
        printf("%s - %s\n", p->cmd, p->desc);
        if(p->handler != NULL)
        {
            p->handler();
        }
    }

    return 0;
}
int Help()
{
    ShowAllCmd(head);
    return 0;
}
int Date()
{
    system("date");
    return 0;
};

int Route()
{
    system("route");
    return 0;
};
int Exit()
{
    exit(0);
    return 0;
};

运行截图

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实验小结

这次实验内容较多，中间出现了一点曲折，调了很久终于成功运行了。通过这次学习学到了很多东西。