main.cpp

linux文件系统试验 一、实验目的 学习有关linux文件管理程序如何组织的知识

/***************************************************************************
                          main.cpp  -  description
                             -------------------
    begin                : 三  8月  6 21:37:02 EDT 2003
    copyright            : (C) 2003 by Jeremy
    email                : [e-mail]
 ***************************************************************************/

#include "para.h"
#include "function.h"

int main(int argc, char *argv[])
{ 	
 	char char_command[INP_LEN],char_name[INP_LEN],char_big[INP_LEN],char_all[INP_LEN*2],char_ext[INP_LEN];//used to handle the string that you input
	char cur_path[INP_LEN],form_cur_path[INP_LEN];	
	
 	int i=0,k=0;	//log=clu+31
 	char str_empty[INP_LEN];str_empty[0]='\0';
 	for (i=0;i<INP_LEN*2;i++)		char_all[i]='\0';
 		for (i=0;i<INP_LEN;i++)
 			{				char_command[i]='\0';		char_name[i]='\0';	char_ext[i]='\0'; 			}
 	
 	i=0;
 	//strcpy(char_all,"ls");
	log_num=19;
	cout<<endl<<"Welcome!"<<endl<<endl<<"you can use 'ls' to show a file list	"<<endl<<"'cd' entry name' to get into a entry.'cd..' to the upper floor "<<"or"<<" 'cd/' back to the root "<<endl<<"'del filename' to delete a file"<<endl<<endl;
 	strcpy(cur_path,"/floppy");
 	printf("%s>",cur_path);
 	gets(char_all);
 	/*fromn here start the loop of the command*/
 	
	while (strcmp(char_all,"exit\0")!=0)			
 	{
  		i=0;	
  		while ((char_all[i]!='\0')&&(char_all[i]!=32))		//receive char_all and put the command in char_command and the file name in char_name
 		{
 			char_command[i]=char_all[i];
 			i++;
		}
 	
	 	if (char_all[i]==32) //receive the file name
 		{
 			i++;
 			k=0;
 			while ((char_all[i]!='\0')&&(char_all[i]!='.'))
 			{
 					char_name[k]=char_all[i]; 	k++;	i++;
 		   }
 		   k=0;
 		}
 	
 		if (char_all[i]=='.')
 		{
 			i++;
 			while (char_all[i]!='\0')
 			{char_ext[k]=char_all[i];k++;i++;}
 		}
 	
 			 	
 		if (strcmp(char_command,"ls")==0)			//i think this part should rotate for certain times e.g. 16
 			{
 				getdiskinfo();
 				
 				read_index(log_num);							//caution when use void read_index() use a logic cluster number
 				//show_buf(buffer);
 				show_list(head);
 			}
 		
 		if (strcmp(char_command,"cd")==0)
 			{
 				read_index(log_num);								//caution when use void read_cluster() use a logic cluster number
 				struct file_node *p3;
 				p3=find_file(char_name,str_empty);
 				if ((p3!=NULL)&&(p3->isdir==1))		//to be sure it is a folder
 					{
	 						form_clu_num=clu_num;clu_num=p3->start_cluster;
		 					form_log_num=log_num;log_num=clu_num+31;
 							strcpy(form_cur_path,cur_path);
 							strcpy(cur_path,p3->file_name);
 							//cur_head;
 					}	
 				else
 					cout<<"\nwrong entry! No such folder! Please check name"<<endl;
 			
 			}
 			
 		else if (strcmp(char_command,"cd..")==0)
 		{
 			clu_num=form_clu_num;
 			log_num=form_log_num;
 			strcpy(cur_path,form_cur_path);
 		}		
 		
 		else if (strcmp(char_command,"cd/")==0)
 		{
 			clu_num=0;
 			log_num=19;
 			strcpy(cur_path,"floppy");
 		}			
 	
 		else if (strcmp(char_command,"del")==0)
 			{
 				read_index(log_num);								//caution when use void read_cluster() use a logic cluster number
 				if (char_name[0]=='\0')
 					cout<<"waring no file name to delete!"<<endl;
 				else
 					{
 						struct file_node *pf;
 						pf=find_file(char_name,char_ext);
 						del_file(pf->num_cluster,pf->num_index,pf->start_cluster);
 		
 		
 						//part 2
 					}
 			 }
		//else cout<<"wrong command"<<endl;
		
 		for (i=0;i<INP_LEN*2;i++)		char_all[i]='\0';
 		for (i=0;i<INP_LEN;i++)
 			{ 				char_command[i]='\0';		char_name[i]='\0';	char_ext[i]='\0'; 			}
  		 	
  	
  		//log_num=clu_num+31;
  		printf("\n%s>",cur_path);
  		gets(char_all);
  	 }		// end loop while
   	
	return EXIT_SUCCESS;
}