assembly/numtoasc.asm

SYS_EXIT equ 1
SYS_READ equ 3
SYS_WRITE equ 4
STDIN equ 0
STDOUT equ 1
SYS_IOCTL equ 54

section .bss
	sz RESB 4 ; 4 byte for window size
	num resb 4 ;4 byte for ascii numbers

section .data
	ha db 0 ;hundreds
	ta db 0 ;tens

section .text
	global _start

_start:

	; print rows

	mov ecx, '7' 		;rows in ecx

hundreds:
	mov ebx, 100
	cmp ecx, ebx		;check if above 100
	js bla
	jae inchundred		;jump to increment hundreds if needed
	

bla:
	mov eax,[ha]		;hundred count to eax
	add eax, '0'		;convert to ascii
	mov [num+0], eax	;move to first byte of num string

tens:
	cmp ecx, 0xa		;check if above 10
	jge inctens		;jump to increment tens if needed
	
	mov eax,[ta]
	add eax, '0'
	mov [num+1], eax

	mov eax, ecx
	add eax, '0'
	mov [num+2], eax	
	mov [num+3], byte 0xa 	;linebreak

	mov eax, SYS_WRITE
	mov ebx, STDOUT
	mov ecx, num
	mov edx, 4
	int 0x80


	;print hundreds
	;mov eax, [ha]
	;add eax, '0'
	;mov[ha], eax
	
	;mov eax, SYS_WRITE
	;mov ebx, STDOUT
	;mov ecx, ha
	;mov edx, 1
	;int 0x80	

	; print cols

	;mov eax, SYS_WRITE
	;mov ebx, STDOUT
	;mov ecx, sz+2
	;mov edx, 3
	;int 0x80

exit:
	;exit
	mov eax, 1
	mov ebx, 0
	int 0x80

inchundred:
	inc byte [ha]		;increment hundreds
	sub ecx, 0x64
	jmp hundreds

inctens:
	inc byte [ta]		;increment tens
	sub ecx, 0xa
	jmp tens