_start:
	; get the filename in rdi
	POP rdi					; argc
	cmp rdi, 2				; checking number of arguments
	jne end					; if no 2 arguments - end program
	POP rdi					; argv[0] - name of program
	POP rdi					; argv[1] - file to open

	; open the file
	mov   rax,  2           			; open
	mov   rsi,  0           			; read-only mode
	mov rdx, 0644o						; set flags
	syscall
	cmp RAX, 0							; check if properly opened
	jl ending_code_one					; if not end with code one
	mov [file_descriptor], eax


read_file:
    mov rdi, [file_descriptor]			; save file descriptor
    mov     rax,  0        				; read
    mov     rsi,  buf       			; buffer
    mov     rdx,  [bufsize]   			; size of buffer
    syscall
    cmp rax, 4							; check if 4 bytes read
    je check_number						; if yes procede checking input
	PUSH rax
	; close file
	mov rax, 3
	mov rdi, [file_descriptor]
	syscall
	POP rax
    cmp rax, 0							; end of file
    je check_conditions
	jne ending_code_one					; improper number of bytes read - code one