实验 文件管理二.docx
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实验文件管理二
实验六:
文件系统
一、目的要求
1、用高级语言编写和调试一个简单的文件系统,模拟文件管理的工作过程。
从而对各种文件操作命令的实质内容和执行过程有比较深入的了解。
2、要求设计一个n个用户的文件系统,每次用户可保存m个文件,用户在一次运行中只能打开一个文件,对文件必须设置保护措施,且至少有Create、delete、open、close、read、write等命令。
二、例题:
①设计一个10个用户的文件系统,每次用户可保存10个文件,一次运行用户可以打开5个文件。
②程序采用二级文件目录(即设置主目录[MFD])和用户文件目录(UED)。
另外,为打开文件设置了运行文件目录(AFD)。
③为了便于实现,对文件的读写作了简化,在执行读写命令时,只需改读写指针,并不进行实际的读写操作。
④算法与框图:
a、因系统小,文件目录的检索使用了简单的线性搜索。
b、文件保护简单使用了三位保护码:
允许读写执行、对应位为1,对应位为0,则表示不允许读写、执行。
c、程序中使用的主要设计结构如下:
Ⅰ、主文件目录和用户文件目录(MFD、UFD)
Ⅱ、打开文件目录(AFD)(即运行文件目录)
MDF
用户名
文件目录指针
UFD
文件名
保护码
文件长度
AFD
打开文件名
打开保护码
读写指针
三、调度算法的流程图
四、文件管理源程序
#include<>
typedefstructufd
{charfilename[10];/*文件名*/
charprocode[8];/*属性*/
intlength;/*文件长度*/
structufd*nextfile;/*指向下一个文件*/
}UFD;
typedefstructmfd
{charusername[10];/*用户名*/
structufd*link;/*指向该用户的第一个文件*/
}MFD;
typedefstructprotected_flag
{charcode[4];
}PRO;
typedefstructafd/*运行文件目录*/
{charfilename[10];/*打开文件名*/
charprocode[4];
intrwpointer;/*读写指针*/
}AFD;
PROflag[3]={"100",/*只读*/
"110",/*读写*/
"001"/*可执行*/
};
UFD*rw_pointer;/*读写指针*/
AFD*afd=NULL;
MFDfilesystem[10];
intnum;/*当前用户个数*/
voiddisplayallfile()
{inti;
UFD*p;
for(i=0;i{printf("用户:%s目录如下!\n",filesystem[i].username);p=filesystem[i].link;while(p){printf("\t文件名:%s\t||",p->filename);printf("文件属性:%s\t||",p->procode);printf("文件长度:%d\n\n",p->length);p=p->nextfile;}}}voidinput()/*建立用户文件系统*/{inti,j;intlength;charfilename[10];charprocode[4];UFD*p1,*p2,*first;for(i=0;i<10;i++)filesystem[i].link=NULL;printf("用户号码:\n");scanf("%d",&num);for(i=0;i{printf("输入第%d个用户名:\n",i+1);scanf("%s",filesystem[i].username);}for(i=0;i{j=1;printf("第%d个用户的文件如下\n",i+1);printf("文件%d:\n",j);printf("长度:");scanf("%d",&length);if(!length)continue;printf("文件名:");scanf("%s",filename);printf("文件属性(100只读,110读写,001可执行)");scanf("%s",procode);first=(UFD*)malloc(sizeof(UFD));first->nextfile=NULL;strcpy(first->filename,filename);strcpy(first->procode,procode);first->length=length;p1=p2=first;j++;while(1){printf("文件%d:\n",j);printf("长度:");scanf("%d",&length);if(!length)break;printf("文件名:");scanf("%s",filename);printf("属性(100只读,110读写,001可执行):");scanf("%s",procode);p2=(UFD*)malloc(sizeof(UFD));p2->nextfile=NULL;strcpy(p2->filename,filename);strcpy(p2->procode,procode);p2->length=length;j++;p1->nextfile=p2;p1=p1->nextfile;}filesystem[i].link=first;}displayallfile();}intfindusername(char*username)/*返回用户名下标,当I=NUM时,用户不存在*/{inti;i=0;while(i{if(!strcmp(filesystem[i].username,username))break;i++;}returni;}UFD*findfilename(char*filename,UFD*filepointer){UFD*k;k=filepointer;while(k&&strcmp(filename,k->filename))k=k->nextfile;returnk;}voiddisplayfile(UFD*link){UFD*p;p=link;if(!p){printf("\n此目录没有该文件!");return;}printf("\n用户文件如下:\n");while(p){printf("%s\t||",p->filename);printf("%s\t||",p->procode);printf("%d\n\n",p->length);p=p->nextfile;}}voidcreatefile(){charusername[10];charfilename[10];inti;UFD*p1,*p2,*newfile;if(num>=10)/*用户文件目录已满,创建文件失败*/{printf("用户文件目录已满\n创建文件失败!\n");return;}printf("输入用户名:\n");scanf("%s",username);i=findusername(username);/*返回用户名下标*/if(i==num)/*如果该用户不存在,且用户个数不小于10,先创建用户再建立用户文件*/{printf("用户不存在,请建立用户!\n");strcpy(filesystem[num].username,username);/*创建用户目录*/num++;{newfile=(UFD*)malloc(sizeof(UFD));newfile->nextfile=NULL;filesystem[num-1].link=newfile;printf("文件名:");scanf("%s",filesystem[num-1].link->filename);printf("\n属性:");scanf("%s",filesystem[num-1].link->procode);printf("\n长度:");scanf("%d",&(filesystem[num-1].link->length));printf("\n文件已创建!\n");}}else/*为已存在的用户建立文件*/{p1=p2=filesystem[i].link;printf("输入文件名:");scanf("%s",filename);while(p2){if(!strcmp(p2->filename,filename)){printf("文件名已存在,请输入新文件名!\n");scanf("%s",filename);}p1=p2;p2=p2->nextfile;}newfile=(UFD*)malloc(sizeof(UFD));newfile->nextfile=NULL;strcpy(newfile->filename,filename);printf("\n属性:");scanf("%s",newfile->procode);printf("\n长度:");scanf("%d",&(newfile->length));p1->nextfile=newfile;sername);}voiddeletefile()/*删除文件*/{inti;charusername[10];charfilename[10];UFD*p1,*p2;printf("\n输入用户名:\n");scanf("%s",username);i=findusername(username);ink;while(p2&&strcmp(p2->filename,filename)){p1=p2;p2=p2->nextfile;}if(!p2)printf("\n文件不存在!\n删除失败!\n");else{if(p1==p2)filesystem[i].link=p1->nextfile;elsep1->nextfile=p2->nextfile;delete(p2);printf("文件已删除!\n");}}displayallfile();}AFD*openfile(){charusername[10];charfilename[10];inti;UFD*p=NULL;AFD*k=NULL;/*为打开的文件设置了运行文件目录*/printf("输入用户名:\n");scanf("%s",username);i=findusername(username);/*返回用户名下标*/if(i>=num){printf("\n用户不存在!\n不能打开文件!\n");returnNULL;}else/*用户存在*/{printf("\n输入文件名:");scanf("%s",filename);p=findfilename(filename,filesystem[i].link);if(!p)/*用户文件不存在*/{printf("\n文件不存在!\n");returnNULL;}else{afd=(AFD*)malloc(sizeof(AFD));strcpy(afd->filename,p->filename);strcpy(afd->procode,p->procode);afd->rwpointer=0;printf("\n文件已打开!\n");rw_pointer=p;/*为了读文件保留指针*/printf("\t文件目录AFD:\n");/*打开运行文件目录AFD*/printf("\t文件名:%s\n",afd->filename);printf("\t属性:%s\n",afd->procode);printf("\t读写指针:%d\n",afd->rwpointer);}}returnafd;}voidclosefile(){if(!afd){printf("\n没有文件打开!\n");return;}delete(afd);afd=NULL;printf("\n文件已关闭!\n");}voidreadfile()//{AFD*p;p=openfile();if(!p)return;if(strcmp(p->procode,"100")&&strcmp(p->procode,"110"))printf("\nfile:%s文件不可读!\n",p->filename);/*操作*/else{printf("已读取文件!\n");printf("\t文件名:%s\n",p->filename);printf("\t属性:%s\n",p->procode);printf("\t读写指针:%d\n",rand()%rw_pointer->length);}closefile();/*关闭文件*/}voidwritefile(){AFD*p;/*运行文件目录*/UFD*k;p=openfile();k=rw_pointer;if(!p)return;if(strcmp(p->procode,"110")){printf("\nfile:%s该文件不能写!\n",p->filename);return;}else{p->rwpointer=rand()%k->length;k->length=p->rwpointer;/*修改读书指针写回文件*/}printf("\n已完成写操作!\n");printf("\t文件名:%s\n",k->filename);printf("\t属性:%s\n",k->procode);printf("\t长度:%d\n",k->length);closefile();}voidexecutefile(){AFD*p;p=openfile();if(!p){printf("\n文件不存在!\n");return;}if(strcmp(p->procode,"001")){printf("\n该文件不能执行!\n");printf("\n文件属性为不可执行文件!\n");return;}else{closefile();printf("\n文件执行完毕!");}}voidmenu(){printf("------------------------------------------------------------------------------\n");printf("<文件管理>\n");printf("------------------------------------------------------------------------------\n");printf("MENU:\n");printf("\t\tmenu----------显示菜单\n");printf("\t\topen----------打开文件\n");printf("\t\tclose---------关闭文件\n");printf("\t\tcreate--------创建文件\n");printf("\t\tread----------读文件\n");printf("\t\twrite---------写文件\n");printf("\t\texecute-------执行文件\n");printf("\t\tdelete--------删除文件\n");printf("\t\tdisplay--------显示文件列表\n");printf("\t\texit--------退出\n");printf("\t注意:输入时当文件长度为0时表示该用户的文件输入结束!\n");printf("------------------------------------------------------------------------------\n");}voidfileoperation()/*文件基本操作*/{charstr[10];intsort;while(1){printf("输入命令:\n");printf(">>");scanf("%s",str);if(!strcmp(str,"create"))sort=1;elseif(!strcmp(str,"delete"))sort=2;elseif(!strcmp(str,"read"))sort=3;elseif(!strcmp(str,"write"))sort=4;elseif(!strcmp(str,"execute"))sort=5;elseif(!strcmp(str,"open"))sort=6;elseif(!strcmp(str,"close"))sort=7;elseif(!strcmp(str,"menu"))sort=8;elseif(!strcmp(str,"display"))sort=9;elseif(!strcmp(str,"exit"))sort=10;elsesort=0;switch(sort){case1:createfile();break;case2:deletefile();break;case3:readfile();break;case4:writefile();break;case5:executefile();break;case6:openfile();break;case7:closefile();break;case8:menu();break;case9:displayallfile();break;case10:return;default:break;}}}voidmain(){menu();input();fileoperation();}
{
printf("用户:
%s目录如下!
\n",filesystem[i].username);
p=filesystem[i].link;
while(p)
{printf("\t文件名:
%s\t||",p->filename);
printf("文件属性:
%s\t||",p->procode);
printf("文件长度:
%d\n\n",p->length);
p=p->nextfile;
}
voidinput()/*建立用户文件系统*/
{inti,j;
intlength;
charfilename[10];
UFD*p1,*p2,*first;
for(i=0;i<10;i++)
filesystem[i].link=NULL;
printf("用户号码:
\n");
scanf("%d",&num);
for(i=0;i{printf("输入第%d个用户名:\n",i+1);scanf("%s",filesystem[i].username);}for(i=0;i{j=1;printf("第%d个用户的文件如下\n",i+1);printf("文件%d:\n",j);printf("长度:");scanf("%d",&length);if(!length)continue;printf("文件名:");scanf("%s",filename);printf("文件属性(100只读,110读写,001可执行)");scanf("%s",procode);first=(UFD*)malloc(sizeof(UFD));first->nextfile=NULL;strcpy(first->filename,filename);strcpy(first->procode,procode);first->length=length;p1=p2=first;j++;while(1){printf("文件%d:\n",j);printf("长度:");scanf("%d",&length);if(!length)break;printf("文件名:");scanf("%s",filename);printf("属性(100只读,110读写,001可执行):");scanf("%s",procode);p2=(UFD*)malloc(sizeof(UFD));p2->nextfile=NULL;strcpy(p2->filename,filename);strcpy(p2->procode,procode);p2->length=length;j++;p1->nextfile=p2;p1=p1->nextfile;}filesystem[i].link=first;}displayallfile();}intfindusername(char*username)/*返回用户名下标,当I=NUM时,用户不存在*/{inti;i=0;while(i{if(!strcmp(filesystem[i].username,username))break;i++;}returni;}UFD*findfilename(char*filename,UFD*filepointer){UFD*k;k=filepointer;while(k&&strcmp(filename,k->filename))k=k->nextfile;returnk;}voiddisplayfile(UFD*link){UFD*p;p=link;if(!p){printf("\n此目录没有该文件!");return;}printf("\n用户文件如下:\n");while(p){printf("%s\t||",p->filename);printf("%s\t||",p->procode);printf("%d\n\n",p->length);p=p->nextfile;}}voidcreatefile(){charusername[10];charfilename[10];inti;UFD*p1,*p2,*newfile;if(num>=10)/*用户文件目录已满,创建文件失败*/{printf("用户文件目录已满\n创建文件失败!\n");return;}printf("输入用户名:\n");scanf("%s",username);i=findusername(username);/*返回用户名下标*/if(i==num)/*如果该用户不存在,且用户个数不小于10,先创建用户再建立用户文件*/{printf("用户不存在,请建立用户!\n");strcpy(filesystem[num].username,username);/*创建用户目录*/num++;{newfile=(UFD*)malloc(sizeof(UFD));newfile->nextfile=NULL;filesystem[num-1].link=newfile;printf("文件名:");scanf("%s",filesystem[num-1].link->filename);printf("\n属性:");scanf("%s",filesystem[num-1].link->procode);printf("\n长度:");scanf("%d",&(filesystem[num-1].link->length));printf("\n文件已创建!\n");}}else/*为已存在的用户建立文件*/{p1=p2=filesystem[i].link;printf("输入文件名:");scanf("%s",filename);while(p2){if(!strcmp(p2->filename,filename)){printf("文件名已存在,请输入新文件名!\n");scanf("%s",filename);}p1=p2;p2=p2->nextfile;}newfile=(UFD*)malloc(sizeof(UFD));newfile->nextfile=NULL;strcpy(newfile->filename,filename);printf("\n属性:");scanf("%s",newfile->procode);printf("\n长度:");scanf("%d",&(newfile->length));p1->nextfile=newfile;sername);}voiddeletefile()/*删除文件*/{inti;charusername[10];charfilename[10];UFD*p1,*p2;printf("\n输入用户名:\n");scanf("%s",username);i=findusername(username);ink;while(p2&&strcmp(p2->filename,filename)){p1=p2;p2=p2->nextfile;}if(!p2)printf("\n文件不存在!\n删除失败!\n");else{if(p1==p2)filesystem[i].link=p1->nextfile;elsep1->nextfile=p2->nextfile;delete(p2);printf("文件已删除!\n");}}displayallfile();}AFD*openfile(){charusername[10];charfilename[10];inti;UFD*p=NULL;AFD*k=NULL;/*为打开的文件设置了运行文件目录*/printf("输入用户名:\n");scanf("%s",username);i=findusername(username);/*返回用户名下标*/if(i>=num){printf("\n用户不存在!\n不能打开文件!\n");returnNULL;}else/*用户存在*/{printf("\n输入文件名:");scanf("%s",filename);p=findfilename(filename,filesystem[i].link);if(!p)/*用户文件不存在*/{printf("\n文件不存在!\n");returnNULL;}else{afd=(AFD*)malloc(sizeof(AFD));strcpy(afd->filename,p->filename);strcpy(afd->procode,p->procode);afd->rwpointer=0;printf("\n文件已打开!\n");rw_pointer=p;/*为了读文件保留指针*/printf("\t文件目录AFD:\n");/*打开运行文件目录AFD*/printf("\t文件名:%s\n",afd->filename);printf("\t属性:%s\n",afd->procode);printf("\t读写指针:%d\n",afd->rwpointer);}}returnafd;}voidclosefile(){if(!afd){printf("\n没有文件打开!\n");return;}delete(afd);afd=NULL;printf("\n文件已关闭!\n");}voidreadfile()//{AFD*p;p=openfile();if(!p)return;if(strcmp(p->procode,"100")&&strcmp(p->procode,"110"))printf("\nfile:%s文件不可读!\n",p->filename);/*操作*/else{printf("已读取文件!\n");printf("\t文件名:%s\n",p->filename);printf("\t属性:%s\n",p->procode);printf("\t读写指针:%d\n",rand()%rw_pointer->length);}closefile();/*关闭文件*/}voidwritefile(){AFD*p;/*运行文件目录*/UFD*k;p=openfile();k=rw_pointer;if(!p)return;if(strcmp(p->procode,"110")){printf("\nfile:%s该文件不能写!\n",p->filename);return;}else{p->rwpointer=rand()%k->length;k->length=p->rwpointer;/*修改读书指针写回文件*/}printf("\n已完成写操作!\n");printf("\t文件名:%s\n",k->filename);printf("\t属性:%s\n",k->procode);printf("\t长度:%d\n",k->length);closefile();}voidexecutefile(){AFD*p;p=openfile();if(!p){printf("\n文件不存在!\n");return;}if(strcmp(p->procode,"001")){printf("\n该文件不能执行!\n");printf("\n文件属性为不可执行文件!\n");return;}else{closefile();printf("\n文件执行完毕!");}}voidmenu(){printf("------------------------------------------------------------------------------\n");printf("<文件管理>\n");printf("------------------------------------------------------------------------------\n");printf("MENU:\n");printf("\t\tmenu----------显示菜单\n");printf("\t\topen----------打开文件\n");printf("\t\tclose---------关闭文件\n");printf("\t\tcreate--------创建文件\n");printf("\t\tread----------读文件\n");printf("\t\twrite---------写文件\n");printf("\t\texecute-------执行文件\n");printf("\t\tdelete--------删除文件\n");printf("\t\tdisplay--------显示文件列表\n");printf("\t\texit--------退出\n");printf("\t注意:输入时当文件长度为0时表示该用户的文件输入结束!\n");printf("------------------------------------------------------------------------------\n");}voidfileoperation()/*文件基本操作*/{charstr[10];intsort;while(1){printf("输入命令:\n");printf(">>");scanf("%s",str);if(!strcmp(str,"create"))sort=1;elseif(!strcmp(str,"delete"))sort=2;elseif(!strcmp(str,"read"))sort=3;elseif(!strcmp(str,"write"))sort=4;elseif(!strcmp(str,"execute"))sort=5;elseif(!strcmp(str,"open"))sort=6;elseif(!strcmp(str,"close"))sort=7;elseif(!strcmp(str,"menu"))sort=8;elseif(!strcmp(str,"display"))sort=9;elseif(!strcmp(str,"exit"))sort=10;elsesort=0;switch(sort){case1:createfile();break;case2:deletefile();break;case3:readfile();break;case4:writefile();break;case5:executefile();break;case6:openfile();break;case7:closefile();break;case8:menu();break;case9:displayallfile();break;case10:return;default:break;}}}voidmain(){menu();input();fileoperation();}
printf("输入第%d个用户名:
\n",i+1);
scanf("%s",filesystem[i].username);}
for(i=0;i{j=1;printf("第%d个用户的文件如下\n",i+1);printf("文件%d:\n",j);printf("长度:");scanf("%d",&length);if(!length)continue;printf("文件名:");scanf("%s",filename);printf("文件属性(100只读,110读写,001可执行)");scanf("%s",procode);first=(UFD*)malloc(sizeof(UFD));first->nextfile=NULL;strcpy(first->filename,filename);strcpy(first->procode,procode);first->length=length;p1=p2=first;j++;while(1){printf("文件%d:\n",j);printf("长度:");scanf("%d",&length);if(!length)break;printf("文件名:");scanf("%s",filename);printf("属性(100只读,110读写,001可执行):");scanf("%s",procode);p2=(UFD*)malloc(sizeof(UFD));p2->nextfile=NULL;strcpy(p2->filename,filename);strcpy(p2->procode,procode);p2->length=length;j++;p1->nextfile=p2;p1=p1->nextfile;}filesystem[i].link=first;}displayallfile();}intfindusername(char*username)/*返回用户名下标,当I=NUM时,用户不存在*/{inti;i=0;while(i{if(!strcmp(filesystem[i].username,username))break;i++;}returni;}UFD*findfilename(char*filename,UFD*filepointer){UFD*k;k=filepointer;while(k&&strcmp(filename,k->filename))k=k->nextfile;returnk;}voiddisplayfile(UFD*link){UFD*p;p=link;if(!p){printf("\n此目录没有该文件!");return;}printf("\n用户文件如下:\n");while(p){printf("%s\t||",p->filename);printf("%s\t||",p->procode);printf("%d\n\n",p->length);p=p->nextfile;}}voidcreatefile(){charusername[10];charfilename[10];inti;UFD*p1,*p2,*newfile;if(num>=10)/*用户文件目录已满,创建文件失败*/{printf("用户文件目录已满\n创建文件失败!\n");return;}printf("输入用户名:\n");scanf("%s",username);i=findusername(username);/*返回用户名下标*/if(i==num)/*如果该用户不存在,且用户个数不小于10,先创建用户再建立用户文件*/{printf("用户不存在,请建立用户!\n");strcpy(filesystem[num].username,username);/*创建用户目录*/num++;{newfile=(UFD*)malloc(sizeof(UFD));newfile->nextfile=NULL;filesystem[num-1].link=newfile;printf("文件名:");scanf("%s",filesystem[num-1].link->filename);printf("\n属性:");scanf("%s",filesystem[num-1].link->procode);printf("\n长度:");scanf("%d",&(filesystem[num-1].link->length));printf("\n文件已创建!\n");}}else/*为已存在的用户建立文件*/{p1=p2=filesystem[i].link;printf("输入文件名:");scanf("%s",filename);while(p2){if(!strcmp(p2->filename,filename)){printf("文件名已存在,请输入新文件名!\n");scanf("%s",filename);}p1=p2;p2=p2->nextfile;}newfile=(UFD*)malloc(sizeof(UFD));newfile->nextfile=NULL;strcpy(newfile->filename,filename);printf("\n属性:");scanf("%s",newfile->procode);printf("\n长度:");scanf("%d",&(newfile->length));p1->nextfile=newfile;sername);}voiddeletefile()/*删除文件*/{inti;charusername[10];charfilename[10];UFD*p1,*p2;printf("\n输入用户名:\n");scanf("%s",username);i=findusername(username);ink;while(p2&&strcmp(p2->filename,filename)){p1=p2;p2=p2->nextfile;}if(!p2)printf("\n文件不存在!\n删除失败!\n");else{if(p1==p2)filesystem[i].link=p1->nextfile;elsep1->nextfile=p2->nextfile;delete(p2);printf("文件已删除!\n");}}displayallfile();}AFD*openfile(){charusername[10];charfilename[10];inti;UFD*p=NULL;AFD*k=NULL;/*为打开的文件设置了运行文件目录*/printf("输入用户名:\n");scanf("%s",username);i=findusername(username);/*返回用户名下标*/if(i>=num){printf("\n用户不存在!\n不能打开文件!\n");returnNULL;}else/*用户存在*/{printf("\n输入文件名:");scanf("%s",filename);p=findfilename(filename,filesystem[i].link);if(!p)/*用户文件不存在*/{printf("\n文件不存在!\n");returnNULL;}else{afd=(AFD*)malloc(sizeof(AFD));strcpy(afd->filename,p->filename);strcpy(afd->procode,p->procode);afd->rwpointer=0;printf("\n文件已打开!\n");rw_pointer=p;/*为了读文件保留指针*/printf("\t文件目录AFD:\n");/*打开运行文件目录AFD*/printf("\t文件名:%s\n",afd->filename);printf("\t属性:%s\n",afd->procode);printf("\t读写指针:%d\n",afd->rwpointer);}}returnafd;}voidclosefile(){if(!afd){printf("\n没有文件打开!\n");return;}delete(afd);afd=NULL;printf("\n文件已关闭!\n");}voidreadfile()//{AFD*p;p=openfile();if(!p)return;if(strcmp(p->procode,"100")&&strcmp(p->procode,"110"))printf("\nfile:%s文件不可读!\n",p->filename);/*操作*/else{printf("已读取文件!\n");printf("\t文件名:%s\n",p->filename);printf("\t属性:%s\n",p->procode);printf("\t读写指针:%d\n",rand()%rw_pointer->length);}closefile();/*关闭文件*/}voidwritefile(){AFD*p;/*运行文件目录*/UFD*k;p=openfile();k=rw_pointer;if(!p)return;if(strcmp(p->procode,"110")){printf("\nfile:%s该文件不能写!\n",p->filename);return;}else{p->rwpointer=rand()%k->length;k->length=p->rwpointer;/*修改读书指针写回文件*/}printf("\n已完成写操作!\n");printf("\t文件名:%s\n",k->filename);printf("\t属性:%s\n",k->procode);printf("\t长度:%d\n",k->length);closefile();}voidexecutefile(){AFD*p;p=openfile();if(!p){printf("\n文件不存在!\n");return;}if(strcmp(p->procode,"001")){printf("\n该文件不能执行!\n");printf("\n文件属性为不可执行文件!\n");return;}else{closefile();printf("\n文件执行完毕!");}}voidmenu(){printf("------------------------------------------------------------------------------\n");printf("<文件管理>\n");printf("------------------------------------------------------------------------------\n");printf("MENU:\n");printf("\t\tmenu----------显示菜单\n");printf("\t\topen----------打开文件\n");printf("\t\tclose---------关闭文件\n");printf("\t\tcreate--------创建文件\n");printf("\t\tread----------读文件\n");printf("\t\twrite---------写文件\n");printf("\t\texecute-------执行文件\n");printf("\t\tdelete--------删除文件\n");printf("\t\tdisplay--------显示文件列表\n");printf("\t\texit--------退出\n");printf("\t注意:输入时当文件长度为0时表示该用户的文件输入结束!\n");printf("------------------------------------------------------------------------------\n");}voidfileoperation()/*文件基本操作*/{charstr[10];intsort;while(1){printf("输入命令:\n");printf(">>");scanf("%s",str);if(!strcmp(str,"create"))sort=1;elseif(!strcmp(str,"delete"))sort=2;elseif(!strcmp(str,"read"))sort=3;elseif(!strcmp(str,"write"))sort=4;elseif(!strcmp(str,"execute"))sort=5;elseif(!strcmp(str,"open"))sort=6;elseif(!strcmp(str,"close"))sort=7;elseif(!strcmp(str,"menu"))sort=8;elseif(!strcmp(str,"display"))sort=9;elseif(!strcmp(str,"exit"))sort=10;elsesort=0;switch(sort){case1:createfile();break;case2:deletefile();break;case3:readfile();break;case4:writefile();break;case5:executefile();break;case6:openfile();break;case7:closefile();break;case8:menu();break;case9:displayallfile();break;case10:return;default:break;}}}voidmain(){menu();input();fileoperation();}
j=1;
printf("第%d个用户的文件如下\n",i+1);
printf("文件%d:
\n",j);
printf("长度:
");
scanf("%d",&length);
if(!
length)
continue;
printf("文件名:
scanf("%s",filename);
printf("文件属性(100只读,110读写,001可执行)");
scanf("%s",procode);
first=(UFD*)malloc(sizeof(UFD));
first->nextfile=NULL;
strcpy(first->filename,filename);
strcpy(first->procode,procode);
first->length=length;
p1=p2=first;
j++;
while
(1)
{printf("文件%d:
break;
printf("属性(100只读,110读写,001可执行):
p2=(UFD*)malloc(sizeof(UFD));
p2->nextfile=NULL;
strcpy(p2->filename,filename);
strcpy(p2->procode,procode);
p2->length=length;
p1->nextfile=p2;
p1=p1->nextfile;}
filesystem[i].link=first;}
displayallfile();
intfindusername(char*username)/*返回用户名下标,当I=NUM时,用户不存在*/
i=0;
while(i{if(!strcmp(filesystem[i].username,username))break;i++;}returni;}UFD*findfilename(char*filename,UFD*filepointer){UFD*k;k=filepointer;while(k&&strcmp(filename,k->filename))k=k->nextfile;returnk;}voiddisplayfile(UFD*link){UFD*p;p=link;if(!p){printf("\n此目录没有该文件!");return;}printf("\n用户文件如下:\n");while(p){printf("%s\t||",p->filename);printf("%s\t||",p->procode);printf("%d\n\n",p->length);p=p->nextfile;}}voidcreatefile(){charusername[10];charfilename[10];inti;UFD*p1,*p2,*newfile;if(num>=10)/*用户文件目录已满,创建文件失败*/{printf("用户文件目录已满\n创建文件失败!\n");return;}printf("输入用户名:\n");scanf("%s",username);i=findusername(username);/*返回用户名下标*/if(i==num)/*如果该用户不存在,且用户个数不小于10,先创建用户再建立用户文件*/{printf("用户不存在,请建立用户!\n");strcpy(filesystem[num].username,username);/*创建用户目录*/num++;{newfile=(UFD*)malloc(sizeof(UFD));newfile->nextfile=NULL;filesystem[num-1].link=newfile;printf("文件名:");scanf("%s",filesystem[num-1].link->filename);printf("\n属性:");scanf("%s",filesystem[num-1].link->procode);printf("\n长度:");scanf("%d",&(filesystem[num-1].link->length));printf("\n文件已创建!\n");}}else/*为已存在的用户建立文件*/{p1=p2=filesystem[i].link;printf("输入文件名:");scanf("%s",filename);while(p2){if(!strcmp(p2->filename,filename)){printf("文件名已存在,请输入新文件名!\n");scanf("%s",filename);}p1=p2;p2=p2->nextfile;}newfile=(UFD*)malloc(sizeof(UFD));newfile->nextfile=NULL;strcpy(newfile->filename,filename);printf("\n属性:");scanf("%s",newfile->procode);printf("\n长度:");scanf("%d",&(newfile->length));p1->nextfile=newfile;sername);}voiddeletefile()/*删除文件*/{inti;charusername[10];charfilename[10];UFD*p1,*p2;printf("\n输入用户名:\n");scanf("%s",username);i=findusername(username);ink;while(p2&&strcmp(p2->filename,filename)){p1=p2;p2=p2->nextfile;}if(!p2)printf("\n文件不存在!\n删除失败!\n");else{if(p1==p2)filesystem[i].link=p1->nextfile;elsep1->nextfile=p2->nextfile;delete(p2);printf("文件已删除!\n");}}displayallfile();}AFD*openfile(){charusername[10];charfilename[10];inti;UFD*p=NULL;AFD*k=NULL;/*为打开的文件设置了运行文件目录*/printf("输入用户名:\n");scanf("%s",username);i=findusername(username);/*返回用户名下标*/if(i>=num){printf("\n用户不存在!\n不能打开文件!\n");returnNULL;}else/*用户存在*/{printf("\n输入文件名:");scanf("%s",filename);p=findfilename(filename,filesystem[i].link);if(!p)/*用户文件不存在*/{printf("\n文件不存在!\n");returnNULL;}else{afd=(AFD*)malloc(sizeof(AFD));strcpy(afd->filename,p->filename);strcpy(afd->procode,p->procode);afd->rwpointer=0;printf("\n文件已打开!\n");rw_pointer=p;/*为了读文件保留指针*/printf("\t文件目录AFD:\n");/*打开运行文件目录AFD*/printf("\t文件名:%s\n",afd->filename);printf("\t属性:%s\n",afd->procode);printf("\t读写指针:%d\n",afd->rwpointer);}}returnafd;}voidclosefile(){if(!afd){printf("\n没有文件打开!\n");return;}delete(afd);afd=NULL;printf("\n文件已关闭!\n");}voidreadfile()//{AFD*p;p=openfile();if(!p)return;if(strcmp(p->procode,"100")&&strcmp(p->procode,"110"))printf("\nfile:%s文件不可读!\n",p->filename);/*操作*/else{printf("已读取文件!\n");printf("\t文件名:%s\n",p->filename);printf("\t属性:%s\n",p->procode);printf("\t读写指针:%d\n",rand()%rw_pointer->length);}closefile();/*关闭文件*/}voidwritefile(){AFD*p;/*运行文件目录*/UFD*k;p=openfile();k=rw_pointer;if(!p)return;if(strcmp(p->procode,"110")){printf("\nfile:%s该文件不能写!\n",p->filename);return;}else{p->rwpointer=rand()%k->length;k->length=p->rwpointer;/*修改读书指针写回文件*/}printf("\n已完成写操作!\n");printf("\t文件名:%s\n",k->filename);printf("\t属性:%s\n",k->procode);printf("\t长度:%d\n",k->length);closefile();}voidexecutefile(){AFD*p;p=openfile();if(!p){printf("\n文件不存在!\n");return;}if(strcmp(p->procode,"001")){printf("\n该文件不能执行!\n");printf("\n文件属性为不可执行文件!\n");return;}else{closefile();printf("\n文件执行完毕!");}}voidmenu(){printf("------------------------------------------------------------------------------\n");printf("<文件管理>\n");printf("------------------------------------------------------------------------------\n");printf("MENU:\n");printf("\t\tmenu----------显示菜单\n");printf("\t\topen----------打开文件\n");printf("\t\tclose---------关闭文件\n");printf("\t\tcreate--------创建文件\n");printf("\t\tread----------读文件\n");printf("\t\twrite---------写文件\n");printf("\t\texecute-------执行文件\n");printf("\t\tdelete--------删除文件\n");printf("\t\tdisplay--------显示文件列表\n");printf("\t\texit--------退出\n");printf("\t注意:输入时当文件长度为0时表示该用户的文件输入结束!\n");printf("------------------------------------------------------------------------------\n");}voidfileoperation()/*文件基本操作*/{charstr[10];intsort;while(1){printf("输入命令:\n");printf(">>");scanf("%s",str);if(!strcmp(str,"create"))sort=1;elseif(!strcmp(str,"delete"))sort=2;elseif(!strcmp(str,"read"))sort=3;elseif(!strcmp(str,"write"))sort=4;elseif(!strcmp(str,"execute"))sort=5;elseif(!strcmp(str,"open"))sort=6;elseif(!strcmp(str,"close"))sort=7;elseif(!strcmp(str,"menu"))sort=8;elseif(!strcmp(str,"display"))sort=9;elseif(!strcmp(str,"exit"))sort=10;elsesort=0;switch(sort){case1:createfile();break;case2:deletefile();break;case3:readfile();break;case4:writefile();break;case5:executefile();break;case6:openfile();break;case7:closefile();break;case8:menu();break;case9:displayallfile();break;case10:return;default:break;}}}voidmain(){menu();input();fileoperation();}
{if(!
strcmp(filesystem[i].username,username))
i++;}
returni;
UFD*findfilename(char*filename,UFD*filepointer)
{UFD*k;
k=filepointer;
while(k&&strcmp(filename,k->filename))
k=k->nextfile;
returnk;}
voiddisplayfile(UFD*link)
{UFD*p;
p=link;
p)
{printf("\n此目录没有该文件!
return;}
printf("\n用户文件如下:
{printf("%s\t||",p->filename);
printf("%s\t||",p->procode);
printf("%d\n\n",p->length);
p=p->nextfile;}
voidcreatefile()
{charusername[10];
inti;
UFD*p1,*p2,*newfile;
if(num>=10)/*用户文件目录已满,创建文件失败*/
printf("用户文件目录已满\n创建文件失败!
printf("输入用户名:
scanf("%s",username);
i=findusername(username);/*返回用户名下标*/
if(i==num)/*如果该用户不存在,且用户个数不小于10,先创建用户再建立用户文件*/
{printf("用户不存在,请建立用户!
strcpy(filesystem[num].username,username);/*创建用户目录*/
num++;
{newfile=(UFD*)malloc(sizeof(UFD));
newfile->nextfile=NULL;
filesystem[num-1].link=newfile;
scanf("%s",filesystem[num-1].link->filename);
printf("\n属性:
scanf("%s",filesystem[num-1].link->procode);
printf("\n长度:
scanf("%d",&(filesystem[num-1].link->length));
printf("\n文件已创建!
\n");}
else/*为已存在的用户建立文件*/
{p1=p2=filesystem[i].link;
printf("输入文件名:
while(p2)
strcmp(p2->filename,filename))
{printf("文件名已存在,请输入新文件名!
scanf("%s",filename);}
p1=p2;
p2=p2->nextfile;
newfile=(UFD*)malloc(sizeof(UFD));
strcpy(newfile->filename,filename);
scanf("%s",newfile->procode);
scanf("%d",&(newfile->length));
p1->nextfile=newfile;sername);}
voiddeletefile()/*删除文件*/
charusername[10];
UFD*p1,*p2;
printf("\n输入用户名:
i=findusername(username);ink;
while(p2&&strcmp(p2->filename,filename))
{p1=p2;
p2=p2->nextfile;}
p2)
printf("\n文件不存在!
\n删除失败!
else
{if(p1==p2)
filesystem[i].link=p1->nextfile;
p1->nextfile=p2->nextfile;
delete(p2);
printf("文件已删除!
displayallfile();}
AFD*openfile()
UFD*p=NULL;
AFD*k=NULL;/*为打开的文件设置了运行文件目录*/
if(i>=num)
{printf("\n用户不存在!
\n不能打开文件!
returnNULL;}
else/*用户存在*/
{printf("\n输入文件名:
p=findfilename(filename,filesystem[i].link);
p)/*用户文件不存在*/
{printf("\n文件不存在!
else{afd=(AFD*)malloc(sizeof(AFD));
strcpy(afd->filename,p->filename);
strcpy(afd->procode,p->procode);
afd->rwpointer=0;
printf("\n文件已打开!
rw_pointer=p;/*为了读文件保留指针*/
printf("\t文件目录AFD:
\n");/*打开运行文件目录AFD*/
printf("\t文件名:
%s\n",afd->filename);
printf("\t属性:
%s\n",afd->procode);
printf("\t读写指针:
%d\n",afd->rwpointer);}
returnafd;}
voidclosefile()
afd)
{printf("\n没有文件打开!
delete(afd);
afd=NULL;
printf("\n文件已关闭!
voidreadfile()//
{AFD*p;
p=openfile();
return;
if(strcmp(p->procode,"100")&&strcmp(p->procode,"110"))
printf("\nfile:
%s文件不可读!
\n",p->filename);/*操作*/
{printf("已读取文件!
%s\n",p->filename);
%s\n",p->procode);
%d\n",rand()%rw_pointer->length);}
closefile();/*关闭文件*/
voidwritefile()
{AFD*p;/*运行文件目录*/
UFD*k;
k=rw_pointer;
if(strcmp(p->procode,"110"))
{printf("\nfile:
%s该文件不能写!
\n",p->filename);
{p->rwpointer=rand()%k->length;
k->length=p->rwpointer;/*修改读书指针写回文件*/
printf("\n已完成写操作!
%s\n",k->filename);
%s\n",k->procode);
printf("\t长度:
%d\n",k->length);
closefile();
voidexecutefile()
if(strcmp(p->procode,"001"))
{printf("\n该文件不能执行!
printf("\n文件属性为不可执行文件!
else{
printf("\n文件执行完毕!
");}
voidmenu()
{printf("------------------------------------------------------------------------------\n");
printf("<文件管理>\n");
printf("------------------------------------------------------------------------------\n");
printf("MENU:
printf("\t\tmenu----------显示菜单\n");
printf("\t\topen----------打开文件\n");
printf("\t\tclose---------关闭文件\n");
printf("\t\tcreate--------创建文件\n");
printf("\t\tread----------读文件\n");
printf("\t\twrite---------写文件\n");
printf("\t\texecute-------执行文件\n");
printf("\t\tdelete--------删除文件\n");
printf("\t\tdisplay--------显示文件列表\n");
printf("\t\texit--------退出\n");
printf("\t注意:
输入时当文件长度为0时表示该用户的文件输入结束!
voidfileoperation()/*文件基本操作*/
{charstr[10];
intsort;
{printf("输入命令:
printf(">>");
scanf("%s",str);
strcmp(str,"create"))sort=1;
strcmp(str,"delete"))sort=2;
strcmp(str,"read"))sort=3;
strcmp(str,"write"))sort=4;
strcmp(str,"execute"))sort=5;
strcmp(str,"open"))sort=6;
strcmp(str,"close"))sort=7;
strcmp(str,"menu"))sort=8;
strcmp(str,"display"))sort=9;
strcmp(str,"exit"))sort=10;
sort=0;
switch(sort)
{case1:
createfile();break;
case2:
deletefile();break;
case3:
readfile();break;
case4:
writefile();break;
case5:
executefile();break;
case6:
openfile();break;
case7:
closefile();break;
case8:
menu();break;
case9:
displayallfile();break;
case10:
default:
break;}
voidmain()
{menu();
input();
fileoperation();
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