文件系统模拟设计c++.docx
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文件系统模拟设计c++.docx
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文件系统模拟设计c++
#include"stdio.h"
#include"iostream.h"
#include"string.h"
#include"iomanip.h"
#defineFILENAME_LENGTH10//文件名称长度
#defineCOMMAND_LENGTH10//命令行长度
#definePARA_LENGTH30//参数长度
//账号结构
typedefstructusers
{
charname[8];
charpwd[10];
}users;
//文件结构
structfnode
{
charfilename[FILENAME_LENGTH];
intisdir;
intisopen;
charcontent[255];//我是目录/我是文件
fnode*parent;
fnode*child;
fnode*prev;
fnode*next;
};
//账号
usersusrarray[8]=
{
"usr1","usr1",
"usr2","usr2",
"usr3","usr3",
"usr4","usr4",
"usr5","usr5",
"usr6","usr6",
"usr7","usr7",
"usr8","usr8",
};
fnode*initfile(charfilename[],intisdir);
voidcreateroot();
intrun();
intfindpara(char*topara);
boolchklogin(char*users,char*pwd);
voidhelp();
intmkdir();
intcreate();
intread();
intwrite();
intdel();
intcd();
intdir();
fnode*root,*recent,*temp,*ttemp;
charpara[PARA_LENGTH],command[COMMAND_LENGTH],temppara[PARA_LENGTH],recentpara[PARA_LENGTH];
//创建文件与目录结点
fnode*initfile(charfilename[],intisdir)
{
fnode*node=newfnode;
strcpy(node->filename,filename);
node->isdir=isdir;
node->isopen=0;
node->parent=NULL;
node->child=NULL;
node->prev=NULL;
node->next=NULL;
returnnode;
}
//创建文件存储结点
voidcreateroot()
{
recent=root=initfile("/",1);
root->parent=NULL;
root->child=NULL;
root->prev=root->next=NULL;
strcpy(para,"/");
}
intmkdir()
{
temp=initfile("",1);
cin>>temp->filename;
if(recent->child==NULL)
{
temp->parent=recent;
temp->child=NULL;
recent->child=temp;
temp->prev=temp->next=NULL;
}
else
{
ttemp=recent->child;
while(ttemp->next)
{
ttemp=ttemp->next;
if(strcmp(ttemp->filename,temp->filename)==0&&ttemp->isdir==1)
{
printf("对不起,目录已存在!
");
return1;
}
}
ttemp->next=temp;
temp->parent=NULL;
temp->child=NULL;
temp->prev=ttemp;
temp->next=NULL;
}
return1;
}
intcreate()
{
temp=initfile("",0);
cin>>temp->filename;
cin>>temp->content;
if(recent->child==NULL)
{
temp->parent=recent;
temp->child=NULL;
recent->child=temp;
temp->prev=temp->next=NULL;
cout<<"文件建立成功!
"< } else { ttemp=recent->child; while(ttemp->next) { ttemp=ttemp->next; if(strcmp(ttemp->filename,temp->filename)==0&&ttemp->isdir==0) { printf("对不起,文件已存在! "); return1; } } ttemp->next=temp; temp->parent=NULL; temp->child=NULL; temp->prev=ttemp; temp->next=NULL; cout<<"文件建立成功! "< } return1; } intdir() { inti=0,j=0; temp=newfnode; temp=recent; if(temp! =root) {cout<<" if(temp->child==NULL) { cout<<"Total: "<<"directors"< return1; } temp=temp->child; while(temp) { if(temp->isdir) {cout<<" else {cout<<" temp=temp->next; } cout<<"Total: "<<"directors"< } intread() { charfilename[FILENAME_LENGTH]; cin>>filename; if(recent->child==NULL) { cout<<"文件不存在! "< return1; } if(strcmp(recent->child->filename,filename)==0) { cout< return1; } else { temp=recent->child; while(temp->next) { if(strcmp(temp->next->filename,filename)==0) {cout< return1;} } cout<<"文件不存在! "< } } intwrite() { charfilename[FILENAME_LENGTH]; cin>>filename; if(recent->child==NULL) { cout<<"文件不存在! "< return1; } if(strcmp(recent->child->filename,filename)==0) { recent->child->isopen=1;//设置文件标记为打开 cin>>recent->child->content; recent->child->isopen=0;//设置文件标记为关闭 cout<<"文件写入成功! "< return1; } else { temp=recent->child; while(temp->next) { if(strcmp(temp->next->filename,filename)==0) { recent->child->isopen=1;//设置文件标记为打开 cin>>temp->next->content; recent->child->isopen=0;//设置文件标记为关闭 cout<<"文件写入成功! "< return1;} } cout<<"文件不存在! "< } } intcd() {chartopara[PARA_LENGTH]; cin>>topara; if(strcmp(topara,"..")==0) { inti; while(recent->prev) recent=recent->prev; if(recent->parent) { recent=recent->parent; } i=strlen(para); while(para[i]! ='/'&&i>0)i--; if(i! =0) para[i]='\0'; else para[i+1]='\0'; } else { findpara(topara); } return1; } intfindpara(char*topara) { inti=0; intsign=1; if(strcmp(topara,"/")==0) { recent=root; strcpy(para,"/"); return1; } temp=recent; strcpy(temppara,para); if(topara[0]=='/') { recent=root->child; i++; strcpy(para,"/"); } else { if(recent! =NULL&&recent! =root) strcat(para,"/"); if(recent&&recent->child) { if(recent->isdir) recent=recent->child; else { printf("路径错误! \n"); return1; } } } while(i<=strlen(topara)&&recent) { intj=0; if(topara[i]=='/'&&recent->child) { i++; if(recent->isdir) recent=recent->child; else {printf("路径错误\n"); return0; } strcat(para,"/"); } while(topara[i]! ='/'&&i<=strlen(topara)) { recentpara[j]=topara[i]; i++;j++; } recentpara[j]='\0'; while((strcmp(recent->filename,recentpara)! =0||(recent->isdir! =1))&&recent->next! =NULL) { recent=recent->next; } if(strcmp(recent->filename,recentpara)==0) { if(recent->isdir==0) {strcpy(para,temppara); recent=temp; printf("是文件不是目录。 \n"); return0; } strcat(para,recent->filename); } if(strcmp(recent->filename,recentpara)! =0||recent==NULL) { strcpy(para,temppara); recent=temp; printf("输入路径错误\n"); return0; } } return1; } intdel() { charfilename[FILENAME_LENGTH]; cin>>filename; temp=newfnode; if(recent->child) { temp=recent->child; while(temp->next&&(strcmp(temp->filename,filename)! =0||temp->isdir! =0)) temp=temp->next; if(strcmp(temp->filename,filename)! =0) { cout<<"不存在该文件! "< return0; } } else { cout<<"不存在该文件! "< return0; } if(temp->parent==NULL) { temp->prev->next=temp->next; if(temp->next) temp->next->prev=temp->prev; temp->prev=temp->next=NULL; } else { if(temp->next) temp->next->parent=temp->parent; temp->parent->child=temp->next; } deletetemp; cout<<"文件已删除! "< } boolchklogin(char*users,char*pwd) { inti; for(i=0;i<8;i++) { if((strcmp(users,usrarray[i].name)==0)&&(strcmp(pwd,usrarray[i].pwd)==0)) returntrue; } returnfalse; } voidhelp(void) { cout<<"命令一览"< cout< cout<<"create: 建立文件。 "< cout<<"read: 读取文件。 "< cout<<"write: 写入文件,支持多线程"< cout<<"del: 删除文件。 "< cout<<"mkdir: 建立目录。 "< cout<<"cd: 切换目录。 "< cout<<"logout: 退出登录。 "< } intrun() { cout<<"linux: "< cin>>command; if(strcmp(command,"mkdir")==0) mkdir(); elseif(strcmp(command,"dir")==0) dir(); elseif(strcmp(command,"cd")==0) cd(); elseif(strcmp(command,"create")==0) create(); elseif(strcmp(command,"read")==0) read(); elseif(strcmp(command,"write")==0) write(); elseif(strcmp(command,"del")==0) del(); elseif(strcmp(command,"help")==0) help(); elseif(strcmp(command,"logout")==0) return0; else cout<<"请参考help提供的命令列表! "< } intmain() { inti=0; boolin=false; charusers[8],pwd[12]; cout<<"|-----------------------------------------------------------------|"< cout<<"|c语言模拟Linux文件系统|"< cout<<"|账号: usr1-usr8密码: usr1-usr8|"< cout<<"|你只有三次机会来试验账号|"< cout<<"|键入help可以获取帮助|"< cout<<"|_________________________________________________________________|"< cout< while(i<3) { cout<<"Login: "; cin>>users; cout<<"Pass: "; cin>>pwd; if(chklogin(users,pwd)) {in=true;break;} i++; } createroot(); printf("rootdircreateok\n"); while(in) { if(! run()) break; } }
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