;NAME:- Chinmay M. Mule
;CLASS:-SE COMP II SHIFT
;ROLLNO:-34 PRN:-S18111044
;  Assignment Name:- Write X86 program to sort the list of integers in 
;                    ascending order.
;                    Read the input from the text file and write the sorted    
;                    data back to the same text file using bubble sort.
                     
                         

%include "macro.asm"

section .data

nline db 10
nline_len equ $-nline

ano db 10,10,10,10,"MPL assignment 07-Bubble sort using file operations"
db 10,"........................................",10
ano_len equ $-ano

filemsg db 10,"Enter filename of input data:"
filemsg_len equ $-filemsg

omsg db 10,"Sorting using bubble sort operation successful."
  db 10,"Output stored in same file.....",10,10
omsg_len equ $-omsg

errmsg db 10,"ERROR in opening/reading/writing file..",10
errmsg_len equ $-errmsg

exitmsg db 10,10,"Exit from program....",10,10
exitmsg_len equ $-exitmsg

section .bss

buf resb 1024
buf_len equ $-buf ;buffer length

filename resb 50

filehandle resq 1
abuf_len resq 1 ;actual buffer length

array resb 10
n resq 1   ;passes

section .text

global _start

_start:
print ano,ano_len

print filemsg,filemsg_len
read filename,50
dec rax
mov byte[filename+rax],0 ; blank char/null char 

fopen filename ;on success returns handle
cmp rax,-1H
je Error
mov[filehandle],rax

fread[filehandle],buf,buf_len
dec rax
mov [abuf_len],rax

call bsort
jmp Exit

Error:print errmsg,errmsg_len

Exit:print exitmsg,exitmsg_len
 exit
 ;........................................................................
 bsort:       ;Bubble sort procedure
  call buf_array
  
  xor rax,rax
  mov rbp,[n]
  dec rbp
  
  xor rcx,rcx
  xor rdx,rdx
  xor rsi,rsi
  xor rdi,rdi
  
  mov rcx,0 ;i=0
  
  oloop:mov rbx,0 ;j=0
  
  mov rsi,array  ;a[j]
  
 iloop:mov rdi,rsi ;a[j+1]
 inc rdi
 
 mov al,[rsi]
 cmp al,[rdi]
 jbe next
 
 mov dl,0
 mov dl,[rdi] ;swap
 mov [rdi],al
 mov [rsi],dl
 
 next:inc rsi
   inc rbx ; j++
   cmp rbx,rbp
   jb iloop
   inc rcx
   cmp rcx,rbp
   jb oloop
   
   fwrite [filehandle],omsg,omsg_len
   fwrite [filehandle],array,[n]
   
   fclose [filehandle]
   
   print omsg,omsg_len
   print array,[n]
   
   ret
   
   Error1:
    print errmsg,errmsg_len
    ret
   ;....................................................
   buf_array:
   xor rcx,rcx
   xor rsi,rsi
   xor rdi,rdi
   
   mov rcx,[abuf_len]
   mov rsi,buf
   mov rdi,array
   
   next_num:
    mov al,[rsi]
    mov [rdi],al
    
    inc rsi ;number
    inc rsi ;newline
    inc rdi
    
    inc byte[n] ; counter
    
    dec rcx
    dec rcx
    jnz next_num
    ret
    
    
;  OUTPUT:-
;chinmay@ubuntu:~Desktop/MPL Programs/Assignment7$ nasm -f elf64 bsort.asm
;chinmay@ubuntu:~Desktop/MPL Programs/Assignment7$ ld -o b bsort.o
;chinmay@ubuntu:~Desktop/MPL Programs/Assignment7$ ./b




;MPL assignment 07-Bubble sort using file operations
;........................................

;Enter filename of input data:fl.txt

;Sorting using bubble sort operation successful.
;Output stored in same file.....

;12467

;Exit from program....