[bits 64]

section .text
global _start

_start:

; set stdin non blocking
mov rax, 72 ; fcntl
mov rdi, 0 ; stdin
mov rsi, 3 ; F_GETFL
mov rdx, 0
syscall
mov rdx, rax
or rdx, 4 ; O_NONBLOCK
mov rax, 72 ; fcntl
mov rdi, 0 ; stdin
mov rsi, 4 ; F_SETFL
syscall

mov rax, 228 ; clock_gettime
mov rdi, 0 ; CLOCK_REALTIME
mov rsi, ts_start
syscall


print_time:

mov rax, 228 ; clock_gettime
mov rdi, 0 ; CLOCK_REALTIME
mov rsi, ts_cur
syscall

mov rax, [tv_cur_s]
mov rbx, [tv_start_s]
sub rax, rbx
fifoo:
add al, 0x30
mov byte [msg], al
;xor rax, rax
;mov al, byte [msg]
;mov rdi, [tv_cur_s]
;mov rdx, [tv_start_s]
;sub rdi, rdx
;fifoo:
;add rax, rdi
;mov byte [msg], al

mov rax, 1
mov rdi, 1
mov rsi, msg
mov rdx, msglen
syscall

sleep:
mov rax, 35
mov rdi, ts_sleep
mov rsi, 0
syscall
jmp print_time

mov rax, 60            ; sys_exit
mov rdi, 0             ; 0
syscall

dumprax:
	push rax
	loopdump:
		push rax
		mov rbx, rax
		and rbx, 0x0F
		cmp bl, 0xA
		jge hexdigit
		add bl, 0x30
		jmp loopcont
		hexdigit:
		sub bl, 10
		add bl, 0x41
		loopcont:
dbg:
		mov byte [digit], bl
		mov rax, 1
		mov rdi, 1
		mov rsi, digit
		mov rdx, 1
		syscall
	pop rax
	mov rdi, 10
	xor rdx, rdx
	mov rsi, rax
	div rdi
	cmp rax, 10
	jge loopdump

	mov al, 10
	mov al, [digit]
	mov rax, 1
	mov rdi, 1
	mov rsi, nl
	mov rdx, 1
	syscall

	pop rax
ret

section .data
foobar: ISTRUC timespec
ts_start:
	tv_start_s dq 0
	tv_start_us dq 0


msg:	db "0 Hello, world!", 10
msglen: equ $ - msg

digit: db "0"
nl: db 10

ts_cur:
	tv_cur_s dq 0
	tv_cur_us dq 0

;ts_sleep:
;	tv_sleep_s dd 0,0
;	tv_sleep_us dd 10000000,0 


; 1/2s sleep
ts_sleep:
	tv_sleep_s dq 0
	tv_sleep_us dq 500000000


.end: