操作系统课程设计报告
专 业：
学 号：
姓 名：
提交日期：
【设计目的】
（1）本实验的目的是通过一个简单多用户文件系统的设计，加深理解文件系统的内部功能和内部实现。
（2）结合数据结构、程序设计、计算机原理等课程的知识，设计一个二级文件系统，进一步理解操作系统。
（3）通过分对实际问题的分析、设计、编程实现，提高学生实际应用、编程的能力
【设计内容】
为Linux系统设计一个简单的二级文件系统。要求做到以下几点：
1.可以实现下列几条命令：
login 用户登录
dir 列目录
create 创建文件
delete 删除文件
open 打开文件
close 关闭文件
read 读文件
write 写文件
cd 进出目录
2．列目录时要列出文件名，物理地址，保护码和文件长度
3．源文件可以进行读写保护
【实验环境】
C++/VC++
【源程序清单】
#include "stdio.h"
#include "string.h"
#include "conio.h"
#include "stdlib.h"
#define MAXNAME 25 /*the largest length of mfdname,ufdname,filename*/
#define MAXCHILD 50 /*the largest child*/
#define MAX (MAXCHILD*MAXCHILD) /*the size of fpaddrno*/
typedef struct /*the structure of OSFILE*/
{
int fpaddr; /*file physical address*/
int flength; /*file length*/
int fmode; /*file mode:0-Read Only;1-Write Only;2-Read and Write; 3-Protect;*/
char fname[MAXNAME]; /*file name*/
} OSFILE;
typedef struct /*the structure of OSUFD*/
{
char ufdname[MAXNAME]; /*ufd name*/
OSFILE ufdfile[MAXCHILD]; /*ufd own file*/
}OSUFD;
typedef struct /*the structure of OSUFD'LOGIN*/
{
char ufdname[MAXNAME]; /*ufd name*/
char ufdpword[8]; /*ufd password*/
} OSUFD_LOGIN;
typedef struct /*file open mode*/
{
int ifopen; /*ifopen:0-close,1-open*/
int openmode; /*0-read only,1-write only,2-read and write,3-initial*/
}OSUFD_OPENMODE;
OSUFD *ufd[MAXCHILD]; /*ufd and ufd own files*/
OSUFD_LOGIN ufd_lp;
int ucount=0; /*the count of mfd's ufds*/
int fcount[MAXCHILD]; /*the count of ufd's files*/
int loginsuc=0; /*whether login successfully*/
char username[MAXNAME]; /*record login user's name22*/
char dirname[MAXNAME];/*record current directory*/
int fpaddrno[MAX]; /*record file physical address num*/
OSUFD_OPENMODE ifopen[MAXCHILD][MAXCHILD]; /*record file open/close*/
int wgetchar; /*whether getchar()*/
FILE *fp_mfd,*fp_ufd,*fp_file_p,*fp_file;
void LoginF(); /*LOGIN FileSystem*/
void DirF(); /*Dir FileSystem*/
void CdF(); /*Change Dir*/
void CreateF(); /*Create File*/
void DeleteF(); /*Delete File*/
void ModifyFM(); /*Modify FileMode*/
void OpenF(); /*Open File*/
void CloseF(); /*Close File*/
void ReadF(); /*Read File*/
void WriteF(); /*Write File*/
void QuitF(); /*Quit FileSystem*/
void help();
char *rtrim(char *str); /*remove the trailing blanks.*/
char *ltrim(char *str); /*remove the heading blanks.*/
void InputPW(char *password); /*input password,use '*' replace*/
void SetPANo(int RorW); /*Set physical address num*/
int ExistD(char *dirname); /*Whether DirName Exist,Exist-i,Not Exist-0*/
int WriteF1(); /*write file*/
int ExistF(char *filename); /*Whether FileName Exist,Exist-i,Not Exist-0*/
int FindPANo(); /*find out physical address num*/
void clrscr()
{
system("cls");
}
int main()
{
int i,choice1;
char choice[50]; /*choice operation:dir,create,delete,open,delete,modify,read,write*/
int choiceend=1; /*whether choice end*/
char *rtrim(char *str); /*remove the trailing blanks.*/
char *ltrim(char *str); /*remove the heading blanks.*/
if((fp_mfd=fopen("c:\\osfile\\mfd.txt","rb"))==NULL)
{
fp_mfd=fopen("c:\\osfile\\mfd.txt","wb");
fclose(fp_mfd);
}
for(i=0;i<MAX;i++) fpaddrno[i]=0;
//textattr(BLACK*16|WHITE);
clrscr(); /*clear screen*/
LoginF(); /*user login*/
clrscr();
if(loginsuc==1) /*Login Successfully*/
{
while (1)
{
wgetchar=0;
if (choiceend==1)
printf("\n\nC:\\%s>",strupr(dirname));
else
printf("Bad command or file name.\nC:\\%s>",strupr(username));
gets(choice); //输入所选择的
strcpy(choice,ltrim(rtrim(strlwr(choice)))); //将输入的值赋给choice
if (strcmp(choice,"dir")==0) choice1=1; //依次将输入的值与dir，create等进行比较
else if(strcmp(choice,"create")==0) choice1=2; //如果输入create将choice1置为2通过switch选择，以下依次类推
else if(strcmp(choice,"delete")==0) choice1=3;
else if(strcmp(choice,"attrib")==0) choice1=4;
else if(strcmp(choice,"open")==0) choice1=5;
else if(strcmp(choice,"close")==0) choice1=6;
else if(strcmp(choice,"read")==0) choice1=7;
else if(strcmp(choice,"write")==0) choice1=8;
else if(strcmp(choice,"exit")==0) choice1=9;
else if(strcmp(choice,"cls")==0) choice1=10;
else if(strcmp(choice,"cd")==0) choice1=11;
else if(strcmp(choice,"help")==0) choice1=20;
else choice1=12; //choice1=12时跳转到default，然后继续循环
switch(choice1)
{
case 1:DirF();choiceend=1;break;
case 2:CreateF();choiceend=1;if(!wgetchar) getchar();break;
case 3:DeleteF();choiceend=1;if(!wgetchar)getchar();break;
case 4:ModifyFM();choiceend=1;if(!wgetchar) getchar();break;
case 5:OpenF();choiceend=1;if (!wgetchar) getchar();break;
case 6:CloseF();choiceend=1;if (!wgetchar) getchar();break;
case 7:ReadF();choiceend=1;if (!wgetchar) getchar();break;
case 8:WriteF();choiceend=1;if (!wgetchar) getchar();break;
case 9:printf("\nYou have exited this system.");
QuitF();exit(0);break;
case 10:clrscr();choiceend=1;break;
case 11:CdF();choiceend=1;break;
case 20:help();choiceend=1;break;
default:choiceend=0;
}
}
}
else
printf("\nAccess denied."); //登录成功
}
void help(void)
{
printf("\nThe Command List\n");
printf("\nCd Attrib Create write Read Open Cls Delete Exit Close\n");
}
char *rtrim(char *str) /*除去末尾端的空格指针指向字符串第一个*/
{
int n=strlen(str)-1; //n为字符串长度减1
while(n>=0)
{
if(*(str+n)!=' ') //末尾不存在空格
{
*(str+n+1)='\0'; //'\n'表示结束符
break;
}
else n--; //如果存在空格将空格去掉
}
if (n<0) str[0]='\0';
return str;
}
char *ltrim(char *str) /*除去前端的空格*/
{
strrev(str); //把字符串str的所有字符的顺序颠倒
rtrim(str); //去掉尾端空格
strrev(str); //再颠倒过来
return str;
}
void LoginF() /*LOGIN FileSystem*/
{
char loginame[MAXNAME],loginpw[9],logincpw[9],str[50];
int i,j,flag=1;
char a[25];
int findout; /*login user not exist*/
while(1)
{
findout=0;
printf("\n\nLogin Name:");
gets(loginame); //输入字符串
ltrim(rtrim(loginame)); //去掉前后端的空格
fp_mfd=fopen("c:\\osfile\\mfd.txt","rb"); //打开该文件，返回给一个文件指针
for(i=0;fread(&ufd_lp,sizeof(OSUFD_LOGIN),1,fp_mfd)!=0;i++) //检测输入登录名和mfd.txt是否一样
if (strcmp(strupr(ufd_lp.ufdname),strupr(loginame))==0) //若已经注册过
{
findout=1; //表示该用户已注册过
strcpy(logincpw,ufd_lp.ufdpword);
}
fclose(fp_mfd);
if (findout==1) /*user exist*/
{
printf("Login Password:");
InputPW(loginpw); /*input password,use '*' replace*/
if (strcmp(loginpw,logincpw)==0)
{
strcpy(username,strupr(loginame));
strcpy(dirname,username);
fp_mfd=fopen("c:\\osfile\\mfd.txt","rb");
for(j=0;fread(&ufd_lp,sizeof(OSUFD_LOGIN),1,fp_mfd)!=0;j++)
{
strcpy(str,"c:\\osfile\\");
strcat(str,ufd_lp.ufdname);
strcat(str,".txt");
ufd[j]=(OSUFD*)malloc(sizeof(OSUFD));
strcpy(ufd[j]->ufdname,strupr(ufd_lp.ufdname));
fp_ufd=fopen(str,"rb");
fcount[j]=0;
for(i=0;fread(&ufd[j]->ufdfile[i],sizeof(OSFILE),1,fp_ufd)!=0;i++,fcount[j]++)
{
ifopen[j][i].ifopen=0;
ifopen[j][i].openmode=4;
}
fclose(fp_ufd);
}
fclose(fp_mfd);
ucount=j;
SetPANo(0);
printf("\n\nLogin successful! Welcome to this FileSystem\n\n");
loginsuc=1;
return;
}
else
{
printf("\n\n");
flag=1;
while(flag)
{
printf("Login Failed! Password Error. Try Again(Y/N):");
gets(a);
ltrim(rtrim(a));
if (strcmp(strupr(a),"Y")==0)
{
loginsuc=0;
flag=0;
}
else if(strcmp(strupr(a),"N")==0)
{
loginsuc=0;
flag=0;
return;
}
}
}
}
else
{
printf("New Password(<=8):");
InputPW(loginpw); /*input new password,use '*' replace*/
printf("\nConfirm Password(<=8):"); /*input new password,use '*' replace*/
InputPW(logincpw);
if (strcmp(loginpw,logincpw)==0)
{
strcpy(ufd_lp.ufdname,strupr(loginame));
strcpy(ufd_lp.ufdpword,loginpw);
fp_mfd=fopen("c:\\osfile\\mfd.txt","ab");
fwrite(&ufd_lp,sizeof(OSUFD_LOGIN),1,fp_mfd);
fclose(fp_mfd);
strcpy(username,strupr(loginame));
strcpy(dirname,loginame);
////////////////////////////////////////////////////////
strcpy(str,"c:\\osfile\\");
strcat(str,username);
strcat(str,".txt");
if((fp_ufd=fopen(str,"rb"))==NULL)
{
fp_ufd=fopen(str,"wb");
fclose(fp_ufd);
}
fp_mfd=fopen("c:\\osfile\\mfd.txt","rb");
for(j=0;fread(&ufd_lp,sizeof(OSUFD_LOGIN),1,fp_mfd)!=0;j++)
{
/////////////////////////////////////
strcpy(str,"c:\\osfile\\");
strcat(str,ufd_lp.ufdname);
strcat(str,".txt");
ufd[j]=(OSUFD*)malloc(sizeof(OSUFD));
strcpy(ufd[j]->ufdname,strupr(ufd_lp.ufdname));
fp_ufd=fopen(str,"rb");
for(i=0;fread(&ufd[j]->ufdfile[i],sizeof(OSFILE),1,fp_ufd)!=0;i++,fcount[j]++)
{
ifopen[j][i].ifopen=0;
ifopen[j][i].openmode=4;
}
fclose(fp_ufd);
}
fclose(fp_mfd);
ucount=j;
SetPANo(0);
printf("\n\nLogin Successful! Welcome to this System\n\n");
loginsuc=1;
return;
}
else
{
printf("\n\n");
flag=1;
while(flag)
{
printf("Login Failed! Password Error. Try Again(Y/N):");
gets(a);
ltrim(rtrim(a));
if (strcmp(strupr(a),"Y")==0)
{
loginsuc=0;
flag=0;
}
else if(strcmp(strupr(a),"N")==0)
{
loginsuc=0;
flag=0;
return;
}
}
}
}
}
}
void SetPANo(int RorW) /*Set physical address num,0-read,1-write*/
{
int i,j;
if (RorW==0)
{
if((fp_file_p=fopen("c:\\osfile\\file\\file_p.txt","rb"))==NULL) //如果文件未读成功
{
fp_file_p=fopen("c:\\osfile\\file\\file_p.txt","wb"); //创建该文件
fclose(fp_file_p);
}
fp_file_p=fopen("c:\\osfile\\file\\file_p.txt","rb");
///////////////////////////////////////////////////////////////////
for(i=0;fread(&j,sizeof(int),1,fp_file_p)!=0;i++)
fpaddrno[j]=1; //真正模拟的位示图的关系
/*for(i=1;i<MAX;i++)
if ((i%13)==0)
fpaddrno[i]=1;*/
}
else
{
fp_file_p=fopen("c:\\osfile\\file\\file_p.txt","wb");
/*for(i=1;i<MAX;i++)
if((i%13)==0)
fpaddrno[i]=0;*/
for(i=0;i<MAX;i++)
if (fpaddrno[i]==1) //表示已使用
fwrite(&i,sizeof(int),1,fp_file_p); //把第几个扇区号写进文件
}
fclose(fp_file_p);
}
void InputPW(char *password) /*input password,use '*' replace*/
{
int j;
for(j=0;j<=7;j++) //密码的长度小于8
{
password[j]=getch(); //获得输入值存入数组
if ((int)(password[j])!=13) //13表示ASCII码，如果不是回车
{
if((int)(password[j])!=8) //如果不是退格
putchar('*'); //就输入J个*号
else //如果是退格
{
if (j>0) //且密码个数大于0
{
j--;
j--;
putchar('\b');putchar(' ');putchar('\b'); //'\b'表示退格，putchar函数只能用于单个字符输出
}
else j--;
}
}
else
{ password[j]='\0'; //\0是字符串的结束符，如果输出完毕则终止
break;
}
}
password[j]='\0';
}
void DirF() /*Dir FileSystem*/
{
int i,j,count=0;
char sfmode[25],sfpaddr[25],str[25];
clrscr();
if (strcmp(strupr(ltrim(rtrim(dirname))),"")!=0)
{
printf("\n\nC:\\%s>dir\n",dirname);
printf("\n%14s%16s%14s%10s%18s\n","FileName","FileAddress","FileLength","Type","FileMode");
j=ExistD(dirname);
for(i=0;i<fcount[j];i++)
{
if ((i%16==0)&&(i!=0))
{
printf("\nPress any key to continue..");
getch();
clrscr();
printf("\n%14s%16s%14s%10s%18s\n","FileName","FileAddress","FileLength","Type","FileMode");
}
/////////////////////////////////////////////////////////
itoa(ufd[j]->ufdfile[i].fpaddr,str,10);
strcpy(sfpaddr,"file");
strcat(sfpaddr,str);
if (ufd[j]->ufdfile[i].fmode==0) strcpy(sfmode,"Read Only");
else if(ufd[j]->ufdfile[i].fmode==1) strcpy(sfmode,"Write Only");
else if(ufd[j]->ufdfile[i].fmode==2)strcpy(sfmode,"Read And Write");
else strcpy(sfmode,"Protect");
printf("%14s%16s%14d%10s%18s\n",ufd[j]->ufdfile[i].fname,sfpaddr,ufd[j]->ufdfile[i].flength,"<FILE>",sfmode);
}
printf("\n %3d file(s)\n",fcount[j]);
}
else
{
printf("\n\nC:\\>dir\n");
printf("\n%14s%18s%8s\n","DirName","OwnFileCount","Type");
for(i=0;i<ucount;i++)
{
if ((i%16==0)&&(i!=0))
{
printf("\nPress any key to continue...");
getch();
clrscr();
printf("\n%14s%18s%8s\n","DirName","OwnFileCount","Type");
}
printf("%14s%18d%8s\n",ufd[i]->ufdname,fcount[i],"<UFD>");
count=count+fcount[i];
}
printf("\n %3d dir(s),%5d file(s)\n",ucount,count);
}
}
int ExistD(char *dirname) /*Whether DirName Exist,Exist-i,Not Exist-0*/
{
int i;
int exist=0;
for(i=0;i<ucount;i++)
if (strcmp(strupr(ufd[i]->ufdname),strupr(dirname))==0)
{
exist=1;
break;
}
if (exist) return(i);
else return(-1);
}
void CdF() /*Exchange Dir*/
{
char dname[MAXNAME];
printf("\nPlease input DirName (cd..-Previous dir; DirNAME-cd [DirNAME]):");
gets(dname);
ltrim(rtrim(dname));
if (ExistD(dname)>=0) strcpy(dirname,strupr(dname));
else
if(strcmp(strupr(dname),"CD..")==0) strcpy(ltrim(rtrim(dirname)),"");
else printf("\nError.\'%s\' does not exist.\n",dname);
}
void CreateF() /*Create File*/
{
int fpaddrno,flag=1,i;
char fname[MAXNAME],str[50],str1[50],a[25];
char fmode[25];
if (strcmp(strupr(dirname),strupr(username))!=0)
{
printf("\nError. You must create file in your own dir.\n");
wgetchar=1;
}
else
{
printf("\nPlease input FileName:");
gets(fname);
ltrim(rtrim(fname));
if (ExistF(fname)>=0)
{
printf("\nError. Name \'%s\' has already existed.\n",fname);
wgetchar=1;
}
else
{
printf("Please input FileMode(0-Read Only, 1-Write Only, 2-Read and Write, 3-Protect):");
gets(fmode);
ltrim(rtrim(fmode));
if((strcmp(fmode,"0")==0)||(strcmp(fmode,"1")==0)||(strcmp(fmode,"2")==0)||(strcmp(fmode,"3")==0))
{
fpaddrno=FindPANo();
if (fpaddrno>=0)
{
i=ExistD(username);
strcpy(ufd[i]->ufdfile[fcount[i]].fname,fname);
ufd[i]->ufdfile[fcount[i]].fpaddr=fpaddrno;
ufd[i]->ufdfile[fcount[i]].fmode=atoi(fmode);
ifopen[i][fcount[i]].ifopen=0;
ifopen[i][fcount[i]].openmode=4;
strcpy(str,"c:\\osfile\\file\\file");
itoa(fpaddrno,str1,10);
strcat(str,str1);
strcat(str,".txt");
fp_file=fopen(str,"wb");
fclose(fp_file);
fcount[i]++;
while(flag)
{
printf("Input text now(Y/N):");
gets(a);
ltrim(rtrim(a));
ufd[i]->ufdfile[fcount[i]-1].flength=0;
if(strcmp(strupr(a),"Y")==0)
{
fp_file=fopen(str,"wb+");
ufd[i]->ufdfile[fcount[i]-1].flength=WriteF1();
flag=0;
}
else if(strcmp(strupr(a),"N")==0)
{
flag=0;
wgetchar=1;
}
}
printf("\n\'%s\' has been created successfully!\n",fname);
}
else
{
printf("\nFail!No Disk Space. Please format your disk.\n");
wgetchar=1;
}
}
else
{
printf("\nError. FileMode\'s Range is 0-3\n");
wgetchar=1;
}
}
}
}
int ExistF(char *filename) /*该函数检测某文件是否存在*/
{
int i,j;
int exist=0;
j=ExistD(dirname);
for(i=0;i<fcount[j];i++)
if (strcmp(strupr(ufd[j]->ufdfile[i].fname),strupr(filename))==0)
{
exist=1;
break;
}
if (exist) return(i);
else return(-1);
}
//找出没有使用的磁盘号，然后加以使用，返回值为该磁盘号
int FindPANo() /*find out physical address num*/
{
int i;
for(i=0;i<MAX;i++)
if (fpaddrno[i]==0) //找到没有使用的磁盘号
{
fpaddrno[i]=1; //然后加以使用
break;
}
if (i<MAX) return(i);
else return(-1);
}
int WriteF1() /*write file*/
{
int length=0;
char c;
printf("Please input text(\'#\' stands for end):\n");
while((c=getchar())!='#')
{
fprintf(fp_file,"%c",c); //传送格式化输出到一个fp_file文件中
if (c!='\n') length++;
}
fprintf(fp_file,"\n");
fclose(fp_file);
return(length);
}
void OpenF() /*打开文件*/
{
int fc, i; //定义两个整型变量
char fname[MAXNAME], fmode[25]; //定义两个字符数组
int fm;
printf("\nPlease enter filename:");
gets(fname); //从键盘获得文件名
ltrim(rtrim(fname)); //出去前后的空格
if(ExistF(fname)<0) //判断文件是否存在
{
printf("\nError.Name\'%s\'is not existed.\n",fname); //文件不存在
wgetchar = 1;
}
else //如果存在文件
{
i = ExistD(username); //获取用户标识
for(int a = 0; a < fcount[i]; a++) //循环检验文件名是否匹配
{
if(strcmp(fname,ufd[i]->ufdfile[a].fname)==0) //如果文件名匹配
{
fc=a; //记住是第几个文件
break;
}
}
ifopen[i][fc].ifopen = 1; //设置ifopen数组的第i个用户的第fc个文件的状态未打开
printf("please input OpenMode(0-Read Only, 1-Write Only, 2-Read and Write, 3-Protect):");
gets(fmode); //得到用户输入的打开权限
fm = atoi(fmode); //字符串转成整型
ifopen[i][fc].openmode = fm; //设置ifopen的打开模式
printf("\nOpen successed");
wgetchar = 1;
}
}
void CloseF() /*关闭文件*/
{
char fname[MAXNAME]; //定义一个字符数组
int i,k;
if(strcmp(strupr(dirname),strupr(username))!=0) //判断所处的目录名是否存在
{
printf("\nerror.you can only moddify filemode in yourself dir.\n"); //只能关闭自己目录下的文件
}
else
{
printf("\nplease enter filename:");
gets(fname); //输入需要关闭的文件名
ltrim(rtrim(fname)); //除去前面和后面的空格
i = ExistF(fname); //获取用户标识
if(i>=0)
{
k = ExistD(username);
if(ifopen[k][i].ifopen==0) //文件已被关闭
{
printf("\nError.Name\'%s\'has been closed.you can not close it again.\n",fname);
}
else //文件关闭成功
{
ifopen[k][i].ifopen=0; //ifopen的状态设为0
ifopen[k][i].openmode=4; //打开状态为4
printf("\'%s\'has been closed successfully!",fname);
}
}
else //文件不存在
{
printf("\nError.Name\'%s\'dose not exist.\n",fname);
}
}
}
void WriteF() /*Write File*/
{
int i,k,m = 0; //定义三个整型变量
int length;
char fname[MAXNAME];
char str[255], str1[255];
if(strcmp(strupr(dirname),strupr(username))!=0) //只能写自己目录下的文件
{
printf("\nerror.please convert to ufd dir before write.\n");
wgetchar=1;
return;
}
printf("\ncaution:open file first\n");
printf("opened file(s) list:\n");
k=ExistD(dirname); //获取目录编号
for(i=0; i<fcount[k]; i++) //列出可以写的文件
{
if(ifopen[k][i].ifopen==1) //如果文件是打开的
{
printf("%15s",ufd[k]->ufdfile[i].fname);
m++;
}
if((m%4==0)&&(m!=0))
printf("\n");
}
printf("\n%d files openned.\n",m);
if(m==0) //没有打开的文件
wgetchar=1;
if(m!=0)
{
printf("\nplease input filename:");
gets(fname); //获得所要写的文件名
ltrim(rtrim(fname)); //除去前面和后面的空格
i=ExistF(fname); //获取文件的编号
if(i>=0) //文件是打开的
{
if(ifopen[k][i].openmode==1 || (ifopen[k][i].openmode==2)) //文件是可写或者可读可写
{
itoa(ufd[k]->ufdfile[i].fpaddr,str,10); //获取文件对应的物理地址
strcpy(str1,"file");
strcat(str1,str);
strcpy(str,"c:\\osfile\\file\\");
strcat(str,str1);
strcat(str,".txt");
fp_file=fopen(str,"ab"); //以二进制只写的方式打开，每次将内容添加到文件内容的末尾
length = WriteF1(); //写入并获得长度
ufd[k]->ufdfile[i].flength=ufd[k]->ufdfile[i].flength+length; //获得总长度
printf("\n\n%d Length.\n",ufd[k]->ufdfile[i].flength);
printf("\n you have write file successfully!");
fclose(fp_file);
wgetchar=0;
}
else if(ifopen[k][i].openmode==0) //文件是只读的
{
printf("\nerror.\'%s\' has been opened with read only mode.it isn\'t write.\n",fname);
wgetchar=1;
}
else //文件是保护的
{
printf("\nerror.\'%s\' has been opened with protect mode . it isn\'t write.\n",fname);
wgetchar=1;
}
}
else //文件是关闭的
{
printf("\nerror.\'%s\' is in closing status.please open it before write\n",fname);
wgetchar=1;
}
}
else //文件不存在
{
printf("\nerror.\'%s\' dose not exist.\n",fname);
wgetchar=1;
}
}
void DeleteF() /*Delete File*/
{
char fname[MAXNAME],str[50],str1[50]; //定义了三个数组
int i, j, k; //定义三个整形变量
int fpaddrno1; //文件的物理地址
if(strcmp(strupr(ltrim(rtrim(dirname))),"")==0) //将获取的文件名的前后空格去掉，再与空格比较
{
printf("\nerror.please convert to ufd dir before delete.\n");
wgetchar = 1;
}
if(strcmp(strupr(dirname),strupr(username))!=0) //无法删除不是自己目录的文件
{
printf("\nerror.you can only modify filemode in youself dir.\n");
wgetchar = 1;
}
else
{
printf("\nplease enter filename:\n");
gets(fname); //从键盘获得要删除的文件名
ltrim(rtrim(fname)); //去除前面和后面的空格
i = ExistF(fname); //得到文件编号
if(i>=0)
{
k = ExistD(username); //获取用户名
if(ifopen[k][i].ifopen==1) //如果文件打开，则无法删除
{
printf("\nerror.\'%s\' is in open status.close it before delete.\n",fname);
wgetchar=1;
}
else
{
if(ufd[k]->ufdfile[i].fmode==3) //保护的文件无法删除
{
printf("error.\'%s\' is in protect status.close it before delete.\n",fname);
wgetchar=1;
}
else
{
fpaddrno1=ufd[k]->ufdfile[i].fpaddr; //获取文件对应的物理文件名
fpaddrno[fpaddrno1]=0; //收回盘块
for(j=i; j<fcount[k]; j++)
{
ufd[k]->ufdfile[j]=ufd[k]->ufdfile[j+1]; //从被删除的文件开始，数组值全部向前移动一个
}
strcpy(str,"c:\\osfile\\file\\file");
itoa(fpaddrno1,str1,10); //将整数转化成字符串
strcat(str,str1); //把str1添加到str结尾处
strcat(str,".txt"); //把.txt添加到str结尾处
remove(str); //删除物理文件
fcount[k]--; //K用户数量减少1
printf("\n \'%s\' is deleted successfully.\n",fname);
wgetchar=1;
}
}
}
else //需要删除的文件不存在
{
printf("\nerror.\'%s\' dose not exist.\n",fname);
wgetchar=1;
}
}
}
void ModifyFM() /*Modify FileMode*/
{
char fname[MAXNAME],str[50];
int i,k;
char fmode[25]; /*whether delete*/
if (strcmp(strupr(dirname),strupr(username))!=0)
{
printf("\nError.You can only modify filemode in yourself dir.\n");
wgetchar=1;
}
else
{
printf("\nPlease input FileName:");
gets(fname);
ltrim(rtrim(fname));
i=ExistF(fname);
if (i>=0)
{
k=ExistD(username);
if(ifopen[k][i].ifopen==1)
{
printf("\nError.\'%s\' is in open status. Close it before modify.\n",fname);
wgetchar=1;
}
else
{
if(ufd[k]->ufdfile[i].fmode==0) strcpy(str,"read only"); /*FileMode*/
else if(ufd[k]->ufdfile[i].fmode==1) strcpy(str,"write only");
else if(ufd[k]->ufdfile[i].fmode==2) strcpy(str,"read and write");
else strcpy(str,"Protect");
printf("\'%s\' filemode is %s.\n",fname,strupr(str));
printf("Modify to(0-read only,1-write only,2-read and write,3-Protect):");
gets(fmode);
ltrim(rtrim(fmode));
if(strcmp(fmode,"0")==0)
{
ufd[k]->ufdfile[i].fmode=0;
printf("\n\'%s\' has been modified to READ ONLY mode successfully.\n",fname);
wgetchar=1;
}
else if(strcmp(fmode,"1")==0)
{
ufd[k]->ufdfile[i].fmode=1;
printf("\n\'%s\' has been modified to WRITE ONLY mode successfully.\n",fname);
wgetchar=1;
}
else if(strcmp(fmode,"2")==0)
{
ufd[k]->ufdfile[i].fmode=2;
printf("\n\'%s\' has been modified to READ AND WRITE mode successfully.\n",fname);
wgetchar=1;
}
else if(strcmp(fmode,"3")==0)
{
ufd[k]->ufdfile[i].fmode=3;
printf("\n\'%s\' has been modified to FORBID mode successfully.\n",fname);
wgetchar=1;
}
else
{
printf("\nError.\'%s\' is not modified.\n",fname);
wgetchar=1;
}
}
}
else
{
printf("\nError. \'%s\' dose not exist.\n",fname);
wgetchar=1;
}
}
}
void ReadF() /*Read File*/
{
int i,k,n=0;
char fname[MAXNAME];
char str[255],str1[255],c;
if (strcmp(strupr(ltrim(rtrim(dirname))),"")==0)
{
printf("\nError.Please convert to ufd dir before read.\n");
wgetchar=1;
return;
}
printf("\nCaution:Open file first\n");
printf("Opened File(s) List:\n");
k=ExistD(dirname);
for(i=0;i<fcount[k];i++)
{
if (ifopen[k][i].ifopen==1)
if ((ifopen[k][i].openmode==0) ||(ifopen[k][i].openmode==2))
{
printf("%15s",ufd[k]->ufdfile[i].fname);
n++;
}
if((n%4==0)&&(n!=0)) printf("\n");
}
printf("\n%d files openned.\n",n);
if (n==0) wgetchar=1;
if(n!=0)
{
printf("\nPlease input FileName:");
gets(fname);
ltrim(rtrim(fname));
i=ExistF(fname);
if(i>=0)
{
if(ifopen[k][i].ifopen==1)
{
if((ifopen[k][i].openmode==0) ||(ifopen[k][i].openmode==2))
{
itoa(ufd[k]->ufdfile[i].fpaddr,str,10);
strcpy(str1,"file");
strcat(str1,str);
strcpy(str,"c:\\osfile\\file\\");
strcat(str,str1);
strcat(str,".txt");
fp_file=fopen(str,"rb");
fseek(fp_file,0,0);
printf("\nThe text is:\n\n");
printf(" ");
while(fscanf(fp_file,"%c",&c)!=EOF)
if (c=='\n') printf("\n ");
else printf("%c",c);
printf("\n\n%d Length.\n",ufd[k]->ufdfile[i].flength);
fclose(fp_file);
wgetchar=1;
}
else
{
printf("\nError.\'%s\' has been opened with WRITE ONLY mode. It isn\'t read.\n",fname);
wgetchar=1;
}
}
else
{
printf("\nError.\'%s\' is in closing status. Please open it before read\n",fname);
wgetchar=1;
}
}
else
{
printf("\nError. \'%s\' does not exist.\n",fname);
wgetchar=1;
}
}
}
void QuitF() /*Quit FileSystem*/
{
int i,j;
char str[50];
SetPANo(1);
if (fp_mfd!=NULL) fclose(fp_mfd);
if (fp_ufd!=NULL) fclose(fp_ufd);
if (fp_file!=NULL) fclose(fp_file);
for(j=0;j<ucount;j++)
{
strcpy(str,"c:\\osfile\\");
strcat(str,ufd[j]->ufdname);
ltrim(rtrim(str));
strcat(str,".txt");
fp_ufd=fopen(str,"wb");
fclose(fp_ufd);
fp_ufd=fopen(str,"ab");
for(i=0;i<fcount[j];i++)
fwrite(&ufd[j]->ufdfile[i],sizeof(OSFILE),1,fp_ufd);
fclose(fp_ufd);
}
}
【测试结果】
1.创建和打开文件
2.写入文件
3.关闭和删除文件
【设计总结】
这次操作系统的课程设计是设计二级文件系统，虽然只有短短的两周时间，还是在考试周，时间非常的短暂，但是我从中学到了很多课本以外的知识，在课设中并不是一帆风顺，课设中需要很多的专业知识，遇到了很多的问题，通过问老师，问同学还有网上查找资料解决了，在编写程序的过程中老师还要求我们养成良好的注释习惯，方便其他人理解程序。通过这次的课设感觉自己还欠缺很多的东西，在以后我会看更多的书籍，来丰富自己的知识。
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