Print sign in assembly

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I am working on an Operating System. I create a print function in assembly for this. When i try to print '----' with this. it does not work. My code is available on this url: ThunderEagle/printf.asm at master · Sansoft500/ThunderEagle · GitHub[^]

please help me to solve

What I have tried:

The url is shown before is the only but when i use

mov al,'-'
int 10h
int 10h
int 10h

it works. how i use this with my function?

[EDIT by Jochen Arndt: Inserted code from GitHub]

printf:
	mov ah,0x0e
	mov bh,0x00
	mov bl,0x07
	next:
		mov al,[si]
		or al,al
		jz done
		int 0x10
		inc si
		jmp next
	done:
		ret

[EDIT]

Posted 13-Mar-17 1:26am

Member 12935107

Updated 13-Mar-17 1:48am

Jochen Arndt

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Kornfeld Eliyahu Peter · Answer 1 · 2017-03-13T01:37:00

Solution 1

To print a character using BIOS interrupt 10h, you first have to set the function in AH...

C++

mov ah, 0x0e
mov al, '-'
int 0x10

If you wish us to examine your code, please paste it in to your question instead of adding a link...

Posted 13-Mar-17 1:37am

Kornfeld Eliyahu Peter

Jochen Arndt · Answer 2 · 2017-03-13T01:46:00

Code from the GitHub URL:

printf:
	mov ah,0x0e
	mov bh,0x00
	mov bl,0x07
	next:
		mov al,[si]
		or al,al
		jz done
		int 0x10
		inc si
		jmp next
	done:
		ret

The above requires that DS:SI is pointing to a null terminated string. So you need something like this:

SECTION .data
minus3: db "---", 0

    SECTION .TEXT

; ...
; DS must be .data which it usually is 
    mov si,minus3
    call printf