1.txt

文件管理系统：用于实现一个简单的多用户操作的文件管理系统

				for(i=0;i<savenum;i++)
					if(strcmp(tempfile,userfd[i].filename)==0) 
						break;
				if(i>=savenum) 
					mesg("File not existed!");
				else                  //文件存在的情况
				{
					for(i=0;i<opennum;i++)
						if(strcmp(tempfile,openfd[i].filename)==0)
							break;
						if(i<opennum)         //文件已经打开
						{
							mesg("File already opened!");
							if(openfd[i].opencode!=tempcode)
							{
								openfd[i].opencode=tempcode;
								mesg("File permission changed!");   
							}
						}
						else if(opennum>=L)    //打开的文件已经占满了5个名额
							mesg("Error! cannot open file! nimber of opened files limited!");
						else                   //打开处理
						{
							strcpy(openfd[opennum].filename,tempfile);
							openfd[opennum].opencode=tempcode;
							workfile=opennum;
							opennum++;
							mesg("File open success!");
						} 
				}
			}
		}
}

  
void myclose()                   //关闭文件
{
	int i,j;
	char tempfile[100];
	if(strcmp(username,"")==0) 
		mesg("No user login!");
    else
	{
		if(command->next==NULL) 
			mesg("Too few parameters!");
        else if(command->next->next!=NULL) 
			mesg("Too many parameters!");
        else
		{
            strcpy(tempfile,command->next->string);
			for(i=0;i<savenum;i++)
				if(strcmp(userfd[i].filename,tempfile)==0) 
					break;
	        if(i>=savenum)             //文件不存在
				mesg("the file donot existed!");
			else 
			{
				for(j=0;j<opennum;j++)
					if(strcmp(openfd[j].filename,tempfile)==0)
						break;
				if(j>=opennum)         //文件存在了但是没有打开
					mesg("the file already close!");
	            else                  //文件存在并且打开
				{
					strcpy(openfd[j].filename,"");
				    openfd[j].opencode=' ';
				    opennum--;
				    mesg("File close success!");
				}
			}
		}
	}
}


void mydelete()              //删除文件
{
	int i,j;
	int tempsave;     //用于确定被删除文件在数组userfd[M]中的位置
	char tempfile[100];
	FILE *fp;
	if(strcmp(username,"")==0) 
		mesg("No user login!");
    else
	{
		if(command->next==NULL) 
			mesg("Too few parameters!");
        else if(command->next->next!=NULL) 
			mesg("Too many parameters!");
        else
		{
			strcpy(tempfile,command->next->string);
			for(i=0;i<savenum;i++)
				if(strcmp(userfd[i].filename,tempfile)==0) 
					break;
			tempsave=i;
	        if(tempsave>=savenum)             //文件不存在
				mesg("the file donot existed!");
			else 
			{
				for(j=0;j<opennum;j++)
					if(strcmp(openfd[j].filename,tempfile)==0)
						break;
				if(j<opennum)         //文件存在了但是打开
				{
					mesg("File can't delete!");
					mesg("Close it first!");
				}
	            else                  //文件存在并且没有打开
				{
					strcpy(userfd[tempsave].filename,"");
                    userfd[tempsave].protect=' ';
                    userfd[tempsave].length=0;
					savenum--;
					for(i=tempsave;i<=savenum;i++)         //从新将数组userfd[M]排序
					{
						strcpy(userfd[i].filename,userfd[i+1].filename);
                        userfd[i].protect=userfd[i+1].protect;
                        userfd[i].length=userfd[i+1].protect;
					}
				    mesg("File delete!");
					fp=fopen(username,"w+");       //写回到文件username
                    for(i=0;i<savenum;i++)          
					{
						fputs(userfd[i].filename,fp);
                        fputs("\n",fp);
                        fprintf(fp,"%c\n%d\n",userfd[i].protect,userfd[i].length);
					}
		            fclose(fp);
				}
			}
		}
	}
}


void myread()    //读操作
{
	int i;
	int tempsave;
	char tempfile[100];
	if(strcmp(username,"")==0) 
		mesg("No user login!");
	else if(command->next==NULL) 
		mesg("Too few parameters!");
	else if(command->next->next!=NULL)
		mesg("Too many parameters!");
	else
	{
		strcpy(tempfile,command->next->string);
		for(i=0;i<savenum;i++)
			if(strcmp(tempfile,userfd[i].filename)==0)
				break;
		if(i>=savenum) 
			mesg("the File not existed!");
		else 
		{
			tempsave=i;
			for(i=0;i<opennum;i++)
				if(strcmp(tempfile,openfd[i].filename)==0)
					break;
			if(i>=opennum) 
				mesg("File not opened!");
			else
			{
				if(userfd[tempsave].length<1000)
					printf("\n The file size is %d B",userfd[tempsave].length);
				else
					if(userfd[tempsave].length=1000)
						printf("\n The file size is 1000 B");
					else
						printf("\n The file size is %d,%d KB",
						userfd[tempsave].length/1000,userfd[tempsave].length%1000);
			mesg("File read!");
			}
		}
	}
}


void mywrite()   //写操作
{
	int i;
	int tempsave;
	char tempfile[100];
	if(strcmp(username,"")==0) 
		mesg("No user login!");
	else if(command->next==NULL) 
		mesg("Too few parameters!");
	else if(command->next->next!=NULL)
		mesg("Too many parameters!");
	else
	{
		strcpy(tempfile,command->next->string);
		for(i=0;i<savenum;i++)
			if(strcmp(tempfile,userfd[i].filename)==0)
				break;
		if(i>=savenum) 
			mesg("the File not existed!");
		else 
		{
			tempsave=i;
			for(i=0;i<opennum;i++)
				if(strcmp(tempfile,openfd[i].filename)==0)
					break;
			if(i>=opennum) 
				mesg("File not opened!");
			else
			{
				if(userfd[tempsave].length<1000)
					printf("\n The file size is %d KB",userfd[tempsave].length);
				else
					if(userfd[tempsave].length=1000)
						printf("\n The file size is 1000KB");
					else
						printf("\n The file size is %d,%d KB",
						userfd[tempsave].length/1000,userfd[tempsave].length%1000);
			mesg("File written!");
			}
		}
	}
}


void help()       //帮助说明
{
	static char *cmd[]={"login","setpass","logout","create",
		                "open","read","write","delete","dir",
						"help","exit","copy","rename"};
	static char *cmdhlp[]={"command format:login [<username>]",
                           "command format:setpass",
						   "command format:logout",
						   "command format:create <filename>",
						   "command format:open [/r|/w|/d] <filename>",
						   "command format:read <filename>",
						   "command format:write <filename>",
						   "command format:delete <filename>",
						   "command format:dir [/u|/o|/f]",
						   "command format:help [<command>]",
						   "command format:exit",
						   "command format:copy <source filename> <destination filename>",
						   "command format:rename <old filename> <new filename>"};
	static char *detail[]={"explain:user login in the file system.",
		                   "explain:modify the user password.",
						   "explain:user logout the file system.",
						   "explain:create a new file.",
						   "explain:/r--read only [deflaut] \n\t /w--read and modify \n\t /d--read modify and delete.",
						   "explain:read the file.",
						   "explain:modify a new file.",
						   "explain:delete a new file.",
						   "explain:/u--list the user account\n\t /o--list opened files \n\t /f --list user files [deflaut]",
						   "explain:<command>--list the command detail format andexplain.\n\t [deflaut] list the command.",
                           "explain:exit from the file system",
                           "explain:copy from one file to another file",
						   "explain:modify the file name."};
	int helpnum=13;
    int i;

    if(command->next==NULL)
	{
		mesg(cmdhlp[9]);
	    mesg(detail[9]);
	    mesg("step 1:login");
	    printf("\t if old user then login,if user not exist then create new user");
	    mesg("step 2:open the file for read(/r),write(/w) or delete(/d)");
	    printf("        /t you can open one or more files one command can open one file");
	    mesg("step 3:read,write or delete some one file");
	    printf("        /t you can oprate one of the opened files. one command can open one file");
	    mesg("step 4:close the open file");
	    printf("        /t you can close one of the opened files. one command can open one file");
	    mesg("step 5:user logout.close all the user opened files.");
	    printf("        \n command list:");
	    for(i=0;i<helpnum;i++)
		{
			if(i%4==0) 
				printf("\n"); 
			printf("%-10s",cmd[i]);
		}
	}
    else if(command->next->next!=NULL)
		mesg("Too many parameters!");
    else
	{
		for(i=0;i<helpnum;i++)
			if(strcmp(command->next->string,cmd[i])==0)
				break;
	    if(i>=helpnum) 
			mesg("the command not existed!");
	    else
		{
			mesg(cmdhlp[i]); 
		    mesg(detail[i]);
		}
	}
}




void dir()       //显示操作
{
	int i,j;
	int flag=0;
	if(command->next==NULL) 
		mesg("Too few parameters!");
	else if(command->next->next!=NULL) 
		mesg("Too many parameters!");
	else if(strcmp(command->next->string,"/f")==0)
	{
		if(strcmp(username,"")==0) 
		{
			mesg("No user login!");
		    mesg("login first!");
			return;
		}
		printf("total user files: %d file(s)  ",savenum);
		printf("20 files limited!\n");
		for(i=0;i<savenum;i++)
		{
			if(strlen(userfd[i].filename)>0)
			{
				printf("%s         ",userfd[i].filename);
			    printf("%dKB\n",userfd[i].length);
			}
		}
	}
	else if(strcmp(command->next->string,"/o")==0)
	{
		if(strcmp(username,"")==0) 
		{
			mesg("No user login!");
		    mesg("login first!");
			return;
		}
		printf("total user opened files: %d file(s)   ",opennum);
		printf("5 opened files limited!\n");
		for(i=0;i<opennum;i++)
		{
			printf("%s         ",openfd[i].filename);
			flag=openfd[i].opencode;
			if(flag='r')
			    printf("read only\n");
			else if(flag='w')
				printf("read and modify\n");
			else if(flag='d')
				printf("read modify and delete\n");
			else 
				printf("noknow operater\n");
		}
	}
	else if(strcmp(command->next->string,"/u")==0)
	{
		j=0;
		for(i=0;i<M;i++)
			if(strlen(mainfd[i].username)>0)
				j++;
		printf("total user : %d file(s)   ",j);
		printf("30 files limited!\n");
		for(i=0;i<usernum;i++)
			printf("%s\n",mainfd[i].username);
	}
    else if(command->next->string[0]=='/') 
		mesg("/u-list the user account /o-list opened files /f-list user files");
	else 
		mesg("Error operating!");
}
         

void mycopy()
{
	int i,j,temp;
	char sourfile[256],destfile[256];
	FILE *fp;
	char tempchar;
	if(strcmp(username,"")==0) 
		mesg("no user login!");
	else if(command->next==NULL)
		mesg("Too few parameters!");
	else if(command->next->next==NULL) 
		mesg("Too few parameters!");
	else if(command->next->next->next!=NULL)
		mesg("Too many parameters!");
	else
	{
		strcpy(sourfile,command->next->string);
		strcpy(destfile,command->next->next->string);
		for(i=0;i<savenum;i++)
			if(strcmp(sourfile,userfd[i].filename)==0) 
				break;
		temp=i;
		if(i>=savenum) 
			printf("\n the source file not exist!");
		else
		{
			for(i=0;i<opennum;i++)
			if(strcmp(sourfile,openfd[i].filename)==0)
				break;
			if(i>=opennum) printf("\n the source file not opened!");
			else
			{
				for(j=0;j<opennum;j++)
					if(strcmp(destfile,openfd[j].filename)==0) 
						break;
				if(j<opennum) mesg("Error! the destination file opened,you must close it first.");
				else
				{
					for(j=0;j<savenum;j++)
						if(strcmp(destfile,userfd[j].filename)==0)
							break;
                	if(j<opennum)
					{
						mesg("Warning! the destination file exist!");
						printf("\n Are you sure to recover it?[Y/N]");
						while(!kbhit());
						tempchar=getch();
						if(tempchar=='N'||tempchar=='n')
							mesg("Cancel! file not copy.");
						else if(tempchar=='Y'||tempchar=='y')
						{
							mesg("File copy success! file recovered!");
							userfd[j].length=userfd[i].length;
							userfd[j].protect=userfd[i].protect;
							fp=fopen(username,"w+");
							for(i=0;i<savenum;i++)
							{
								fputs(userfd[i].filename,fp);
								fputs("\n",fp);
								fprintf(fp,"%c\n%d\n",userfd[i].protect,userfd[i].length);
							}
							fclose(fp);
						}
				}
					else if(savenum>=M)
						mesg("copy false! file total limited.");
					else
					{
						strcpy(userfd[savenum].filename,destfile);
						userfd[savenum].length=userfd[temp].length;
						userfd[savenum].protect=userfd[temp].protect;
						savenum++;
						fp=fopen(username,"w+");
							for(i=0;i<savenum;i++)
							{
								fputs(userfd[i].filename,fp);
								fputs("\n",fp);
								fprintf(fp,"%c\n%d\n",userfd[i].protect,userfd[i].length);
							}
							fclose(fp);
							mesg("File copy success!");
					}
				}
			}
		}
	}
}



void myrename()
{
	int i,j,temp;
	char oldfile[256],newfile[256];
	FILE *fp;
	if(strcmp(username,"")==0) 
		mesg("No user login!");
	else if(command->next==NULL) 
		mesg("Too few parameters!");
	else if(command->next->next==NULL)   
		mesg("Too few parameters!");
	else if(command->next->next->next!=NULL)   
		mesg("Too many parameters!");
	else
	{
		strcpy(oldfile,command->next->string);
        strcpy(newfile,command->next->next->string);
		for(i=0;i<savenum;i++)
			if(strcmp(userfd[i].filename,oldfile)==0) 
				break;
		temp=i;
	    if(temp>=savenum)             //文件不存在
			mesg("the soruce file donot existed!");
		else 
		{
			for(j=0;j<opennum;j++)
				if(strcmp(openfd[j].filename,oldfile)==0)
					break;
				if(j<opennum)         //文件存在了但是打开
					mesg("Source file mustbe close!");
	            else                  //文件存在并且没有打开
				{
					strcpy(userfd[temp].filename,newfile);
				    mesg("File rename success!");
					fp=fopen(username,"w+");       //写回到文件username
                    for(i=0;i<savenum;i++)          
					{
						fputs(userfd[i].filename,fp);
                        fputs("\n",fp);
                        fprintf(fp,"%c\n%d\n",userfd[i].protect,userfd[i].length);
					}
		            fclose(fp);
				}
		}
	}
}