2022年操作系统文件管理实验 .pdf

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1、实验五文件管理实验实验名称：文件管理实验仪器、设备：计算机参考资料：操作系统实验指导书实验目的：设计一个n 个用户的文件系统，用户在一次运行中只能打开一个文件，有Create、delete、open、close、read、write等命令。实验内容：为 DOS 系统设计一个简单的二级文件系统。要求可以实现下列几条命令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 写文件实验原理、数据（程序）记录：#define MAXNAME 25 /*the largest length of mfdname,ufdname,filename*/

2、#define MAXCHILD 50/*the largest child*/#define MAX(MAXCHILD*MAXCHILD)/*the size of fpaddrno*/void CreateF()/*Create File*/int fpaddrno,flag=1,i;char fnameMAXNAME,str50,str150,strtext255,a25;char fmode25;int FindPANo();/*find out physical address num*/int WriteF1();/*write file*/int ExistF(char*file

3、name);/*Whether FileName Exist,Exist-i,Not Exist-0*/int ExistD(char*dirname);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

4、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)名师资料总结-精品资料欢迎下载-名师精心整理-第 1 页，共 9 页 -|(strcmp(fmode,3)=0)fpaddrno=FindPANo();if(fpad

5、drno=0)i=ExistD(username);strcpy(ufdi-ufdfilefcounti.fname,fname);ufdi-ufdfilefcounti.fpaddr=fpaddrno;ufdi-ufdfilefcounti.fmode=atoi(fmode);ifopenifcounti.ifopen=0;ifopenifcounti.openmode=4;strcpy(str,c:osfilefilefile);itoa(fpaddrno,str1,10);strcat(str,str1);fp_file=fopen(str,wb);fclose(fp_file);fco

6、unti+;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+);ufdi-ufdfilefcounti-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 p

7、rintf(nFail!No Disk Space.Please format your disk.n);wgetchar=1;else printf(nError.FileModes Range is 0-3n);wgetchar=1;int ExistF(char*filename)/*Whether FileName Exist,Exist-i,Not Exist-0*/int i,j;int exist=0;int ExistD(char*dirname);j=ExistD(dirname);for(i=0;iufdfilei.fname),strupr(filename)=0)exi

8、st=1;break;if(exist)return(i);else return(-1);名师资料总结-精品资料欢迎下载-名师精心整理-第 2 页，共 9 页 -int FindPANo()/*find out physical address num*/int i;for(i=0;iMAX;i+)if(fpaddrnoi=0)fpaddrnoi=1;break;if(i=0)k=ExistD(username);if(ifopenki.ifopen=1)printf(nError.%s is in open status.Close it before delete.n,fname);wg

9、etchar=1;else while(flag)名师资料总结-精品资料欢迎下载-名师精心整理-第 3 页，共 9 页 -printf(%s will be deleted.Are you sure(Y/N):,fname);gets(a);ltrim(rtrim(a);if(strcmp(strupr(a),Y)=0)fpaddrnoufdk-ufdfilei.fpaddr=0;itoa(ufdk-ufdfilei.fpaddr,str,10);for(j=i;jufdfilej.fname,ufdk-ufdfilej+1.fname);ufdk-ufdfilej.fpaddr=ufdk-u

10、fdfilej+1.fpaddr;ufdk-ufdfilej.flength=ufdk-ufdfilej+1.flength;ufdk-ufdfilej.fmode=ufdk-ufdfilej+1.fmode;ifopenkj=ifopenkj+1;fcountk-;strcpy(str1,c:osfilefilefile);strcat(str1,str);remove(str1);flag=0;printf(n%s has been deleted successfully.n,fname);wgetchar=1;else if(strcmp(strupr(a),N)=0)printf(n

11、Error.%s hasnt been deleted.n,fname);wgetchar=1;flag=0;else printf(nError.%s does not exist.n,fname);wgetchar=1;*void OpenF()/*Open File*/char fnameMAXNAME;char str25,str125,fmode25;int i,k;char*rtrim(char*str);/*remove the trailing blanks.*/char*ltrim(char*str);/*remove the heading blanks.*/int Exi

12、stF(char*filename);/*Whether FileName Exist,Exist-i,Not Exist-0*/int ExistD(char*dirname);if(strcmp(strupr(ltrim(rtrim(dirname),)=0)printf(nError.Please change to ufd dir before open.n);wgetchar=1;return;printf(nPlease input FileName:);gets(fname);ltrim(rtrim(fname);i=ExistF(fname);名师资料总结-精品资料欢迎下载-名

13、师精心整理-第 4 页，共 9 页 -if(i=0)k=ExistD(dirname);if(!ifopenki.ifopen)if(ufdk-ufdfilei.fmode=3)printf(nError.The files mode is FORBID.Can not open.n);wgetchar=1;else printf(Please input FileOpenMode(0-Read Only,1-Write Only,2-Read and Write):);gets(fmode);ltrim(rtrim(fmode);if(strcmp(fmode,0)=0)|(strcmp(f

14、mode,1)=0)|(strcmp(fmode,2)=0)if(fmode0=0)/*open file with read only mode*/strcpy(str,read only);if(ufdk-ufdfilei.fmode=0)|(ufdk-ufdfilei.fmode=2)ifopenki.ifopen=1;else if(fmode0=1)/*open file with write only mode*/strcpy(str,write only);if(ufdk-ufdfilei.fmode=1)|(ufdk-ufdfilei.fmode=2)ifopenki.ifop

15、en=1;else if(fmode0=2)/*open file with read and write mode*/strcpy(str,read and write);if(ufdk-ufdfilei.fmode=2)ifopenki.ifopen=1;if(ufdk-ufdfilei.fmode=0)strcpy(str1,read only);/*FileMode*/else if(ufdk-ufdfilei.fmode=1)strcpy(str1,write only);else if(ufdk-ufdfilei.fmode=2)strcpy(str1,read and write

16、);if(ifopenki.ifopen=1)ifopenki.openmode=atoi(fmode);if(ifopenki.openmode=0)strcpy(str,read only);else if(ifopenki.openmode=1)strcpy(str,write only);else if(ifopenki.openmode=2)strcpy(str,read and write);printf(n%s has been opened.OpenMode is%s,FileMode is%sn,fname,strupr(str),strupr(str1);wgetchar=

17、1;else printf(nError.%s hasnt been opened.OpenMode Error.OpenMode is%s,but FileMode is%sn,fname,strupr(str),strupr(str1);wgetchar=1;else printf(nError.FileOpenModes Range is 0-2n);wgetchar=1;else printf(nError.%s is in open status.n,fname);wgetchar=1;else printf(nError.%s does not exist.n,fname);wge

18、tchar=1;名师资料总结-精品资料欢迎下载-名师精心整理-第 5 页，共 9 页 -*void CloseF()/*Close File*/int i,k,n=0;char fnameMAXNAME;char*rtrim(char*str);/*remove the trailing blanks.*/char*ltrim(char*str);/*remove the heading blanks.*/int ExistF(char*filename);/*Whether FileName Exist,Exist-i,Not Exist-0*/int ExistD(char*dirname

19、);if(strcmp(strupr(ltrim(rtrim(dirname),)=0)printf(nError.Please convert to ufd dir before close.n);wgetchar=1;return;k=ExistD(dirname);printf(nOpen File(s)In This Ufd:n);/*display openned file*/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;if(

20、n!=0)printf(nPlease input FileName:);gets(fname);ltrim(rtrim(fname);i=ExistF(fname);if(i=0)if(ifopenki.ifopen=1)ifopenki.ifopen=0;ifopenki.openmode=4;printf(n%s has been closed successfully.n,fname);wgetchar=1;else printf(nError.%s is in closing status.n,fname);wgetchar=1;else printf(nError.%s is no

21、t exist.n,fname);wgetchar=1;*void ReadF()/*Read File*/int i,k,n=0;char fnameMAXNAME;char str255,str1255,c;char*rtrim(char*str);/*remove the trailing blanks.*/char*ltrim(char*str);/*remove the heading blanks.*/int ExistF(char*filename);/*Whether FileName Exist,Exist-i,Not Exist-0*/int ExistD(char*dir

22、name);if(strcmp(strupr(ltrim(rtrim(dirname),)=0)printf(nError.Please convert 名师资料总结-精品资料欢迎下载-名师精心整理-第 6 页，共 9 页 -to ufd dir before read.n);wgetchar=1;return;printf(nCaution:Open file firstn);printf(Opened File(s)List:n);k=ExistD(dirname);for(i=0;iufdfilei.fname);n+;if(n%4=0)&(n!=0)printf(n);printf(n

23、%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(ifopenki.ifopen=1)if(ifopenki.openmode=0)|(ifopenki.openmode=2)itoa(ufdk-ufdfilei.fpaddr,str,10);strcpy(str1,file);strcat(str1,str);strcpy(str,c:osfilefile);strcat

24、(str,str1);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,c);printf(nn%d Length.n,ufdk-ufdfilei.flength);fclose(fp_file);wgetchar=1;else printf(nError.%s has been opened with WRITE ONLY mode.It isnt read.n,f

25、name);wgetchar=1;else printf(nError.%s is in closing status.Please open it before readn,fname);wgetchar=1;else printf(nError.%s does not exist.n,fname);wgetchar=1;名师资料总结-精品资料欢迎下载-名师精心整理-第 7 页，共 9 页 -*void WriteF()/*Write File*/int i,k,n=0;char fnameMAXNAME;char str50,str150,a50;char*rtrim(char*str);

26、/*remove the trailing blanks.*/char*ltrim(char*str);/*remove the heading blanks.*/int ExistF(char*filename);/*Whether FileName Exist,Exist-i,Not Exist-0*/int ExistD(char*dirname);int WriteF1();/*write file*/if(strcmp(strupr(ltrim(rtrim(dirname),)=0)printf(nError.Please convert to ufd dir before writ

27、e.n);wgetchar=1;return;k=ExistD(dirname);printf(nOpen File(s)with write only mode or read and write mode:n);/*display openned files with writable mode*/for(i=0;iufdfilei.fname);n+;if(n%4=0)&(n!=0)printf(n);printf(n%d files open.n,n);if(n=0)wgetchar=1;if(n!=0)printf(nPlease input FileName:);gets(fnam

28、e);ltrim(rtrim(fname);i=ExistF(fname);if(i=0)if(ifopenki.ifopen=1)if(ifopenki.openmode=1)|(ifopenki.openmode=2)itoa(ufdk-ufdfilei.fpaddr,str,10);strcpy(str1,file);strcat(str1,str);strcpy(str,c:osfilefile);strcat(str,str1);if(ufdk-ufdfilei.flength!=0)printf(n%s has text.Overwrite or Append(O-overwrit

29、e,A-Append,else-not write):,fname);gets(a);ltrim(rtrim(a);名师资料总结-精品资料欢迎下载-名师精心整理-第 8 页，共 9 页 -if(fp_file!=NULL)fclose(fp_file);if(strcmp(strupr(a),O)=0)printf(nOverwriten);fp_file=fopen(str,wb);ufdk-ufdfilei.flength=0;ufdk-ufdfilei.flength=WriteF1();else if(strcmp(strupr(a),A)=0)printf(nAppendn);fp_

30、file=fopen(str,ab);ufdk-ufdfilei.flength=ufdk-ufdfilei.flength+WriteF1();else printf(nError.%s has not been written.n,fname);fclose(fp_file);wgetchar=1;else fp_file=fopen(str,wb);ufdk-ufdfilei.flength=WriteF1();else printf(nError.%s has been opened with read only mode.It isnt writed.n,fname);wgetchar=1;else printf(nError.%s is in closing status.Please open it before writen,fname);wgetchar=1;else printf(nError.%s does not exist.n,fname);wgetchar=1;实验结果及分析通过实验实现了有Create、delete、open、close、read、write等命令的简单的文件系统。名师资料总结-精品资料欢迎下载-名师精心整理-第 9 页，共 9 页 -