l参考_文件系统_操作系统模拟_cmd模拟_

// os_test.cpp : 定义控制台应用程序的入口点。 // //#include "stdafx.h" #include<iostream> #include<stdio.h> #include<string.h> #include<stdlib.h> #include<conio.h> using namespace std; /*宏定义*/ #define MEM_D_SIZE 1024*1024 //总磁盘空间为M #define lihaoSIZE 1024 //磁盘块的大小K #define lihao_NUM 1024 //磁盘块数目K #define FATSIZE lihao_NUM*sizeof(struct fatitem) //FAT表大小 #define ROOT_lihao_NO FATSIZE/lihaoSIZE+1 //根目录起始盘块号 #define ROOT_lihao_SIZE sizeof(struct direct) //根目录大小 #define DIR_MAXSIZE 1024 //路径最大长度为KB #define MSD 8 //最大子目录数 #define MOFN 8 //最大文件深度为 #define MAX_WRITE 1024*128 //最大写入文字长度KB /*数据结构*/ struct fatitem//size 8 { int item;//存放文件下一个磁盘的指针 char em_lihao;//磁盘块是否空闲标志位0 空闲 }; struct direct//目录结构体 { /*文件控制快信息*/ struct FCB { char name[9];//文件/目录名8位 char property;//属性1位目录0位普通文件 int size; //文件/目录字节数、盘块数) int firstlihao;//文件/目录起始盘块号 int next;//子目录起始盘块号 int sign;//1是根目录0不是根目录 }directitem[MSD+2]; }; struct opentable//文件打开表 { struct openttableitem { char name[9];//文件名 int firstlihao;//起始盘块号 int size;//文件的大小 }openitem[MOFN]; int cur_size;//当前打文件的数目 }; struct fatitem *fat;//FAT表* struct direct *root;//根目录 struct direct *cur_dir;//当前目录 struct opentable u_opentable;//文件打开表 int fd=-1; /*文件打开表的序号*/ char *bufferdir; /*记录当前路径的名称*/ char *flihao; /*虚拟磁盘起始地址*/ /*函数声明*/ void initfile();//初始化函数，申请1M空间 void format();//格式化函数 void enter(); void halt(); int create(char *name);//创建文件函数 int open(char *name);//打开文件函数 int close(char *name);//关闭文件函数 int write(char *name,int fd,char *buf,int len);//写文件函数 int read(int fd,char *buf);//读文件函数 int del(char *name);//删除文件函数 int mkdir(char *name);//创建目录函数 int rmdir(char *name);//删除目录函数 void dir();//显示当前目录下的子目录和所有文件的函数 int cd(char *name);//转换目录函数 int rename(char *name, int fd);//重命名文件函数 int copy(char *name, int fd);//复制文件函数 int move(char *name, int fd);//移动文件函数 void command();//命令函数 int inter(); void initfile() { flihao = (char *)malloc(MEM_D_SIZE*sizeof(char)); format(); } void format() { int i; FILE *fp; fat = (struct fatitem *)(flihao+lihaoSIZE); //初始化FAT表 fat[0].item=-1; fat[0].em_lihao='1'; for(i=1;i<ROOT_lihao_NO-1;i++) { fat[i].item=i+1; fat[i].em_lihao='1'; } fat[ROOT_lihao_NO].item=-1; fat[ROOT_lihao_NO].em_lihao='1'; for(i=ROOT_lihao_NO+1;i<lihao_NUM;i++) { fat[i].item = -1; fat[i].em_lihao = '0'; } root = (struct direct *)(flihao+lihaoSIZE+FATSIZE); //初始化目录 root->directitem[0].sign = 1; root->directitem[0].firstlihao = ROOT_lihao_NO; strcpy(root->directitem[0].name,"."); root->directitem[0].next = root->directitem[0].firstlihao; root->directitem[0].property = '1'; root->directitem[0].size = ROOT_lihao_SIZE; //指向上一级目录的目录项 root->directitem[1].sign = 1; root->directitem[1].firstlihao = ROOT_lihao_NO; strcpy(root->directitem[1].name,".."); root->directitem[1].next = root->directitem[0].firstlihao; root->directitem[1].property = '1'; root->directitem[1].size = ROOT_lihao_SIZE; if((fp = fopen("lihao.dat","wb"))==NULL) { printf("Error:\n Cannot open file \n"); return; } for(i=2;i<MSD+2;i++) { root->directitem[i].sign = 0; root->directitem[i].firstlihao = -1; strcpy(root->directitem[i].name,""); root->directitem[i].next = -1; root->directitem[i].property = '0'; root->directitem[i].size = 0; } if((fp = fopen("lihao.dat","wb"))==NULL) { printf("Error:\n Cannot open file \n"); return; } if(fwrite(flihao,MEM_D_SIZE,1,fp)!=1) { printf("Error:\n File write error! \n"); } fclose(fp); } void enter() { FILE *fp; int i; flihao = (char *)malloc(MEM_D_SIZE*sizeof(char)); if((fp=fopen("lihao.dat","rb"))==NULL) { printf("Cannot open file\n"); return; } if(!fread(flihao,MEM_D_SIZE,1,fp)) { printf("Cannot read file\n"); exit(0); } fat = (struct fatitem *)(flihao+lihaoSIZE); root = (struct direct *)(flihao+lihaoSIZE+FATSIZE); fclose(fp); //初始化用户打开表 for(i=0;i<MOFN;i++) { strcpy(u_opentable.openitem[i].name,""); u_opentable.openitem[i].firstlihao = -1; u_opentable.openitem[i].size = 0; } u_opentable.cur_size = 0; cur_dir = root; bufferdir = (char *)malloc(DIR_MAXSIZE*sizeof(char)); strcpy(bufferdir,"lihao:"); } void halt() { FILE *fp; int i; if((fp=fopen("lihao.dat","wb"))==NULL) { printf("Error:\nCannot open file\n"); return; } if(!fwrite(flihao,MEM_D_SIZE,1,fp)) { printf("Error:\nFile write error!\n"); } fclose(fp); free(flihao); free(bufferdir); return; } int mkdir(char *name) { int i,j; struct direct *cur_mkdir; if(!strcmp(name,".")) return(-4); if(!strcmp(name,"..")) return(-4); if(strlen(name)>8) return(-1); for(i=2;i<MSD+2;i++) { if(cur_dir->directitem[i].firstlihao==-1) break; } if(i>=MSD+2)//目录/文件已满 return(-2); for(j=2;j<MSD+2;j++)//判断是否有重名 { if(!strcmp(cur_dir->directitem[j].name,name)) break; } if(j<MSD+2)//如果有重名 return(-3); for(j=ROOT_lihao_NO+1;j<lihao_NUM;j++) { if(fat[j].em_lihao=='0') break; } if(j>=lihao_NUM) return(-5); fat[j].em_lihao='1'; //填写目录项 strcpy(cur_dir->directitem[i].name,name); cur_dir->directitem[i].firstlihao=j; cur_dir->directitem[i].size=ROOT_lihao_SIZE; cur_dir->directitem[i].next=j; cur_dir->directitem[i].property='1'; cur_mkdir=(struct direct *)(flihao+cur_dir->directitem[i].firstlihao*lihaoSIZE); //初始化目录 cur_mkdir->directitem[0].sign=0; cur_mkdir->directitem[0].firstlihao=cur_dir->directitem[i].firstlihao; strcpy(cur_mkdir->directitem[0].name,"."); cur_mkdir->directitem[0].next=cur_mkdir->directitem[0].firstlihao; cur_mkdir->directitem[0].property='1'; cur_mkdir->directitem[0].size=ROOT_lihao_SIZE; //指向上一级目录的目录项 cur_mkdir->directitem[1].sign=cur_dir->directitem[0].sign; cur_mkdir->directitem[1].firstlihao=cur_dir->directitem[0].firstlihao; strcpy(cur_mkdir->directitem[1].name,".."); cur_mkdir->directitem[1].next=cur_mkdir->directitem[1].firstlihao; cur_mkdir->directitem[1].property='1'; cur_mkdir->directitem[1].size=ROOT_lihao_SIZE; for(i=2;i<MSD+2;i++) { cur_mkdir->directitem[i].sign=0; cur_mkdir->directitem[i].firstlihao=-1; strcpy(cur_mkdir->directitem[i].name,""); cur_mkdir->directitem[i].next=-1; cur_mkdir->directitem[i].property='0'; cur_mkdir->directitem[i].size=0; } return 0; } int cd(char *name) { int i,j,item; char *str; char *temp,*point,*point1; struct direct *temp_dir; temp_dir=cur_dir; str=name; if(!strcmp("\\",name)) { cur_dir = root; strcpy(bufferdir,"Root:"); return 0; } temp = (char *)malloc(DIR_MAXSIZE*sizeof(char)); for(i=0;i<(int)strlen(str);i++) temp[i]=str[i]; temp[i]='\0'; for(j=0;j<MSD+2;j++) { if(!strcmp(temp_dir->directitem[j].name,temp)) break; } free(temp); if(j>=MSD+2) return(-1); item=temp_dir->directitem[j].firstlihao; temp_dir=(struct direct *)(flihao+item*lihaoSIZE); if(!strcmp("..",name)) { if(cur_dir->directitem[j-1].sign!=1) { point=strchr(bufferdir,'\\'); while(point!=NULL) { point1=point+1; point=strchr(point1,'\\'); } *(point1-1)='\0'; } } else { bufferdir = strcat(bufferdir,"\\"); bufferdir = strcat(bufferdir,name); } cur_dir=temp_dir; return 0; } int rmdir(char *name) { int i,j,item; struct direct *temp_dir; //检查当前目录项中有无该目录 for(i=2;i<MSD+2;i++) { if(!strcmp(cur_dir->directitem[i].name,name)) break; }