segment .note.GNU-stack

extern ft_strcpy
extern ft_strlen
extern malloc

section .text
	global ft_strdup

ft_strdup:
	push    rbx								; save rbx
	cmp     rdi, 0							; check s is NULL
	je      .exit							; exit (with restore of rbx) if true
	mov     rbx, rdi						; save rdi value in rbx
	call    ft_strlen						; call ft_strlen on rdi
	lea     rdi, [rax + 1]					; calculation of the malloc size
	call    malloc							; malloc is called return value on rax
	test    rax, rax						; check the return value of malloc
	je      .exit							; exit (with restore of rbx) if true
	mov     rdi, rax						; set the dest string (for ft_strcpy)
	mov     rsi, rbx						; set the source string (for ft_strcpy)
	pop     rbx								; restore rbx
	jmp     ft_strcpy						; call ft_strcpy

.exit:
	pop     rbx								; restore rbx
	ret										; return rax (NULL)