文件操作-源代码

//Filesystem_operations.cpp:Definestheentrypointfortheconsoleapplication.//#include"stdafx.h"#include<iostream>#include<fstream>#include<vector>#include<string>#include<algorithm>//<math.h>#include<sstream>#include<iomanip>#include<conio.h>#include"filesystem_struct.h"usingnamespacestd;#defineNum16//每个用户最大文件数#defineDISK_SIZE100MFDmfdlist[Num];UFDufdlist[Num];UOFuoflist[Num];DISKdisklist[DISK_SIZE];intcurrent_user_position;//当前用户在ufdlist中的位置//格式化磁盘voidformat_disk();//将更新后的物理块的信息重新写回磁盘voidback_disklist();//从磁盘中获得物理块的信息voidget_disklist();//将更新后的MFD重新写回磁盘voidback_mfdlist();//从磁盘中获得MFDvoidget_mfdlist();//将更新后的UFD重新写回磁盘voidback_ufdlist();//从磁盘中获得UFDvoidget_ufdlist();//在ufdlist中寻找可用的ufdintfind_empty_ufd();//在disklist中寻找可用的物理块intfind_empty_block();//在mfdlist中寻找可用的mfdintfind_empty_mfd();//在用户注销后，去除ufdlist和uoflistvoidclear_alllist();//返回以block物理块为第1个文件块的文件的第length个字节所在的物理块号intget_appointfile_block(intblock,intlength);//改变文件属性voidchatt(stringfilename,charattribute);//改变文件拥有者voidchown(stringfilename,stringnew_owner);//关闭文件voidclose(stringfilename);//文件拷贝voidcopy(stringsrcFile,stringdesFile);//srcFile源文件，desFile目标文件//建立文件voidcreat(stringfilename,charattribute);//删除文件voiddelet(stringfilename);//列出该用户下所有文件voidfiledir();//显示本系统命令voidhelp();//用户登陆voidlogin();//用户登出voidlogout();//翻开文件voidopen(stringfilename,charattribute);//修改用户密码voidpasswd(stringoldPwd,stringnewPwd);//将文件读指针开始的nbytes个字符读到屏幕上voidread(stringfilename,intnbytes);//改变文件名voidchfname(stringsrcFile,stringdesFile);//显示文件内容voidoutfile(stringfilename);//将数据buffer的前nbytes个写入到写指针指定的位置voidwrite(stringfilename,stringbuffer,intnbytes);//从键盘输入文件，可以包含任意字符(可见)。//当输入ctrl+z，表示输入结束voidwrite(stringfilename);//命令调用入口函数voidrun();//格式化磁盘voidformat_disk(){ ofstreamoutfile; outfile.open("disk.txt",ios::binary); for(inti=0;i<DISK_SIZE;i++) { outfile<<string(512,'')<<'\n'; } outfile.seekp(0,ios::beg); for(i=0;i<DISK_SIZE;i++) { outfile<<(char)i; outfile<<'0'<<char(0)<<''; } outfile.close(); cout<<"系统格式化成功！所有用户数据已经清空！\n";}//将更新后的物理块的信息重新写回磁盘voidback_disklist(){ ofstreamoutfile; outfile.open("disk.txt",ios::binary|ios::in); for(inti=0;i<DISK_SIZE;i++) { outfile<<disklist[i].id<<disklist[i].flag<<disklist[i].next<<''; } outfile.close();}//从磁盘中获得物理块的信息voidget_disklist(){ ifstreaminfile; infile.open("disk.txt",ios::binary); for(inti=0;i<DISK_SIZE;i++) { disklist[i].id=infile.get(); disklist[i].flag=infile.get(); disklist[i].next=infile.get(); infile.ignore();//这里假设一行不会超过1000个字符，所以含义是忽略一行 } infile.close();}//将更新后的MFD重新写回磁盘voidback_mfdlist(){ ofstreamoutfile; outfile.open("disk.txt",ios::binary|ios::in); outfile.seekp(513,ios::beg); for(inti=0;i<Num;i++) { outfile<<mfdlist[i].username<<string(14-mfdlist[i].username.size(),''); outfile<<mfdlist[i].userpwd<<string(14-mfdlist[i].userpwd.size(),''); outfile<<mfdlist[i].link<<string(3,''); } outfile.close();}//从磁盘中获得MFDvoidget_mfdlist(){ ifstreaminfile; infile.open("disk.txt",ios::binary); infile.seekg(513); for(inti=0;i<Num;i++) { charusername[14]; infile.read(username,14); mfdlist[i].username=username; mfdlist[i].username=mfdlist[i].username.substr(0,mfdlist[i].username.find('')); charuserpwd[14]; infile.read(userpwd,14); mfdlist[i].userpwd=userpwd; mfdlist[i].userpwd=mfdlist[i].userpwd.substr(0,mfdlist[i].userpwd.find('')); mfdlist[i].link=infile.get(); infile.seekg(3,ios::cur); } infile.close();}//将更新后的UFD重新写回磁盘voidback_ufdlist(){ ofstreamoutfile; outfile.open("disk.txt",ios::binary|ios::in); outfile.seekp(513*(current_user_position+2),ios::beg); for(inti=0;i<Num;i++) { outfile<<ufdlist[i].filename<<string(14-ufdlist[i].filename.size(),''); outfile<<ufdlist[i].attribute; outfile.write((char*)(&ufdlist[i].length),sizeof(int)); outfile<<ufdlist[i].first_physical_block; outfile<<string(12,''); } outfile.close();}//从磁盘中获得UFDvoidget_ufdlist(){ ifstreaminfile; infile.open("disk.txt",ios::binary); infile.seekg(513*mfdlist[current_user_position].link); for(inti=0;i<Num;i++) { charfilename[14]; infile.read(filename,14); ufdlist[i].filename=filename; ufdlist[i].filename=ufdlist[i].filename.substr(0,ufdlist[i].filename.find('')); infile.get(ufdlist[i].attribute); infile.read((char*)(&ufdlist[i].length),sizeof(int)); infile.get(ufdlist[i].first_physical_block); infile.seekg(12,ios::cur); } infile.close();}//在ufdlist中寻找可用的ufdintfind_empty_ufd(){ for(inti=0;i<Num;i++) { if(ufdlist[i].filename=="") returni; } return-1;}//在disklist中寻找可用的物理块intfind_empty_block(){ for(inti=18;i<DISK_SIZE;i++) { if(disklist[i].flag=='0') { //将其改为已分配 disklist[i].flag='1'; returni; } } return-1;}//在mfdlist中寻找可用的mfdintfind_empty_mfd(){ for(inti=0;i<Num;i++) { if(mfdlist[i].username=="") returni; } return-1;}//在用户注销后，去除ufdlist和uoflistvoidclear_alllist(){ for(inti=0;i<Num;i++) { ufdlist[i].filename=""; uoflist[i].filename=""; }}//返回以block物理块为第1个文件块的文件的第length个字节所在的物理块号intget_appointfile_block(intblock,intlength){ intblockNum=length/512; if(blockNum==0) { returnblock; } intfirst_physical_block=block; for(inti=1;i<=blockNum;i++) { first_physical_block=disklist[first_physical_block].next; } returnfirst_physical_block;}//从键盘输入文件，可以包含任意字符(可见)。//当输入ctrl+z，表示输入结束stringinput_data_infile(){ strings; while(1) { intc=getch(); if(c==26)//ascii中的sub，即^Z { printf("^Z"); break; } if(c==13)//ascii中的cr，即回车 { printf("\n"); s+='\n'; } else { printf("%c",c); s+=char(c); } } returns;}//////////////////////////////////////////////////////////////////////////////////系统命令函数，共有Num+1条命令/////////////////////////////////////////////////////////////////////////////////////////////改变文件属性voidchatt(stringfilename,charattribute){ for(inti=0;i<Num;i++) { if(ufdlist[i].filename==filename) break; } if(i==Num) { cout<<"该文件不存在！\n"; return; } ufdlist[i].attribute=attribute; uoflist[i].attribute=attribute; cout<<"已成功改变文件属性！\n";}//改变文件拥有者voidchown(stringfilename,stringnew_owner){ for(inti=0;i<Num;i++) { if(ufdlist[i].filename==filename) break; } if(i==Num) { cout<<"该文件不存在！\n"; return; } for(intk=0;k<Num;k++) { if(mfdlist[k].username==new_owner) break; } if(k==Num) { cout<<"该用户不存在！\n"; return; } intoldufdindex=i; UFDoldufd=ufdlist[oldufdindex]; UFDoldownerufdlist[Num]; copy(ufdlist,ufdlist+Num,oldownerufdlist); intoldownerindex=current_user_position; current_user_position=k; //获得新用户的UFD get_ufdlist(); boolhavefile=false; intufdindex=-1; for(i=0;i<Num;i++) { if(ufdlist[i].filename==filename) { havefile=true; } if(ufdindex==-1&&ufdlist[i].filename=="") { ufdindex=i; } } if(ufdindex==-1) { cout<<"新用户的文件总数已满！\n"; //恢复旧用户的UFD current_user_position=oldownerindex; copy(oldownerufdlist,oldownerufdlist+Num,ufdlist); return; } if(havefile) { cout<<"新用户的已经有同名文件！\n"; //恢复旧用户的UFD current_user_position=oldownerindex; copy(oldownerufdlist,oldownerufdlist+Num,ufdlist); return; } ufdlist[ufdindex]=oldufd; back_ufdlist(); //恢复旧用户的UFD current_user_position=oldownerindex; copy(oldownerufdlist,oldownerufdlist+Num,ufdlist); ufdlist[oldufdindex].filename=""; cout<<"已成功改变文件拥有者！\n";}//关闭文件voidclose(stringfilename){ for(inti=0;i<Num;i++) { if(uoflist[i].filename==filename) break; } if(i==Num) { cout<<"该文件未翻开！\n"; return; } //删除UOF uoflist[i].filename=""; cout<<"已成功关闭文件！\n";}//文件拷贝voidcopy(stringsrcFile,stringdesFile)//srcFile源文件，desFile目标文件{ for(inti=0;i<Num;i++) { if(ufdlist[i].filename==srcFile) break; } if(i==Num) { cout<<"源文件不存在！\n"; return; } if(srcFile==desFile) { cout<<"源文件和目标文件重名！\n"; return; } for(intk=0;k<Num;k++) { if(ufdlist[k].filename==desFile) break; } if(k!=Num) { cout<<"目标文件已经存在！\n"; return; } ifstreaminfile; infile.open("disk.txt",ios::binary); intfirst_physical_block=ufdlist[i].first_physical_block; stringfile=""; intlength=ufdlist[i].length; //读取源文件中的数据，到file中 while(1) { infile.seekg(513*first_physical_block,ios::beg); if(length>512) { strings; getline(infile,s,'\n'); file+=s; length=length-512; first_physical_block=disklist[first_physical_block].next; } else { strings; getline(infile,s,'\n'); s=s.substr(0,length); file+=s; break; } } //建立目标文件 creat(desFile,ufdlist[i].attribute); //将源文件中的数据写入目标文件中 write(desFile,file,file.size()); cout<<"已成功拷贝文件！\n";}//建立文件voidcreat(stringfilename,charattribute){ for(inti=0;i<Num;i++) { if(ufdlist[i].filename==filename) { cout<<"该文件已经存在，不能重名！\n"; return; } } intufdNum=find_empty_ufd(); if(ufdNum==-1) { cout<<"文件总数已满！\n"; return; } intfirst_physical_block=find_empty_block(); if(first_physical_block==-1) { cout<<"磁盘已满！\n"; return; } //添加到ufdlist中 ufdlist[ufdNum].filename=filename; ufdlist[ufdNum].attribute=attribute; ufdlist[ufdNum].length=0; ufdlist[ufdNum].first_physical_block=first_physical_block; //添加到uoflist中 uoflist[ufdNum].filename=filename; uoflist[ufdNum].attribute=attribute; uoflist[ufdNum].length=0; uoflist[ufdNum].first_physical_block=first_physical_block; uoflist[ufdNum].state='0'; uoflist[ufdNum].readptr=0; uoflist[ufdNum].writeptr=0; cout<<"创立文件"<<filename<<"成功！\n";}//删除文件voiddelet(stringfilename){ for(inti=0;i<Num;i++) { if(ufdlist[i].filename==filename) break; } if(i==Num) { cout<<"该文件不存在！\n"; return; } ufdlist[i].filename=""; //把文件在disk中占用的资源释放 intfirst_physical_block=ufdlist[i].first_physical_block; for(intk=0;k<=ufdlist[i].length%512;k++) { disklist[first_physical_block].flag='0'; first_physical_block=disklist[first_physical_block].next; } //把文件从uoflist中删除 for(i=0;i<Num;i++) { if(uoflist[i].filename==filename) { uoflist[i].filename=""; break; } } cout<<"删除文件"<<filename<<"成功！\n";}//列出该用户下所有文件voidfiledir(){ intcount=0;//计算文件个数 for(inti=0;i<Num;i++) { if(ufdlist[i].filename!="") { count++; cout<<"\t"<<ufdlist[i].filename<<"\t"; if(ufdlist[i].attribute=='0') cout<<"--r--"; elseif(ufdlist[i].attribute=='1') cout<<"--w--"; elseif(ufdlist[i].attribute=='2') cout<<"-r-w-"; cout<<"\t"<<ufdlist[i].length<<"Byte(s)"; cout<<"\t"<<(int)ufdlist[i].first_physical_block<<"\n"; } } cout<<"\t\t\t共有文件"<<count<<"个\n";}//显示本系统命令voidhelp(){ cout.setf(ios::left); cout<<"\t本文件系统命令用法如下：\n\n\n"; cout<<"文件操作的根本命令：\n"; cout<<setw(8)<<"creat"<<setw(10)<<"filename"<<setw(10)<<"attribute"<<"\t新建文件\n" <<"\t\t(attribute(属性):0-read_only;1-write_only;2-read_write)\n"; cout<<setw(8)<<"open"<<setw(10)<<"filename"<<setw(10)<<"attribute"<<"\t翻开文件\n" <<"\t\t(attribute(属性):0-read_only;1-write_only;2-read_write)\n"; cout<<setw(8)<<"close"<<setw(10)<<"filename"<<"\t\t关闭文件\n"; cout<<setw(8)<<"delet"<<setw(10)<<"filename"<<"\t\t删除文件\n"; cout<<setw(8)<<"copy"<<setw(10)<<"源文件名"<<setw(10)<<"目标文件名"<<"\t文件拷贝\n"; cout<<setw(8)<<"read"<<setw(10)<<"filename"<<setw(10)<<"pointer"<<"\t将文件读指针开始的pointer个字符读到屏幕上\n"; cout<<setw(8)<<"write"<<setw(10)<<"filename"<<"\t从键盘输入数据字符写到文件中，结束时按Ctrl+Z\n" <<"\t\t(可以输入任意可见字符，包括空格、回车！)\n"; cout<<setw(8)<<"write"<<setw(10)<<"filename"<<setw(10)<<"buffer"<<setw(10)<<"pointer"<<"\t将数据buffer的前pointer个字符写入文件中\n" <<"\t\t(输入的字符之间不能有空格！)\n"; cout<<setw(8)<<"outfile"<<setw(10)<<"filename"<<"\t\t显示文件内容到屏幕\n"; cout<<setw(8)<<"chfname"<<setw(10)<<"源文件名"<<setw(10)<<"目标文件名"<<"\t改变文件名\n"; cout<<setw(8)<<"chown"<<setw(10)<<"filename"<<setw(10)<<"new_owner"<<"\t改变文件拥有者\n"; cout<<setw(8)<<"chatt"<<setw(10)<<"filename"<<setw(10)<<"attribute"<<"\t改变文件属性\n" <<"\t\t(attribute(属性):0-read_only;1-write_only;2-read_write)\n"; cout<<setw(8)<<"filedir"<<"\t\t\t列出该用户下所有文件\n" <<"\t\t(输出格式：文件名属性大小文件始指针)\n\n"; cout<<"用户登录注销命令：\n"; cout<<setw(8)<<"help"<<"\t\t\t显示本系统所有命令\n"; cout<<setw(8)<<"login"<<setw(10)<<"userName"<<setw(10)<<"pwd"<<"\t用户登陆命令\n"; cout<<setw(8)<<"logout"<<"\t\t\t用户注销\n"; cout<<setw(8)<<"passwd"<<setw(10)<<"oldPwd"<<setw(10)<<"newPwd"<<"\t修改用户密码\n"; }//用户登陆voidlogin(){ while(1) { cout<<">"; vector<string>command; chart[50]; cin.getline(t,50); strings; for(stringstreamsin(t);sin>>s;command.push_back(s)); if(command.empty()) continue; if(command[0]=="exit") { exit(0); } if(command[0]!="login") { cout<<"请使用login命令登陆!\n"; continue; } if(command.size()!=3) { cout<<"请正确地输入用户名和密码！\n"; continue; } stringname=command[1]; stringpassword=command[2]; for(inti=0;i<Num;i++) { if(mfdlist[i].username==name) break; } if(i<Num) { if(password==mfdlist[i].userpwd) { current_user_position=i; get_ufdlist(); cout<<"欢送老用户的归来："<<name<<"\n"; return; } for(inttime=1;time<=3;time++) { cout<<"密码错误，请重输：(注：输入错误到达三次会自动退出系统)"; cin>>password; if(password==mfdlist[i].userpwd) { current_user_position=i; get_ufdlist();cin.ignore(); cout<<"欢送老用户的归来："<<name<<"\n"; return; } } if(time>3) { cout<<"错误次数太多！再见\n"; exit(0); } } else { MFDmfd; mfd.username=name; mfd.userpwd=password; current_user_position=find_empty_mfd(); if(current_user_position==-1) { cout<<"用户总数已满！无法添加新用户！\n"; continue; } mfd.link=current_user_position+2; mfdlist[current_user_position]=mfd; get_ufdlist(); cout<<"您是新用户，欢送你的使用："<<name<<"\n"; cout<<"假设你对本系统的命令不熟悉，请输入help查看！"<<"\n"; return; } } }//用户登出voidlogout(){ back_disklist(); back_mfdlist(); back_ufdlist(); clear_alllist();//在用户注销后，去除ufdlist和uoflist cout<<""<<mfdlist[current_user_position].username<<"您已经注销！\n"; cout<<"退出系统，请输入exit命令！\n";}//翻开文件voidopen(stringfilename,charattribute){ for(inti=0;i<Num;i++) { if(ufdlist[i].filename==filename) break; } if(i==Num) { cout<<"该文件不存在！\n"; return; } if(ufdlist[i].attribute!=attribute) { cout<<"文件属性不合法！不能翻开文件！\n"; return; } if(uoflist[i].filename!="") { if(uoflist[i].state=='1') cout<<"错误！文件已经翻开！\n"; else cout<<"错误！文件正在建立！\n"; return; } uoflist[i].filename=ufdlist[i].filename; uoflist[i].attribute=ufdlist[i].attribute; uoflist[i].length=ufdlist[i].length; uoflist[i].first_physical_block=ufdlist[i].first_physical_block; uoflist[i].state='1'; uoflist[i].readptr=0; uoflist[i].writeptr=0; cout<<"翻开文件"<<filename<<"成功！\n"; }//修改用户口令voidpasswd(stringoldPwd,stringnewPwd){ if(mfdlist[current_user_position].userpwd!=oldPwd) { cout<<"旧密码错误！\n"; return; } mfdlist[current_user_position].userpwd=newPwd; cout<<"已成功修改密码！\n"; }//将文件读指针开始的nbyte个字符读到屏幕上voidread(stringfilename,intnbytes){ for(inti=0;i<Num;i++) { if(uoflist[i].filename==filename) break; } if(i==Num) { cout<<"该文件未翻开！\n"; return; } if(uoflist[i].attribute=='1') { cout<<"该文件只写！\n"; return; } ifstreaminfile; infile.open("disk.txt",ios::binary); intfirst_physical_block=get_appointfile_block(uoflist[i].first_physical_block,uoflist[i].readptr); intoffset=uoflist[i].readptr%512; uoflist[i].readptr+=nbytes; stringread=""; intlength=nbytes; while(1) { infile.seekg(513*first_physical_block+offset,ios::beg); if(length+offset>512) { chara[513]; infile.read(a,512-offset); strings=a; read=read+s; length=length-512-offset; first_physical_block=disklist[first_physical_block].next; offset=0; } else { chara[513]; infile.read(a,512); strings=a; s=s.substr(0,length); read+=s; break; } } cout<<read<<"\n";}//改变文件名voidchfname(stringsrcFile,stringdesFile){ boolhavesrcFile=false; boolhavedesFile=false; intt=-1; for(inti=0;i<Num;i++) { if(ufdlist[i].filename==srcFile) { havesrcFile=true; if(t==-1)t=i; } if(ufdlist[i].filename==desFile) { havedesFile=true; } } if(!havesrcFile) { cout<<"该文件不存在！\n"; return; } if(havedesFile) { cout<<"存在一个重名文件！\n"; return; } ufdlist[t].filename=desFile; uoflist[t].filename=desFile; cout<<"已成功改变文件名！\n";}//显示文件内容voidoutfile(stringfilename){ for(inti=0;i<Num;i++) { if(ufdlist[i].filename==filename) break; } if(i==Num) { cout<<"该文件不存在！\n"; return; } intfirst_physical_block=ufdlist[i].first_physical_block; intlength=ufdlist[i].length; stringfile=""; ifstreaminfile; infile.open("disk.txt",ios::binary); while(1) { infile.seekg(513*first_physical_block,ios::beg); if(length>512) { chara[513]; infile.read(a,512); strings=a; s=s.substr(0,512); file+=s; length=length-512; first_physical_block=disklist[first_physical_block].next; } else { chara[513]; infile.read(a,512); strings=a; s=s.substr(0,length); file+=s; break; } } cout<<file<<endl;}//将buffer中的nbytes个字符写入到写指针指定的位置voidwrite(stringfilename,stringbuffer,intnbytes){ for(inti=0;i<Num;i++) { if(uoflist[i].filename==filename) break; } if(i==Num) { cout<<"该文件未翻开！\n"; return; } if(uoflist[i].attribute=='0') { cout<<"该文件只读！\n"; return; } if(buffer.size()>nbytes) buffer=buffer.substr(0,nbytes); if(buffer.size()<nbytes) nbytes=buffer.size(); intfirst_physical_block=get_appointfile_block(uoflist[i].first_physical_block,uoflist[i].writeptr); intoffset=uoflist[i].writeptr%512; uoflist[i].writeptr+=nbytes; boolisadd=false; if(uoflist[i].writeptr>uoflist[i].length) { uoflist[i].length=uoflist[i].writeptr; ufdlist[i].length=uoflist[i].writeptr; isadd=true; } ofstreamoutfile; outfile.open("disk.txt",ios::binary|ios::in); while(1) { outfile.seekp(513*first_physical_block+offset,ios::beg); if(buffer.size()>512-offset) { outfile<<buffer.substr(0,512-offset); buffer=buffer.substr(512-offset,buffer.size()-512); //找下一个物理块 if(disklist[first_physical_block].next==0) { disklist[first_physical_block].next=find_empty_block(); if(first_physical_block==-1) { cout<<"磁盘已满！未能全部写入！\n"; return; } } first_physical_block=disklist[first_physical_block].next; offset=0; } else { outfile<<buffer; if(isadd) outfile<<string(512-buffer.size(),''); break; } } cout<<"已成功写入文件！\n"; }//从键盘输入文件，可以包含任意字符(可见)。//当输入ctrl+z，表示输入结束voidwrite(stringfilename){ for(inti=0;i<Num;i++) { if(uoflist[i].filename==filename) break; } if(i==Num) { cout<<"该文件未翻开！\n"; return; } if(uoflist[i].attribute=='0') { cout<<"该文件只读！\n"; return; } //把文件在disk中占用的资源释放，除第一个物理块外 intfirst_physical_block=uoflist[i].first_physical_block; first_physical_block=disklist[first_physical_block].next; for(intk=1;k<=ufdlist[i].length%512;k++) { disklist[first_physical_block].flag='0'; first_physical_block=disklist[first_physical_block].next; } cout<<"请输入文件内容，结束时按Ctrl+Z\n"; //从控制台中获得文件 stringfile=input_data_infile(); first_physical_block=uoflist[i].first_physical_block; uoflist[i].writeptr=file.size(); uoflist[i].length=file.size(); ufdlist[i].length=file.size(); ofstreamoutfile; outfile.open("disk.txt",ios::binary|ios::in); while(1) { outfile.seekp(513*first_physical_block,ios::beg); if(file.size()>512) { outfile<<file.substr(0,512); file=file.substr(512,file.size()-512); //找下一个物理块 if(disklist[first_physical_block].next==0) { disklist[first_physical_block].next=find_empty_block(); if(first_physical_block==-1) { cout<<"磁盘已满！未能全部写入！\n"; return; } } first_physical_block=disklist[first_physical_block].next; } else { outfile<<file; outfile<<string(512-file.size(),''); break; } } cout<<"\n已成功写入文件！\n";}//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////voidrun(){ stringERROR="命令的参数错误！\n"; while(1) { cout<<mfdlist[current_user_position].username<<">"; vector<string>command; chart[1000]; cin.getline(t,1000); strings; for(stringstreamsin(t);sin>>s;command.push_back(s)); if(command.empty()) continue; if(command[0]=="chatt") { if(command.size()!=3) cout<<ERROR; else { if(command[2]!="0"&&command[2]!="1"&&command[2]!="2") cout<<ERROR; elsechatt(command[1],command[2][0]); } } elseif(command[0]=="chown") { if(command.size()!=3) cout<<ERROR; else chown(command[1],command[2]); } elseif(command[0]=="close") { if(command.size()!=2) cout<<ERROR; else close(command[1]); } elseif(command[0]=="copy") { if(command.size()!=3) cout<<ERROR; else { copy(command[1],command[2]); } } elseif(command[0]=="creat") { if(command.size()!=3) cout<<ERROR; else { if(command[2]!="0"&&command[2]!="1"&&command[2]!="2") cout<<ERROR;