#include#include#include#defineMEM_D_SIZE1024*1024//总磁盘空间为1M#defineDISKSIZE1024//磁盘块的大小1K#defineDISK_NUM1024//磁盘块数目1K#defineFATSIZEDISK_NUM*sizeof(structfatitem)//FAT表大小#defineROOT_DISK_NOFATSIZE/DISKSIZE+1//根目录起始盘块号#defineROOT_DISK_SIZEsizeof(structdirect)//根目录大小#defineDIR_MAXSIZE1024//路径最大长度为1KB#defineMSD5//最大子目录数5#defineMOFN5//最大文件深度为5#defineMAX_WRITE1024*128//最大写入文字长度128KBstructfatitem/*size8*/{intitem;/*存放文件下一个磁盘的指针*/charem_disk;/*磁盘块是否空闲标志位0空闲*/};structdirect{/*-----文件控制快信息-----*/structFCB{charname[9];/*文件/目录名8位*/charproperty;/*属性1位目录0位普通文件*/intsize;/*文件/目录字节数、盘块数)*/intfirstdisk;/*文件/目录起始盘块号*/intnext;/*子目录起始盘块号*/intsign;/*1是根目录0不是根目录*/}directitem[MSD+2];};structopentable{structopenttableitem{charname[9];/*文件名*/intfirstdisk;/*起始盘块号*/intsize;/*文件的大小*/}openitem[MOFN];intcur_size;/*当前打文件的数目*/};structfatitem*fat;/*FAT表*/structdirect*root;/*根目录*/structdirect*cur_dir;/*当前目录*/structopentableu_opentable;/*文件打开表*/intfd=-1;/*文件打开表的序号*/char*bufferdir;/*记录当前路径的名称*/char*fdisk;/*虚拟磁盘起始地址*/voidinitfile();voidformat();voidenter();voidhalt();intcreate(char*name);intopen(char*name);intclose(char*name);intwrite(intfd,char*buf,intlen);intread(intfd,char*buf);intdel(char*name);intmkdir(char*name);intrmdir(char*name);voiddir();intcd(char*name);voidprint();voidshow();voidinitfile(){fdisk=(char*)malloc(MEM_D_SIZE*sizeof(char));/*申请1M空间*/format();}voidformat(){inti;FILE*fp;fat=(structfatitem*)(fdisk+DISKSIZE);/*计算FAT表地址，引导区向后偏移1k)*//*-----初始化FAT表------------*/fat[0].item=-1;/*引导块*/fat[0].em_disk='1';for(i=1;idirectitem[0].sign=1;root->directitem[0].firstdisk=ROOT_DISK_NO;strcpy(root->directitem[0].name,".");root->directitem[0].next=root->directitem[0].firstdisk;root->directitem[0].property='1';root->directitem[0].size=ROOT_DISK_SIZE;/*-------指向上一级目录的目录项---------*/root->directitem[1].sign=1;root->directitem[1].firstdisk=ROOT_DISK_NO;strcpy(root->directitem[1].name,"..");root->directitem[1].next=root->directitem[0].firstdisk;root->directitem[1].property='1';root->directitem[1].size=ROOT_DISK_SIZE;if((fp=fopen("disk.dat","wb"))==NULL){printf("Error:\nCannotopenfile\n");return;}for(i=2;idirectitem[i].sign=0;root->directitem[i].firstdisk=-1;strcpy(root->directitem[i].name,"");root->directitem[i].next=-1;root->directitem[i].property='0';root->directitem[i].size=0;}if((fp=fopen("disk.dat","wb"))==NULL){printf("Error:\nCannotopenfile\n");return;}if(fwrite(fdisk,MEM_D_SIZE,1,fp)!=1)/*把虚拟磁盘空间保存到磁盘文件中*/{printf("Error:\nFilewriteerror!\n");}fclose(fp);}voidenter(){FILE*fp;inti;fdisk=(char*)malloc(MEM_D_SIZE*sizeof(char));/*申请1M空间*/if((fp=fopen("disk.dat","rb"))==NULL){printf("Error:...
