main.c

模拟linux的ext3文件系统。采用位图法。用一个文件模拟硬盘。实现创建、删除目录、文件。读、写文件

#define MAIN
#include "structure.h"
struct user thisuser={{"Kong"},{"03055078"}};
int login()
{
	u8 str[10];
	printf("\nlocalhost login:");
	scanf("%s",str);
	if(strcmp(str,thisuser.username))
		return 0;
	printf("password:");
	scanf("%s",str);
	if(strcmp(str,thisuser.passwd))
		return 0;
	return 1;
}
void chpsd()
{
	u8 str1[10],str2[10];
	printf("\nInput the old password:");
	scanf("%s",str1);
       while(strcmp(str1,thisuser.passwd))
       {
	       printf("Password is not match!!\n");
	       
        	printf("\nInput the old password:");
		scanf("%s",str1);
       }
       printf("Input the new password:");
       scanf("%s",str1);
       printf("Input again to make sure:");
       scanf("%s",str2);
       while(strcmp(str1,str2))
       {
	       printf("Authencation error!\n");
     
              printf("Input the new password:");
              scanf("%s",str1);
              printf("Input again to make sure:");
              scanf("%s",str2);
       }
       strcpy(thisuser.passwd,str1);
       printf("The password has been changed!\n");
}
void chusr()
{
	u8 str1[10],str2[10];
	printf("\nInput the old user name:");
	scanf("%s",str1);
       while(strcmp(str1,thisuser.username))
       {
	       printf("User name is not match!!\n");
	       
        	printf("\nInput the old user name:");
		scanf("%s",str1);
       }
       printf("Input the new user name:");
       scanf("%s",str1);
       printf("Input again to make sure:");
       scanf("%s",str2);
       while(strcmp(str1,str2))
       {
	       printf("Authencation error!\n");
     
              printf("Input the new user name:");
              scanf("%s",str1);
              printf("Input again to make sure:");
              scanf("%s",str2);
       }
       strcpy(thisuser.username,str1);
       printf("The user name has been changed!\n");
}
void copy_string(u16 len, u8 *name, u8 *string)
{
 u16 i;
 for(i=0;i<len;i++){
            *name++=*string++;
 }
}
int main()
{
 u8 string[MAX_LENGTH]={0,};
 u8 cmd[MAX_LENGTH]={0,};
 u8 path[MAX_LENGTH]={0,};
 u8 name[MAX_LENGTH]={0,};
 u8 *cmdstart,*pathstart,*namestart,*thisname,*endname;
 u8 ch,ch1;
 u16 cmdlen,namelen,pathlen, i,*fd=NULL;
  if(!(init_memory())){
	 printf("Do you want to create new FS?(y/n)\n");
	 ch1=getchar();
	 if(ch1=='y') {
		 init_FS();
		 init_memory();
	 }
	 else return 0;
 }
out:
 while(!login())
 {
	 printf("\nInvalid username or passwd!!\nPay attention to Caps Lock key,the form of letter must be right!\n");
 }
 getchar();
 while(1){
       	for(i=0;i<MAX_LENGTH;i++) { 	string[i]=0;	cmd[i]=0;	path[i]=0;	name[i]=0;}
	cmdlen=0;
	pathlen=0;
	namelen=0;
       	printf("[%s-shell@%s ]# ",thisuser.username,current_path);
       	gets(string);
	if(!(strcmp(string,"exit"))) return 0;
        thisname=string;
	cmdstart=string;
	while((ch=*thisname)!=' '&&(*thisname)!=0){    
	         thisname++;
 	}
 	cmdlen=thisname-cmdstart;
	copy_string(cmdlen,cmd,cmdstart);
 	while((ch=*thisname)==' ')    thisname++;
 	if(ch){  
	 	pathstart=thisname;
         	while((ch=*thisname)) thisname++;
	 	endname=thisname;
		ch=*(thisname-1);
	        if(ch=='/'){
			pathlen=endname-pathstart; 
			copy_string(pathlen,path,pathstart);
		}
		else{
		       while((ch=*thisname)!='/'&&thisname>pathstart)  thisname--;
		       if(ch=='/'){ 
		                pathlen=thisname-pathstart+1;
		                copy_string(pathlen,path,pathstart);
			        namestart=thisname+1;
			        namelen=endname-thisname-1;
			        copy_string(namelen,name,namestart);
		       }
		       else {
			        namestart=thisname;
			        namelen=endname-thisname;
			        copy_string(namelen,name,namestart);
		       }
		}
	}
        //printf("cmd:%s %d\npath:%s %d\nname:%s %d\n",cmd,cmdlen,path,pathlen,name,namelen);
        if(match(cmdlen,cmd,"ls")&&cmdlen>=2){
	 	dir();
 	} 
	else if(match(cmdlen,cmd,"help")&&cmdlen>=4)
	{
		printf("command list:\nls--------List the content of the current directory\n");
		printf("mkdir-----Make a new directory\n");
		printf("rmdir-----Remove a directory\n");
		printf("cd--------Change current directory\n");
		printf("create----Create a file\n");
		printf("open------Open a file\n");
		printf("close-----Close the opened file\n");
		printf("write-----Write into a file\n");
		printf("read------Read from a file\n");
		printf("off-------Login out\n");
		printf("exit------Exit the file system\n");
		printf("chpsd-----Change password\n");
                printf("chusr-----Change user name\n");
		printf("format----Format the FS\n");
		
	}
	else if(match(cmdlen,cmd,"chpsd")&&cmdlen>=5){
		chpsd();
		getchar();
	}
        else if(match(cmdlen,cmd,"chusr")&&cmdlen>=5){
		chusr();
		getchar();
	}		
	else if(match(cmdlen,cmd,"off")&&cmdlen>=3){
		goto out;
	}
				
 	else if(match(cmdlen,cmd,"mkdir")&&cmdlen>=5){
	 	mkdir(path,name);
 	}
 	else if(match(cmdlen,cmd,"rmdir")&&cmdlen>=5){
	 	rmdir(path,name);
 	}
 	else if(match(cmdlen,cmd,"cd")&&cmdlen>=2){  
        	cd(path);
 	}
        else if(match(cmdlen,cmd,"create")&&cmdlen>=6){ 
	 	create(path,name);
 	}
 	else if(match(cmdlen,cmd,"delete")&&cmdlen>=6){ 
	 	delete(path,name);
 	}
 	else if(match(cmdlen,cmd,"open")&&cmdlen>=4){ 
	 	fd=open(path,name);
 	}
 	else if(match(cmdlen,cmd,"close")&&cmdlen>=5){
	 	close(fd);
		fd=NULL;
 	}
	else if(match(cmdlen,cmd,"write")&&cmdlen>=5){ 
	 	write(fd,path,name);
 	}
 	else if(match(cmdlen,cmd,"read")&&cmdlen>=4){ 
	 	read(fd);
 	}
 	
 	else if(match(cmdlen,cmd,"format")&&cmdlen>=6){
                 printf("Format will clear all the content of the file system,are you sure?(y/n)\n");
	         ch1=getchar();
	         if(ch1=='y') {
		 init_FS();
		 init_memory();
	        }
             getchar();	 	
 	}
        else printf("Bad command!!\n");
 } 
 return 1;
}