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make better #2

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17 changes: 7 additions & 10 deletions asm/zero-or-not-zero.asm
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Original file line number Diff line number Diff line change
Expand Up @@ -16,9 +16,6 @@ section .data
notzero: db 'That one is NOTZERO',0xA
notzeroLen: equ $-notzero

; Zero
equal: db 30h,0xA

section .bss
num resb 8

Expand All @@ -39,17 +36,11 @@ section .text
mov eax, 3 ; Syscall: read i guess? i just learned assembly today
int 0x80 ; Kernel interrupt 0x80

; If ecx == 0 setZero else setNotZero
; If ecx == 0 then setZero else setNotZero
cmp byte[ecx], '0' ; Compare character value of user input to ascii char 0
je setZero ; Jump to setZero if equal
jmp setNotZero ; Jump to setNotZero

; Exit the program
exit:
mov ebx, 0 ; Arg 1: status
mov eax, 1 ; Syscall: 1 = exit(3)
int 0x80 ; Kernel interrupt 0x80

; Set edx and ecx registers to print zero message
setZero:
mov edx, zeroLen
Expand All @@ -68,3 +59,9 @@ section .text
mov eax, 4 ; Syscall: 4 = write(2)
int 0x80 ; Kernel interrupt 0x80
call exit ; Exit program

; Exit the program
exit:
mov ebx, 0 ; Arg 1: status
mov eax, 1 ; Syscall: 1 = exit(3)
int 0x80 ; Kernel interrupt 0x80