会C++跟会C的来看看
我有个程序是C++写的，我想改成C。请问谁能帮我用C把这程序写了
#include "stdio.h"
#include "iostream.h"
#include "string.h"
#include "iomanip.h"
#define FILENAME_LENGTH 10 //文件名称长度
#define COMMAND_LENGTH 10 //命令行长度
#define PARA_LENGTH 30 //参数长度
//账号结构
typedef struct users
{
char name[8];
char pwd[10];
}users;
//文件结构
struct fnode
{
char filename[FILENAME_LENGTH];
int isdir;
int isopen;
char content[255];
fnode *parent;
fnode *child;
fnode *prev;
fnode *next;
};
//账号
users usrarray[8] =
{
"usr1","usr1",
"usr2","usr2",
"usr3","usr3",
"usr4","usr4",
"usr5","usr5",
"usr6","usr6",
"usr7","usr7",
"usr8","usr8",
};
fnode *initfile(char filename[],int isdir);
void createroot();
int run();
int findpara(char *topara);
bool chklogin(char *users, char *pwd);
void help();
int mkdir();
int create();
int read();
int write();
int del();
int cd();
int dir();
fnode *root,*recent,*temp,*ttemp;
char para[PARA_LENGTH],command[COMMAND_LENGTH],temppara[PARA_LENGTH],recentpara[PARA_LENGTH];
//创建文件与目录结点
fnode* initfile(char filename[],int isdir)
{
fnode *node=new fnode;
strcpy(node->filename,filename);
node->isdir=isdir;
node->isopen=0;
node->parent=NULL;
node->child=NULL;
node->prev=NULL;
node->next=NULL;
return node;
}
//创建文件存储结点
void createroot ()
{
recent=root=initfile("/",1);
root->parent=NULL;
root->child=NULL;
root->prev=root->next=NULL;
strcpy(para,"/");
}
int mkdir()
{
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!");
return 1;
}
}
ttemp->next=temp;
temp->parent=NULL;
temp->child=NULL;
temp->prev=ttemp;
temp->next=NULL;
}
return 1;
}
int create()
{
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!"<<endl;
}
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!");
return 1;
}
}
ttemp->next=temp;
temp->parent=NULL;
temp->child=NULL;
temp->prev=ttemp;
temp->next=NULL;
cout<<"文件建立成功!"<<endl;
}
return 1;
}
int dir()
{
int i=0,j=0;
temp=new fnode;
temp=recent;
if(temp!=root)
{cout<<" <DIR> "<<".."<<endl;i++;}
if(temp->child==NULL)
{
cout<<"Total: "<<" directors " <<i<<" files "<< j <<endl;
return 1;
}
temp=temp->child;
while(temp)
{
if(temp->isdir)
{cout<<" <DIR> "<<temp->filename<<endl;i++;}
else
{cout<<" <FILE> "<<temp->filename<<endl;j++;}
temp=temp->next;
}
cout<<"Total: "<<" directors " <<i<<" files "<< j <<endl;
}
int read()
{
char filename[FILENAME_LENGTH];
cin>>filename;
if(recent->child==NULL)
{
cout<<"文件不存在!"<<endl;
return 1;
}
if(strcmp(recent->child->filename,filename)==0)
{
cout<<recent->child->content<<endl;
return 1;
}
else
{
temp=recent->child;
while(temp->next)
{
if(strcmp(temp->next->filename,filename)==0)
{cout<<temp->next->content<<endl;
return 1;}
}
cout<<"文件不存在!"<<endl;
}
}
int write()
{
char filename[FILENAME_LENGTH];
cin>>filename;
if(recent->child==NULL)
{
cout<<"文件不存在!"<<endl;
return 1;
}
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!"<<endl;
return 1;
}
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!"<<endl;
return 1;}
}
cout<<"文件不存在!"<<endl;
}
}
int cd()
{ char topara[PARA_LENGTH];
cin>>topara;
if(strcmp(topara,"..")==0)
{
int i;
while(recent->prev)
recent=recent->prev;
if(recent->parent)
{
recent=recent->parent;
}
i=strlen(para);
while(para!='/' && i>0) i--;
if(i!=0)
para='\0';
else
para[i+1]='\0';
}
else
{
findpara(topara);
}
return 1;
}
int findpara(char *topara)
{
int i=0;
int sign=1;
if(strcmp(topara,"/")==0)
{
recent=root;
strcpy(para,"/");
return 1;
}
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");
return 1;
}
}
}
while(i<=strlen(topara) && recent)
{
int j=0;
if(topara=='/' && recent->child)
{
i++;
if(recent->isdir)
recent=recent->child;
else
{printf("路径错误\n");
return 0;
}
strcat(para,"/");
}
while(topara!='/' && i<=strlen(topara))
{
recentpara[j]=topara;
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");
return 0;
}
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");
return 0;
}
}
return 1;
}
int del()
{
char filename[FILENAME_LENGTH];
cin>>filename;
temp=new fnode;
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！"<<endl;
return 0;
}
}
else
{
cout<<"不存在该文件！"<<endl;
return 0;
}
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;
}
delete temp;
cout<<"文件已删除!"<<endl;
}
bool chklogin(char *users, char *pwd)
{
int i;
for(i=0; i<8; i++)
{
if( (strcmp(users,usrarray.name)==0) && (strcmp(pwd,usrarray.pwd)==0))
return true;
}
return false;
}
void help(void)
{
cout<<" 命 令 一 览 "<<endl;
cout<<endl;
cout<<"create: 建立文件。 "<<endl;
cout<<"read: 读取文件。 "<<endl;
cout<<"write: 写入文件,支持多线程 "<<endl;
cout<<"del : 删除文件。 "<<endl;
cout<<"mkdir: 建立目录。 "<<endl;
cout<<"cd: 切换目录。 "<<endl;
cout<<"logout: 退出登录。 "<<endl;
}
int run()
{
cout<<"unix:"<<para<<">";
cin>>command;
if(strcmp(command,"mkdir")==0)
mkdir();
else if(strcmp(command,"dir")==0)
dir();
else if(strcmp(command,"cd")==0)
cd();
else if(strcmp(command,"create")==0)
create();
else if(strcmp(command,"read")==0)
read();
else if(strcmp(command,"write")==0)
write();
else if(strcmp(command,"del")==0)
del();
else if(strcmp(command,"help")==0)
help();
else if(strcmp(command,"logout")==0)
return 0;
else
cout<<"请参考help提供的命令列表!"<<endl;
}
int main()
{
int i=0;
bool in=false;
char users[8],pwd[12];
cout<<"|-----------------------------------------------------------------|"<<endl;
cout<<"| c语言模拟unix文件系统 |"<<endl;
cout<<"| 账号：usr1-usr8 密码：usr1-usr8 |"<<endl;
cout<<"| 你只有三次机会来试验账号 |"<<endl;
cout<<"| 键入help可以获取帮助 |"<<endl;
cout<<"|_________________________________________________________________|"<<endl;
cout<<endl;
while(i<3)
{
cout<<"Login:";
cin>>users;
cout<<"Pass:";
cin>>pwd;
if(chklogin(users,pwd))
{in=true;break;}
i++;
}
createroot();
while(in)
{
if(!run())
break;
}
}
