section .data
    prompt1   db "Введите первое число: ", 0
    prompt2   db "Введите второе число: ", 0
    result    db "Результат: ", 0
    newline   db 0xA, 0xD, 0
    buffer    times 32 db 0
    N         equ 4
 
section .bss
    num1      resd 1
    num2      resd 1
    sum       resd 1
 
section .text
    global _start
 
; Процедура ввода числа (возвращает в EAX)
input_number:
    push ebx
    push ecx
    push edx
    push esi
    push edi
 
    ; Вывод приглашения
    mov eax, 4
    mov ebx, 1
    mov edx, 21
    int 0x80
 
    ; Ввод строки
    mov eax, 3
    mov ebx, 0
    mov ecx, buffer
    mov edx, 32
    int 0x80
 
    ; Преобразование строки в число
    mov esi, buffer
    xor eax, eax          ; аккумулятор = 0
    xor ebx, ebx          ; для хранения текущей цифры
    mov ecx, 10           ; множитель
    xor edi, edi          ; флаг знака
 
    ; Пропуск пробелов
.skip_spaces:
    mov bl, [esi]
    cmp bl, ' '
    jne .check_sign
    inc esi
    jmp .skip_spaces
 
.check_sign:
    cmp byte [esi], '-'
    jne .check_plus
    inc edi
    inc esi
    jmp .parse_loop
 
.check_plus:
    cmp byte [esi], '+'
    jne .parse_loop
    inc esi
 
.parse_loop:
    mov bl, [esi]
    cmp bl, 0xA
    je .finish
    cmp bl, 0xD
    je .finish
    cmp bl, '0'
    jb .error
    cmp bl, '9'
    ja .error
 
    sub bl, '0'
 
    ; Умножение eax на 10 (без использования imul)
    push ebx
    mov ebx, eax
    shl eax, 1       ; eax * 2
    lea eax, [eax + ebx*8]  ; eax = eax*2 + ebx*8 = (eax)*10
    pop ebx
 
    add eax, ebx     ; добавить новую цифру
    inc esi
    jmp .parse_loop
 
.error:
    ; Если встретили не цифру, просто завершаем
    jmp .finish
 
.finish:
    test edi, edi
    jz .done
    neg eax
 
.done:
    pop edi
    pop esi
    pop edx
    pop ecx
    pop ebx
    ret
 
; Процедура вывода числа из EAX
output_number:
    push eax
    push ebx
    push ecx
    push edx
    push esi
    push edi
 
    mov edi, buffer + 31
    mov byte [edi], 0
    dec edi
    mov byte [edi], 0xA
    dec edi
 
    mov ecx, 10
    test eax, eax
    jns .positive
 
    ; Отрицательное число
    neg eax
    mov byte [edi], '-'
    dec edi
 
.positive:
    ; Специальная обработка для 0
    test eax, eax
    jnz .convert_loop
    mov byte [edi], '0'
    dec edi
    jmp .output
 
.convert_loop:
    xor edx, edx
    div ecx
    add dl, '0'
    mov [edi], dl
    dec edi
    test eax, eax
    jnz .convert_loop
 
.output:
    inc edi
    mov ecx, edi
    mov edx, buffer + 32
    sub edx, edi
 
    mov eax, 4
    mov ebx, 1
    int 0x80
 
    pop edi
    pop esi
    pop edx
    pop ecx
    pop ebx
    pop eax
    ret
 
_start:
    ; Ввод первого числа
    call input_number
    mov [num1], eax
 
    ; Ввод второго числа
    call input_number
    mov [num2], eax
 
    ; Сложение чисел
    mov eax, [num1]
    add eax, [num2]
    mov [sum], eax
 
    ; Вывод результата
    mov ecx, result
    mov edx, 11
    mov eax, 4
    mov ebx, 1
    int 0x80
 
    mov eax, [sum]
    call output_number
 
    ; Вывод новой строки
    mov ecx, newline
    mov edx, 2
    mov eax, 4
    mov ebx, 1
    int 0x80
 
    ; Завершение программы
    mov eax, 1
    xor ebx, ebx
    int 0x80

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