操作系统实验2报告

1、 北京联合大学 信息学院 计 算 机 操 作 系 统 实 训 报 告 实 验 序 号：003 姓 名： 学 号： 班 级： 专 业：一：实验题目：模拟文件管理二：设计思想： 文件系统采用两级目录，其中第一级对应于用户账号，第二级对应于用户帐号下的文件。首先应确定文件系统的数据结构：主目录、子目录及活动文件等。主目录和子目录都以文件的形式存放于磁盘，这样便于查找和修改。用户创建的文件，可以编号存储于磁盘上。如：file0,file1,file2并以编号作为物理地址，在目录中进行登记。实现功能：login 用户登录 dir 列目录 modify 修改文件属性 create 创建文件 delete

2、删除文件 open 打开文件 close 关闭文件 read 读文件 write 写文件 cd 更改目录三：数据结构typedef struct /*定义文件*/int fpaddr; /*文件地址*/ int flength; /*文件长度*/ int fmode; /*文件属性:0-Read Only;1-Write Only;2-Read and Write; 3-Protect;*/ char fnameMAXNAME; /*文件名*/ OSFILE;typedef struct /*the structure of OSUFD定义用户文件目录*/char ufdnameMAXNAME

3、; /*ufd name*/OSFILE ufdfileMAXCHILD; /*ufd own file*/OSUFD;typedef struct /*the structure of OSUFDLOGIN定义登陆*/char ufdnameMAXNAME; /*ufd name*/ char ufdpword8; /*ufd password*/ OSUFD_LOGIN;typedef struct /*file open mode定义操作方式*/int ifopen; /*ifopen:0-close,1-open*/ int openmode; /*0-read only,1-writ

4、e only,2-read and write,3-protect*/OSUFD_OPENMODE;四：定义函数void LoginF(); /*登录文件系统*/void DirF(); /*显示系统目录*/void CreateF(); /*创建文件*/void DeleteF(); /*删除文件*/void ModifyFM(); /*修改文件属性*/void OpenF(); /*打开文件*/void CloseF(); /*关闭文件*/void ReadF(); /*读文件*/void WriteF(); /*写文件*/void QuitF(); /*退出*/void CdF(); /

5、*更改目录名称*/void help();登录函数void LoginF() /*LOGIN FileSystem登陆函数*/char loginameMAXNAME,loginpw9,logincpw9,str50;/loginpw-输入密码，logincpw-确认输入密码,str50存放地址int i,j,flag=1;char a25;int findout; /*login user not exist*/while(1)findout=0;printf(nnLogin Name:);gets(loginame);/把用户名写入系统ltrim(rtrim(loginame);fp_mf

6、d=fopen(d:osfilemfd.txt,rb);/打开文件mfdfor(i=0;fread(&ufd_lp,sizeof(OSUFD_LOGIN),1,fp_mfd)!=0;i+)if (strcmp(strupr(ufd_lp.ufdname),strupr(loginame)=0)/两者相等findout=1;strcpy(logincpw,ufd_lp.ufdpword);fclose(fp_mfd);/关闭mfd文件if (findout=1) /*user exist该用户存在*/printf(Login Password:);/*用户密码输入*/InputPW(loginp

7、w); /*input password,use * replace*/if (strcmp(loginpw,logincpw)=0)/相等strcpy(username,strupr(loginame);strcpy(dirname,username);fp_mfd=fopen(d:osfilemfd.txt,rb);for(j=0;fread(&ufd_lp,sizeof(OSUFD_LOGIN),1,fp_mfd)!=0;j+)/记录用户名strcpy(str,d:osfile);strcat(str,ufd_lp.ufdname);/*strcat(dest,char)添加char到d

8、est结尾处*/strcat(str,.txt);ufdj=(OSUFD*)malloc(sizeof(OSUFD);/malloc向系统申请分配指定size个字节的内存空间分配二级文件空间strcpy(ufdj-ufdname,strupr(ufd_lp.ufdname);fp_ufd=fopen(str,rb);fcountj=0;/当前用户文件数目for(i=0;fread(&ufdj-ufdfilei,sizeof(OSFILE),1,fp_ufd)!=0;i+,fcountj+)/记录用户文件ifopenji.ifopen=0;ifopenji.openmode=4;fclose(f

9、p_ufd);fclose(fp_mfd);ucount=j;SetPANo(0);printf(nnLogin successful! Welcome to this FileSystemnn);loginsuc=1;return;else/不相等printf(nn);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)

10、,N)=0)loginsuc=0;flag=0;return;else/*user not exist*/printf(New Password(=8):);InputPW(loginpw); /*input new password,use * replace*/printf(nConfirm Password(ufdname,strupr(ufd_lp.ufdname);fp_ufd=fopen(str,rb);for(i=0;fread(&ufdj-ufdfilei,sizeof(OSFILE),1,fp_ufd)!=0;i+,fcountj+)/记录用户文件ifopenji.ifope

11、n=0;ifopenji.openmode=4;fclose(fp_ufd);fclose(fp_mfd);ucount=j;SetPANo(0);printf(nnLogin Successful! Welcome to this Systemnn);loginsuc=1;return;else/不相等printf(nn);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;fla

12、g=0;else if(strcmp(strupr(a),N)=0)loginsuc=0;flag=0;return;显示系统目录void DirF() /*Dir FileSystem主目录*/int i,j,count=0;char sfmode25,sfpaddr25,str25;clrscr();if (strcmp(strupr(ltrim(rtrim(dirname),)!=0)/不为空printf(nnd:%sdirn,dirname);printf(n%14s%16s%14s%10s%18sn,FileName,FileAddress,FileLength,Type,FileM

13、ode);j=ExistD(dirname);for(i=0;iufdfilei.fpaddr,str,10);/itoa()把整数转换为字符串strcpy(sfpaddr,file);strcat(sfpaddr,str);if (ufdj-ufdfilei.fmode=0) strcpy(sfmode,Read Only);else if(ufdj-ufdfilei.fmode=1) strcpy(sfmode,Write Only);else if(ufdj-ufdfilei.fmode=2)strcpy(sfmode,Read And Write);else strcpy(sfmode

14、,Protect);printf(%14s%16s%14d%10s%18sn,ufdj-ufdfilei.fname,sfpaddr,ufdj-ufdfilei.flength,sfmode);printf(n %3d file(s)n,fcountj);else/空printf(nnd:dirn);printf(n%14s%18s%8sn,DirName,OwnFileCount,Type);for(i=0;iufdname,fcounti,);count=count+fcounti;printf(n %3d dir(s),%5d file(s)n,ucount,count);创建文件voi

15、d CreateF() /*Create File*/int fpaddrno,flag=1,i;char fnameMAXNAME,str50,str150,a25;char fmode25;if (strcmp(strupr(dirname),strupr(username)!=0)/目录名与用户名不相等printf(nError. You must create file in your own dir.n);wgetchar=1;elseprintf(nPlease input FileName:);gets(fname);ltrim(rtrim(fname);if (ExistF(f

16、name)=0)printf(nError. Name %s has already existed.n,fname);wgetchar=1;elseprintf(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 (fp

17、addrno=0)/找地址i=ExistD(username);strcpy(ufdi-ufdfilefcounti.fname,fname);/记录ufdi-ufdfilefcounti.fpaddr=fpaddrno;ufdi-ufdfilefcounti.fmode=atoi(fmode);ifopenifcounti.ifopen=0;ifopenifcounti.openmode=4;strcpy(str,d:osfilefilefile);itoa(fpaddrno,str1,10);strcat(str,str1);strcat(str,.txt);fp_file=fopen(s

18、tr,wb);fclose(fp_file);fcounti+;while(flag)printf(Input text now(Y/N):);gets(a);ltrim(rtrim(a);ufdi-ufdfilefcounti-1.flength=0;if(strcmp(strupr(a),Y)=0)fp_file=fopen(str,wb+);/写入二进制文件ufdi-ufdfilefcounti-1.flength=WriteF1();flag=0;else if(strcmp(strupr(a),N)=0)flag=0;wgetchar=1;printf(n%s has been cr

19、eated successfully!n,fname);elseprintf(nFail!No Disk Space. Please format your disk.n);wgetchar=1;else printf(nError. FileModes Range is 0-3n);wgetchar=1;删除文件：void DeleteF() /*Delete File*/ char fnameMAXNAME,str50,str150;int i,k,j;int fpaddrno1; if (strcmp(strupr(ltrim(rtrim(dirname),)=0) /*无法删除主目录的

20、文件*/printf(nError.Please convert to ufd dir before delete.n);wgetchar=1;if (strcmp(strupr(dirname),strupr(username)!=0) /*无法删除非自己目录的文件*/printf(nError.You can only modify filemode in yourself dir.n);wgetchar=1;elseprintf(nPlease input FileName:);gets(fname);/从键盘获取所要删除的文件名ltrim(rtrim(fname);i=ExistF(f

21、name);/获取文件编号if (i=0)k=ExistD(username);if(ifopenki.ifopen=1)/*文件打开时无法删除*/printf(nError.%s is in open status. Close it before delete.n,fname);wgetchar=1;else if(ufdk-ufdfilei.fmode=3)/*被保护的文件无法删除*/ printf(nError.%s is in protect status.The file can not be deleted!.n,fname);wgetchar=1; else fpaddrno1

22、=ufdk-ufdfilei.fpaddr;/获取文件对应的物理文件名fpaddrnofpaddrno1=0;/回收盘块for(j=i;jufdfilej=ufdk-ufdfilej+1;/从被删除的文件号开始，数组值全部前移一个 strcpy(str,d:osfilefilefile);itoa(fpaddrno1,str1,10);/整数转化成字符串strcat(str,str1);strcat(str,.txt);remove(str);/删除物理文件fcountk-;/用户文件数量少1printf(n %sis deleted successfully.n,fname);wgetcha

23、r=1;else/所要删除的文件不存在printf(nError. %s dose not exist.n,fname);wgetchar=1; 修改文件属性void ModifyFM() /*Modify FileMode*/char fnameMAXNAME,str50;int i,k;char fmode25; /*whether delete*/if (strcmp(strupr(dirname),strupr(username)!=0) printf(nError.You can only modify filemode in yourself dir.n);wgetchar=1;e

24、lse printf(nPlease input FileName:);gets(fname);ltrim(rtrim(fname);i=ExistF(fname);if (i=0)k=ExistD(username);if(ifopenki.ifopen=1)printf(nError.%s is in open status. Close it before modify.n,fname);wgetchar=1;elseif(ufdk-ufdfilei.fmode=0) strcpy(str,read only); /*FileMode*/else if(ufdk-ufdfilei.fmo

25、de=1) strcpy(str,write only);else if(ufdk-ufdfilei.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)ufdk-ufdfilei.fmode

26、=0;printf(n%s has been modified to READ ONLY mode successfully.n,fname);wgetchar=1;else if(strcmp(fmode,1)=0)ufdk-ufdfilei.fmode=1;printf(n%s has been modified to WRITE ONLY mode successfully.n,fname);wgetchar=1;else if(strcmp(fmode,2)=0)ufdk-ufdfilei.fmode=2;printf(n%s has been modified to READ AND

27、 WRITE mode successfully.n,fname);wgetchar=1;else if(strcmp(fmode,3)=0)ufdk-ufdfilei.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;elseprintf(nError. %s dose not exist.n,fname);wgetchar=1;打开文件void OpenF(

28、) /*Open File*/ char fnameMAXNAME;int i,k,j; if (strcmp(strupr(dirname),strupr(username)!=0) /*在自己的目录里才能打开*/printf(nError.You can only open in yourself dir.n);wgetchar=1;else k=ExistD(username); for(j=0;jufdfilej.fname); printf(nPlease input FileName:);gets(fname);/获取所要打开的文件名ltrim(rtrim(fname);i=Exi

29、stF(fname);/获取目录编号if (i=0)if(ifopenki.ifopen=1)/输入的文件是打开的printf(nError.%s is in open status.n,fname);wgetchar=1;else ifopenki.ifopen=1;/修改为打开的if(ufdk-ufdfilei.fmode=0)/*根据文件的模式设置打开模式*/ ifopenki.openmode=0;else if(ufdk-ufdfilei.fmode=1)ifopenki.openmode=1;else if(ufdk-ufdfilei.fmode=2) ifopenki.openm

30、ode=2;else ifopenki.openmode=3;printf(n%s is opened successfullyn,fname);wgetchar=1;else/文件不存在printf(nError. %s dose not exist.n,fname);wgetchar=1;关闭文件void CloseF() /*Close File*/char fnameMAXNAME;int i,k,j; if (strcmp(strupr(dirname),strupr(username)!=0) /*不在自己的目录里没法进行*/printf(nError.You can only c

31、lose file in yourself dir.n);wgetchar=1;else k=ExistD(username); for(j=0;jufdfilej.fname); printf(nPlease input FileName:);gets(fname);/从键盘上读入所要关闭的文件ltrim(rtrim(fname);i=ExistF(fname);/获取文件编号if (i=0)ifopenki.ifopen=0;/关闭文件printf(n %s closed successfullyn,fname);wgetchar=1;else/所要关闭的文件不存在printf(nErro

32、r. %s dose not exist.n,fname);wgetchar=1;读文件void ReadF() /*Read File*/int i,k,n=0;char fnameMAXNAME;char str255,str1255,c;if (strcmp(strupr(dirname),strupr(username)!=0)/必须在自己的目录内printf(nError.Please convert to your own dir before read.n);return;elseprintf(nCaution:Open file firstn); printf(Opened F

33、ile(s) List:n); k=ExistD(dirname);for(i=0;iufdfilei.fname);n+;if(n%4=0)&(n!=0) printf(n);printf(n%d files openned.n,n);if (n=0) wgetchar=1;/如果没有打开的文件if(n!=0)printf(nPlease input FileName:);gets(fname);ltrim(rtrim(fname);i=ExistF(fname);if(i=0)if(ifopenki.ifopen=1)if(ifopenki.openmode=0) |(ifopenki.o

34、penmode=2)/如果文件只读或者读写itoa(ufdk-ufdfilei.fpaddr,str,10); strcpy(str1,file); strcat(str1,str); strcpy(str,d:osfilefile); strcat(str,str1); strcat(str,.txt); fp_file=fopen(str,rb); fseek(fp_file,0,0); printf(nThe text is:nn); printf( );while(fscanf(fp_file,%c,&c)!=EOF)if (c=n) printf(n );else printf(%c

35、,c);printf(nn%d Length.n,ufdk-ufdfilei.flength);fclose(fp_file);else if(ifopenki.openmode=1)/如果文件只写printf(nError.%s has been opened with WRITE ONLY mode. It isnt read.n,fname);else/如果文件保护printf(nError.%s has been opened with PROTECT mode. It isnt read.n,fname);else printf(nError.%s is in closing sta

36、tus. Please open it before readn,fname);elseprintf(nError. %s does not exist.n,fname);写文件void WriteF() /*Write File*/int i,k,n=0;int length;char fnameMAXNAME,values1000;char str255,str1255,c;if (strcmp(strupr(dirname),strupr(username)!=0) /只能写自己目录下的文件printf(nError.Please convert to your own dir befo

37、re write.n);elsek=ExistD(dirname);/获取目录编号printf(nCaution:Open file firstn); printf(Opened File(s) List:n); for(i=0;iufdfilei.fname);n+;if(n%4=0)&(n!=0) printf(n);printf(n%d files openned.n,n);if (n=0) wgetchar=1;/没有打开的文件if(n!=0)printf(nPlease input FileName:);gets(fname);/从键盘获取所要写的文件ltrim(rtrim(fname);i=ExistF(fname);/获取文件编号if(i=0)if(ifopenki.ifopen=1)/如果文件是打开if(ifopenki.openmode=1) |(ifopenki.openmode=2)/文件是只写，或者是可读可写的itoa(ufdk-ufdfilei.fpaddr,str,10);/获取文件对应的物理地址 strcpy(str1,file); strcat(str1,str); strcpy(st