.lcomm ch 1
.global _start
.text
_start:
    movl $1,%edx
    movl $ch,%ecx
    pushl %edx
    pushl %ecx
    movl $0,%ebx
    movl $3,%eax
    int  $0x80
    popl %ecx
    popl %edx
    cmpl $0,%eax
    jz   done
    cmpb $'\n',ch
    jz   _start
    movl $1,%ebx
    movl $4,%eax
    int  $0x80
    jmp  _start
done:
    movl $1,%eax
    movl $0,%ebx
    int  $0x80