this.cpp

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							return 101;
						}
						else
						{
							fi.Insert(input1,-1+old_current++);
							if(strlen(input1)==0)
							{
								strcpy(input1,input2);
							}
							else
							{
								printf("  ");
								gets(input1);
							}
						}
					}
					else
					{
						fi.Insert(input1,-1+old_current++);
						if(strlen(input1)==0)
						{
							strcpy(input1,input2);
						}
						else
						{
							printf("  ");
							gets(input1);
						}
					}
				}
				else
				{
					fi.Insert(input1,-1+old_current++);
					if(strlen(input1)==0)
					{
						strcpy(input1,input2);
					}
					else
					{
						printf("  ");
						gets(input1);
					}
				}
			} //front lines inserted successfully
		}
	case 202://ib #
		{
			char *input1=new char[_max_input];
			char *input2=new char[_max_input];
			long lnum=0;
			lnum=atol(charpointer[1]);
			if(lnum==0||lnum>fi.SumLNow()){return -1;}//
			long old_current=lnum,new_current=0;
			
			printf("  ");
			gets(input1);
			while(1)
			{
				if(strlen(input1)==0)
				{
					printf("  ");
					gets(input2);
					if(strlen(input2)==0)
					{
						if(getch()==13)
						{
							new_current=fi.current;
							fi.Print(old_current,1);						
							delete input1;
							delete input2;
							fi.current=new_current;
							_file_modified=1;						
							return 101;
						}
						else
						{
							fi.Insert(input1,-1+lnum++);
							if(strlen(input1)==0)
							{
								strcpy(input1,input2);
							}
							else
							{
								printf("  ");
								gets(input1);
							}
						}
					}
					else
					{
						fi.Insert(input1,-1+lnum++);
						if(strlen(input1)==0)
						{
							strcpy(input1,input2);
						}
						else
						{
							printf("  ");
							gets(input1);
						}
					}
				}
				else
				{
					fi.Insert(input1,-1+lnum++);
					if(strlen(input1)==0)
					{
						strcpy(input1,input2);
					}
					else
					{
						printf("  ");
						gets(input1);
					}
				}				
			}//front lines inserted successfully
		}
	case 301://a
		{
			char *input=new char[_max_input];
			long old_current=fi.SumLNow();
			if(fi.SumLNow()==0)
				old_current=1;
			while(1)
			{
				printf("  ");
				gets(input);
				if(strlen(input)==0)
				{
					if(getch()==13)
					{
						fi.Print(old_current,1);
						delete input;
						fi.current=fi.SumLNow();
						_file_modified=1;
						return 301;
					}
				}
				else
				{
					fi.Append(input);
				}
			}
		}
	 case 401://l
		 {
			 fi.Print(fi.current,1);
			 if(fi.SumLNow()<1)
				 printf(".........file is empty........\n");
			 return 401;// lines referred listed
		 }
	 case 402://l #
		 {
			 long lnum1=0;
			 lnum1=atol(charpointer[1]);
			 if(lnum1<=0||lnum1>fi.SumLNow()){return -3;}//
			 if(lnum1>0&&lnum1<=fi.SumLNow())
			 {
				 fi.Print(lnum1,1);
			 }
			 if(fi.SumLNow()<1)
				 printf(".........file is empty........\n");
			 
			 return 401;
		 }
	 case 501://ln
		 {
			 fi.Print(fi.current,0);
			 if(fi.SumLNow()<1)
				 printf(".........file is empty........\n");
			 
			 return 501;// list without line number
		 }
	 case 502://ln #
		 {
			 long lnum1=0;
			 lnum1=atol(charpointer[1]);
			 if(lnum1<=0||lnum1>fi.SumLNow()){return -3;}//
			 if(lnum1>0&&lnum1<=fi.SumLNow())
			 {
				 fi.Print(lnum1,0);
			 }
			 if(fi.SumLNow()<1)
				 printf(".........file is empty........\n");
			 
			 return 502;
		 }
	 case 601://d
		 {//
			 
			 fi.DeleteLine(fi.current);
			 long new_current=fi.current;
			 if(fi.current<1)
			 {
				 printf(".........file is empty........\n");
				 return -1;
			 }
			 if(fi.SumLNow()<1)
			 {				 			 
				 fi.current=0;
			 }
			 fi.Print(fi.current,1);
			 if(fi.SumLNow()!=0)
				 fi.current=new_current;
			 else
				 fi.current=0;
			 _file_modified=1;
			 return 601;
		 }
	 case 602://d #
		 {
			 long lnum=0,new_current=fi.current;
			 lnum=atol(charpointer[1]);
			 if(lnum<=0){return -2;}//
			 if(lnum>fi.SumLNow())
			 {
				 printf("\7........ the line %4d is invalid.........\n",lnum);
				 return -3;
			 }
			 
			 if(lnum>0&&lnum<=fi.SumLNow())
			 {
				 fi.DeleteLine(lnum);
				 new_current=fi.current;
			 }
			 if(fi.current<1)
			 {
				 printf(".........file is empty........\n");
				 return -1;
			 }
			 if(fi.SumLNow()<1)
			 {			
				 fi.current=0;
			 }
			 fi.Print(lnum,1);
			 if(fi.SumLNow()!=0)
				 fi.current=new_current;
			 else
				 fi.current=0;
			 _file_modified=1;
			 return 602;
		 }
	 case 603://d # length
		 {
			 long posi1=0;
			 int length=0;
			 long lnum=0,new_current=fi.current;
			 lnum=atol(charpointer[1]);
			 length=atoi(charpointer[2]);
			 if(length==0){break;}
			 if(lnum<=0||lnum>fi.SumLNow()){return -2;}//
			 if(lnum>0&&lnum<=fi.SumLNow())
			 {
				 if(length>0)
				 {
					 long tempint=fi.SumLNow();
					 for(posi1=lnum;posi1<=((lnum+length-1>tempint)?tempint:lnum+length-1);posi1++)
					 {	
						 fi.DeleteLine(lnum);
					 }
					 if(fi.SumLNow()<1)
					 {
						 printf(".........file is empty........\n");			 
						 fi.current=0;
					 }
					 else
					 {
						 new_current=fi.current;
					 }
					 fi.Print(lnum,1);
					 fi.current=new_current;
					 _file_modified=1;
					 return 603;
				 }
				 if(length<0)
				 {
					 for(posi1=lnum;posi1>=((lnum-length+1<0)?0:lnum+length+1);posi1--)
					 {
						 fi.DeleteLine(posi1);
					 }
					 if(fi.SumLNow()<1)
					 {
						 printf(".........file is empty........\n");			 
						 fi.current=0;
					 }
					 else
					 {
						 new_current=fi.current;
					 }
					 fi.Print(lnum,1);
					 fi.current=new_current;
					 _file_modified=1;
					 return 603;
				 }
			 }
		 }
	 ///find substring form # to #+length-1
	 case 704://f str # length
	     {
			 long posi1=0;
			 long lnum=0;
			 int length=0,_find_str=0;   //sign if there is a line to be found
			 long templnum=0;
			 printf("------------------------------------------------------------------------------\n");
			 lnum=atol(charpointer[2]);
			 length=atoi(charpointer[3]);
			 if(fi.SumLNow()<1)
			 {
				 printf("\7---------------file is empty--------------------\n");
				 return -1;
			 }
			 if(length==0)
			 {
				 printf("\7----------- the line's length is incorrect---------\n");
				 return -1;
			 }
			 if(lnum<=0)// 
			 {
				 lnum=1;
			 }
			 if(lnum>fi.SumLNow())
			 {
				 lnum=fi.SumLNow();
			 }
			 if(lnum>0&&lnum<=fi.SumLNow())
			 {
				 if(length>0)
				 {
					 long tempint=fi.SumLNow();
					 for(posi1=lnum;posi1<=((lnum+length-1>tempint)?tempint:lnum+length-1);posi1++)
					 {
						 templnum=fi.FindStr(charpointer[1],posi1);
						 if(templnum!=-1)
						 {
							 _find_str=1;
							 printf("%4d:",templnum);
							 fi.Display(templnum);
						 }
					 }
					 if(_find_str==0)
					 {
						 printf("---- no proper lines found from line %d to line %d-----\n",lnum,lnum+length-1);
					 }
					 printf("------------------------------------------------------------------------------\n");
					 return 704;
				 }
				 if(length<0)
				 {
					 for(posi1=lnum;posi1>=((lnum-length+1<0)?0:lnum+length+1);posi1--)
					 {
						 templnum=fi.FindStr(charpointer[1],posi1);
						 if(templnum!=-1)
						 {
							 _find_str=1;
							 printf("%4d:",templnum);
							 fi.Display(posi1);
						 }
					 }
					 if(_find_str==0)
					 {
						 printf("---- no proper lines found from line %d to line %d-----\n",lnum,lnum+length-1);
					 }
					 printf("------------------------------------------------------------------------------\n");
					 return 704;
				 }
			 }
		 }
	 case 801://c str1/str2
		 {
			 char *source=new char[_max_input];   //Note : the source string must less than 128
			 char *target=new char[_max_input];
			 int temp=0;
			 int length=0;
			 length=strlen(charpointer[1]);
			 for(temp=0;temp<length;temp++)
			 {
				 if(charpointer[1][temp]=='/')
				 {
					 break;
				 }
			 }
			 if(temp==0)
			 {
				 return -1;
			 }
			 if(temp==length-1)
			 {
				  charpointer[1][temp]='\x0';
				  char *str1=fi.Position(fi.current);
				  fi.Replace(charpointer[1],"");
				  delete str1;
			 }
			 if(temp>0 && temp<length-1)
			 {
				 strcpy(source,charpointer[1]+temp+1);
				 charpointer[1][temp]='\x0';
				 strcpy(target,charpointer[1]);
				 char *str=fi.Position(fi.current);
				 fi.Replace(target,source);
				 delete str;
			 }
			 delete source;
			 delete target;
			 fi.Print(fi.current,1);
			 _file_modified=1;
			 return 802;
		 }
     ///////////////////////////////////////////////////////////////////////////
	 case 804: //c str1/str2 # length
		 {
			 char *source=new char[_max_input];
			 char *target=new char[_max_input];
			 int temp=0,length=0,lenlnum=0;
			 long lnum=atol(charpointer[2]);   //the beginning line to be replaced
			 lenlnum=atoi(charpointer[3]);     //how many line will be replaced
			 if(lnum+lenlnum>fi.SumLNow())
				 lenlnum=fi.SumLNow()-lnum+1;
			 if(lenlnum<1)
				 return -1;
			 length=strlen(charpointer[1]);
			 for(temp=0;temp<length;temp++)
			 {
				 if(charpointer[1][temp]=='/')
				 {
					 break;
				 }
			 }
			 if(temp==0)
			 {
				 return -1;
			 }
			 if(temp==length-1)