From 523322dc13a2599014e26780518bf06277a57e30 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 29 Nov 2017 11:34:58 -0500
Subject: add print[i,h] and normalize load addresses

---
 stdio.asm | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 88 insertions(+), 1 deletion(-)

(limited to 'stdio.asm')

diff --git a/stdio.asm b/stdio.asm
index e6f7290..2e61afc 100644
--- a/stdio.asm
+++ b/stdio.asm
@@ -17,7 +17,7 @@ puts:
 	lodsb			; load byte at [si] into al
 	or al, 0		; 0 | 0 = 0 (detect null terminator)
 	je .end
-	int 10h			; BIOS video service
+	call putc
 	jmp .loop
 .end:
 	popa
@@ -25,4 +25,91 @@ puts:
 	pop bp
 	ret
 
+
+printi:
+    push bp
+    mov bp, sp
+
+    mov ax, [bp + 4]    ; integer WORD
+    mov cx, 0          ; counter
+    cmp ax, 0
+    je .write_no_pop
+
+.divide:
+    xor dx, dx
+    mov di, 10          ; divisor
+    div di
+
+    push dx
+    inc cx
+    cmp ax, 0
+    jne .divide
+
+    jmp .write
+
+.write_no_pop:
+    or al, 30h
+    call putc
+    jmp .return
+
+.write:
+    pop ax
+
+    or al, 30h
+    call putc
+    dec cx
+    jne .write
+
+.return:
+    mov sp, bp
+    pop bp
+    ret
+
+printh:
+    push bp
+    mov bp, sp
+
+    mov ax, [bp + 4]    ; integer WORD
+    mov cx, 0          ; counter
+    cmp ax, 0
+    je .write_no_pop
+
+.divide:
+    xor dx, dx
+    mov di, 16          ; divisor
+    div di
+
+    push dx
+    inc cx
+    cmp ax, 0
+    jne .divide
+
+    jmp .write
+
+.write_no_pop:
+    or al, 30h
+    call putc
+    jmp .return
+
+.write:
+    pop ax
+    cmp al, 10
+    jge .alpha
+
+    or al, 30h
+    jmp .decimal
+
+.alpha:
+    sub al, 10
+    add al, 'A'
+
+.decimal:
+    call putc
+    dec cx
+    jne .write
+
+.return:
+    mov sp, bp
+    pop bp
+    ret
 %endif
-- 
cgit