;------------------------------------------
; int slen(String message)
; String length calculation function
slen:
push    ebx
mov     ebx, eax

nextchar:
cmp     byte [eax], 0
jz      finished
inc     eax
jmp     nextchar

finished:
sub     eax, ebx
pop     ebx
ret



;------------------------------------------
; void sprint(String message)
; String printing function
sprint:
push    edx
push    ecx
push    ebx
push    eax
call    slen

mov     edx, eax
pop     eax

mov     ecx, eax
mov     ebx, 1
mov     eax, 4
int     80h

pop     ebx
pop     ecx
pop     edx
ret



;------------------------------------------
; void sprintLF(String message)
; String printing with line feed function
sprintLF:
call    sprint

push    eax
mov     eax, 0Ah
push    eax

mov     eax, esp
call    sprint
pop     eax
pop eax
ret



;------------------------------------------
; void exit()
; Exit program and restore resources
quit:
mov     ebx, 0
mov     eax, 1
int     80h
ret