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  1. ;Assignment No.	: 2
  2. ;Assignment Name: Write X86/64 ALP to accept a string and to display its length.
  3. ;---------------------------------------------------------------------
  4. section    .data
  5.  
  6. 	msg		db	10,10,"Enter the string:	"
  7. 	msg_len	equ	$-msg
  8.  
  9. 	smsg		db	10,10,"The length of string is:	"
  10. 	smsg_len	equ	$-smsg
  11.  
  12. ;---------------------------------------------------------------------
  13. Section   .bss
  14.  
  15.     string resb 50
  16.     stringl equ $-string
  17.     count resb 1
  18. 	char_ans	resb	2
  19. ;---------------------------------------------------------------------
  20. %macro  Print   2
  21. 	mov   rax, 1
  22. 	mov   rdi, 1
  23. 	mov   rsi, %1
  24. 	mov   rdx, %2
  25. 	syscall
  26. %endmacro
  27.  
  28. %macro  Read   2
  29. 	mov   rax, 0
  30. 	mov   rdi, 0
  31. 	mov   rsi, %1
  32. 	mov   rdx, %2
  33. 	syscall
  34. %endmacro
  35.  
  36. %macro	Exit	0
  37. 	mov  rax, 60
  38. 	mov  rdi, 0
  39. 	syscall
  40. %endmacro
  41.  
  42. ;---------------------------------------------------------------------
  43. section    .text
  44. 	global   _start
  45. _start:
  46. 	Print	msg, msg_len
  47. 	Read string, stringl
  48. 	mov [count], rax
  49.  
  50.     Print smsg, smsg_len
  51.     mov rax, [count]
  52.     call Display
  53. 	Exit
  54. ;--------------------------------------------------------------------	
  55. Display:
  56. 	mov 		rbx,16			; divisor=16 for hex
  57. 	mov 		rcx,2			; number of digits 
  58. 	mov 		rsi,char_ans+1		; load last byte address of char_ans buffer in rsi
  59.  
  60. cnt:	mov 		rdx,0			; make rdx=0 (as in div instruction rdx:rax/rbx)
  61. 	div 		rbx
  62.  
  63. 	cmp 		dl, 09h			; check for remainder in rdx
  64. 	jbe  	add30
  65. 	add  	dl, 07h 
  66. add30:
  67. 	add 		dl,30h			; calculate ASCII code
  68. 	mov 		[rsi],dl			; store it in buffer
  69. 	dec 		rsi				; point to one byte back
  70.  
  71. 	dec 		rcx				; decrement count
  72. 	jnz 		cnt				; if not zero repeat
  73.  
  74. 	Print 	char_ans,2		; display result on screen
  75. ret
  76. ;----------------------------------------------------------------
Success #stdin #stdout 0s 5288KB
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stdin
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hello
stdout
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Enter the string:	

The length of string is:	06
https://ideone.com/3h6Rq6
language:
Assembler 64bit (nasm 2.14)
created:
2 days ago
visibility:
public

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