%define STDOUT 1
%define STDERR 2

%define SYS_READ 0
%define SYS_WRITE 1
%define SYS_OPEN 2
%define SYS_CLOSE 3
%define SYS_EXIT 60

%define O_RDONLY 0

section .bss
    buf resb 4096

section .data
    file_err_m db "file error", 10, 0
    args_err_m db "args error", 10, 0

section .text
global _start

_start:
    ; так ну для начала надо бы понять сколько у нас аргументов
    mov rbx, [rsp]
    cmp rbx, 1
    je .prep_narg
    cmp rbx, 2
    jne args_err
    jmp .prep
.prep_narg:
    xor r12, r12
    jmp .loop
.prep:
    mov rax, SYS_OPEN
    mov rdi, [rsp + 16]; argv[1]
    mov rsi, O_RDONLY
    xor rdx, rdx
    syscall
    js file_err

    mov r12, rax
.loop:
    mov rax, SYS_READ
    mov rdi, r12
    mov rsi, buf
    mov rdx, 4096
    syscall

    test rax, rax
    jz .done

    mov rdx, rax
    mov rax, SYS_WRITE
    mov rdi, STDOUT
    mov rsi, buf
    syscall
    jmp .loop
.done:
    mov rax, SYS_CLOSE
    mov rdi, r12
    syscall
    jmp exit

file_err:
    mov rax, SYS_WRITE
    mov rdi, STDERR
    mov rsi, file_err_m
    mov rdx, 12
    syscall

    jmp exit_err

args_err:
    mov rax, SYS_WRITE
    mov rdi, STDERR
    mov rsi, args_err_m
    mov edx, 12
    syscall

    jmp exit_err

exit_err:
    mov rax, SYS_EXIT
    mov rdi, 1
    syscall

exit:
    mov rax, SYS_EXIT
    mov rdi, 0
    syscall