extern	gets
extern	writef
extern	hextostr		
extern  printf

%macro	check_error	0
	cmp	rax, 0
	jnz	error
%endmacro
section .data
	outfile	db	'out',0
	errstr	db	'Input error! 16-bit HEX-number expected!',10,0
	errsz	dw	$-errstr

section .text
global main 
main:
	push    rbp
	mov     rbp, rsp

	push	source
	push	buffer
	call	gets	
	check_error
	
	mov	rsi,[source]
	push	rsi	
	push	result
	call	hextostr	
	check_error

	push	outfile
	push	result
	call	writef
	check_error

	mov	rbx, 0
	jmp	stop

error:
	mov	rax, 4
	mov	rbx, 1
	mov	rcx, errstr
	mov	rdx, [errsz]
	int	0x80
	mov	rbx, 1

stop:	mov	rax, 1	
	int	0x80

section .data
source		dw	0	
result		db	'0000'	
buffer		db	'0000'