SYSCALL32 = 0x80
EXIT = 1
STDIN = 0
READ = 3
BUF_SIZE = 10

WRITE = 4
STDOUT = 1
.data
BUF: .space BUF_SIZE, 0
.text
.globl _start
_start:
    movl $BUF_SIZE, %edx
    movl $BUF, %ecx
    movl $STDIN, %ebx
    movl $READ, %eax
    int $SYSCALL32
    movl $0, %edi
convert:
    movb BUF(,%edi,1), %bl
    cmpb $'9', %bl
    jg subHex
    sub $'0',%bl
    jmp setValue
subHex:
    sub $'a',%bl
    add $10, %bl
setValue:
    movb %bl, BUF(,%edi,1)
    cmp %eax, %edi
    jge koniec
    inc %edi
    jmp convert
koniec:
    movl $EXIT, %eax
    int $SYSCALL32