EXIT_NR  = 1
READ_NR  = 3
WRITE_NR = 4
STDOUT = 1
STDIN = 0
EXIT_CODE_SUCCESS = 0

input_len=512
output_len=1

.global _start

.data
space: .byte ' ;

.bss
.comm input, 512
.comm output_high, 1
.comm output_low, 1


.text

_start:

mov $READ_NR, %eax
mov $STDIN, %ebx
mov $input, %ecx
mov $input_len, %edx
int $0x80

mov %eax,%edi
//sub $1,%edi
mov $0,%esi

loop:

mov input(%esi),%ah
mov input(%esi),%al

shrb $4,%ah
addb $0x30,%ah
movb %ah, output_high

andb $0x0F,%al

cmpb $0x0A, %al
jge wieksze_od_10

addb $0x30,%al
jmp po

wieksze_od_10:
addb $0x37,%al

po:

movb %al, output_low

mov $WRITE_NR, %eax
mov $STDOUT, %ebx
mov $output_high, %ecx
mov $output_len, %edx
int $0x80

mov $WRITE_NR, %eax
mov $STDOUT, %ebx
mov $output_low, %ecx
mov $output_len, %edx
int $0x80

mov $WRITE_NR, %eax
mov $STDOUT, %ebx
mov $space, %ecx
mov $output_len, %edx
int $0x80

inc %esi

cmp %esi,%edi
jne loop


mov $EXIT_NR          , %eax
mov $EXIT_CODE_SUCCESS, %ebx
int $0x80