%assign STDIN 0
%assign STDOUT 1

; Printing macro
; 1: Address of the content
; 2: Length of the content
; 3: File Descriptor of the output
%macro RFM_PRINT 3
	MOV ECX, %1
	MOV EDX, %2
	MOV EAX, 4
	MOV EBX, %3
	INT 80H
%endmacro

; Reading macro
; 1: File Descriptor of the output
; 2: Pointer to the string
; 3: MaxSize
%macro RFM_READ 3
	mov EAX, 3
	mov EBX, %1
	mov ECX, %2
	mov EDX, %3
	INT 80H
%endmacro

; Exit macro
; 1: Exit Status Code
%macro RFM_EXIT 1
	mov EBX, %1
	mov EAX, 1
	INT 80H
%endmacro

SECTION .data
	fat: equ 12

SECTION .bss
	string : resb 5

SECTION .text
	global _start

_start:

	mov ESI, fat
	inc ESI
	mov EAX, 1
	mov ECX, 1
	LOOP_FATORIAL:
		cmp ECX, ESI
		je END_LOOP_FATORIAL
		mul ECX
		inc ECX
		jmp LOOP_FATORIAL
	END_LOOP_FATORIAL:

	; EAX tem o fatorial

	mov ESI, 10
	mov ECX, 0	; ECX contém o tamanho do número

	NUMBER_TO_STRING:
		cmp EAX, 0
		je END_NUMBER_TO_STRING
		inc ECX
		mov EDX, 0
		div ESI
		add EDX, 48
		push EDX
		jmp NUMBER_TO_STRING
	END_NUMBER_TO_STRING:

	cmp ECX, 0
	jne IF_NOT_ZERO
		inc ECX
	IF_NOT_ZERO:

	mov ESI, ECX

	PRINT_STRING_NUMBER:
		cmp ESI, 0
		je END_PRINT_STRING_NUMBER
		dec ESI
		pop EDX
		mov [string], byte DL
		RFM_PRINT string, 1, STDOUT
		jmp PRINT_STRING_NUMBER
	END_PRINT_STRING_NUMBER:

	RFM_EXIT 0