unixfilesyssim.cpp

在内存中申请1M的空间来模拟存取设备

				}
			}
			break;
		}
	}
	strlwr(key);
	strlwr(path);
}

/*
* 函数介绍：创建一个文件
* 输入参数：无
* 输出参数：无
* 返 回 值：无
*/
void Create(char *filename)
{
	if (strcmp(filename, "") == 0)
	{
		printf("对不起，文件名不能为空。\n");
	}
	else
	{
		CreateFileElement(protect, filename, file, NULL, CS.CurrParent);
	}
	printf("%s %s\n$", CS.CurrentUser.UserName, CS.CurrentPath);
}

/*
* 函数介绍：列出当前目录的文件和文件夹
* 输入参数：path 路径
* 输出参数：无
* 返 回 值：无
*/
void Dir(char *path)
{
	char display[1000];
	memset(display, '\0', 1000);

	//查找显示内容
	for (unsigned i = 0; i < FS.FI.FICount; i++)
	{
		if (strcmp(FS.FI.FIStart[i].ParentName, CS.CurrParent->FileName) == 0 && 
			FS.FI.FIStart[i].FileLevel == CS.FileLevel && FS.FI.FIStart[i].effect == 1)
		{
			strcat(display, FS.FI.FIStart[i].FileName);
			strcat(display, "\t\t");
		}
	}

	printf("\n%s\n", display);
	printf("%s %s\n$", CS.CurrentUser.UserName, CS.CurrentPath);
}

/*
* 函数介绍：打开当前目录的文件
* 输入参数：path 路径
* 输出参数：无
* 返 回 值：无
*/
void Open(char *path)
{
	char display[100];
	for (unsigned i = 0; i < FS.FI.FICount; i++)
	{
		if (strcmp(FS.FI.FIStart[i].ParentName, CS.CurrParent->FileName) == 0 && 
			FS.FI.FIStart[i].FileLevel == CS.FileLevel && FS.FI.FIStart[i].effect == 1 &&
			strcmp(FS.FI.FIStart[i].FileName, path) == 0)
		{
			FSElement *fselem = (FSElement *)FindBlankFileBlock(FS.FI.FIStart[i].FileBlockId);
			fselem->fileStu = opened;
			strcpy(display, "文件已打开完毕。\n");
			break;
		}
	}

	if (strcmp(display, "") == 0)
	{
		strcpy(display, "当前目录下没有您要打开的文件。\n");
	}
	printf("\n%s\n", display);
	printf("%s %s\n$", CS.CurrentUser.UserName, CS.CurrentPath);
}

/*
* 函数介绍：读取当前目录文件
* 输入参数：path 路径
* 输出参数：无
* 返 回 值：无
*/
void Read(char *path)
{
	char display[FILEBLOCKCAP];
	for (unsigned i = 0; i < FS.FI.FICount; i++)
	{
		if (strcmp(FS.FI.FIStart[i].ParentName, CS.CurrParent->FileName) == 0 && 
			FS.FI.FIStart[i].FileLevel == CS.FileLevel && FS.FI.FIStart[i].effect == 1 &&
			strcmp(FS.FI.FIStart[i].FileName, path) == 0)
		{
			FSElement *fselem = (FSElement *)FindBlankFileBlock(FS.FI.FIStart[i].FileBlockId);
			if (fselem->fileStu == closed)
			{
				strcpy(display, "文件尚未打开，请先打开文件。\n");
			}
			else
			{
				if (fselem->FileData == NULL || strcmp(fselem->FileData, "") == 0)
				{
					strcpy(display, "文件无内容。\n");
				}
				else
				{
					strcpy(display, fselem->FileData);		
				}
				fselem->fileStu = reading;
			}
			
			break;
		}
	}

	if (strcmp(display, "") == 0)
	{
		strcpy(display, "当前目录下没有您要打开的文件。\n");
	}
	printf("\n%s\n", display);
	printf("%s %s\n$", CS.CurrentUser.UserName, CS.CurrentPath);		
}

/*
* 函数介绍：写当前目录文件
* 输入参数：path 路径
* 输出参数：无
* 返 回 值：无
*/
void Write(char *path)
{
	char display[FILEBLOCKCAP];
	memset(display, '\0', FILEBLOCKCAP);

	for (unsigned i = 0; i < FS.FI.FICount; i++)
	{
		if (strcmp(FS.FI.FIStart[i].ParentName, CS.CurrParent->FileName) == 0 && 
			FS.FI.FIStart[i].FileLevel == CS.FileLevel && FS.FI.FIStart[i].effect == 1 &&
			strcmp(FS.FI.FIStart[i].FileName, path) == 0)
		{
			FSElement *fselem = (FSElement *)FindBlankFileBlock(FS.FI.FIStart[i].FileBlockId);
			if (fselem->fileStu == closed)
			{
				strcpy(display, "文件尚未打开，请先打开文件。\n");
			}
			else
			{
				printf("\n注意：文件最大不可以超过 %d 字节！！按CTRL+D结束编辑。\n", FILEBLOCKCAP - sizeof(FSElement));
				char c;
				int i = 0;
				while ((c = getchar()) != 0x04)
				{
					display[i++] = c;
				}
				getchar();	//处理回车
				display[i] = '\0';
				strcpy(fselem->FileData, display);	
				unsigned len = strlen(display) <  FILEBLOCKCAP - sizeof(FSElement) ? strlen(display) :  FILEBLOCKCAP - sizeof(FSElement);
				strncpy(fselem->FileData, display, len);
				fselem->fileStu = writing;
				strcpy(display, "文件写入成功。\n");
			}
			
			break;
		}
	}
	printf("\n%s\n", display);
	printf("%s %s\n$", CS.CurrentUser.UserName, CS.CurrentPath);		

}

/*
* 函数介绍：关闭当前目录的文件
* 输入参数：path 路径
* 输出参数：无
* 返 回 值：无
*/
void Close(char *path)
{
	char display[100];
	for (unsigned i = 0; i < FS.FI.FICount; i++)
	{
		if (strcmp(FS.FI.FIStart[i].ParentName, CS.CurrParent->FileName) == 0 && 
			FS.FI.FIStart[i].FileLevel == CS.FileLevel && FS.FI.FIStart[i].effect == 1 &&
			strcmp(FS.FI.FIStart[i].FileName, path) == 0)
		{
			FSElement *fselem = (FSElement *)FindBlankFileBlock(FS.FI.FIStart[i].FileBlockId);
			fselem->fileStu = opened;
			strcpy(display, "文件已关闭。\n");
			break;
		}
	}

	if (strcmp(display, "") == 0)
	{
		strcpy(display, "当前目录下没有您要关闭的文件。\n");
	}
	printf("\n%s\n", display);
	printf("%s %s\n$", CS.CurrentUser.UserName, CS.CurrentPath);
}

/*
* 函数介绍：删除当前目录的文件
* 输入参数：path 路径
* 输出参数：无
* 返 回 值：无
*/
void Delete(char *path)
{
	char display[100] = "";
	for (unsigned i = 0; i < FS.FI.FICount; i++)
	{
		if (strcmp(FS.FI.FIStart[i].ParentName, CS.CurrParent->FileName) == 0 && 
			FS.FI.FIStart[i].FileLevel == CS.FileLevel && FS.FI.FIStart[i].effect == 1 &&
			strcmp(FS.FI.FIStart[i].FileName, path) == 0)
		{
			FS.FI.FIStart[i].effect = 0;	//删除标记
			strcpy(display, "文件已删除。\n");
			break;
		}
	}

	if (strcmp(display, "") == 0)
	{
		strcpy(display, "当前目录下没有您要删除的文件。\n");
	}
	printf("\n%s\n", display);
	printf("%s %s\n$", CS.CurrentUser.UserName, CS.CurrentPath);
}

/*
* 函数介绍：创建一个文件夹
* 输入参数：文件夹名
* 输出参数：无
* 返 回 值：无
*/
void Mkdir(char *filename)
{
	if (strcmp(filename, "") == 0)
	{
		printf("对不起，文件夹名不能为空。\n");
	}
	else
	{
		CreateFileElement(protect, filename, dir, NULL, CS.CurrParent);
	}
	printf("%s %s\n$", CS.CurrentUser.UserName, CS.CurrentPath);
}


/*
* 函数介绍：进入一个文件夹
* 输入参数：path 路径
* 输出参数：无
* 返 回 值：无
*/
void Cd(char *path)
{
	int splitDisplayCou = 0;	//分割符出现的次数
	if(strcmp(path, "..") == 0)
	{
		if (CS.FileLevel > 0)
		{
			CS.FileLevel--;
			CS.CurrParent = CS.CurrParent->parent;
			for (unsigned i = strlen(CS.CurrentPath) - 1; i > 0; i--)
			{
				if (CS.CurrentPath[i] == '\\')
				{
					splitDisplayCou++;
					if (splitDisplayCou == 2)	//已过滤掉最后一个目录名
					{
						break;
					}
				}
			}
			char temppath[1000] ;
			strcpy(temppath, CS.CurrentPath);
			memset(CS.CurrentPath, '\0', 1000);
			strncpy(CS.CurrentPath, temppath, i+1);
		}
		else
		{

		}
	}
	else
	{
		char display[100] = "";
		for (unsigned i = 0; i < FS.FI.FICount; i++)
		{
			if (strcmp(FS.FI.FIStart[i].ParentName, CS.CurrParent->FileName) == 0 && 
				FS.FI.FIStart[i].FileLevel == CS.FileLevel && FS.FI.FIStart[i].effect == 1 &&
				strcmp(FS.FI.FIStart[i].FileName, path) == 0)
			{
				strcpy(display, "文件存在。\n");
				CS.CurrParent = (FSElement *)FindBlankFileBlock(FS.FI.FIStart[i].FileBlockId);
				CS.FileLevel++;
				strcat(CS.CurrentPath, path);	
				strcat(CS.CurrentPath, "\\");
				break;
			}
		}
		if (strcmp(display, "") == 0)	//文件夹不存在，什么都不做
		{
			printf("当前目录下没有您要进入的文件夹。\n");
		}
	}
	printf("%s %s\n$", CS.CurrentUser.UserName, CS.CurrentPath);
}

/*
* 函数介绍：命令分拣模块
* 输入参数：无
* 输出参数：无
* 返 回 值：无
*/
void CommandTrans()
{
	char command[COMMANDMAXLEN];
	gets(command);
	char key[10];
	char path[COMMANDMAXLEN - 10];
	while (true)
	{
		memset(key, '\0', 10);
		memset(path, '\0', COMMANDMAXLEN - 10);
		FindCommKey(command, key, path); 
		unsigned i;
		for (i = 0; i < PROSETCOMMCOU; i++)
		{
			if (strcmp(key, PROSETCOMM[i]) == 0)
			{
				break;
			}
		}

		switch (i)
		{
		case 0:		
			Create(path);
			break;
		case 1:
			Open(path);
			break;
		case 2:
			Read(path);
			break;
		case 3:
			Write(path);
			break;
		case 4:
			Close(path);
			break;
		case 5:
			Delete(path);
			break;
		case 6:
			Mkdir(path);
			break;
		case 7:
			Cd(path);
			break;
		case 8:
			Dir(path);
			break;
		case 9:
			//Logout
			break;
		case 10:
			break;
		default:
			printf("\n命令错误。\n");
			printf("%s %s\n$", CS.CurrentUser.UserName, CS.CurrentPath);
		}
		if (i == 9)
		{
			break;
		}
		gets(command);
	}
}

/*
* 函数介绍：退出时清理分配的内存空间
* 输入参数：无
* 输出参数：无
* 返 回 值：无
*/
void ClearFileSys()
{
	free( CS.CurrentUser.UserName );
	free(CS.CurrentPath);

	free(FS.FSStart);		
}

void main()
{
	//初始化系统
	if (InitFileSys())
	{
		while (Login())
		{
			CommandTrans();
			strcpy(CS.CurrentUser.UserName,"man");
			CS.CurrentUser.ut = admin;
			CS.FileLevel = 0;
			CS.CurrParent = NULL;
			strcpy(CS.CurrentPath, "\\");
			printf("您已退出系统。\n");
		}
	}
	else
	{
		printf("系统初始化失败，按任意键退出。\n");	
	}

	//清理系统内存
	ClearFileSys();
	getch();
}